Nortel 7400 Hardware Installation page 164

164 Chapter 28 Function processor upgrade
NN10600-175 6.1S2
CAUTION
Risk of equipment damage from software
An incompatible software load can damage an FP
beyond a field repair. Ensure that the software running
on the device meets the minimum software requirement
for an FP. For more information, see NN10600-551
Nortel Networks Multiservice Switch 7400/15000/20000
FP Configuration Reference.
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
FPs in the sparing configuration.
• See "Unpacking a processor card" (page 539) for FP and CP handling
instructions.
• Some FPs are incompatible with FPs of the same type but different
vintages. Some FPs are incompatible with FPs of a different type in the
same shelf. The DS1 or E1 MSA 1-slot FPs can replace or spare the
equivalent 2-slot FPs (or vice versa). Ensure that the FPs you are going
to add do not conflict with other FPs already in service. For more
information about operational compatibilities, see NN10600-551 Nortel
Networks Multiservice Switch 7400/15000/20000 FP Configuration
Reference for the descriptions of your FP selection.
• When an FP is in a sparing configuration, either replace the mate with the
same vintage or ensure that the FP's capabilities are compatible and
preferably exceed those of the mate. A sparing configuration with
mismatched versions operates with only the common shared
functionality.