

                   NI6510                              
              Installation Manual
	        Racal InterLan


             950-1255-00     Rev. AB


                    NOTICE

         The hardware described in this document
         is subject to change without notice.

         The information in this document is sub-
         ject to change without notice and should
         not be construed as a commitment by
         Racal InterLan.  While reasonable
         precautions have been taken, Racal In-
         terLan assumes no responsibility for any
         errors that may appear in this document.

         No part of this document may be copied
         or reproduced in any form or by any
         means without the prior written consent
         of Racal InterLan.

         Ethernet is a registered trademark of
         Xerox Corporation.
         IBM and Personal Computer AT are regis-
         tered trademarks of International Busi-
         ness Machines Corporation.
         MS-DOS is a registered trademark of Mi-
         crosoft, Inc.
         InterLan is a registered trademark of
         Racal InterLan.

         IM-NI6510
         Second Edition, September 1990




         Copyright  1990 by:
         Racal InterLan
         155 Swanson Road
         Boxborough, MA 01719

         All Rights Reserved
         Printed in the United States of America


                    TABLE OF CONTENTS

         PREFACE

            Who Should Read This Manual
            How This Manual Is Organized
            	Service and Support
            Conventions 
            Terminology 
            If You Have Comments about This
         Manual

         CHAPTER 1.  CHANGING THE CONFIGURATION	1-1

            The Preset Configuration   
            When to Change the Configuration
            How to Change the Configuration
            	Changing the I/O Base Address
            	Changing the Boot PROM Base Ad-
                dress	
            	Changing the Interrupt Request
                Level 
            	Changing the DMA Channel
            	Changing the Network Type


         CHAPTER 2.  INSTALLING THE NI6510 IN YOUR PC AT 

            Before You Begin Installation 


         CHAPTER 3.  CONNECTING THE NI6510 TO YOUR NETWORK

            Before You Begin	
            Connecting to Standard Ethernet
            Connecting to Thin Ethernet	


         CHAPTER 4.  USING THE NI6510 DIAGNOSTIC PROGRAM 

            Before You Begin	
            Starting the Diagnostics	
            Testing the NI6510 after Installation
            Internal and Network Tests	
            Running Tests Separately	
   	    Customizing the Diagnostics	


         APPENDIX A.  DIAGNOSTIC ERRORS	

            User-Correctable Errors	
   	    I/O Base Address-Related Errors	
   	    IRQ Level and DMA Channel-Related Errors	
   	    Network Connection-Related Errors	
            Hardware Failure Error Messages	


         SUPPORT SERVICES	



                      PREFACE


  The Racal InterLan NI6510 Ethernet data link controller is a     
  16-bit, high-performance, low-cost expansion card for PC ATs and 
  100% IBM compatible personal computers adhering to the ISA 
  (Industry Standard Architecture).

Who Should Read This Manual

   You should read this manual if you are going to install an NI6510 
   in a PC AT and connect it to your network.  Familiarity with 
   installing boards in PC ATs, and with the components of Ethernet 
   local area networks,	are helpful but not necessary.

How This Manual Is Organized

   This manual is organized as follows:

   Chapter 1 discusses the NI6510's preset configuration, why you might 
   need	to change it, and how to change it.

   Chapter 2 tells you how to install the NI6510 in your PC AT.

   Chapter 3 explains how to connect the NI6510 to the network.

   Chapter 4 describes how to use the diagnostic program.

   Appendix A lists all diagnostic error messages and explains what to do
   about them.

Service and Support

   Information about service and support for Racal InterLan products is 
   contained in the Support Services section at the end of this manual.

Conventions

   The term "enter," when used in reference to user input, means to type 
   the input and then to press the Enter key.

Terminology

   The following terms are used in this manual:

      *	ISA (Industry Standard Architecture) is a de facto industry 
        standard for the architecture evolved from the original IBM 
        PC system architecture.

      * PC AT refers to any personal computer AT, or AT clone, adhering 
        to the ISA.

      *	Network refers to either a standard Ethernet (IEEE 802.3 10BASE5)
        network, which uses the yellow or orange coaxial cable (RG-8), or 
        a Thin Ethernet (IEEE 802.3 10BASE2) network, which uses thin blue 
        or black coaxial cable (RG-58).

