
             Appendix C to ZyXEL Elite 2864I User's Manual

                        Quick Reference Guide

                   For Firmware Version 2.03 and Up


  BASIC 'AT' COMMAND SET

  Command             Function & Description                             Ref.

  A/                  Re-execute the last command once.
  A>                  Re-execute the last command once or repeat the
                      last call up to 9 times. (See also S8)
  <any key>           Terminate current connection attempt when enter
                      in handshaking state.
  +++                 Escape sequence code, entered in data state, wait
                      for modem to return to command state.
  ATA                 Go on-line in answer mode. (See also S39b2, S43b6)

  ATBn    Bn          For internal modem: Handshake option              S28b7
          B0      *   Select CCITT V.22 for 1200 bps communication
          B1          Select Bell 212A standard for 1200 bps
  ATBnn               Select ISDN Teleservice                        S82,S102
                      'B' must be followed by two digits.
          B0n         X.75 :
          B00         X.75 Transparent
          B01         X.75 T.70
          B04         BTX (Datex-J)
          B10         V.110 User rate follows DTE speed (async)
                      User rate determined by in-band negotiation (sync)
          B13         V.110 user rate = 2400 bps                         S117
          B14         V.110 user rate = 4800 bps
          B15         V.110 user rate = 9600 bps
          B16         V.110 user rate = 14400 bps
          B17         V.110 user rate = 19200 bps
          B18         V.110 user rate = 38400 bps (async only)
          B20         V.120
          B40         PPP async to sync conversion
          B41         SLIP to sync HDLC conversion
  ATCBn   n=0-1       Configuration of embedded protocol analyzer       S84b1
          CB0         Disable the capture of B channel protocols
          CB1         Enable the capture of B channel protocols
  ATCCn   n=0-1       Configuration of embedded protocol analyzer       S84b0
          CC0         Disable the capture of DTE-DCE interface
                      protocols
          CC1         Enable the capture of DTE-DCE interface
                      protocols
  ATCDn   n=0-1       Configuration of embedded protocol analyzer       S84b2
          CD0         Disable the capture of D channel protocols
          CD1         Enable the capture of D channel protocols
  ATCEn   n=0-1       Call bumping control for PPP/MP and CCB           S85b0
          CE0         Disable the call bumping function
          CE1     *   Enable the call bumping function
  ATCH?               Display the accumulated charging unit of the
                      last call.
  ATCI<prefix>        Prefix number string to be added to the
                      Calling-party-number before indicating to the
                      DTE when the type of number denotes
                      international.
  ATCK<DES_key>       Set the key for DES (Data Encryption Standard)
  ATCLn   n=0-2048    Maximum size of user data in a packet (number
                      of bytes)
  ATCL?               Enquire current setting of ATCLn
  ATCN<prefix>        Prefix number string to be added to the
                      Calling-party-number before indicating to the
                      DTE when the type of number denotes national.
  ATCPn   n=0-1       Loopback 4 control                                S83b0
          CP0         Disable Loopback 4
          CP1         Enable Loopback 4
  ATCRn   n=0-3   *0  Resumes a previoully suspended call, n is the
                      call identifier(Europe)
  ATCSn   n=0-3   *0  Suspend a call, n is the call identifier(Europe)
  ATCT                Clear buffer and start the embedded protocol
                      analyzer. Capture data immediately and start
                      timer.
  ATC$                Invoke the interpretation function of the
                      embedded protocol analyzer and display the
                      results on DTE
  ATDs                Dial s (number and options) that follows (see
                      also S38b0, S35b4). The options of s are listed
                      as follows :
          ,           Pause for a time specified in S6. Remaining
                      digits will be dialed as in-band DTMF.
          W           Wait for second dial tone. Remaining digits
                      will be dialed as in-band DTMF.
                      <ISDN numbering options>
          Y0      *   Unknown type of number
          Y1          International number
          Y2          National number
          Y3          Network specific number
          Y4          Subscriber number
          Y6          Abbreviated number
          Z0      *   Type of subaddress - NSAP with AFI=$50, IA5
                      characters
          Z2          Type of subaddress - user specified, IA5
                      characters
          N0      *   Unknown numbering plan
          N1          ISDN/Telephony numbering plan (CCITT E.164/
                      E.163)
          N3          Data numbering plan (CCITT X.121)
          N8          National standard numbering plan
          N9          Private numbering plan
          /           Called party subaddress delimeters
          A           Don't care (no Called Party Number information
                      element in the output SETUP message/ coming
                      call with any Called Party Number will be
                      granted)
  The format of s will be :
          [[Yn][Nn]called_party_Number][[W][,]]inband_dtmf_number
       or [[Yn][Nn]called_party_Number][/[Zn]called_party_subaddress/]
       or [A][/[Zn]called_party_subaddress/]

  ATDBs               Dial s (number and options) that follows
                      for the a/b adapter
  ATDIs               Dial s (number and options) that follows
                      for ISDN data call
  ATDL                Repeat last ATD command
  ATDMs               Dial s (number and options) that follows
                      for the internal fax/modem
  ATDSn   n=0-39      Dial number stored in NVRAM at location 'n'.      S44b3
  ATEn                Command mode local echo of keyboard commands.     S23b0
          E0          Echo off
          E1 *        Echo on
  ATHn                On/off hook control
          H0 *        Hang up (on-hook) the modem or ISDN, same as 'ATH'
          H3          Hang up the a/b adapter
  ATIn                Display inquired information
          I0          Display product code, same as 'ATI'.
                      Results: 28641           (USA)
                               28642           (DSS1)
                               28643           (1TR6)
          I1          Display product information and ROM checksum
                      Results: Elite 2864I <switch>: V x.xx
                               Internal fax/modem: V x.xx
                               <checksum>
                      where <switch>= USA, DSS1, or 1TR6
          I2          Display link status report of internal fax/modem
          I3          Display link status report of ISDN call
  ATJAn   n=0-255 *48 Add-threshold for PPP/MP Bandwidth-On-Demand      S126
                      in Kbps unit,        
  ATJSn   n=0-255 *32 Sub-threshold for PPP/MP Bandwidth-On-Demand      S127
                      in Kbps unit
  ATKAxn  n=0-63  *0  Add-persist time interval for PPP/MP,          S85b1-7
                      BOD disabled if n=0
                      x= M(in Minute unit) or S(in Second unit)
  ATKSxn  n=0-63  *0  Sub-persist time interval for PPP/MP,         S125b1-7
                      x= M(in Minute unit) or S(in Second unit)
  ATLn    n=0-7  *4   Speaker volume control.The higher the value     S24b4-6
                      ,the higher the volume.
  ATMn                Speaker control.                                S21b1-2
          M0          Speaker always OFF.
          M1  *       Speaker ON until carrier is detected.
          M2          Speaker always ON.
          M3          Speaker ON after the last digit is dialed
                      out and OFF when carrier is detected.
  ATNn    n=0-7  *5   Ring volume control.'N0' will disable           S24b0-2
                      the ring function.
  ATO                 Return to on-line state
  ATO1                Force modem to request a retrain.
  ATPn    n=0-6       D-channel protocol selection(USA)                   S86
                      for American Version
          P0  *       Northern Telecom proprietary ISDN
          P1          National ISDN 1(1 SPID)
          P2          National ISDN 1(2 SPID)
          P3          reserved
          P4          AT&T proprietary point-to-point
          P5          AT&T proprietary point-to-multipoint(1 SPID)
          P6          AT&T proprietary point-to-multipoint(2 SPID)
  ATQn                Result code displayed                             S23b7
          Q0  *       Modem returns result code.
          Q1          Modem does not return result code.
          Q2          Modem returns result code but quiet after         S40b1
                      answering on a RING. (will not show in AT&Vn)
  ATSr.b=n            Set bit 'b' of S-register 'r' to value 'n'.
                      'n' is a binary digit '0' or '1'.
  ATSr.b?             Display value of bit 'b' of S-register 'r'.
  ATSr=n              Set S-register 'r' to value 'n'. 'n' must be a
                      decimal number between 0 and 255.
  ATSr?               Display value stored in S-register 'r'.
  ATSPIDr=nnn...      User enters Service Profile ID nnnn...(USA)
          SPID0       First SPID number
          SPID1       Second SPID Number, if any
  ATSPID?             Display the SPID setting(s)
  ATT                 Repeat last user-to-user information(Europe)
  ATTn<string>        The <string> will be sent to the called party
                      via an User-to-user information element in the
                      next message. Characters other than the alpha-
                      numerical values can be represented by <nnn>
                      in the string, where nnn is the unsigned value
                      of the character. The maximum number of
                      characters in the string is 31 for ETSI.
          T0          User-specific protocol
          T1          OSI high layer protocol
          T2          X.244
          T3          Reserved for system management convergence
                      function
          T4   *      IA5 characters
          T7          ITU-TS Recommendation V.120 rate adaption
          T8          Q.931 user-network call control message
  ATUPX               Download firmware to the Flash EPROM
  ATVn                Verbal/Numeric result codes.                      S23b6
          V0          Display result code in numeric form. (See also
                      S35b7 and the result code table of 'ATXn')
          V1 *        Display result code in verbose form.
  ATXn    n=0-7  *5   Result code options, see the Options Table      S23b3-5
  ATZn    n=0-4       Reset modem and set power-on profile.           S15b5-7
          Zn          Reset modem and load user profile n (0-3).
          Z4          Reset modem and load factory settings.
  AT$                 Basic command summary help


  EXTENDED 'AT&' COMMAND SET
  Command             Function & Description                             Ref.

