This file is intended to supplement the publications that you received with the
Concentrator.

This file is for the Version 1.10 release of the 8230 Models 04A and 04P (aka,
Models 04x) microcode support for RI/RO features.  See section 7 below for
operational differences between the 8230 Models x13 and the 8230 Models 04x
with the RI/RO support.  There were no changes for Version 1.20.

    ***************************************************************************

1.0 Changing to CMOL Network Management Mode from SNMP Network Management Mode

    Be sure to read the information about changing network management modes in
    the Installation and Service Guild.

    For 8230 Models 04x, simply set the manager switch to CMOL.

    ***************************************************************************

2.0 Notes on the Concentrator Configuration/Management Facility (CCMF)

    CCMF may indicate that a module is not installed during module
    initialization.  Refresh the module status after module initialization is
    complete to obtain the correct module status.  Initialization of the module
    may take up to 30 seconds after installation or a reset.

    Any faults for lobes attached to the Concentrator are reported on the
    Modify Lobe and View Active Addresses panel as "Fault Detected" for the
    Fault Status parameter.

    When accessing CCMF using "Procomm for DOS" in a DOS session on OS/2, the
    following DOS settings should be set for that session:

        COM_HOLD          ON
        DOS_FILES         25
        IDLE_SECONDS      15
        IDLE_SENSITIVITY  100

    Other PROCOMM parameters that are critical to successful operation of both
    PROCOMM for DOS and PROCOMM for Windows are:

        Software Flow Control (XON/XOFF) selected or set to ON

        Hardware Flow Control (RTS/CTS) deselected or set to OFF

        Select 'Relaxed Protocol Timings' for XMODEM or XMODEM-1K

    ***************************************************************************

3.0 Notes on configuring modems for use with CCMF

    Be sure to consult the documentation for your specific brand of modem.

    Be sure to read the information about modem configuration in the appendix
    titled "CMOL CCMF Overview" of the Installation and Service Guild.

    The modem attached to the device being used for CCMF should be configured
    so that the DCD signal tracks the state of the data carrier from the remote
    modem.  This is done with the &C1 command on most modems.

    If you wish to have the modem that is attached to the Concentrator
    disconnect, configure the way that the modem reacts to the Data Terminal
    Ready (DTR) signal.  This is done with the &D2 command on most modems.

    ***************************************************************************

4.0 Network Management Notes

    1. CMOL Management

       For correct graphical representation of the 8230 Model 04x with a RI/RO
       feature at the LNM station, LNM PTF UR45856 must be applied to LNM.
       The LNM for OS/2 Version 2.0 graphical representation without this PTF
       installed will present a Model 04x state that does not match the actual
       machine state.  This PTF will be available from LNM Support in May,
       1996.

       The 8230 Models 04A and 04P allow up to 6 managers to be efenabled (real
       time mode).  These managers will receive notifications for any changes
       occurring in the hub.

       The 8230 Models 04A and 04P allow up to 15 managers to establish an
       affiliation with the hub at any one time.  These affiliations will be
       cached out after 1 minute of inactivity unless the managers are
       efenable.   Efenabled managers are keep until they are efdisabled or
       reboot.  Reboot of the hub causes all affilitions to be lost.

    2. SNMP Management

       a. PTF U434441 for version 1.0 of LNM for AIX is required to enable LNM
          to manage an 8230 with the level of code supplied on this diskette.


       b. Nways Manager for Windows**, Version 1.0 is required to allow for the
          management of an 8230 model 04A or 04P.


          ** Trademark of Microsoft Corporation.

    ***************************************************************************

5.0 Updates to "8230 Models 04A and 04P Token-Ring Network Controlled Access
    Units Installation and Service Guide" (SY27-0349-00)

    1. Page 1-3 Change '&modall.' in the note at the top of the page to 'Models
       04A and 04P.'

    2. Page 4-2

       a. In Table 4-1 (Page 1 of 2) add:

           X'40 20'

          On Page 4-47 add the following section:

          --------------------------------------------------------------------
          | X'40 20'     MAC PO not found in poll cycle                      |
          --------------------------------------------------------------------
          Cause:  At the end of a Ring Poll Cycle (Neighbor Notification
                  Process), the MAC PO was not in the list of stations on the
                  ring.
          Action: None. (Unit will automatically retry on the next cycle.)

       b. In Table 4-1 (Page 2 of 2) change:

           X'61 00-61 0A' to X'E1 00-E1 0A'
           X'69 00-69 0D' to X'E9 00-E9 0D'
           X'71 11-71 AA' to X'F1 11-F1 AA'
           X'75 01'       to X'F5 01'

          Make the same error code corrections on Page 4-21.

