East Coast Datacom Nx8- Dual Composite MUX High-Speed 16-Port TDM Multiplexer, Operation Manual

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Nx64-MUX
Side inflow
Side outflow
Convection
(through unit)
Figure 11 Airflow around obstructions
3.2 Power Supply Modules
The power supply is a user-replaceable, plug-in module that furnishes DC power to the
system derived from the AC power source. All power buses that interconnect the system
modules are distributed via the internal backplane. Power supplies may be either single, or
1:1 redundant, depending on the type of system shipped.
In non-redundant power systems, the power supply module also has a system guide printed
on it‟s front panel to assist the operator in the relative location of the six modules and their
respective ports as viewed from the front of the system.
3.2.1 Power Supply Replacement
NOTE: Except for Redundant Power systems, AC power to the supply must be
disconnected prior to removing a power supply module from, or inserting a
power supply module into the main chassis.
The power supply may be removed by unlocking the plug-in module via the two front panel
locking screws, and pulling on the handle to slide the module out of the chassis.
Upon replacement of the power supply the user should insure that the power supply slide
rails are inserted into the rails on either side of the power supply slot position in the main
chassis. Once aligned in this way, the power supply may be pushed completely into the main
chassis. The power supply must then be securely fastened in place by tightening the two
front panel locking screws.
3.3 Processor Card
The processor card provides storage and execution of all programmable system and
multiplexing functions, except those related to the channel port electrical interfaces and
converters. The processor card maintains in its memory the program and configuration data
in non-volatile storage. Although power cycles will not result in loss of this data, replacement
of the processor card with another card will introduce the program and configuration stored
on the new card, which may be different from that stored on the original card.