  &Bn                 Data rate, terminal-to-modem. (DTE/DCE)           S28b6
          &B0         DTE rate follows connection rate.
                      (See also S44b6)
          &B1  *      DTE/DCE rate fixed at DTE setting (See also S18,
                      S20, and S44b6)
  &Cn                 Carrier Detect (CD) options                       S21b4
          &C0         CD always ON (See also S42b7)
          &C1  *      CD tracks presence of carrier.
                      (See also S38b3, S42b7)
  &Dn                 Data Terminal Ready (DTR) options.              S21b6-7
                      (See also S25)
          &D0         Ignore DTR signal, assume DTR is always ON.
          &D1         108.1, DTR OFF-ON transition causes dial of the
                      default number.  (See also 'AT*Dn' and S48b4)
          &D2  *      108.2, Data Terminal Ready, DTR OFF causes the
                      modem to hang up.
          &D3         Same as &D2 but DTR OFF causes the modem to
                      hang up and reset from profile 0.
  &En                 B channel line speed for ISDN data call
          &E0  *      64Kbps
          &E1         56Kbps (Default for American ISDN)
  &F                  Load factory settings to RAM as active
                      configuration.
  &Gn                 Guard tone options (for internal fax/modem)     S28b4-5
          &G0  *      No guard tone (within USA, Canada).
          &G2         1800 Hz guard tone.
  &Hn                 Data flow control, DTE/DCE.                     S27b3-5
          &H0         Flow control disabled.
          &H3  *      Hardware (CTS/RTS) flow control.
          &H4         Software (XON/XOFF) flow control.
  &Jn                 Bundle selection (See also S100)                S87b5-6
          &J0  *      Bundle connection is disabled
          &J1         Bundle connection is enabled in answer
                      mode only
          &J2         Bundle connection is enabled in call
                      mode only
          &J3         Bundle connection is enabled in both
                      directions
  &Kn                 Modem error control and data compression.       S27b0-2
          &K0         No error control.(Same as AT&K)
          &K1         MNP4 (See also S41b0).
          &K2         MNP4+MNP5 (See also S38b5, S41b0).
          &K3         V.42+MNP4.
          &K4  *      V.42+V.42bis, compatible with &K2 (See also S38b5).
  &Knn                ISDN data compression control
                      &K must be followed by two digits
                      V.42bis switch of the ISDN data call              S83b2
          &K00        Disable V.42bis (or disable reliable PPP)
          &K44        Enable V.42b s
  &Ln                 Modem and a/b adaptor address ambiguity           S84b5
                      resolution
          &L0         A/B adaptor first
          &L1         Fax/Modem first
  &Nn                 Modem link mode options (DCE/DCE).                  S19
                      (See also S43b7, S48b1)
          &N0  *      Multi-Auto, auto negotiate highest possible link
                      rate: V.34, ZyX 19200, ZyX16800, V.32bis, V.32,
                      V.22bis, V.22 and Bell 212A, G3 Fax
                      V.17/V.29/V.27ter and cellular modes. (See
                      also S38b4, S43b0, S43b1, S43b3 and S48b5)
          &N1         V.33 14400/12000 (models with 4-wire leased
                      line only).
          &N2         V.33 12000 (models with 4-wire leased line only).
          &N3         V.32 9600T/9600/7200T/4800
          &N4         V.32 9600/7200/4800
          &N5         V.32 4800
          &N6         V.29 9600 (models with 4-wire leased line only).
          &N7         V.29 7200 (models with 4-wire leased line only).
          &N8         V.29 4800 (models with 4-wire leased line only).
          &N9         V.27bis 4800 (models with 4-wire leased line only).
          &N10        V.27bis 2400 (models with 4-wire leased line only)
          &N11        V.26bis 2400 (4-wire leased line or 2-wire
                      half-duplex).(See also S35b2, S39b5)
          &N12        V.23 1200/75 (See also S48b3, S52b7).
          &N13        V.23 600/75 (See also S52b7).
          &N14        V.22bis 2400/1200
          &N15        V.22 1200
          &N16        V.21 300
          &N17        V.32bis 14400/12000/9600/7200/4800
          &N18        V.32bis 12000/9600/7200/4800
          &N19        V.32bis 7200/4800
          &N24        BELL 212A 1200
          &N25        BELL 103 300
          &N32        G3 Fax V.17/V.29/V.27ter
                      14400/12000/9600/7200/4800/2400 (See also S42b4).
          &N34        ZyXEL 19200
          &N35        ZyXEL 16800
          &N36        ZyXEL 14400
          &N37        ZyXEL 12000
          &N38        ZyXEL 9600
          &N39        ZyXEL 7200
          &N42        CELL 14400
          &N43        CELL 12000
          &N44        CELL 9600
          &N45        CELL 7200
          &N46        CELL 4800T
          &N62        V.34 28800
          &N63        V.34 26400
          &N64        V.34 24000
          &N65        V.34 21600
          &N66        V.34 19200
          &N67        V.34 16800
          &N68        V.34 14400
          &N69        V.34 12000
          &N70        V.34 9600
          &N71        V.34 7200
          &N72        V.34 4800
          &N73        V.34 2400
  &On                 Set default call type for conventional dialing  S83b4-5
                      commands
          &O0         ATDs, ATDPs, and ATDTs default to make fax/modem
                      calls
          &O2         ATDs, ATDPs, and ATDTs default to make ISDN
                      data calls
          &O3         ATDs, ATDPs, and ATDTs default to make calls
                      for the a/b adapter
  &Sn                 Data Set Ready (DSR) function selection.          S21b3
          &S0  *      DSR overridden, DSR always ON.
          &S1         DSR according to CCITT (ITU-TSS).
                      (See also S41b5, S44b4)
  &Tn                 Modem testing.
          &T0         Terminate test  in progress.
          &T1         Initiate Analog LoopBack (ALB) test.
          &T8         Initiate Analog LoopBack with self test (ALB+ST)
          &T9         Initiate ISDN loopback test
          &T10        Initiate ISDN loopback with self test
  &Vn                 View profile settings.
          &V0         View current active settings.
          &Vn         View the (n-1)th user profile settings (n=1-4)
          &V5         View factory default settings.
          &V6         View a/b adapter's setting
  &Wn     n=0-3       Write current settings to user profile n in
                      NVRAM.  (See also S35b6)
  &Yn                 Break handling.  (Destructive Break clears      S28b2-3
                      the buffer.  Expedited Break is sent
                      immediately to the remote system.)
                      For internal modem only
          &Y0         Destructive, expedited.
          &Y1  *      Nondestructive, expedited.
          &Y2         Nondestructive, unexpedited.
  &Zn=s   n=0-39      Write phone number s to NVRAM at location n
                      (n=0-39) use AT*Dn or ATS29=n to set the
                      default dial pointer.
  &ZIn=s  n=0-7       Assign the phone number (including
                      subaddress, if any) for various B-channel
                      protocols. In answer mode, these numbers
                      will be compared with the received called
                      party number and called party subaddress
                      information. The call will be accepted using
                      the specific protocol if the assigned number
                      of this protocol matches with the called
                      party number.
          &ZI0=s      Assign the phone number for X.75
          &ZI1=s      Assign the phone number for V.110
          &ZI2=s      Assign the phone number for V.120
          &ZI3=s      Assign the phone number for PPP async to
                      sync HDLC
          &ZI4=s      Assign the phone number for ISDN data
                      (Multi-Auto answering, auto detect the protocols)
          &ZI5=s      Assign the phone number for PPP async to
                      sync HDLC
          &ZI6=s      Assign the phone number for internal
                      fax/modem
          &ZI7=s      Assign the phone number for the a/b adapter
  &ZI?                Display the phone number (including subaddress
                      , if any) for various B-channel protocols
  &ZOx=s              Write own phone number (including
                      subaddress, if any). The number specified by
                      &ZOx will be used as the calling party number
                      while dialing
                      x = M(fax/modem), I(ISDN), or B(a/b adapter)
  &ZO?                Display the own phone numbers assigned via
                      the AT&ZOx=s command
  &Z?                 Display all the phone numbers stored in NVRAM.


