Nortel Passport 15000, Установка и обслуживание оборудования, Страница: 795 / 874

Chapter 17 Hardware procedures 795
Passport 15000, 20000 Hardware Installation, Maintenance, and Upgrade 5.2S2
Replacing a local operator terminal cable
Replace a local operator terminal cable to restore communication to the CP
of a Passport 15000 or 20000.
Prerequisites
• You must be familiar with “Safety considerations and best practices”
(page 53).
• The RS232 port on a CP2 or a CP3 connects the Passport 15000 or 20000
to a local operator terminal.
• For any CP, the PEC of the cable for the RS232 port is NTBP25.
Procedure steps
1 Locate the cable to be replaced at port P1.
2 Measure the exact length of the cable to be replaced to ensure that the
replacement will reach both terminations. See the figure “Route of a CP
cable” (page 784).
3 Using the part number labels, match a duplicate of the old cable to a pre-
assembled cable from Nortel Networks, or if making a cable, match
quality, ratings, length, and the connectors at either end. The existing
cable sheath has identification markings on it. If making the cable, add the
connectors according to the manufacturer’s instructions.
4 Route the replacement cable parallel to the cable bundle that has the
older cable being replaced. Fasten the middle span of the replacement
cable independently from the older cable.
5 Coordinate with the operator of the local terminal that its communication
is about to be dropped.
6 Unplug the old cable at each end and immediately plug in the new cable.
7 Cut the connectors off the end of the old cable. If tugging or pulling on the
older cable can affect the operation of any other cable, leave the old cable
in position unless it can be easily removed.