      *	Standard Ethernet refers to Ethernet networks using RG-8 coaxial
        cable.



If You Have Comments about This Manual

   The Technical Publications Department would like to receive any comments,
   corrections, or suggestions you have concerning this manual.  Send cor-
   respondence to the following address:

      Technical Publications Department
      Racal InterLan
      155 Swanson Road
      Boxborough, MA 01719


                NI6510 Installation Manual

                        CHAPTER 1.
                CHANGING THE CONFIGURATION


         This chapter describes the NI6510's
         preset configuration (the way the board
         is set up to work with your system), why
         you might need to change it, and how to
         change it.


         The Preset Configuration

            The NI6510's preset configuration
            settings are as follows:

               * I/O Base Address is 360 (hex).
               * Boot PROM is disabled.
               * Interrupt Request Level is 9
                 (IRQ9).
               * Direct Memory Access is set to
                 channel 3 (DMA3).
               * Network Type is Thin Ethernet.


         When to Change the Configuration

            You must change the configuration if
            any of these conditions are true:

               * The software you are using with
                 the NI6510 requires settings
                 that conflict with the preset
                 configuration settings.

               * The I/O base address, IRQ level,
                 or DMA channel matches that of
                 another board already installed
                 in your PC AT.

               * You add a Boot PROM.

               * Your network is standard
                 Ethernet.


            If you do not need to change the con-
            figuration, go to  Chapter 2.


         How to Change the Configuration

            To change any configuration setting,
            you must locate and change the cor-
            responding jumper setting on the
            board.  Jumpers are two-pin combina-
            tions each marked by a certain setting 
            (address, level, or channel).
            A small plastic block, the jumper
            block, fits over two pins of a jumper
            to enable it.

         	Follow these steps to change any
            jumper setting:

               1. Choose a new setting.

               2. Use your fingers or needle-nose
                 pliers to remove the jumper
                 block from its current location.

               3. Reposition the jumper block to
                 fit over the two pins that cor-
                 respond to the new setting.


            Note:  The NI6510 works only with the
            settings listed in each section of
            this manual.  If these settings are
            all being used, you must change the
            configuration of another board.

         Changing the I/O Base Address

            To change the NI6510's I/O base ad-
            dress, follow these steps:

               1. Choose a new address from the
                 list below that does not con-
                 flict with the I/O base address
                 of another board, and that meets
                 software requirements, if any.

                     	300 (hex)
                     	320 (hex)
                     	340 (hex)

               2. Position the jumper block on
                 the pins to correspond to the
                 new address.


            Note: The NI6510 I/O base address
            must be at least 10 (hex) below or 2
            (hex) above the I/O base address of
            any other board in your PC AT.

         Changing the Boot PROM Base Address

            To change the NI6510's Boot PROM set-
            ting, follow these steps:

               1. Choose a new address from the
                 list below that does not con-
                 flict with the Boot PROM base
                 address of another board, and
                 that meets the Boot PROM device
                 requirements, if any.

                     	D0000 (hex)
                     	D4000 (hex)
                     	D8000 (hex)
                     	DC000 (hex)

               2. Position the jumper block on
                 the pins to correspond to the
                 new address.

            Note: If no Boot PROM is to be in-
            stalled, the jumper block must be in
            the NO BOOT position.

         Changing the Interrupt Request Level

            To change the NI6510's interrupt re-
            quest level, follow these steps:

               1. Choose a new level from the
                 list below that does not dupli-
                 cate the IRQ level of another
                 board, and that meets software
                 requirements, if any.

                     	IRQ12
                     	IRQ15
                     	IRQ5

               2. Position the jumper block on
                 the pins to correspond to the
                 new setting.



         Changing the DMA Channel

            To change the NI6510's DMA channel,
            follow these steps:

               1. Choose a new setting from the
                 list below that does not con-
                 flict the DMA channel of another
                 board, and that meets software
                 requirements, if any.