  EXTENDED 'AT*' COMMAND SET
  Command             Function & Description                             Ref.
  *Cn                 Character length, including start, stop         S15b3-4
                      and parity bit.
          *C0  *      10-bit character length.
          *C1         11-bit character length.
          *C2         9-bit character length.
          *C3         8-bit character length.
  *Dn     n=0-39      Set default dial pointer at telephone               S29
                      directory location n.
          *D0  *      (See also S35b4 and S38b0)
  *En                 Internal modem error control negotiation.         S21b0
          *E0  *      if error control negotiation fails, keep the
                      non-error control connection.
          *E1         If error control negotiation fails,
                      disconnect the call (hang-up).
  *Gn                 Security function selection.                    S36b5-7
          *G0  *      Disable security function.
          *G3         Enable type 2 security, with password check.
          *G4         Enable type 2 security, with password check
                      and call back.
          *G5         Enable type 2 security, with password check
                      and call back, remote site enters the call
                      back number.
  *GCn                Call-back function selection.                    S119b0
          *GC0 *      Disable call-back function.
          *GC1        Enable call-back function
  *HCn    n=0-4       Modify call back phone number(AT*HCn=xxx)
  *HS                 Modify supervisory password (Default: 'ZyXEL').
  *Hn     n=0-39      Modify user password table at location n.
  *Qn                 Action taken when line quality changes.         S27b6-7
          *Q0         No action to poor signal quality.
          *Q1         Retrain action taken if signal quality is
                      poor.  (See also S41b2)
          *Q2  *      Adaptive rate, automatic fall-back or forward.
          *Q3         Disconnect if signal quality is poor.
  *T                  Recall the last CND (Caller ID) information.
  *V                  View password table
  *VC                 View call-back table


  FAX, FCLASS=2 'AT+F' COMMAND SET
  Command             Function & Description                             Ref.

  +<command>=<value>  Execute a command or set a parameter
  +<command>=?        Read permissible settings
  +<command>?         Read current setting
  +FAA=n              Auto answer mode parameter
          n=0         DCE to answer as set by +FCLASS
          n=1         DCE answers and auto-determines calling type
  +FBADLIN=<value>    Bad line threshold (number of consecutive bad lines for
                      a bad page parameter)
                      Determine if 'Copy Quality OK' on the T.30 flow chart.
                      <value>=0 to 255;  a value of 0 implies that error
                      checking is disabled.
  +FBADMUL=<value>    Error threshold multiplier
                      Determine if 'Copy Quality OK' on the T.30 flow chart.
                      <value>=0 to 255; a value of 0 implies that error
                      checking is disabled.
  +FBOR=n             Phase C data bit order
          n=0         Select direct bit order
          n=1         Select reversed bit order in receiving mode for phase C
                      data
  +FBUF?              Buffer size; read only parameter
                      Allow DTE to determine the characteristics of the DCE's
                      buffer size.
  +FCIG='string'      Local fax station ID string, for polling Rx
  +FCLASS=n           Service class selection
          n=0         Set to modem mode
          n=1         Set to Class 1 mode
          n=2         Set to Class 2 mode
          n=2.0       Set to Class 2.0 mode
          n=6         Set to ZFAX mode
          n=8         Set to Voice mode
          n=Z         Set to ZyXEL fax parallel port print and/or DRAM store
                      mode. (See also class Z 'AT+F' commands)
  +FCON               DCE response, fax connection made
  +FCQ=n              Copy quality check capability parameter
          n=0         No copy quality check capability
          n=1         Only check 1D phase C data
          n=2         Check both 1D and 2D phase C data
  +FCR=n              Capability to receive parameter
          n=0         DCE will not receive message data or poll a remote
                      device
          n=1         DCE receives message data or polls a remote device
  +FCTCRTY=<value>    ECM retry count; in Error Correcting Mode only
                      The sender will try to send a partial page 4 times.
                      <value>=0 to 255; units of 4 retries. If the Continue to
                      Correct (CTC) count is 0, it will not make any further
                      attempts.
  +FDCC=vr,br,wd,ln,  DCE capability parameters. Refer to EIA PN-2388 or
        df,ec,bf,st   user's manual for detailed descriptions
  +FDCS=vr,br,wd,ln,  Current session parameter. Refer to EIA PN-2388 or
        df,ec,bf,st   user's manual for detailed descriptions
  +FDIS=vr,br,wd,ln,  Current session negotiation parameters. Refer to
        df,ec,bf,st   EIA PN- 2388 or user's manual for detail descriptions.
  +FDR                Receive phase C data command, initiates document
                      reception
  +FDT [=df,vr,wd,ln] Transmit phase C data command, releases the DCE to
                      proceed with negotiation
  +FECM=n             Error correction mode control
          n=0         Error correcting mode is disabled
          n=2         Error correcting mode is enabled, handled by the DCE
                      alone, including buffering of partial pages
  +FET=n              End of page or document command
          n=0         More pages, same document
          n=1         End of document, another document follows
          n=2         No more pages or documents
          n=4         Procedure interrupt, another page follows
          n=5         Procedure interrupt, end of document, another document
                      follows
          n=6         Procedure interrupt, end of document
  +FK                 Orderly fax abort command
  +FLID='string'      Local ID string parameter
  +FLO=n              Flow control options
          n=0         No flow control
          n=1         Set XON/XOFF software flow control
          n=2         Set CTS/RTS hardware flow control
  +FLPL=n             Document for polling command
          n=0         The DTE has no document for polling
          n=1         Indicate document available for polling
  +FMDL?              Request DCE model
  +FMFR?              Request DCE manufacturer
  +FMINSP=n           Minimum phase C speed parameter
          n=0         2400 bps
          n=1         4800 bps
          n=2         7200 bps
          n=3         9600 bps
          n=4         12000 bps
          n=5         14400 bps
  +FPHCTO=<value>     DTE Phase C response timeout
                      Determine how long the DCE will wait for a command
                      after reaching the end of data when transmitting in
                      Phase C.
                      <value>=0 to 255; 100 ms units
  +FPTS=n             Page transfer status
          n=1         Received page good
          n=2         Page bad, retrain requested
          n=3         Page good, retrain requested
          n=4         Page bad, procedure interrupt requested
          n=5         Page good, procedure interrupt requested
  +FREL=n             Phase C received EOL alignment
          n=0         The EOL patterns are bit aligned as received.
          n=1         The last received bits of EOL patterns are byte
                      aligned by the DCE, with necessary zero fill bits
                      inserted. Refer to EIA PN-2388 for details.
  +FREV?              Request DCE revision
  +FSPL=n             Enable polling command
          n=0         Disable polling
          n=1         Enable polling


  FAX, FCLASS=2.0 'AT+F' COMMAND SET
  Command             Function & Description                             Ref.

