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From: phil@amdcad.UUCP (Phil Ngai)
Newsgroups: net.dcom
Subject: V.35 cables
Message-ID: <12717@amdcad.UUCP>
Date: Fri, 15-Aug-86 20:28:10 EDT
Article-I.D.: amdcad.12717
Posted: Fri Aug 15 20:28:10 1986
Date-Received: Sun, 17-Aug-86 07:23:42 EDT
Organization: AMDCAD, Sunnyvale, CA
Lines: 42

Recently someone asked about V.35.  In general, V.35 control signals
look like RS-232 and the clock and data signals are what you would
expect (transmit, receive, and three clock lines) except they are
differentially driven and use two wires each.

The control signals are especially like RS-232 in that few vendors
implement the same set. However, this has not been a problem for us.

We had been buying 34 conductor V.35 cables which were huge and
difficult to handle. I decided to try to get smaller cables. It turns
out that we can get by with 18 conductors.  I constructed a table to
help me decide which conductors to provide.  Perhaps someone else will
find it useful. Additions to the table are welcomed.

Black Box M/34 switch.
A,B,C,D,E,F,      P,R,S,T,U,V,W,X,Y,AA
No H,J,K. DTR, RI, LT.

HP BERT tester.
  B,C,D,E,F,H,    P,R,S,T,U,V,W,X,Y,AA
No A,J,K. FG, RI, LT.

AMD Cable.

  B,C,D,E,F,H,J,K,P,R,S,T,U,V,W,X,Y,AA
No A. FG.

BRIDGE GS/3.

A,B,C,D,  F,      P,R,S,T,  V,  X,Y,AA
No E,H,J,K,U,W. DSR,DTR,RI,LT,SCTE

ATT 2556 DSU.

  B,C,D,E,F,      P,R,S,T,U,V,W,X,Y,AA
No A,H,J,K. FG, DTR, RI, LT.
-- 
 Rain follows the plow.

 Phil Ngai +1 408 749 5720
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