                     	DMA0
                     	DMA5
                     	DMA6

               2. Position the jumper blocks on
                 the pins to correspond to the
                 new channel.

         Changing the Network Type

            To change the network type setting,
            follow these steps:

               1. Locate the switch on the
                 board's mounting bracket, at the
                 rear of the host.  It is marked
                 in the following way:
               	
                 "ENET" for Standard Ethernet is UP
                 "THIN" for Thin Ethernet is DOWN

               2. With your finger or a pointed
                 object, slide the switch up to
                 the position marked "ENET". You 
                 can now connect to a standard 
                 Ethernet network.  The opposite 
                 position is for connecting to 
                 Thin Ethernet.


 
               NI6510 Installation Manual

                        CHAPTER 2.
           INSTALLING THE NI6510 IN YOUR PC AT


         This chapter describes how to:

            * Gain access to your PC AT's expan-
              sion slots.
            * Install the NI6510.


         Before You Begin

            Make sure you have these tools:

               * A flat blade screwdriver
               * A Phillips-head screwdriver

         Installation

            To install the NI6510 in an IBM PC AT
            or an AT clone, follow these steps:

               1. Turn off your PC AT and dis-
                 connect the power cord.

               2. Open your PC AT to expose the
                 expansion slots. (Consult the
                 system documentation for in-
                 formation on this procedure.)

               3. Choose a full AT expansion
                 slot, designated by a 16-bit ex-
                 tension. Remove the screw and 
                 the expansion slot cover; 
                 save both.

               4. Place the NI6510 in the ex-
                 pansion slot, and push down 
                 gently until the board is fully 
                 seated in the slot.


            Caution:  Do not force the board into
            the expansion slot.  If you meet a
            great deal of resistance, remove the
            board and try again.

               5. Align the mounting bracket and
                 secure the board with the screw
                 that you saved.

               6. Close the PC AT and reconnect
                 the power cord.

            You are now ready to connect the
            NI6510 to your  network.



               NI6510 Installation Manual


                        CHAPTER 3.
          CONNECTING THE NI6510 TO YOUR NETWORK


         This chapter explains how to connect
         your NI6510 to a standard Ethernet or
         Thin Ethernet local area network.


         Before You Begin

            To connect to a standard Ethernet
            network, you need:

               * The slide latch adapter,
                 threaded clips, and screws that
                 came with the board

               * An available AC-coupled trans-
                 ceiver installed on a standard
                 Ethernet RG-8 cable

               * A transceiver cable with a male
                 and female 15-pin D-connectors

            To connect to a Thin Ethernet
            network, you need:

               * A Thin Ethernet RG-58 cable seg-
                 ment no longer than 185 meters
                 (610 ft)

               * A BNC T-connector (included with
                 the NI6510)

               * A 50-ohm BNC terminator, if your
                 PC AT is the first or the last
                 workstation on the network



         Connecting to Standard Ethernet

            Follow these steps to connect the
            NI6510 to an external transceiver on
            the standard Ethernet cable:

               1. Connect the transceiver cable's
                 female connector  to the trans-
                 ceiver.  Use the slide locks on
                 the connector bracket to secure
                 the connection.

               2. Assemble the slide latch adapt-
                 er plate at the male connector
                 end of the transceiver cable as
                 follows:

                   a. Slide a threaded clip over
                     the hole on each side of the
                     adapter plate.  Make sure
                     that the smaller hole faces
                     the transceiver cable.

                   b. Insert a mounting screw
                     into each threaded clip.

                   c. Slide the adapter plate,
                     bulging side away from the
                     cable, over the cable's
                     locking posts.

               3. Attach the transceiver cable's
                 male connector to the D-con-
                 nector.  Screw	the two mounting 
                 screws into the two screw mounts.


         Connecting to Thin Ethernet

            Follow these steps to connect the
            NI6510 to a Thin Ethernet network.

               1. Connect the T-connector's cen-
                 ter barrel to the BNC connector
                 on the mounting bracket.  Push 
                 the T-connector in and turn it 
                 clockwise to lock it into place.

               2. If your PC AT is the first or
                 last workstation on the network,
                 push a 50-ohm terminator in one
                 end of the T-connector; turn it
                 clockwise to lock.  Attach the
                 Thin Ethernet cable from the ad-
                 jacent PC AT to the other end of
                 the T-connector.

