isdn wiring FREE cabling and networking Helpdesk
 Question by Eric Ullmann posted 22 May 2001
 isdn wiring
Hello and thank you for your time. I am installing an isdn line using cat 5 wire and a typical levinton cat 5 modular jack. I have 8 wires on the cat 5 jack and I can only use two wire on the telephone juction box where the lines from the pole come in. which two do I use
 Answer by Roman Kitaev posted 23 May 2001
Hi, Eric!

ISDN (basic access)uses pins 3&6 for Transmit and pins 4&5 for Receive.

If you jack is wired as 568B, then you have to connect pairs 1 and 3 (blue and green).

If you jack is wired as 568A, then you have to connect pairs 1 and 2 (blue and orange).

The wiring scheme for your Leviton jack is to be marked on it.

Best regards
Roman Kitaev, RCDD

Click here to see the expert's profile
Back to the current page of questions | Back to all the questions
Back to HELPDESK | Ask your question
Residential Cabling Guide

Home Cabling Guide

Finally, an instantly downloadable book that saves you thousands in home improvement dollars! Enjoy living in 21st century technology-advanced home while increasing its selling value and competitive advantage on the real estate market. Whether your cabling is for home office or high-tech leisure, you can wire your home yourself or learn "wirish" to speak with your cabling contractors in their language!

Learn more ...