[comp.dcom.modems] Protocol BSC 2780/3780 ???

jacquemin-michel@CS.YALE.EDU (Michel Jacquemin) (06/17/89)

Can anybody tell me anything about communication protocols named BCS
2780 and BCS 3780, supposedly described in the IBM brochure
GA27-3063-3 ?

Also, does anything called "V26 LSI" exist?  What is it?

Please answer to me as I am not a regular reader of this newsgroup.

Thanks,

Michel Jacquemin (jacquemin@cs.yale.edu, ...!harvard!yale!jacquemin)
"Pour oublier les soucis de la vie antique, buvez du vin authentique" Asterix

lars@salt.acc.com (Lars J Poulsen) (06/17/89)

In article <63935@yale-celray.yale.UUCP> jacquemin-michel@CS.YALE.EDU (Michel Jacquemin) writes:
>Can anybody tell me anything about communication protocols named BCS
>2780 and BCS 3780, supposedly described in the IBM brochure
>GA27-3063-3 ?

(1) This question legitimately belongs in comp.protocols.misc, not
    comp.dcom.modems. I have redirected followups to comp.protocols.misc !

(2) The IBM2780 and IBM3780 Remote Job Entry systems are terminals
    consisting of a card reader, a line printer and an optional card
    punch. They speak EBCDIC over half-duplex modems, using a framing
    protocol called BSC (Binary Synchronous Communications) or BiSynC
    for short.
    Though these devices are three times obsolete (first for being
    oriented to batch data processing; second for using 80-column
    punched cards; third for using half-duplex BSC instead of
    full-duplex SNA) they live on in virtual memory as the lowest common
    denominator for connecting word processors of 1980 vintage to IBM
    mainframes.

>Also, does anything called "V26 LSI" exist?  What is it?

(3) V.26 is a CCITT standard for some type of modem. Since I'm posting
    from home, I don't have my standards book handy. If it's for use
    with the above, it's probably a half-duplex 4800 bps over two-wire
    circuit phase-shift-keyed modem.

/ Lars Poulsen <lars@salt.acc.com>     (800) 222-7308  or (805) 963-9431 ext 358
  ACC Customer Service                Affiliation stated for identification only
                  My employer probably would not agree if he knew what I said !!

GPWRDCS@gp.govt.nz (Don Stokes, GPO) (06/26/89)

In article <817@anise.acc.com>, lars@salt.acc.com (Lars J Poulsen) writes:
>>Also, does anything called "V26 LSI" exist?  What is it?
> 
> (3) V.26 is a CCITT standard for some type of modem. Since I'm posting
>     from home, I don't have my standards book handy. If it's for use
>     with the above, it's probably a half-duplex 4800 bps over two-wire
>     circuit phase-shift-keyed modem.

V26 is 2400 bps synchronous, half duplex, with 1200bps fallback, commonly
used on dialup RJE/BiSynch links - not sure on the modulation (most
likely phase shift).  The LSI part probably refers to a particular make -
several Philips & Sematrans (actually the same models) modems, including
V26 models, have "LSI" in the name, and I think Racal put it in as well. 

Don Stokes, Systems Programmer    /  /   Domain:                  don@gp.govt.nz
Government Printing Office,      /GP/   PSImail:          PSI%0530147000028::DON
Wellington, New Zealand         /  /   UUCP:  ...!munnari!vuwcomp!windy!gpwd!don
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