Nortel Passport 15000, Установка и обслуживание оборудования, Страница: 556 / 874

556 Chapter 17 Hardware procedures
241-1501-240 5.2S2
10 The timing cable shield needs to be grounded on one end. Normally, do
this on the site’s BITS shelf of the timing source generator.
11 Determine the signal strength of the timing signals for the alarm/BITS
module by connecting a line analyzer at the wire-wrap terminals on the
terminal block, then at the DB9 connector pins of the cable assembly. The
pins to test are identified in:
• the table “Wiring pinout for J3 of cable assembly NTHW75”
(page 555)
• the table “Wiring pinout for J4 of cable assembly NTHW75”
(page 555)
• the figure “A timing cable assembly NTHW75” (page 557)
The range of DS1 signal strengths are identified in 241-1501-200
Passport 15000, 20000 Hardware Description. Depending on the length
of cable from the site source, you many need a thicker gauge cable to
provide adequate signal strength.
12 Connect the DB9 connector labelled J3 on the cable assembly to the J3
connection on the alarm/BITS module. Repeat for the J4 connection.