  +<command>=<value>  Execute a command or set a parameter
  +<command>=?        Read permissible settings
  +<command>?         Read current setting
  +FAA=n              Auto answer mode parameter
           n=0        DCE to answer as set by +FCLASS
           n=1        DCE answers and auto-determines calling type
  +FBO=n              Phase C data bit order
           n=0        Select direct bit order
           n=1        Select reversed bit order in receiving mode for phase C
                      data
  +FBS?               Buffer size parameter, read only.
  +FCC=vr,br,wd,ln    DCE capability parameters. Refer to TIA-592 for details.
       df,ec,bf,st
  +FCLASS=n           Service class selection
           n=0        Set to modem mode
           n=1        Set to Class 1 mode
           n=2        Set to Class 2 mode
           n=2.0      Set to Class 2.0 mode
           n=6        Set to ZFAX mode
           n=8        Set to Voice mode
           n=Z        Set to ZyXEL fax parallel port print and/or DRAM store
                      mode. (See also class Z 'AT+F' commands)
  +FCO                DCE response, fax connection made
  +FCQ=<rq>,<tq>      Copy quality check capability parameter
                      Refer to TIA-592 for details.
  +FCR=n              Capability to receive parameter
           n=0        DCE will not receive message or poll a remote device
           n=1        DCE receives message data or polls a remote device
  +FCT=n              DTE phase C time-out parameter. n=0-255, 1 sec. units.
  +FDR                Receive phase C data command, initiates document
                      reception
  +FDT                Transmit phase C data command, releases the DCE to
                      proceed with negotiation
  +FEA=n              Phase C received EOL alignment parameter.
           n=0        Determine that T.4 EOL patterns are bit aligned (as
                      received).
           n=1        Determine that the last received bits of T.4 EOL
                      patterns are byte aligned by the DCE, with necessary
                      zero fill bits inserted.
  +FIE=n              Procedure interrupt parameter.
           n=0        Procedure interrupt requests from the remote station
                      are  ignored, and not reported to the DTE.
           n=1        Procedure interrupt requests from the remote station
                      are accepted, negotiated and reported using the +FVO
                      response.
  +FIP=n              Initialize facsimile parameters.
           n=0        (Or unspecified value) The parameters shall be set to
                      those specified in class 2.0.
  +FIS=vr,br,wd,ln,   Current session parameters. Refer to TIA-592 for
       df,ec,bf,st    details
  +FKS                Session termination command
  +FLI='string'       Local ID string parameter
  +FLO=n              Flow control options
           n=0        No flow control
           n=1        Set XON/XOFF software flow control
           n=2        Set CTS/RTS hardware flow control
  +FLP=n                     Document for polling command
           n=0        The DTE has no document for polling
           n=1        Indicate document available for polling
  +FMI?               Request DCE manufacturer identification.
  +FMM?               Request DCE model identification.
  +FMR?               Request DCE revision identification.
  +FMS=n              Minimum phase C speed parameter
           n=0        2400 bps
           n=1        4800 bps
           n=2        7200 bps
           n=3        9600 bps
           n=4        12000 bps
           n=5        14400 bps
  +FNR=rpr,tpr,idr,   Negotiation message reporting control parameters.
       nsr            Refer to TIA-592 for details.
  +FNS='string'       Non-standard byte string parameter.
                      'string': string of hexadecimal coded octets.
  +FPI='string'       Local fax station ID string, for polling Rx
  +FPP=n              Packet protocol control parameter.
           n=0        Disable the DCE-DTE packet protocol.
           n=1        Enable the DCE-DTE packet protocol. All the multi-
                      character messages from the DCE are sent to the DTE
                      using a simple packet protocol data link.
  +FPR=n              Serial port rate control parameter.
           n=0        Automatic DTE rate detection by the DCE.
           n>0        Serial rate is fixed at the value multiplied
                      by 2400 bps.
                      For example, n=8, DTE rate equal to 19,200 bps (8x2400)
  +FPS=n              Page transfer status
           n=1        Received page good
           n=2        Page bad, retrain requested
           n=3        Page good, retrain requested
           n=4        Page bad, procedure interrupt requested
           n=5        Page good, procedure interrupt requested
  +FRQ=pgl,cbl        Receive quality thresholds parameters. Refer to TIA-592
                      for details.
  +FRY=n              ECM retry value parameter. n=0-255, units of 4 retries.
  +FSP=n              Enable polling command
           n=0        Disable polling
           n=1        Enable polling


  FAX, FCLASS=1 'AT+F' COMMAND SET
  Command             Function & Description                             Ref.

  +<command>=<value>  Execute a command or set a parameter
  +<command>=?        Read permissible settings
  +<command>?         Read current setting
  +FCLASS=n           Service class selection
           n=0        Set to modem mode
           n=1        Set to Class 1 mode
           n=2        Set to Class 2 mode
           n=2.0      Set to Class 2.0 mode
           n=6        Set to ZFAX mode
           n=8        Set to Voice mode
           n=Z        Set to ZyXEL fax parallel port print and/or DRAM store
                      mode. (See also class Z 'AT+F' commands)
  +FTS=n              n=0-255. Stop transmission and pause, in 10 ms units.
  +FRS=n              n=0-255. Wait for silence, in 10 ms units.
  +FTM=<MOD>          Transmit data with <MOD> carrier.
  +FRM=<MOD>          Receive data with <MOD> carrier.
  +FTH=<MOD>          Transmit HDLC data with <MOD> carrier.
  +FRH=<MOD>          Receive HDLC data with <MOD> carrier.
                      The <MOD> parameter takes on the following values:

  Value   Modulation      Speed   Requirements
  3*      V.21 ch. 2      300     required for FTH & FRH
  24      V.27ter         2400    required for FTM & FRM
  48      V.27ter         4800    required for FTM & FRM
  72      V.29            7200    required for FTM & FRM
  73      V.17            7200    required for FTM & FRM
  74      V.17 w/st       7200    required for FTM & FRM
  96      V.29            9600    required for FTM & FRM
  97      V.17            9600    required for FTM & FRM
  98      V.17 w/st       9600    required for FTM & FRM
  121     V.17            12000   required for FTM & FRM
  122     V.17 w/st       12000   required for FTM & FRM
  145     V.17            14400   required for FTM & FRM
  146     V.17 w/st       14400   required for FTM & FRM

  * +FTH and +FRH support value 3 (V.21 ch. 2 / 300 bps) only
  w/st   with V.17 short training.


  FAX, FCLASS=6 'AT#' ENHANCED COMMAND SET
  Command             Function & Description                             Ref.

  #Bn                 'CONNECT FAX' result code enable or disable
           n=0        Disable, used in ZFAX mode, normal operation (*)
           n=1        Enabled, for BBS fax receiving application, this
                      command also changes 'CONNECT 12000/ARQ' to
                      'CONNECT 9600/ARQ'. This will also send out
                      external mail string 'ZyXEL' when fax is connected,
                      DCE will not send fax connection parameters
                      until <DC2> is received from DTE
           n=2        Enable Polling feature of Fax. Modem will send
                      polling signal to remote fax machine.
           n=3        Display ring cadence
           n=4        Disable Polling feature of Fax.
  #Cn                 Set minimun scan line time capability at the receiver
           n=0        20 ms at 3.85 line/mm, T(7.7)=T(3.85)
           n=1         5 ms at 3.85 line/mm, T(7.7)=T(3.85)
           n=2        10 ms at 3.85 line/mm, T(7.7)=T(3.85)
           n=3        20 ms at 3.85 line/mm, T(7.7)=1/2T(3.85)
           n=4        40 ms at 3.85 line/mm, T(7.7)=T(3.85)
           n=5        40 ms at 3.85 line/mm, T(7.7)=1/2T(3.85)
           n=6        10 ms at 3.85 line/mm, T(7.7)=1/2T(3.85)
           n=7         0 ms at 3.85 line/mm, T(7.7)=T(3.85)
  #En                 Display line conditions (if in On-Line state)
           n=0        Display mode off
           n=1        Display mode on
  #F                  Set the Modem into ZyXEL fax mode, same as AT&N32
  #H                  Display ISDN Country Code
  #Ln                 Set maximum recording length
           n=0        Set maximum recording length, A4 (297mm)
           n=1        Set maximum recording length, B4 (364mm)
           n=2        Set maximum recording length, unlimited.
  #P<string>          Set the local ID string, 25 characters max.
  #Rn                 Set recording width
           n=0        Set 1728 picture elements along a scan
                      line length of 215mm
           n=1        Set 2048 picture elements along a scan
                      line length of 255mm
           n=2        Set 2432 picture elements along a scan
                      line length of 303mm
  #Tn                 Coding Scheme
           n=0        Set to one dimensional coding scheme
           n=1        Set to two dimensional coding scheme
  #Vn                 Vertical resolution
           n=0        Set to normal vertical resolution
           n=1        Set to high vertical resolution

  Result Code (with #B0) 'CONNECT FAX/SnnnnVnTnRnLnCnP<string>'
              (with #B1) '/SnnnnVnTnRnLnCnP<string>'
                         'DISCONNECTxP<string>'

  Snnnn         First four digits of Fax connection speed
  Vn            Vertical resolution; n =0-1
  Tn            Coding scheme; n =0-1
  Rn            Recording width; n =0-2
  Ln            Recording length; n =0-2
  Cn            Scan time; n =0-7
  x             Disconnect with confirmation (x=0) or without (x=1)
  P<string>     Remote Fax number
  (*)           Manufacture default  (except when used  to represent
                AT* commands)


  FAX, CLASS Z 'AT+F' COMMANDS
  Command             Function & Description                             Ref.

  +FZF=n              ZyXEL fax receive mode parallel port print/auto
                      data/DRAM store selection
           n=0  *     Fax to printer, hang up if data. (Default)
           n=1        Fax to printer, data to serial port.
           n=2        Fax to DRAM and printer, hang up if data.
           n=3        Fax to DRAM , hang up if data.
           n=4        Fax to DRAM and printer, data to serial port.
           n=5        Fax to DRAM, data to serial port.
  +FZP                Print fax pages stored in DRAM if not printed yet
  +FZX?               Command to show the captured log on terminal.   S76b0-2
                      This feature is not available for the FAX
                      direct printing mode.