               3. If your PC AT is not the first
                 or last workstation on the
                 network, attach the Thin
                 Ethernet cable from the adjacent
                 PC ATs to each end of the
               	 T-connector.  Push the cables in
                 and turn them clockwise to lock.

                NI6510 Installation Manual


                        CHAPTER 4.
           USING THE NI6510 DIAGNOSTIC PROGRAM


         After installation, use the NI6510 Diag-
         nostic Program to test the board to make
         sure that it is installed properly, and
         that its network connection is func-
         tional.  This chapter tells you how to:

            * Start the diagnostics.
            * Run "All Tests".
            * Customize the diagnostic para-
              meters.

         Before You Begin

            Copy the following files from the
            diagnostic diskette to a directory in
            the DOS path:

               * NI6510DG.HLP
               * NI6510DG.EXE

         Starting the Diagnostics

            1. At the DOS prompt enter:

            	NI6510DG

             	The NI6510 Configuration Settings
              Table, which displays the config-
              uration settings, appears. If it 
              does not, copy the files to a 
              directory in the DOS path again, 
              and repeat this step.
 
             	Note:  If you have a configuration
              conflict, a warning message ap-
              pears.  Press any key to get to the
              Main Menu and exit the diagnostics.
              You must correct the conflict
              directly on the board(s) involved.
              Refer to Chapter 1 for information
              on how to do this.

            This table displays the configuration
            parameters read at startup.  Check to
            make sure the values are correct.


            2. Press any key to continue.  

            The Diagnostic Main Menu allows you
            to:

               * Run all tests.
               * Access other menus or help
                 screens.
               * Display the error log file.
               * Exit the program.

            You can now run all tests.  However,
            if you want to change logging devices
            or	run tests over a long period of
            time, first go to the "Customizing
            the Diagnostics" section later in
            this chapter.

         Testing the NI6510 after Installation

            You can run "All Tests" (all internal
            and network tests, except the Echo
            Test), to make sure the board and its
            connection are operating correctly.
            Follow these steps:

               1. "All Tests" is highlighted by
                 default when you begin.  Press
                 Enter.  Each test will run the
                 number of times specified by the
                 Test Repetition value (the de-
                 fault is one).

               2. Check the status window, which
                 appears to the right of the
                 menu, for pass or fail (error)
                 messages.  For a list of diag-
                 nostic error messages and what
                 to do about them, refer to Ap-
                 pendix A.


         Internal and Network Tests

            If a test fails, you can run it sepa-
            rately after running "All Tests".
            All internal tests are listed below.

               * "NI6510 Reset Test" performs a
                 software reset, and verifies
                 that the NI6510 responds cor-
                 rectly.

               * "Internal Register Test" tests
                 the two NI6510 registers'
                 ability to accurately hold data
                 patterns.

               * "Node Address PROM Test" reads
                 the NI6510's Ethernet address
                 PROMs, tests pattern bytes, and
                 verifies that they are correct.

               * "Initialize NI6510 Test" tests
                 the board's ability to communi-
                 cate with the PC AT.

               * "Internal Loopback Test" tests
                 the LAN controller's ability to
                 transmit and receive data inter-
                 nally, its CRC logic, and its
                 collision detection/retry logic.

               * "External Loopback Test" tests
                 the LAN controller's ability to
                 transmit and receive data ex-
                 ternally.



            All network tests are listed below:

               * "Transmit Test" tests the
                 NI6510's ability to
                 transmit frames to a target (ad-
                 dress) station.

               * "Receive Test" programs the LAN
                 controller to accept all incom-
                 ing addresses from the network,
                 and to count, check, and display
                 each frame on the screen.

               * "ITP Echo Test" tests data in-
                 tegrity on the network inter-
                 face.

               * "ITP Echo Server" enables the
                 NI6510 to be an echo server for
                 another NI6510 network con-
                 troller running the Echo Test.
               	
                	Note: Run network tests only
                 after all internal tests have
                 been run successfully.


