[c-nsp] DS3 Length over RG-6 or RG-59

[Peder]

Does anybody have a good rule of thumb as to what type of coax to use for
DS3 over various distances? I know it has to be 75ohm, but have read it can
be RG-59 or RG-6. Also, on the RG-59 I have seen solid core and braided.
We have to run a cable about 250' to the telco equipment thru a messy
ceiling, so we only want to do it once with the correct cable. In the lab,
we just use cheap RG-59 but I don't know if it will have issues over a
distance of 250'. Thanks.

Peder


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[Jon Simola]

Post by Peder
Does anybody have a good rule of thumb as to what type of coax to use for
DS3 over various distances?  I know it has to be 75ohm, but have read it can
be RG-59 or RG-6.

I've only ever seen Coax 734 or 735 used in DS3 connections. 735 is
good for 200 feet, 734 for up to 400 feet.

--
Jon

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[Seth Mattinen]

Post by Jon Simola

Post by Peder
Does anybody have a good rule of thumb as to what type of coax to use for
DS3 over various distances? I know it has to be 75ohm, but have read it can
be RG-59 or RG-6.

I've only ever seen Coax 734 or 735 used in DS3 connections. 735 is
good for 200 feet, 734 for up to 400 feet.

RG-6 should work; I believe the Cisco DS3 cables are RG-6 with ferrites
on each end and should be good up to 400 feet as well. I'll wander
upstairs and pull the one I have in storage to double check.

~Seth
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[Seth Mattinen]

I was mistaken; the Cisco cable I have is Belden 9555 RG-59/U.

~Seth

----- Reply message -----
From: "Seth Mattinen" <***@rollernet.us>
Date: Thu, Sep 23, 2010 08:34
Subject: [c-nsp] DS3 Length over RG-6 or RG-59

Post by Jon Simola

Post by Peder
Does anybody have a good rule of thumb as to what type of coax to use for
DS3 over various distances? I know it has to be 75ohm, but have read it can
be RG-59 or RG-6.

I've only ever seen Coax 734 or 735 used in DS3 connections. 735 is
good for 200 feet, 734 for up to 400 feet.

RG-6 should work; I believe the Cisco DS3 cables are RG-6 with ferrites
on each end and should be good up to 400 feet as well. I'll wander
upstairs and pull the one I have in storage to double check.

~Seth
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[Jay Hennigan]

Post by Peder
Does anybody have a good rule of thumb as to what type of coax to use for
DS3 over various distances? I know it has to be 75ohm, but have read it can
be RG-59 or RG-6. Also, on the RG-59 I have seen solid core and braided.
We have to run a cable about 250' to the telco equipment thru a messy
ceiling, so we only want to do it once with the correct cable. In the lab,
we just use cheap RG-59 but I don't know if it will have issues over a
distance of 250'. Thanks.

I would recommend 734 type cable which is designed for DS3. It is
similar in size to RG-59 but made to better tolerances than you're
likely to find in RG-59. It's available in figure-8 twin configuration
specifically for DS3 transmit/receive.

The cable you'll typically find these days sold as RG-59 is designed for
TV distribution and often has copper-clad steel center conductor instead
of pure copper as well as aluminum foil shield with drain wires instead
of copper braid. Terminating this stuff with BNC connectors is a pain.
It's designed for the F-type connectors used in cable TV.

Also ensure that you use 75-ohm BNC connectors. The insulator is shaped
differently than the normal 50-ohm type commonly available.

--
Jay Hennigan - CCIE #7880 - Network Engineering - ***@impulse.net
Impulse Internet Service - http://www.impulse.net/
Your local telephone and internet company - 805 884-6323 - WB6RDV
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