Nortel Networks DCT1900 User Manual

Page 272

Technical Product Manual - DCT1900

Installation Instructions, Modular Cabinet – CPU Cabling

20-8

Install-DCT1900/R8/mw

Connection to Alarm Device
The General Alarm relay is normally activated when the Modular Cabinet is switched on. If the
CPU generates a general alarm, the alarm relay is deactivated.
1.

Connect an alarm device to the GA–OUT connector on the MCCB (see Figure 20–4). When
the alarm device needs to make contact, connect the alarm device between contacts 1 and 2.
When the alarm device needs to break contact, connect the alarm device between contacts 2
and 3.

Fasten the cable to the cable tie blocks on the ground strip (see Figure 20–3) using a tie wrap.

CPU2 Sync Port Connector
The CPU2 has two RJ45 connectors, one for Sync In and one for Sync Out. (Figure 20-6)

The RJ-45 pins are identified as pins 1-8. While holding the RJ-45 connector with the locking tab
down and looking into the end that the cable is inserted into, pin 1 is on the far left, and pin 8 is on
the far right. Only pins 4 and 5 (orange pair) are used on the Input. The Output uses pins 1 & 2
(blue pair), 4 & 5 (orange pair), and 7 & 8 (green pair), providing 3 output signals on one cable.

CPU2 Sync Cable (AWS1153)
The cable used to synchronize 2 or more CPU2 boards is AWS1153. This cable is 25 ft. long and
is terminated at both ends in RJ45 connectors. The measured delay for this cable is 40
nanoseconds.

Connection to the Sync Cable
CPU2 to CPU2 - 2 REs (Figure 20-7)
When connecting a CPU2 to another CPU2, connect the sync cable, AWS1153 between the Sync
Out on the Master Radio Exchange CPU2 board and the Sync In on the Slave Radio Exchange
CPU2 board. Make sure that both the Master and Slave CPU2 boards are strapped correctly.
Refere to CPU2 board Section 5, Chapter 6. Enter the cable dealy, for this cable, 40 nanoseconds
into the Slave CPU2.