         Running Tests Separately

            Follow these steps to run any inter-
            nal or network test:

               1. Use the  or  key to highlight
                 the appropriate menu, either
                 "Internal Tests Menu" or
                 "Network Tests Menu", and press
                 Enter.

               2. Use the  or  key to highlight
                 the appropriate test.  Press
                 Enter and the test runs.  Check
                 the status window for pass or
                 fail (error) messages.  See Ap-
                 pendix A for a list of all error
                 messages and what to do about
                 them.



         Customizing the Diagnostics

            Follow these steps to customize the
            diagnostics:

            1. Choose "Diagnostic Parameters
               Menu" from the Main Menu with
               the  or  key and press Enter.


            2. Use the  or  key to highlight
              any of the following three config-
              urable parameters, and press Enter.

               * Log File, if you want to set up
                 a different logging device

               * Test Repetition and Max. Error
                 Count, if you want to run tests
                 over a long period of time
               	
            3. Enter a new value at the prompt
              and press Enter.  The new value
              automatically appears in the Diag-
              nostic Parameters Menu.

            Note:  The diagnostic program auto-
            matically opens up a log file,
            6510_ERR.LOG, in the directory that
            the NI6510 diagnostic files are in.


               NI6510 Installation Manual

                       APPENDIX A.
                    DIAGNOSTIC ERRORS

         This appendix lists all error messages.
         The errors are either user-correctable
         or hardware failures (not user-
         correctable), and are grouped accordingly.


         User-Correctable Errors

            If you get a diagnostic error message
            in the status window, make a note of
            it.  Check this section to see if it
            is a user-correctable error.  If it
            is, reconfigure the necessary
            board(s) to correct the problem
            (refer to Chapter 1).

            Note: In the following messages, xxxx
            stands for variable data patterns
            that are not equal, and (n) is the
            phase number of the Internal Loopback
            Test.

         I/O Base Address-Related Errors

            If you get any of the following mes-
            sages, check your boards for an I/O
            base address conflict.  Reconfigure
            the board(s) to correct the problem
            (see Chapter 1).

               * WARNING:  Possible I/O address
                 conflict.
                 Reset Failure: Status Found:
                 xxxx Expected: xxxx

               * WARNING:  Possible I/O address
                 conflict.
                	Reg. 1 Data Failure: Found xxxx
                 Expected xxxx

               * WARNING:  Possible I/O address
                 conflict.
                	Reg. 2 Data Failure: Found xxxx
                 Expected xxxx



               * WARNING:  Possible I/O address
                 conflict.
                 NI6510 Node Address PROM Failure
                 detected.
                	I/O address xxxx Expected: xx
                 Found: xx

         IRQ Level and DMA Channel-Related Errors

            If you get any of the following mes-
            sages, check your boards for an IRQ
            level or DMA channel conflict.  Re-
            configure the board(s) to correct the
            problem (see Chapter 1).

               * INITIALIZE Complete interrupt
                 not detected.
                	WARNING:  Possible interrupt
                 level conflict,	or possible DMA
                 channel conflict.

               * Int Lpbk ph.(n) Initialize Done
                 Interrupt not found.
                	WARNING:  Possible interrupt
                 level conflict, or possible 
                 DMA channel conflict.

               * Int Lpbk ph.(n) Xmit Packet in-
                 terrupt not detected.
                	WARNING:  Possible interrupt
                 level conflict, or possible DMA
                 channel conflict.

               * Int Lpbk ph.(n) Rcv Packet in-
                 terrupt not detected.
                	WARNING:  Possible interrupt
                 level conflict, or possible DMA 
                 channel conflict.

               * Ext Lpbk Initialize done inter-
                 rupt not found.
                	WARNING:  Possible interrupt
                 level conflict, or possible DMA
                 channel conflict.

               * Ext Lpbk Xmit Packet interrupt
                 not detected.
                	WARNING:  Possible interrupt
                 level conflict, or possible DMA 
               	 channel conflict. (See also the
                 "Network Connection-Related Errors"
                 section for this error.)

               * Ext Lpbk Rcv Packet interrupt
                 not detected.
                	WARNING:  Possible interrupt
                 level conflict, or possible DMA
               	 channel conflict.

