Nortel Passport 15000, Установка и обслуживание оборудования, Страница: 315 / 874

Chapter 17 Hardware procedures 315
Passport 15000, 20000 Hardware Installation, Maintenance, and Upgrade 5.2S2
Connecting alarm cables to the alarm/BITS module
Connect alarm cables to the alarm/BITS module to enable the BIP alarm and
cooling unit alarm.
Prerequisites
• The cable assemblies may already be installed. If not, they must be
added.
• The PECs for the alarm cable assemblies are
— NTHR55 for the BIP alarm to the upper alarms/BITS module
— NTHR56 for the BIP alarm to the lower alarms/BITS module
— NTHR57 for each cooling unit alarm to the alarms/BITS module
• The cable assembly NTHR57 has eight wires between connectors. A
Passport 15000 uses four of the wires while a Passport 20000 uses all
eight. The former version of the cable assembly had four wires. Both
versions have the same connectors and cable length. The cable assembly
with eight wires can replace one with four wires with no effect on
performance or operation. The 4-wire version cannot replace the 8-wire
version. For connection information, see the table “Pinout of the alarm
cable assembly from NTHR57” (page 316).
• See the location of the cable connections in the figure “Connection points
of the cables for an alarm/BITS module in a Passport 15000” (page 318)
and “Connection points of the cables for an alarm/BITS module in a
Passport 20000” (page 319).
Procedure steps
1 At the rear of the BIP, locate the 26-pin female D-sub connector labeled
P7 (for lower unit) or P9 (for upper unit). See the figure “Locations of the
alarm cable connectors and paths” (page 317).
2 Connect one end of the BIP alarm cable to that D-sub connector.
3 Route the cable to the right along the strain-relief bar, fastening snugly
with tie-wraps every 15 cm (6 in.).
4 Route the cable down the right side of the frame against the cable
management brackets.