  VOICE, FCLASS=8, 'AT+V' COMMAND SET
  Command             Function & Description                             Ref.

  <command>=<value>   Execute a command or set a parameter
  +<command>=?        Read permissible settings
  +<command>?         Read current setting
  +FCLASS=n           Service class selection
           n=0        Set to modem mode
           n=1        Set to Class 1 mode
           n=2        Set to Class 2 mode
           n=2.0      Set to Class 2.0 mode
           n=6        Set to ZFAX mode
           n=8        Set to Voice mode
           n=Z        Set to ZyXEL fax parallel port print and/or DRAM store
                      mode. (See also class Z 'AT+F' commands)
  +FLO=n              Flow control options
           n=0        No flow control
           n=1*       Set XON/XOFF software flow control
           n=2        Set CTS/RTS hardware flow control
  +VDD=<dds>,<ddi>    Set the DTMF tone detection sensitivity threshold and
                      the required period of continuous presence.
       <dds>=0-31     Set DTMF detection threshold. A lower value means the
             *15      DCE will detect DTMF tone more sensitively. A value of
                      '0' diasbles DTMF detection.
       <ddi>=0-255    Set the duration of DTMF tone detection, in units of
             *8       5 ms. The modem reports DTMF event when it detects a
                      continuous tone of at least this time interval. A value
                      of '0' diasbles DTMF detection.
  +VGR=n   n=56-200   Set the gain of received voice samples. Higher value
           *0         results in a larger gain (the normal value is 128). The
                      value of zero is for DCE automatic gain control.
  +VGT=n   n=56-200   Set the volume of playing voice. Higher value results
           *128       in a louder voice
  +VIP                The DCE initializes all voice parameters to their
                      default settings
  +VIT=n   n=0-255    Set the inactivity time-out timer value, in units of
           *70        0.1 second.
  +VLS=n              Voice I/O device selection
           n=0        DCE is on-hook. Disconnect all I/O devices (local phone
                      connects to telco line).
           n=1        Connects to local phone (PHONE jack). DCE is on-hook.
           n=2        DCE (modem) connects to telco line (Dial-up line jack).
                      DCE is off-hook.
           n=8        Connects to external mic.  (local phone connects to
                      telco line). DCE is on-hook.
           n=16       DCE connects to internal speaker (use modem's internal
                      speaker for voice playback, local phone connects to
                      telco line), DCE is on-hook.
  +VNH=n              Automatic hang-up options
           n=0*       DCE does not disable automatic hang-up
           n=1        DCE disables automatic hang-up usually found in other
                      non-voice modes.
           n=2        DCE disables automatic hang-up in other non-voice modes.
                      DCE only performs a 'logical' hang-up
                      (it will not really hang-up on an ATH command).
  +VRA=n   n=0-255    Set the length of time the DCE shall wait between
           *70        ringbacks before the DCE assumes remote station has
                      gone off-hook, in units of  0.1 second
  +VRN=n   n=0-255    Set the length of time the DCE shall wait while looking
           *60        for the first ringback before the DCE assumes remote
                      station has gone off-hook, in units of 0.1 second.
                      If the value of +VRN is larger than S7,  S7 will take
                      effect.
  +VRX                Start the voice reception process
  +VSD=<sds>,<sdi>    Set the silence detection sensitivity threshold and
                      the required period of silence
       <sds>=0-31     Larger value means the DCE treats noisier  conditions
             *15      as silence (the higher the value, the higher the
                      sensitivity threshold level). Set value '0' to disable
                      silence detection.
       <sdi>=0-255    In units of 0.1 second, required period of silence for
             *70      detection
  +VSM=n              Voice compression method selection
                      Three sampling rate : 7200, 8000, 11025 bps
                      Three digital compression algorithm : DVI ADPCM,
                      A-law PCM, Mu-law PCM.
           n=2 *      19.2 Kbps 2-bit ADPCM
           n=3        28.8 Kbps 3-bit ADPCM
           n=30       30.72 Kbps 3-bit ADPCM with resync capability
           n=4        38.4 Kbps 4-bit ADPCM
           n=40                 4-bit DVI ADPCM
           n=80                 8-bit A-law  PCM
           n=81                 8-bit Mu-law PCM
  +VSM=?              Show you how to use these features.
         For example, to set DVI ADPCM with 8000 sampling rate, you use the
         command:  AT+VSM=40,8000
         The power on default sampling rate is 2Bit ADPCM with 9600bps.
  +VSY=n   n=0-255    Set Voice recording resync timer, in units of 50 ms.
           *0         Set value '0' to disable resync generation
  +VTD=n   n=0-255    Set the DTMF tone generation duration used in
           *10        conjunction with +VTS command, in units of 10 ms
  +VTS=<string>       Cause the DCE to generate DTMF and other tones.
                      Refer to 2864 series user's manual for details.
  +VTX                Start the voice transmission process
  '*'     Manufacturer default (Except when used to represent 'AT*' commands)
  Snnnbx  Cross reference to S-register number 'nnn' bit number 'x'


  BASIC S-REGISTERS, 'ATSn=x'
  Command     Function & Description                               +Def./Ref.

  S0=         Set the number of rings on which the modem will
              answer.  0 value disable auto-answer                       +000
  S1=         Counts and stores number of rings from an
              incoming call                                              +000
  S2=         Define escape code character, default <+> (43
              dec.)                                                      +043
  S3=         Define ASCII Carriage Return                               +013
  S4=         Define ASCII Line Feed                                     +010
  S5=         Define ASCII Backspace                                     +008
  S7=         Set duration, in number of seconds, modem waits
              for a carrier                                              +060
  S8=         Set duration, in seconds, for pause (,) option in
              Dial command and pause between command
              re-executions for Repeat (>)command                        +002
  S9=         Set duration, in tenths of a second, of remote
              carrier signal before recognition (Ignored if in
              non-FSK or half-duplex operation)                          +006
  S10=        Set duration, in tenths of a second, modem waits
              after loss of carrier before hanging up                    +007
  S11=        Set duration and spacing, in milliseconds, of
              dialed Touch-Tones                                         +070
  S12=        Reserved

  EXTENDED S-REGISTERS, 'ATSn=x'
  Command         Function and description                         +Def./Ref.