               * Transmit Packet Test:  Xmit in-
                 terrupt not detected.
                	WARNING:  Possible interrupt
                 level conflict, or possible DMA
               	 channel conflict.  (See also the
                 "Network Connection-Related Errors"
                  section for this error.)

               * Echo Test Error:  Xmit interrupt
                 not detected.
                	WARNING:  Possible interrupt
                 level conflict, or possible DMA 
                	channel conflict.

         Network Connection-Related Errors

            If you get any of the following mes-
            sages, check your network connection
            (see Chapter 3), and make sure the
            Network Type switch properly reflects
            your network type.

               * Initialization  Failure or Warn-
                 ing detected.
                	WARNING:  No Heartbeat detected.
                	Check coaxial cable connection.
                 (If your network is not config-
                 ured with heartbeat, ignore this
                 error).

               * External Loopback  Failure or
                 Warning detected.
                	WARNING:  No Heartbeat detected.
                	Check coaxial cable connection.
                 (If your network is not config-
                 ured with heartbeat, ignore this
                 error).



               * Ext Lpbk Transmitter error
                 detected.
                	Transmitter detected loss of
                 carrier.
                	Check network cable connection,
                 and thick/thin Ethernet switch
                 for correct setting.

               * Transmit Packet Test:  Trans-
                 mitter error detected.
                	Transmitter detected loss of
                 carrier.
                	Check network cable connection,
                 and thick/thin Ethernet switch
                 for correct setting.

               * Echo Test Error:  Transmitter
                 error detected.
                	Transmitter detected loss of
                 carrier.
                	Check network cable connection,
                 and thick/thin Ethernet switch
                 for correct setting.

               * Echo server Error:  Transmitter
                 error detected.
                	Transmitter detected loss of
                 carrier.
                	Check coaxial cable connection.

               * Ext Lpbk Xmit Packet interrupt
                 not detected.
                	WARNING:  Possible interrupt
                 level conflict, or possible DMA 
                	channel conflict.  (If your board is
                 set to Thin Ethernet, check your 
                 cable connection.)
                 
               * Transmit Packet Test:  Xmit in-
                 terrupt not detected.
                	WARNING:  Possible interrupt
                 level conflict, or possible DMA 
                	channel conflict.  (If your board is
                 set to Thin Ethernet, check your
                 cable connection.)
                 
               * Echo Test Error:  No response
                 from broadcast.
               	 Either the cable is not con-
                 nected, or there is no echo
                 server on the network.


               * Echo Test Error:  No response
                 from server.
                	Either the station running or
                 executing the echo server became
                 disconnected, or the execution
                 of the echo server has been
                 stopped.

            	
         Hardware Failure Error Messages

            The following messages indicate a
            hardware failure that you cannot fix.
            If you get any of the following error
            messages, refer to the Support Ser-
            vices section at the end of this
            manual.

               * Initialization  Failure or Warn-
                 ing detected.
                	Status Reg. Error:  Transmitter
                 timeout error.
                	Transmitter on longer than maxi-
                 mum packet time.

               * Initialization  Failure or Warn-
                 ing detected.
                	Status Reg. Error:  Missed pack-
                 et error detected.
                	Receiver ran out of receive
                 buffers.

               * Initialization  Failure or Warn-
                 ing detected.
                	Status Reg. Error:  Memory error
                 detected.
                	Did not receive READY signal
                 within 25.6uSec.

               * Internal Loopback failure
                 detected.
                	Status Reg. Error:  Transmitter
                 timeout error.
                	Transmitter on longer than maxi-
                 mum packet time.



               * Internal Loopback failure
                 detected.
                	Status Reg. Error:  Missed pack-
                 et error detected.
                	Receiver ran out of receive
                 buffers.

               * Internal Loopback failure
                 detected.
                	Status Reg. Error:  Memory error
                 detected.
                	Did not receive READY signal
                 within 25.6uSec.

               * Int Lpbk ph.(n) Transmitter
                 error detected.
                	Transmitter detected a buffer
                 error.

               * Int Lpbk ph.(n) Transmitter
                 error detected.
                	Transmitter detected an un-
                 derflow error.

               * Int Lpbk ph.(n) Transmitter
                 error detected.
                	Transmitter detected a late col-
                 lision error.

