Installing A Timing Cable For E1 Unbalanced Nthr75 - Nortel Passport 15000 Hardware Installation And Maintenance

Hide thumbs Also See for Passport 15000:

Table of Contents

558 Chapter 17 Hardware procedures

Installing a timing cable for E1 unbalanced NTHR75

Prerequisites

Procedure steps

241-1501-240 5.2S2

Install a timing cable assembly for E1 unbalanced in Passport 15000 to

connect an E1 unbalanced timing signal from the site source to the

alarm/BITS module with PEC NTHR14.

You must be familiar with "Safety considerations and best practices"

You need a timing cable assembly with PEC NTHR75. This timing cable

is a 46-cm (18-in.) red cable assembly that converts the site coax BNC

connector to a 2W2 interface at the BITS module for E1 unbalanced

applications. See the ﬁgure "A timing cable assembly NTHR75"

For custom-made cables, see cable speciﬁcations in the 241-1501-200

Passport 15000, 20000 Hardware Description.

Connect the cable end labeled Rx to the Tx of the site timing source. Do

not use the end labelled Tx. Wrap electrical tape around the Tx end to

prevent metal-to-metal contact.

Use a line analyzer to determine the signal strength for the timing signals

at the J3 and J4 connections from the site source. The signal strength

must be within the range indicated in 241-1501-200 Passport 15000,

20000 Hardware Description .

If the signal is not within the range, ﬁx the problem between the point of

test and the site source. Depending on the length of cable from the site

source, you many need a thicker gauge cable to provide the signal

At the alarm/BITS module, plug the male D-sub connector of the cable

into the connector labelled J3.

Fasten the 2 small slotted screws of the D-sub connector to the

alarm/BITS module. Tighten to snug plus a 1/5 turn.

Repeat this procedure for the redundant timing setup. Connect the

second timing cable into the alarm/BITS connector labelled J4.

Show Quick Links

Table of Contents

Passport 20000