    3. Page 5-12 The step labeled 'a' should be step after step 'c.'

    4. Page F-2 The line speed in step 3 should be 9600 bps.

    5. Pages I-6 and I-7 The MIB Chart in Figure I-2 is correct.  However, the
       text version on page I-6 should read:

       iso.org.dod.internet.private.enterprises.ibm.ibmProd.ibm-8230

       The concise form is 1.3.6.1.4.1.2.6.15

    6. Appendix J, pages J-1 and J-2

       a. Remove all references to Anixter.

       b. Table J-1 should read as follows:

             IBM Part Number  AMP Part Number  End Connectors  Length
             ---------------  ---------------  --------------  ------
                 55H9116        319210-1       Male to Female    2M
                                319210-2       Male to Female    4M
                                319210-3       Male to Female    8M

       c. Table J-2 should read as follows:

             IBM Part Number  AMP Part Number  End Connectors  Length
             ---------------  ---------------  --------------  ------
                 55H9115        319209-1       Male to Female    2M
                                319209-2       Male to Female    4M
                                319209-3       Male to Female    8M

       NOTE: All cables have 15-pin male connectors and 25-pin female
             connectors.

    ***************************************************************************

6.0 Known RMON deviations

    - If the ringStationStatus should be forcedRemoval (3) the 8230 will report
      the ringStationStatus as inactive (2).

      The ringStationStatus should be forcedRemoval when the reason the mac
      adapter took itself off of the ring was that it received a Remove Ring
      Station mac frame. One way to cause such a frame to be sent is by setting
      the RMON ringStationConfigControlRemove variable to removing (2) for the
      mac the manager desires to be removed.


     - NOTE: The following only apply on 8230's with PRE NM05A60 level mac code
             (see cauProdDataMACcodeLevel via SNMP). If desired, a MAC EPROM
             upgrade kit (FRU PN 25H5508) can be purchased through your IBM
             service representative.

             - tokenRingMLStatsRingPurgePkts and tokenRingMLStatsClaimTokenPkts
               counts may be low. If there is an uninterrupted burst of
               identical Ring Purge or Claim Token packets, only the first one
               in the sequence will be counted.

               - If the above occurs, this will cause tokenRingMLStatsMacPkts
                 and tokenRingMLStatsMacOctets to be correspondingly low.

    ***************************************************************************

7.0 Operational Differences

    This section lists operational differences between the 8230-04x with a
    RI/RO feature installed and the 8230-x13 with a RI/RO feature.

    1. Initialization and recovery timings

       Because there is only one MAC adapter in the Model 04x, initialization
       of the CAU and recovery from ring errors will take longer than the
       Model x13.

    2. Configuration Reporting Times

       The Model 04x will take longer to determine the address-to-port
       correspondance for inserted lobes.  This may result in noticeably longer
       refresh times as observed at a management station.

    3. RI/RO Feature

       A. Changing the Feature

          Insertion or removal of a RI/RO Feature will cause the Model 04x to
          perform a reset.

       B. Caution on wrapping Ring-in and Ring-out

          Wrapping both Ring-in (RI) and Ring-out (RO) from an in-band
          management function (NV/6000, LNM for AIX, LNM for OS/2, etc.), will
          cause the manager to loose contact with the Model 04x (unless the
          manager is connected to one of the concentrator's ports) and the
          manager will not be able to unwrap the concentrator.  To re-establish
          communications between the in-band manager and the concentrator, use
          the EIA port and CCMF to unwrap either RI or RO.

          To wrap both RI and RO on the same concentrator during problem
          determination, use CCMF instead of an in-band manager.

          NOTE: A reset or power (OFF/ON) cycle WILL NOT change the wrap
                condition of the unit.

       C. Caution on removing the RJ-45 RI/RO Feature

          Removal of the RJ-45 RI/RO Feature with the cables attached may cause
          an up-stream or down-stream concentrator to experience a high soft
          error rate, rather than detecting a hard error (beacon) condition.
          This is a result of cross-talk in the RJ-45 RI/RO Feature with no
          power applied.

          There is a much lower probability of this occuring if the cables are
          disconnected from the feature before it is removed; however,
          cross-talk in the cables may also cause this problem.

       D. LED Conditions

          a. Network Manager issues Wrap Command for either RI or RO

             Green LED - Blink

              Wrap LED - ON

          b. Disconnect cable from RI or RO

             Yellow LED - OFF on the RJ-45 RI/RO Feature

             Yellow LED - Blink on the Fiber RI/RO feature

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