  S13=    bit     dec     hex     Bit-mapped register                    +000
                                  (for internal fax/modem only)
          1       2       2       Capture modem manufacturer information
                                  during V.42 handshake, can be
                                  displayed at ATI2 <Last Speed/
                                  Protocol> line if available (Flash or
                                  ZyXEL stands for ZyXEL connection)
  S14=    bit     dec     hex     Bit-mapped register:                   +002
          0       0       0       Modem auto-handshake on Originate mode
                  1       1       Modem auto-handshake on Answer mode
  S15=    bit     dec     hex     Bit-mapped register                    +130
          0,1     0       0       Even parity
                  1       1       Odd parity
                  2       2  *    No parity
          2       0       0  *    1 stop bit
                  4       4       2 stop bits
          4,3     0       0  *    10 bit character length                 *C0
                  8       8       11 bit  *C1
                  16      10      9 bit   *C2
                  24      18      8 bit   *C3
          7-5     0       0       Profile 0 as active settings after
                                  power on                                 Z0
                  32      20      Profile 1 as active settings after
                                  power on                                 Z1
                  64      40      Profile 2 as active settings after
                                  power on                                 Z2
                  96      60      Profile 3 as active settings after
                                  power on                                 Z3
                  128     80 *    Factory default as active settings
                                  after power on                           Z4
  S16=    bit     dec     hex     Test status register                   +000
                  0       0       No test in progress                     &T0
                  For internal fax/modem only:
                  1       1       Loopback test in progress               &T1
                  8       8       Loopback with self test in progress     &T8
                  For ISDN data call only:
                  9       9       Loopback test in progress               &T9
                  10      A       Loopback with self test in progress    &T10
  S18=            dec             Force modem to fix baud rate when idle +000
                  0          *    Disable fixed baud function
                  n+1             Enable baud rate fixing at idle, n=0-15
                                  baud rate value settings (n) the
                                  same as S20 value
  S19=            dec     hex     Modem connection mode, same        +000/&Nn
                  0-73    0-49    setting value as 'AT&Nn' command
  S20=            dec     hex     DTE speed (bps).  Auto detected from
                                  AT command                             +003
                  0       0       230400
                  1       1       115200         dec     hex     DTE speed
                  2       2       76800          9         9        9600
                  3       3       57600          10        A        7200
                  4       4       38400          11        B        4800
                  5       5       19200          12        C        2400
                  6       6       16800          13        D        1200
                  7       7       14400          14        E        460800
                  8       8       12000          15        F        300
  S21=    bit     dec     hex     Bit mapped register                    +178
          0       0       0       Maintain non-error control connection   *E0
                                  when modem error control handshake fails
                  1       1       Drop connection when modem error        *E1
                                  control handshake fails
          1-2     0       0       Speaker always Off                       M0
                  2       2       Speaker On until carrier is detected     M1
                  4       4       Speaker always On                        M2
                  6       6       Speaker On after last digit is dialed    M3
                                  out until carrier detected
          3       0       0       DSR always On                           &S0
                  8       8       According to CCITT (see also S44b4,     &S1
                                  S41b5)
          4       0       0       CD always On                            &C0
                  16      10      CD tracks presence of data carrier      &C1
                                  (see also S38b3)
          6-7     0       0       Assume DTR always On                    &D0
                  64      40      108.1, DTR Off-On transition causes     &D1
                                  dial of the default number
                  128     80      108.2 Data Terminal Ready, DTR Off      &D2
                                  causes the modem to hang up and return
                                  to command state
                  192     C0      108.2, DTR off causes the modem to      &D3
                                  hang up and reset the modem to profile
                                  #0 after DTR dropped
  S23=    bit     dec     hex     Bit mapped register                    +105
          0       0       0       Command echo disabled                    E0
                  1       1       Command echo enabled                     E1
          2       0       0       Insertion is not allowed during a
                                  phone call
                  4       4       Insertion is allowed during a phone
                                  call
          3-5     0       0       ATX0  (See result code table)
                  8       8       ATX1            dec      hex      AT
                  16      10      ATX2            40        28       X5
                  24      18      ATX3            48        30       X6
                  32      20      ATX4            56        38       X7
          6       0       0       Display result code in numeric format    V0
                                  (see S35b7)
                  64      40      Display result code in verbose format    V1
          7       0       0       Modem returns result code                Q0
                  128     80      Modem does not return result code (see   Q1
                                  also S40b1)
  S24=    bit     dec     hex     Bit mapped register                    +138
          0-2     0-7     0-7     Ring volume control, increments of 1   N0-7
                                  in decimal
          4-6     16-119  20-F0   0x10- 0x70  Speaker volume control,    L0-7
                                  increments of 16 in decimal value
  S27=    bit     dec     hex     Bit mapped register                    +156
          0-2                     For internal fax/modem:
                  0       0       No error control                        &K0
                  1       1       MNP4 + MNP3 (see also S41b0)            &K1
                  2       2       MNP4 + MNP5 (see also S38b5, S41b0)     &K2
                  3       3       V.42+MNP4                               &K3
                  4       4       V.42 + V.42bis (compatible with &K2)    &K4
          3-5     0       0       Flow control disabled                   &H0
                  24      18      Hardware (RTS/CTS) flow control         &H3
                  32      20      Software (XON/XOFF) flow control        &H4
                  40      28      Reserved                                &H5
          6-7                     For internal fax/modem:
                  0       0       No response to poor signal quality      *Q0
                  64      40      Retrain action taken if signal quality  *Q1
                                  is poor
                  128     80      Adaptive rate (auto fall-back /         *Q2
                                  forward) when signal quality changes  S41b2
                  192     C0      Disconnect when signal quality is poor  *Q3
  S28=    bit     dec     hex     Bit mapped register                    +068
          0                       reserved
          4-5     0       0       No guard tone                           &G0
                  16      10      Reserved                                &G1
                  32      20      1800 Hz guard tone                      &G2
          7       0       0  *    Select V.22 for 1200 bps communication
                  128     80      Select Bell 212A for 1200 bps
                                  communication
  S29=            0-39    0-39    Set default dial phone number pointer, +000
                                  use AT&Zn=s to store phone numbers       *D
  S31=            0-255    0-FF   Holds the ASCII decimal value of the   +017
                                  XON
  S32=            0-255    0-FF   Holds the ASCII decimal value of the   +019
                                  XOFF
  S35=    bit     dec     hex     Bit mapped register                    +000
          4       16      10      When Data/Voice switch is pushed,   *Dn S29
                                  modem will dial the default number
          7       128     60      Enable extended numerical result codes   V0
                                  from 50-71 when an error correction   S23b6
                                  connection is made, use with ATV0, see
                                  result code table
  S38=    bit     dec     hex     Bit mapped register                    +000
          0       1       1       Repeatedly dialing default number   *Dn S29
          3       8       8       DCD on/off sequence follows UNIX  &C1 S21b4
                                  standard, DCD high before connect
                                  message is sent, DCD off after last
                                  DCE response is sent
          4       16      10      Auto-mode fax receiving disabled        &N0
          5       32      20      Disable MNP5                            &Kn
  S39=    bit     dec     hex     Bit mapped register                    +000
                                  (for internal fax/modem only)
          2       4       4       Answer in originating mode              ATA
          3       8       8       Class 2 Fax Bitfax compatibility:
                                  +FCON at 2400 next phase at 19200
          4       16      10      Class 2 Fax mode DTE shifting:
                                  +FCON at current DTE, shift to 19,200
                                  when entering into the next phase
  S40=    bit     dec     hex     Bit mapped register                    +000
          1       2       2       No result code displayed in answer       Q2
                                  mode
  S41=    bit     dec     hex     Bit mapped register                    +000
                                  For internal fax/modem:
          0       1       1       Special MNP compatibility (see also     &Kn
                                  S27b0, S38b5)
          2       4       4       Disable retrain abort, up to 5 min.   S27b6
                                  for special satellite line condition    *Qn

