V.35 cabling question..

V.35 cabling question..
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Subject Author Date
V.35 cabling question.. Eugene Blanchard 05-06-2005
Posted by Eugene Blanchard on May 6, 2005, 2:56 pm
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I have to wire up several routers using V.35 for fractional T-1 line to a
cross connect. What type of cabling should I use?

I was planning on using Cat3 or 5 but since part of the signalling is
balanced and the other signals are unbalanced. What do I do with the
unbalanced signals? Do I pair them up with ground or don't worry about it.
The run is about 50 feet.




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Posted by Floyd L. Davidson on May 6, 2005, 8:28 pm
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>I have to wire up several routers using V.35 for fractional T-1 line to a
>cross connect. What type of cabling should I use?
>
>I was planning on using Cat3 or 5 but since part of the signalling is
>balanced and the other signals are unbalanced. What do I do with the
>unbalanced signals? Do I pair them up with ground or don't worry about it.
>The run is about 50 feet.

You can use tip or ring of a pair and 1) put nothing on the
other side, 2) put another control signal on the other side, or
3) ground the other side. All are about equal, though pairing
with another signal has slightly higher risk of crosstalk.

--
Floyd L. Davidson <http://web.newsguy.com/floyd_davidson>
Ukpeagvik (Barrow, Alaska) floyd@barrow.com


Posted by Doug McIntyre on May 7, 2005, 3:21 am
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>I have to wire up several routers using V.35 for fractional T-1 line to a
>cross connect. What type of cabling should I use?

Is it really worth the expense to do cross-connect at the V.35 level?
Thats got to what, tripple or quadruple the cost of an already
expensive connector to work with?

I would cross-connect at the T1 level, and treat the CSU/DSU's V.35
output as integral to the router and port it hooks up to. A lot less
wires to worry about hooking up. Loads and loads cheaper to work with.

I've never seen it implemented that way in my experiences.




Posted by Eugene Blanchard on May 7, 2005, 4:12 am
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Its for a lab in a school. It allows the students to wire the connections
and adds flexibility.

Doug McIntyre wrote:

>>I have to wire up several routers using V.35 for fractional T-1 line to a
>>cross connect. What type of cabling should I use?
>
> Is it really worth the expense to do cross-connect at the V.35 level?
> Thats got to what, tripple or quadruple the cost of an already
> expensive connector to work with?
>
> I would cross-connect at the T1 level, and treat the CSU/DSU's V.35
> output as integral to the router and port it hooks up to. A lot less
> wires to worry about hooking up. Loads and loads cheaper to work with.
>
> I've never seen it implemented that way in my experiences.



Posted by Reed on May 7, 2005, 4:18 am
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Eugene Blanchard wrote:
>
> I have to wire up several routers using V.35 for fractional T-1 line to a
> cross connect. What type of cabling should I use?
>
> I was planning on using Cat3 or 5 but since part of the signalling is
> balanced and the other signals are unbalanced. What do I do with the
> unbalanced signals? Do I pair them up with ground or don't worry about it.
> The run is about 50 feet.


Following quoted from
http://www.sangoma.com/signal.htm

"V.35 is a mixture of balanced (like RS422) and common earth (like
RS232) signal interfaces. The control lines including -- DTR, DSR.
DCD, RTS and CTS -- are single wire common earth interfaces,
functionally compatible with RS-232 level signals. The data and
clock signals are balanced, RS-422-like signals.

The control signals in V.35 are common earth single wire
interfaces because these signal levels are mostly constant or vary
at low frequencies. The high-frequency data and clock signals are
carried by balanced lines. Thus single wires are used for the low
frequencies for which they are adequate, while balanced pairs are
used for the high-frequency data and clock signals.

The V.35 plug is standard. It is a black plastic plug about 20mm
by 70mm, often with gold-plated contacts and built-in hold down
and mating screws. The V.35 plug is roughly 30 times the price of
a DB25, making everything to do with V.35 somewhat expensive."

--reed


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other useful resources:
The Federal Communications Commission (FCC)
Telecommunications Industry Association
Electronic and Software Security Products and Services
International Telecommunication Union

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