               * Int Lpbk ph.(n) Transmitter
                 error detected.
                	Transmitter detected loss of
                 carrier.

               * Int Lpbk ph.(n) Transmitter
                 error detected.
                	Transmitter detected a retry
                 error.

               * Int Lpbk ph.(n) Receiver error
                 detected.
                	Incoming packet contained a
                 frame error.

               * Int Lpbk ph.(n) Receiver error
                 detected.
                	Overflow error detected on in-
                 coming packet.

               * Int Lpbk ph.(n) Receiver error
                 detected.
                	A CRC error detected on incoming
                 packet.



               * Int Lpbk ph.(n) Receiver error
                 detected.
                	A Receive Buffer allocation
                 error detected.

               * Int Lpbk ph.(n) Xmit-Rcv Pckt
                 size mismatch error.
                	The receive frame packet size
                 did NOT match the size of the
                 packet transmitted.

               * Int Lpbk ph.(n) data mismatch.
                 Xmit=xx Rcv=xx.
                	The receive packet data field
                 did NOT match the transmitted
                 packet data field.

               * Int Lpbk ph.(n) CRC error
                 detected.  NI6510 CRC=xxxxxxxx
                 Calculated=xxxxxxxx  The genera-
                 ted hardware CRC did NOT match
                 the software calculated CRC.

               * Int Lpbk 3 Error:  Receiver in-
                 terrupt detected.
                	Phase 3 of the internal loopback
                 test, the receive frame inter-
                 rupt, should NOT occur.

               * Int Lpbk 3 Error:  TMD3 Retry
                 error bit not set.
                	Phase 3 of the internal loopback
                 test, the Retry bit, should have
                 been set.

               * Int Lpbk 3 TMD1 error bit not
                 set.  Phase 3 of the internal
                 loopback test, the Error bit,
                 should have been set.

               * External Loopback  Failure or
                 Warning detected.
                	Status Reg. Error:  Transmitter
                 timeout error.
                	Transmitter on longer than maxi-
                 mum packet time.



               * External Loopback  Failure or
                 Warning detected.
                	Status Reg. Error:  Missed pack-
                 et error detected.
                	Receiver ran out of receive
                 buffers.

               * External Loopback  Failure or
                 Warning detected.
                	Status Reg. Error:  Memory error
                 detected.
                	Did not receive READY signal
                 within 25.6uSec.

               * Ext Lpbk Transmitter error
                 detected.
                	Transmitter detected a buffer
                 error.
               	
               * Ext Lpbk Transmitter error
                 detected.
                	Transmitter detected an un-
                 derflow error.

               * Ext Lpbk Transmitter error
                 detected.
                	Transmitter detected a late col-
                 lision error.

               * Ext Lpbk Transmitter error
                 detected.
                	Transmitter detected a Retry
                 error.

               * Ext Lpbk Receiver error
                 detected.
                	Incoming packet contained a
                 frame error.

               * Ext Lpbk Receiver error
                 detected.
                	Overflow error detected on in-
                 coming packet.

               * Ext Lpbk Receiver error
                 detected.
                	A CRC error detected on incoming
                 packet.

               * Ext Lpbk Receiver error
                 detected.
                	A Receive Buffer allocation
                 error detected.



               * Ext Lpbk Xmit-Rcv Pckt size mis-
                 match error.
                	The receive frame packet size
                 did NOT match the size of the
                 packet transmitted.

               * Ext Lpbk data mismatch.  Xmit=xx
                 Rcv=xx.  The receive packet data
                 field did not match the trans-
                 mitted packet data field.

               * Transmit Packet Test:  Trans-
                 mitter error detected.
                	Transmitter detected a buffer
                 error.

               * Transmit Packet Test:  Trans-
                 mitter error detected.
                	Transmitter detected an un-
                 derflow error.

               * Transmit Packet Test:  Trans-
                 mitter error detected.
                	Transmitter detected a late col-
                 lision error.

               * Transmit Packet Test:  Trans-
                 mitter error detected.
                	Transmitter detected a Retry
                 error.

