PRI cable length

Unanswered Question
Oct 4th, 2007


I am having a new IP Telephony installation. I am getting a new voice PRI from my provider. My provider is asking me what is the maximum length of cable he can have from his mux to my voice gateway. Can anyone have any idea on this?



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Overall Rating: 4.3 (3 ratings)
Paolo Bevilacqua Thu, 10/04/2007 - 10:12

That depends by cable attenuation and other factors, but consider safe 450 ft for T1.

Hope this helps, please rate post if it does!

dumble4me Thu, 10/04/2007 - 11:05

Hi Paulo,

Can you tell me what will be suggested length for E1?



Rob Huffman Thu, 10/04/2007 - 10:35

Hi Pete,

Here is a couple of docs to go along with Paolo's good info (congrats Paolo for your recent acheivements! 5 points for you);

Based on;

VWIC2-1MFT-T1/E1 1-Port T1/E1 Multiflex Trunk Voice/WAN Interface Card

VWIC2-2MFT-T1/E1 2-Port T1/E1 Multiflex Trunk Voice/WAN Interface Card

Selectable DSX-1 cable length in increments from 0 to 655 feet in DSU mode

Commands are shown in this doc;

Hope this helps!


PS: usually 50 to 100 feet is all the Telco needs :)


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