Cabling The Second Cooling Unit - Nortel Passport 15000 Hardware Installation And Maintenance

Cabling the second cooling unit

Prerequisites
Passport 15000, 20000 Hardware Installation, Maintenance, and Upgrade
Cable a second cooling unit to complete the installation when a second
Passport 15000 or 20000 switch is added to a NEBS 2000 frame.
• You must be familiar with "Safety considerations and best practices"
(page 53).
• Before connecting the cables at the second cooling unit, the cooling unit
and the second shelf assembly must already be installed.
• The cable assemblies for the second cooling unit are installed at the
factory whether the second cooling unit is present in the NEBS 2000
frame or not. The cable connectors at the BIP end are already plugged in.
The cable connectors for the second cooling unit are located at the rear
of the BIP, left side. Notice that the tie-wraps loosely hold the cables in
place.
• The second cooling unit power cable assemblies include:
— NTHR66 for the A and B power cables
— NTHR55 for the BIP alarm cable for the upper shelf
— NTHR57 for the cooling unit alarm cables
— NTHR5250 for the upper temperature sensors
• Cabling the second cooling unit involves plugging in the cables in the
appropriate connections on both the lower (front) and upper (rear)
cooling units. The second cooling unit has the same pattern of cables as
the lower (front) cooling unit. Use the lower cooling unit as an example
to cable the second (upper) cooling unit. See the figure "Power and alarm
cable paths between the BIP and cooling units" (page 257).
• Mount the alarm cable assembly for the second cooling unit even if the
second unit will be installed at a later date. Otherwise, the fans of the
lower cooling unit will run on high speed and the CP will receive a high
temperature alarm.
Chapter 17 Hardware procedures 255
5.2S2