Nortel 7400 Hardware Installation page 351

• When you are using custom-made FP cables instead of the prefabricated
cables provided by Nortel Networks, see "Making customer equipment
cables" (page 382).
• When connecting cables in a spared configuration involving a sparing
panel, complete the main connections first, and then the spare
connections.
• For figures showing the cable connections between an FP and its
termination panel, sparing panel, or the far end, see NN10600-172 Nortel
Networks Multiservice Switch 7400 FP Cabling Reference.
• The fanout cables and fanout cable adapter for the 32-port DS1 or E1
MSA 1-slot FPs has connectors of different sizes and the cables are split.
To understand how the user ports are divided between each branch, refer
to their description in NN10600-170 Nortel Networks Multiservice
Switch 7400 Hardware Description.
• FP cable connectors engage the faceplates in different ways. Some are
oriented by keyway guides, shape, size, or mechanism, and engagement
actions vary. For example, D-sub connectors with a sliding latch or the
two screws look similar but engage and disengage very differently.
Multiservice Switch 7400 Hardware Installation, Maintenance, and Upgrade 6.1S2
Chapter 39 Hardware procedures 351
CAUTION
Risk of service loss
Whenever you install an FP that uses a control cable, in
a sparing configuration, you must always insert the FP
into a slot on the shelf before you connect the control
cable. If you connect the control cable between the FP
and the termination or sparing panel before you insert
the FP in the shelf, you can disrupt service to the other
FP(s) in the sparing configuration.
CAUTION
Risk of service loss
Before connecting any cables to an FP, ensure that it is
properly seated. Seating a cabled FP can cause a traffic
loss on the other FPs in the sparing configuration.