Nortel Passport 15000, Установка и обслуживание оборудования, Страница: 787 / 874

Chapter 17 Hardware procedures 787
Passport 15000, 20000 Hardware Installation, Maintenance, and Upgrade 5.2S2
Replacing a cooling unit alarm cable
Replace a cooling unit alarm cable to restore proper reporting of temperature-
related alarms.
Prerequisites
• You must be familiar with “Safety considerations and best practices”
(page 53).
• You need cable assembly NTHR57 for the connection from either
alarm/BITS module to any version of the upper or lower cooling unit.
• You need cable assembly NTHR55 for the connection from the BIP to
any version of the upper or lower cooling unit.
Procedure steps
1 Note the path of the old cable as indicated in the figure “Connection paths
of the shelf alarm cables” (page 788).
2 Carefully cut the tie-wraps of the old cable assembly.
3 Using fingers only, unplug the ends of the old cable. Unplugging the cable
at either end generates software alarm 7012 0051 for the fans and the
temperature. This is normal during a replacement.
4 Plug in the lower connection of the new cable. The connector is keyed to
fit only one way.
5 Route the cable along the noted path, loosely fastening tie-wraps.
6 Plug in the other end (also fits one way). Plugging in both ends of the
cable ends the software alarms.
7 Balance the cable slack and tighten the tie-wraps. Cut off the tie-wrap
tails.