          3       8       8       Enable CCITT signals 140 and 141 on
                                  EIA-232D interface
          4       16      10      In X2-X7 setting, modem waits for S6
                                  seconds before dialing and ignores
                                  dial tone detection
          5       32      20      DSR follows DCD and pulses (see also    &Sn
                                  S44b4)
          6       64      40      Force S0>=2                              S0
          7       128     80      Ignore calling tone, not to be used as
                                  fax detection
  S42=    bit     dec     hex     Bit mapped register                    +000
          3       8       8       Disable escape sequence code in answer
                                  mode
          4       16      10      Disable V.17, 14,400 Fax in calling
                                  mode, no effect to answering mode &N32
          5       32      20      Disable Data/Voice button
          6       64      40      Disable <RINGING> result code            Xn
          7       128     80      DCD forced on but pulse off for 0.5     &C0
                                  seconds at carrier loss
  S43=    bit     dec     hex     Bit mapped register                    +000
          0       1       1       Disable ZyXEL 16800 in Multi-Auto mode  &N0
          1       2       2       Disable ZyXEL 19200 in Multi-Auto mode
  S44=    bit     dec     hex     Bit mapped register                    +000
          3       8       8       ATDSn initiates auto-dial of the        &Zn
                                  stored numbers consecutively until a  S38b0
                                  connection is made
          4       16      10      DSR follows DTR (see also S41b5)        &Sn
  S56=            dec     hex     Hook flash detected time for a/b       +050
                  0-255   0-FF    adapter, in units of 10ms
  S57=    bit     dec     hex
          0-3                     Reserved
          4       16      10      Enables the reporting of Class 1 capability
                                  in the response to +FCLASS=?
          5                       Reserved
          6       64      40      Enables busy detection in dialing period
          7       128     80      Report 'DATA or FAX' before showing
                                  Connect Message
  S71=    bit     dec     hex     Bit-mapped register:                   +064
          0-2     0-5     0-5     ZyXEL fax receive mode select          +FZF
                 *0       0       Fax to printer, hang up if data
                  1       1       Fax to printer, data to serial port
                  2       2       Fax to DRAM & printer, hang up if data
                  3       3       Fax to DRAM, hang up if data
                  4       4       Fax to DRAM & printer, data to serial port
                  5       5       Fax to DRAM, data to serial port
          4       16      10      Delete DRAM fax file after printed
          5       32      20      Keep DRAM fax even it has been retrieved
          6      *0       0       High speed fax retrieval for ZFAX only
                  64      40      Slow retrieve process (for Class 2)
  S72=            dec     hex     Select printer type                    +000
                 *0       0       HP LJ-II series or compitable PCL Printer
                  1       1       HP LJ-III series or compitable PCL Printer
                  2       2       POSTSCRIPT Printer
  S73=    bit     dec     hex     Bit-mapped register:                   +008
          0      *0       0       Parallel Port for fax printing
                  1       1       Serial Port for fax printing
          1      *0       0       Fast PCL Printing
          2      *0       0       PCL printing resolution 300dpi         +FZR
                  4       4       PCL printing resolution 150dpi
          3      *8       8       Automatic resize for fax printing
          4-5     0-32    0-20    ZyXEL fax printing, paper size         +FZS
                  0       0       Paper size : LETTER (8.5 inch * 11 inch)
                  16      10      Paper size : LEGAL (8 inch * 14 inch)
                  32      20      Paper size : A4 (210 mm * 287 mm)
  S75=    bit     dec     hex     Bit-mapped register:                   +008
          0-2     0-5     0-5     Multiauto answered fax class selection
                  0       0       Auto answer by fax class 2
                  1       1       Auto answer by fax class 2.0
                  2       2       Auto answer by fax class 6 / ZFAX
                  3       3       Auto answer by fax class 1
                  4       4       Auto answer by fax class Z / DRAM
                  5       5       Auto answer by fax class Z / Printer
  S80=    bit     dec     hex     Bit-mapped register:                   +000
          4      *0       0       Not sending Low Layer Compatibility
                                  information for internal fax/modem
                  16      10      Sending Low Layer Compatibility
                                  for internal fax/modem
          6      *0       0       Not sending Low Layer Compatibility
                                  information for ISDN data call
                  64      40      Sending Low Layer Compatibility
                                  for ISDN data call
          7      *0       0       Not sending Low Layer Compatibility
                                  information for a/b adapter
                  128     80      Sending Low Layer Compatibility
                                  for a/b adapter
  S82=                            ISDN B channel protocol                  Bn
                  60              V.120 64000
                  61              V.120 56000
                  62              X.75  64000 Transparent
                  63              X.75  56000 Transparent
                  64              X.75  64000 T.70
                  65              X.75  56000 T.70
                  70              X.75  64000 BTX
                  71              X.75  56000 BTX
                  72              V.110 64000
                  73              V.110 56000
                  74              PPP async to sync 64K
                  75              PPP async to sync 56K
                  76              SLIP to sync HDLC conversion 64K
                  77              SLIP to sync HDLC conversion 56K
  S83=    bit     dec     hex     Bit-mapped register:                   +000
          0       0       0       Disable loopback 4 test                 CP0
                  1       1       Enable loopback 4 test                  CP1
          2       0       0       ISDN without V.42bis                   &K00
                  4       4       ISDN with V.42bis if applicable        &K44
          4-5     0       0  *    ATDs, ATDPs, and ATDTs is mapped        &O0
                                  to ATDMs
                  32      20      ATDs, ATDPs, and ATDTs is mapped        &O2
                                  to ATDIs
                  48      30      ATDs, ATDPs, and ATDTs is mapped        &O3
                                  to ATDBs
          6       0       0  *    DOVBS answer using 56Kbps (for USA only)
                  64      40      DOVBS answer using 64Kbps
          7       0       0  *    ISDN data call using nornal Bearer Service
                                  (for USA only)
                  128     80      ISDN data call using voice Bearer Service
  S84=    bit     dec     hex
          0-2                     Embedded protocol analyzer control      CCn
          0       1       1       Capture DTE-DCE interface protocol
                                  information
          1       2       2       Capture the B-channel (X.75 or V.120)
                                  frames
          2       4       4       Capture the D-channel protocol
                                  information
          3       0      *0       Display S register value in decimal
                                  format
                  8       8       Display S register value in hex format
          4      *0       0       Indicate Caller ID after the 1st RING
                                  message
                  16      10      Disable Caller ID indication
          5       0       0       Ambiguity resolution bit, A/B adaptor   &L0
                                  first
                  32      20      Ambiguity resolution bit, Fax/Modem     &L1
                                  first
  S85=    bit     dec     hex
          0       0       0       Call Bumping function disabled          CE0
                  1      *1       Call Bumping function enabled           CE1
          1-6            *0       Add-persist time interval              KAxn
          7       0      *0       S85b1-6 is in Second unit              KASn
                  128     80      S85b1-6 is in Minute unit              KAMn
  S86=            dec     hex     D-channel protocol selection(USA)        Pn
                                  The following number is valid for
                                  American version:
                  0       0       Northern Telecom proprietary ISDN
                  1       1       National ISDN 1 (1 SPID mode)
                  2       2       National ISDN 1 (2 SPIDs mode)
                  3       3       reserved
                  4       4       AT&T proprietary point-to-point
                  5       5       AT&T proprietary point-to-multipoint
                                  (1 SPID mode)
                  6       6       AT&T proprietary point-to-multipoint
                                  (2 SPIDs mode)
                                  All other values are reserved.
  S87=    bit     dec     hex
          4      *0       0       result code 46 for X7 is CONNECT 112K/......
                                  result code 47 for X7 is CONNECT 128K/......
                  16      10      result code 46 for X7 is CONNECT 112000/....
                                  result code 47 for X7 is CONNECT 128000/....
          5-6    *0       0       Bundle connection is disabled           &Jn
                  32      20      Bundle connection is enabled in answer
                                  mode only
                  64      40      Bundle connection is enabled in call
                                  mode only
                  96      60      Bundle connection is enabled in both
                                  directions

  S89=    bit     dec     hex     Bundle and data encryption control
          0      *0       0       DES disabled
                  1       1       DES preferred
          1      *0       0       Single DES is alright
                  2       2       Triple DES is preferred
          2      *0       0       PKDS on, key automatically generated
                  4       4       no PKDS, keyin the key words
          3      *0       0       Keep connection whether there is DES or not
                  8       8       Disconnect the call if DES link cannot be
                                  established
          4      *0       0       second voice call will be routed to a/b
                                  adaptor if &L1 is set
                  16      10      second voice call won't be routed to a/b
                                  adaptor if &L1 is set
          6      *0       0       disable the metering pulse
                  64      40      enable the metering pulse
  S100            dec     hex     B channel bundling protocol selection
                  0       0     * Multiple Link Protocol (MLP)
                  1       1       cFossil channel bundling (CCB)
                                  (not supported for American version)

  S102=   bit     dec     hex     Outgoing ISDN data type                 Bnn
                                  Value has the same definition as S82
  S103=                           Set number of RING to the a/b adapter
                  0               The call sent to the a/b adapter will
                                  keep ringing until the call is answered
                                  or the calling side on-hook.
                  n>0             When the RING count has reached the value
                                  set (n), the a/b adapter analog call will
                                  be re-routed to internal fax/modem
  S104+n=         dec     hex     Outgoing Service Indicator (for 1TR6 only)
                                  n = 0(internal fax/modem), 2(ISDN data),
                                      or 3(a/b adapter)
                  1       1       Fernsprechen
                  2       2       a/b - Dienste
                  7       7       Datenbertragung 64 kbps. The defaults
                                  are :
                                  2 - internal fax/modem
                                  7 - ISDN data
                                  1 - a/b adaptor)
  S108+n=         dec     hex     Outgoing Service Additional (for 1TR6 only)
                                  Information
                                  n = 0(internal fax/modem), 2(ISDN data),
                                      or 3(a/b adapter)
          SI=1    1       1       ISDN-Fernsprechen 3.1 kHz
                  2       2       Fernsprechen analog
          SI=2    2       2       Fax Gruppe 3
                  3       3     * Daten ber Modem
                  4       4       Btx ber Modem
          SI=7    0       0       Datenbertragung 64 kbps (X.75 SLP)
                  11------        Async V.110
                  01------        Extensions of async
                  --0-----      * Number of data bits : 8
                  --1-----        Number of data bits : 7
                  ---0----      * Number of stop bits : 1
                  ---1----        Number of stop bits : 2
                  ----0---      * No parity
                  ----1---        Even parity
                  11---000        1200 bps
                  11---011        2400 bps
                  11---100        4800 bps
                  11---101        9600 bps
                  11---110        14400 bps
                  11---111      * 19200 bps
                  01---000        38400 bps
                  1010----        Sync V.110
                  10100000        1200 bps
                  10100011        2400 bps
                  10100100        4800 bps
                  10100101        9600 bps
                  10100110        14400 bps
                  10100111        19200 bps
                  10101000        48000 bps
                  10101001        56000 bps
                  10101010        56000 bps for 56kbit-network
                  10101111        In band negotiation
  S108+n=         dec     hex     High Layer Compatibility (Non-1TR6)
                                  n = 0(internal fax/modem), 2(ISDN data),
                                      or 3(a/b adapter)
                 *0       0       No High-Layer-Compatibility
                                  information element will be sent
                  1       1       Telephone
                  4       4       Facsimile Group 2/3
                  40      28      Teletex service(Rec.F.220)
                  49      31      Teletex service(Rec.F.200)
                  50      32      Information interworking for
                                  video services(Rec.F.300 T.110)
                  53      35      Telex service(Rec.F.60)
                  56      38      Message Handling Syxtems(MHS)
                                  (Rec.X.400 series)
                  65      41      OSI application(Rec.X.200 series)
  S114=                           I-field data length (MSB byte)
  S115=                           I-field data length (LSB byte)
  S117=                           V.110 user rate                    B1n
  S118=   bit     dec     hex
          0      *0       0       Enable  dial-in call
                  1       1       Disable dial-in call(dial out only)
          3      *0       0       Disable CHAP option for PPP/MLPPP
                  8       8       Enable CHAP option for PPP/MLPPP
          4      *0       0       Use 3.1KHz Bearer service whenever
                                  possible for internal fax/modem
                  16      10      Use Speech Bearer service whenever
                                  possible for internal fax/modem
          5      *0       0       Use 3.1KHz Bearer service whenever
                                  possible for a/b adapter
                  32      20      Use Speech Bearer service whenever
                                  possible for a/b adapter
          6      *0       0       Enable the a/b adapter to accept global
                                  calls
                  64      40      Forbid the a/b adapter to accept incoming
                                  calls with MSN unmatched (including global
                                  calls, see AT&ZI=s)
          7      *0       0       Enable analog incoming calls
                  128     80      Reject analog incoming calls (pure ISDN data)
  S119=   bit     dec     hex
          0      *0       0       Disable call-back function(see AT*GC)
                  1       1       Enable call-back function
          1      *0       0       Disable point-to-point signaling DDI function
                  2       2       Enable point-to-point signaling DDI function
          2      *0       0       Disable point-to-multipoint signaling DDI
                                  function
                  4       4       Enable point-to-multipoint signaling DDI
                                  function
          3      *0       0       when no MSN(EAZ) is matched, the inbound
                                  call will be ignored
                  8       8       when no MSN(EAZ) is matched, enter multi-
                                  auto mode to detect protocol
          4       0       0       V.110 user rate = 19200 bps if DTE speed
                                  greater 19200 bps
                 *16      10      V.110 user rate = 38400 bps if DTE speed
                                  greater 38400 bps
          5      *0       0       enable normal MSN function              &ZIn=
                  32      20      treat the number assigned by &ZIn=xx..
                                  as subaddress and matches with the called
                                  party subaddress for inbound call routing
  S120=                           Accumulated charging unit (MSB byte) for B1
                                  channel
  S121=                           Accumulated charging unit (LSB byte) for B1
                                  channel
  S122=                           Accumulated charging unit (MSB byte) for B2
                                  channel
  S123=                           accumulated charging unit (LSB byte) for B2
                                  channel
  S124=           dec     hex     Empty IP packet interval for PPP       +000
                  0-255   0-FF    in units of 1s
  S125=   bit     dec     hex
          1-6            *0       Sub-persist time interval              KSxn
          7       0      *0       S125b1-6 is in Second unit             KSSn
                  128     80      S125b1-6 is in Minute unit             KSMn
  S126=           dec     hex     Add-threshold for BOD               JAn,+48
                  0-255   0-FF    in Kbps unit
  S127=           dec     hex     Sub-threshold for BOD               JSn,+32
                  0-255   0-FF    in Kbps unit

