Nortel Passport 15000, Установка и обслуживание оборудования, Страница: 807 / 874

Chapter 17 Hardware procedures 807
Passport 15000, 20000 Hardware Installation, Maintenance, and Upgrade 5.2S2
Replacing an alarm cable assembly to the alarm/BITS
module
Replace an alarm cable assembly to the alarm/BITS module to restore
reporting of shelf alarm data to the CPs.
Prerequisites
• You must be familiar with “Safety considerations and best practices”
(page 53).
• The figure “A typical alarm cable assembly” (page 808) applies to the
cable assemblies NTHR55, NTHR56, and NTHR57. The pinouts of the
cables differ but the method of replacement is the same.
Procedure steps
1 Note the path of the old cable. See the figure
• “Connection points of the cables for an alarm/BITS module in a
Passport 15000” (page 809)
• “Connection points of the cables for an alarm/BITS module in a
Passport 20000” (page 810)
2 Inform the software network operator that disconnecting the cable to
replace it will temporarily generate software alarms. For information about
BITS alarms, refer to 241-5701-500
Passport 6400, 7400, 15000, 20000
Alarms.
3 Starting at the BIP, unplug the ends of the old cable. Unplugging either
end of the cable at J2 generates software alarms for high temperature and
a fan failure. No alarm is generated for unplugging J1. This is normal
during a replacement.
4 Plug in the connector of the replacement cable and fasten the D-sub
connector screws.
5 Route the cable along the noted path, loosely fastening tie-wraps.
6 Plug in the other end at the BIP. Plugging in both ends of the cable
enables the reporting of the alarms to resume.
7 Balance the cable slack along the cable management brackets and
snugly tighten the tie-wraps. Cut off the tie-wrap tails.