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      Beware file for DECnet/SNA TOPS-20 Gateway Management


Known problems:  None


Known differences:

The NCP DUMP command that forces a dump of DN20 DECnet front  end
is NOT the way the DECnet/SNA gateway dumps to its host node.  To
cause the DX24 Gateway to upline dump, press the BREAK key on the
Gateway node's console terminal, then type 40G to tranfer control
of the processor to location 40  and  the  upline  dump  routine.
Once  the  dump  is completed, the Gateway software automatically
reboots.  If this does not  happen,  use  the  NCP  SET  EXECUTOR
command  to  set  executor to your DN20 node and then use the NCP
TRIGGER command to reboot the Gateway.  An easier way would be to
just  toggle  the  boot switch on the front panel of the Gateway.
APPENDIX  F  of  the  DECnet-20/SNA  Gateway   Management   Guide
describes in more detail the upline dump procedure.

Upline dumping of the DX24 through a DN20 front end requires  the
DN20  software  to  be  rebuilt  with  the  changes  contained in
Autopatch Tape 10.


Known differences with manuals:

One of the manuals included with this product is  the  DECnet/SNA
Gateway  Installation  Guide.   This  manual  may not include all
information needed by TOPS-20 users of the Gateway.  To determine
whether  it  does, look at the manual's title page, which is just
after the orange cover page.  If the title page lists a  software
version  number greater than 1.2, the manual is complete, and you
should ignore the following information on the  manual.   If  the
title  page  lists  software  version  number  1.2, then read the
following information, which supplements the manual.

All sections and tables referred to below are in  the  DECnet/SNA
Gateway Installation Guide:


1. Table 2-1 (in Section 2.1, Hardware for a DX24 DECnet/SNA Gateway)
   should read:


Table 2-1:  DECnet/SNA Gateway Line Considerations -- DX24 Gateways

                                                Maximum
Network      Synchronous           Connecting   Supported
Connection   Line Interfaces       Device       Line Speed

             Gateway    DECnet 


DECnet-VAX   DMR11      DMR11      Modem (ME)   19.2Kbps
                                   Coax         56Kbps

                        DMF32      Modem (ME)   19.2Kbps

DECnet-RSX   DMR11      DMR11/     Modem (ME)   19.2Kbps
                        DMV11      Coax         56Kbps

                        DUP11      Modem (ME)   9.6Kbps

                        DPV11      Modem (ME)   4.8Kbps

DECnet-20    DMR11      DMR11      Modem (ME)   192Kbps        |
                                   Coax         56Kbps         |
                        KMC/DUP    Modem (ME)   19.2Kbps       |

IBM SNA      DUP11                 Modem (ME)   9.6Kbps

A DMC11 is not a supported DN20 line interface for lines going |
to a DECnet/SNA Gateway.                                       |


2. When you read the discussion of event logging in Section 4.2.3
   (CONFIGWY - Define Other Gateway Parameters), keep in mind the
   following:

        For a TOPS-20  host,  you  usually  enable  FILE.   On  a
        TOPS-20  system,  when  you enable FILE, events go to the
        logging  file  used  by  DECnet-20  Network   Management,
        usually  SYS:ERROR.SYS.  You can use the SPEAR program to
        analyze the contents of this file.  For more  information
        on  events,  see the DECnet/SNA TOPS-20 Gateway Manager's
        Guide, Appendix B, Event Types  and  Classes.   For  more
        information  on  SPEAR,  see  the  TOPS-10/TOPS-20  SPEAR
        Manual.

3. Table 4-1 (in Section 4.5.2, Using TRIGGER to Bootstrap the Gateway)
   should read:


Table 4-1:  TRIGGER commands for DECnet systems

$ RUN SYS$SYSTEM:NCP        (on VMS systems)

>RUN $NCP                   (on RSX systems)

$OPR                        (on TOPS-20 systems)      |
OPR>ENTER NCP                                         |

4. When reading Section 4.5.2, Using TRIGGER to Bootstrap the Gateway,
   keep in mind the following:

           Before issuing the TRIGGER command to bootstrap the Gateway from
           a TOPS-20 system, type the following commands:

                NCP>SET EXEC NODE nodeid USER userid PASS password
                     where nodeid is the DECnet-20 front end
                NCP>SET CIRCUIT circuitid SERVICE ENABLED
                     where circuitid is the circuit to the Gateway
                NCP>SET NODE gnodeid SERVICE PASSWORD password
                     where gnodeid is the DECnet node name of the Gateway
                NCP>SET NODE gnodeid SERVICE CIRCUIT circuitid
                     where circuitid is the circuit to the Gateway
                NCP>SET NODE gnodenum NAME gnodeid
                     where gnodenum is the Gateway's DECnet node number

   If you have configured your DECnet host  system  properly  for
   the  DX24  Gateway, the SYSTEM:GATEWAY.CMD file that was taken
   during system startup will have  set  these  commands  in  the
   DN20.   However,  if  your  DN20  has  reloaded  since  system
   startup,   you   will   need   to   issue   the    NCP    TAKE
   SYSTEM:GATEWAY.CMD  command  again.  When these parameters are
   setup you only need to issue the NCP TRIGGER command with  the
   following syntax to bootstrap the DX24 gateway remotely:

      NCP>SET EXEC NODE nodeid USER userid PASS password
           where nodeid is the DECnet-20 front end
      NCP>TRIGGER NODE gnodeid
           where gnodeid is the DECnet node name of the Gateway
   --------