ITEM: S5207L

What's the max V.35 cable length for the SNA Portmaster (MPQP) adapter

Question:

We are runing SDLC and want to create a V.25 cable that is extra long.
What's the longest cable that is supported.

Response:

We actually spoke on this yesterday.  Essentially, you are running
SDLC and want to create a V.35 cable that is extra long.  The question
is:  What's the longest cable supported in the V.35 spec.

Unfortunately, I don't have the spec -- but I feel certain that the
cables we offer are shorter than that maximum.  Since I don't believe
we sell custom V.35 cables, I don't really know what the maximum would
be.  

I recommended either getting a copy of the spec (CCITT 1984 'red book')
and looking it up or calling a cable manufacturing company for this
information.  Black Box, for example, is one company that wires custom
cables and would very likely have this maximum value readily available
for that reason.

In the meantime, I'll see what I can do to find this, but I can't
promise anything.

Response:

You said SDLC, so I'll assume you're using the MPQP (Portmaster w/selectable
EIB and interface cable).  

I discovered the maximum cable lengths supported on the Portmaster with 
"selectable" EIB and interface cable in the Portmaster Adapter Guide
to Operations Manual.  The pages of interest are 1-1 thru 1-3, 1-10/11, 
and 2-8.

This manual says the maximum cable length for V.35, RS232 (V.24) and 
X.21 is 50 feet (15.2 meters.)  Shielded twisted pair cabling is recom-
mended -- especially in high noise areas.  The documentation says RS422
can be run up to 400 feet (122 meters) with recommended surge protection
as documented in the manual.



Support Line: What's the max V.35 cable length for the SNA Portmaster (MPQP) adapter ITEM: S5207L

Dated: March 1995 Category: N/A

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