Organization: Bar-Ilan University Computing Center, Israel
Date: Sun, 24 Jan 1993 13:20:27 IST
From: <P82045@BARILVM.BITNET>
Newsgroups: comp.dcom.servers
Subject: Re: Can a server output to serial line?

In article <1993Jan22.201139.25448@bnlux1.bnl.gov>, foxworth@bnlux1.bnl.gov (Bob
Foxworth) says:
>
>We have a Xyplex Maxserver 4500 containing two MX2120A 8-port
>terminal server cards. Right now I have them wired to ports on a data
>PBX linecard which are configured as a destination class, so that a user
>of the data PBX can select 'xyplex' as a destination, and then reach
>one of the Xyplex's serial ports which is acting as an input. Then the
>user reaches the network to do a LAT or telnet connect to wherever. They
>are DTE and the PBX is using a DCE type fanout cable to its line card.
>
>Someone here has asked about the possibility of creating a destination
>in the xyplex, other than getting onto the ethernet. This destination
>would have to reach a serial input on an old DG computer, running at
>9600 bps, and would, it seems require reconfiguring a serial port on
>the xyplex as a destination and then hardwiring it to the DG serial
>input. I don't know of any way to (1) specify a destination inside
>the xyplex, other than the network, or (2) reconfigure a serial port
>on a individual basis. Doing this would allow someone calling the
>xyplex from the PBX to then log onto the DG at 9600 bps, bypassing
>the ethernet side of the interface entirely.
>
>The functionality the requester wants is to be logged onto a workstation
>somewhere in the facility, telnet to the xyplex over the network and
>then come out of it, onto a serial line and reach the DG input. This
>would let someone work on the DG from locations with no PBX service.
>
>The PBX already reaches the DG serially, but that isn't helping me in my
>debate with the person who wants the xyplex hookup, so I need to come
>up with some real data on it's feasability. I have looked at the book
>to some degree, but no luck there.
>
>As an aside, the xyplex supports standard rs-232 pins 2,3,7,8,20 and
>22 and the DG interfaces are 2,3,4,5 and 7. So handshaking could become
>really interesting. I believe it can't be done but would like to have
>either confirmation or enlightenment. Please either post to the group
>or email me any thoughts on the possibility of doing this, many thanks.
>
>Bob Foxworth
>

         Hi Bob!


 We're using the Xyplex 1800 and we configured & connected a few ports
 into a 7171 (serial asynchronous controller) for remote connection.

 Concerning your question we configured the server as follows:

   1. Define server internet rotary (assigns an internet  address to
       port/s).

   2. Define/set the telnet remote port as the telnet default port
      (i.e 23).

   3. Define port access as remote.

   4. Define port signal check as enabled (Enables you to restrict
      connections offered at this port, if the DSR is diasserted)


 Concerning wiring configuration we made the following:



              XYPLEX (RJ45)                 7171 (DB25)
              -------------                 -----------

    RING           1 --------------------------- 22

    DTR            2 ------------------------|--  6
                                             |-- 20

    XMT            3 ---------------------------  3

    GND            4 |--------------------------  7
                   5 |

    RCV            6 ---------------------------  2

    CD(DSR)        7 -------------------------|-- 4
                                              |-- 5
                                              |-- 8




                                Hope this will be of any help


                                       Naftali Keren