               * Receive Packet:  Fatal Error
                 detected.
                	Incoming packet contained a
                 frame error.

               * Receive Packet:  Fatal error
                 detected.
                	Overflow error detected on in-
                 coming packet.

               * Receive Packet:  Fatal error
                 detected.
                	A Receive Buffer allocation
                 error detected.

               * Echo Test Error:  Transmitter
                 error detected.
                	Transmitter detected a buffer
                 error.



               * Echo Test Error:  Transmitter
                 error detected.
                	Transmitter detected an un-
                 derflow error.

               * Echo Test Error:  Transmitter
                 error detected.
                	Transmitter detected a late col-
                 lision error.

               * Echo Test Error:  Transmitter
                 error detected.
                	Transmitter detected a Retry
                 error.

               * Echo Test Error:  Receive error
                 detected.
                	Incoming packet contained a
                 frame error.

               * Echo Test Error:  Receive error
                 detected.
                	Overflow error detected on in-
                 coming packet.

               * Echo Test Error:  Receive error
                 detected.
                	A CRC error detected on incoming
                 packet.

               * Echo Test Error:  Receive error
                 detected.
                	A Receive Buffer allocation
                 error detected.

               * Echo Test data mismatch:  Found
                 xx  Expected xx.
                	The receive packet data field
                 did NOT match the transmitted
                 packet data field.

               * Echo Server Error:  Transmitter
                 error detected.
                	Transmitter detected a buffer
                 error.

               * Echo Server Error:  Transmitter
                 error detected.
                	Transmitter detected an un-
                 derflow error.

               * Echo Server Error:  Transmitter
                 error detected.
                	Transmitter detected a late col-
                 lision error.

               * Echo Server Error:  Transmitter
                 error detected.
                	Transmitter detected a Retry
                 error.

               * Echo Server Error:  Receiver
                 error detected.
                	Incoming packet contained a
                 frame error.


               * Echo Server Error:  Receiver
                 error detected.
                	Overflow error detected on in-
                 coming packet.

               * Echo Server Error:  Receiver
                 error detected.
                	A CRC error detected on incoming
                 packet.

               * Echo Server Error:  Receiver
                 error detected.
                	A Receive Buffer allocation
                 error detected.


            If you get the following message, you
            do not have a problem with your
            NI6510.  This message indicates ei-
            ther a problem with your network, or
            with the board that sent the message.

               * Receive Packet:  Fatal Error
                 detected.
                	A CRC error detected on incoming
                 packet.



                     SUPPORT SERVICES

         This   section   explains   how  to  get
         customer support and how to get informa-
         tion   about   Racal   InterLan  Service
         Programs.

         If You Purchased from a Reseller

            You must contact the reseller or dis-
            tributor who sold you your Racal  In-
            terLan product(s) in any of these in-
            stances:

               * You received damaged product(s)

               * You  received  the  wrong   pro-
                 duct(s)

               * You need ordering, servicing, or
                 any technical assistance

         If You Purchased Directly from Racal In-
         terLan

            If you purchased product(s)  directly
            from Racal InterLan, and you are  ex-
            periencing any of the problems listed
            above, call Racal  InterLan.  In  the
            United States, use this number:
            	
            	1-800-LAN-TALK

            If you are calling from anywhere out-
            side the U.S., you must first  obtain
            your  country  code  for  the  United
            States from your International Opera-
            tor, then use it with this number:

            	1-(code)-508-263-9929  ext. 323
               	
         Racal InterLan Service Programs

            You may purchase any of Racal  Inter-
            Lan's service programs, regardless of
            who sold  you your  product(s).   For
            information  about  these   programs,
            write to Racal  InterLan at this  ad-
            dress:

               Racal InterLan
               155 Swanson Road
               Boxborough, MA  01719
               Attn. Customer Support Administrator



         Comments and Suggestions

            If you have  any comments or  sugges-
            tions, contact Racal InterLan at this
            uucp mail address:

            	uunet!interlan!engsup

            Or, you  can use  the darpa  internet
            address:

            	engsup@interlan.interlan.com

            Note:  These  two  addresses  are for
            comments and  suggestions only;  they
            are not for the purpose of  technical
            assistance.