  In 'Reference' column, 'AT' is omitted when AT command is referred to.
  +nnn is manufacturer default when listed in 'Reference' column.
  bit     S-register bit number, 'b',  used in 'ATSr.b=n', 'ATSr.b=?'
  dec     Decimal value, 'x', used in 'ATSn=x'
  hex     Hex value, used in LCD model for setting 'STATUS REGISTER'
          manually from front panel

  RESULT CODE OPTIONS TABLE

  ATV0    ATV1            ATX0  X1   X2   X3   X4   X5   X6   X7
    0     OK               V    V    V    V    V    V    V    V
    1     CONNECT          V    V    V    V    V    @    $    #
    2     RING             V    V    V    V    V    V    V    V
    3     NO CARRIER       V    V    V    V    V    V    V    V
    4     ERROR            V    V    V    V    V    V    V    V
    5     CONNECT 1200          %    %    %    %    @    $    #
    6     NO DIAL TONE               V         V    V    V    V
    7     BUSY                            V    V    V    V    V
    8     NO ANSWER                       V    V    V    V    V
    9     RINGING*                        V    V    V    V    V
    10    CONNECT 2400          %    %    %    %    @    $    #
    11    CONNECT 4800          %    %    %    %    @    $    #
    12    CONNECT 9600          %    %    %    %    @    $    #
    14    CONNECT 19200         %    %    %    %    @    $    #
    15    CONNECT 7200          %    %    %    %    @    $    #
    16    CONNECT 12000         %    %    %    %    @    $    #
    17    CONNECT 14400         %    %    %    %    @    $    #
    18    CONNECT 16800         %    %    %    %    @    $    #
    19    CONNECT 38400         %    %    %    %    @
    20    CONNECT 57600         %    %    %    %    @
    21    CONNECT 76800         %    %    %    %    @
    22    CONNECT 115200        %    %    %    %    @
    23    CONNECT 230400        %    %    %    %    @
    24    CONNECT 460800        %    %    %    %    @
    25    CONNECT 921600        %    %    %    %    @
    26    CONNECT 307200        %    %    %    %    @
    27    CONNECT 153600        %    %    %    %    @
    28    CONNECT 102400        %    %    %    %    @
    29    CONNECT 61440         %    %    %    %    @
    30    CONNECT 51200         %    %    %    %    @
    31    CONNECT 624000        %    %    %    %    @
    32    CONNECT 124800        %    %    %    %    @
    33    CONNECT 62400         %    %    %    %    @
    34    CONNECT 41600         %    %    %    %    @
    35    CONNECT 31200         %    %    %    %    @    $    #
    36    CONNECT 24960         %    %    %    %    @
    37    CONNECT 20800         %    %    %    %    @
    38    CONNECT 33600         %    %    %    %    @    $    #
    39    CONNECT 28800         %    %    %    %    @    $    #
    40    CONNECT 26400         %    %    %    %    @    $    #
    41    CONNECT 24000         %    %    %    %    @    $    #
    42    CONNECT 21600         %    %    %    %    @    $    #
    43    CONNECT 48000         %    %    %    %    @    $    #
    44    CONNECT 56000         %    %    %    %    @    $    #
    45    CONNECT 64000         %    %    %    %    @    $    #
    46    CONNECT 112000        %    %    %    %    @    $    #
    47    CONNECT 128000        %    %    %    %    @    $    #

  Note:
  V       Supported
  %       Reporting DTE rate:
          <cr><lf>CONNECT DTE_Speed<cr><lf>
  @       For internal fax/modem:
          CONNECT DTE speed/Protocol Link speed/Error control level***
          Example: CONNECT 38400/V.32bis 14400/V.42bis
          For ISDN data call:
          <cr><lf>CONNECT DTE_Speed/Protocol DCE_Speed/Error_Control
                                                  [/Data_Compression]<cr><lf>
  $       <cr><lf>CONNECT DCE_Speed[/Error_Code]<cr><lf>
          Example: CONNECT 14400/ARQ
  #       For internal fax/modem:
          CONNECT Link speed/Error control (ARQ)/Error control level***
          Example: CONNECT 14400/ARQ/MNP5
          For ISDN data call:
          <cr><lf>CONNECT DCE_Speed/Error_Code/Protocol
                                 [/Error_Control[/Data_Compression]]<cr><lf>
  *       Use S42b6 to disable 'RINGING' result code
  ***     Data compression included.   'SREJ' is appended if a V.42
          connection with selective reject is established.
  Error_Code:
          NONE
          ARQ
  Error_Control: (This field will not show if no error control is negotiated)
          LAPB
          LAPD
          V42
  Data_Compression:
          V42b
  DTE_Speed:
          all possible DTE speed supported
  Protocol: (only ISDN protocols are listed here)
          X.75
          X.75M           ;X.75 with MLP Bundle
          X.75C           ;X.75 with cFos Bundle
          V110
          V120
          V120M           ;V.120 with MLP Bundle
          V120C           ;V.120 with cFos Bundle
          SLIP
          PPP
          BTX

  Use ATS35 bit 7 (ATS35.7=1) to enable the following numerical result
  codes when an error control connection is made.

      ATV0 Code    ATV1 String            ATV0 Code    ATV1 String
         50        CONNECT                   61        CONNECT 24000
         51        CONNECT 1200              62        CONNECT 26400
         52        CONNECT 2400              63        CONNECT 28800
         53        CONNECT 4800              64        CONNECT 31200
         54        CONNECT 7200              65        CONNECT 33600
         55        CONNECT 9600              66        CONNECT 38400
         56        CONNECT 12000             67        CONNECT 48000
         57        CONNECT 14400             68        CONNECT 56000
         58        CONNECT 16800             69        CONNECT 64000
         59        CONNECT 19200             70        CONNECT 112000
         60        CONNECT 21600             71        CONNECT 128000


