Nortel Passport 15000, Hardware Installation And Maintenance, Page: 312 / 874

312 Chapter 17 Hardware procedures
241-1501-240 5.2S2
Connecting a temperature sensor cable assembly
Connect the upper temperature sensor cable assembly to enable monitoring
of the air flow temperature from the upper (front) cooling unit.
Prerequisites
• You must be familiar with “Safety considerations and best practices”
(page 53).
• You need a step ladder to see the top of an upper shelf assembly that is
mounted in a NEBS 2000 frame or other mounting apparatus.
Procedure steps
1 While facing the rear of the Passport 15000 or 20000, locate the
temperature sensor assembly under the BIP and on top of the shelf. See
the figure “Location of upper temperature sensors” (page 313).
2 Trace the cluster of red cables routed to the right side down to the
connector at the end.
3 Trace the cluster of red cables from the 3 sensors to the right side down
to the connector at the end. See the figure “Cable assembly connector on
a temperature sensor bracket assembly” (page 314).
4 Align the connector with the D-sub of the nearest red cable assembly from
the upper cooling unit. The cable assembly is labeled NTHR55.
5 Engage the D-sub connectors and fasten the small slotted captive
screws.
When the Passport Passport 15000 or 20000 is already powered, all 3
fans of the upper (front) cooling unit should start rotating at the lower
(normal) rpm speed.
6 Fasten the cable cluster with the provided tie-wraps to the inside of each
cable management bracket along the route. If there is any slack cable,
loop the cluster and fasten the loop closed without crimping the cable.
Have the loop occur in the middle of the vertical leg of cables.