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Posted by glen herrmannsfeldt on August 8, 2005, 2:39 pm
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Tech Geek wrote:
> My question is regarding the transmission of multiple T1 signals on
> Category-5E cables bundled together. The reason I have this question is
> one of my data center customers decided to extend (48) T1 lines from
> the Telco room to IVR equipment over (48) Cat5E cables. Then terminate
> on standard 48-port RJ-45 patch panel. The intent is to run each T1 on
> an individual Cat5E cable (ie. Tx & Rx within each cable). My cusomter
> claims that there would be no intereference between all these T1 lines
> running together in the cable tray. The distance is over 100 feet.
> Normally, the way I design T1 cable runs is to either use 56-pair ABAM
> and terminate on a DSX panel; or substitute the ABAM with Category-3
> and terminate each Cat-3 bundle one for Tx and one for Rx.
> I was taught by an SBC engineer once that running more than 6-7 T1s in
> individual Category-5E/6 cables next to each other will cause
> interference or cross-talk. Is this true from your knowledge and
> experience??
Since T1 can normally be run over pairs of a 25 pair cable where
the possible coupling should be much higher than adjacent Cat5
cables, I wouldn't expect much of a problem.
Both inductive and capacitive coupling between twisted pairs increase
with frequency, and T1 runs at much lower frequencies than ethernet.
That isn't a guarantee, but it is an indication that the problem
should be much less than for ethernet.
-- glen
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