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5.4
Removal and Replacement Of Sub-Units
5.4.1
Cards
Single card type modules may be removed and replaced with the system
powered or unpowered using card ejectors. When replacing cards, care should
be taken to push them fully home. All cards will work on the 1336 extender
board.
5.4.2
PSUs
Module type 1124, a mains powered switch mode power supply, housed within
the frame provides +5V for the switcher cards and control card. It may be
supplied configured for 110 Vac or 220/240 Vac, selected by a link internal to
the PSU.
A 'power on' LED is housed on the power supply front panel in addition to a
socket at the rear which allows external monitoring of both power supply
modules.
Outputs of the 1124 power supply are via diodes, allowing the inclusion of a
second power supply within the frame to provide back up power.
5.4.3
Sub-Assemblies
Sub-assemblies are secured at the rear of the frame by screws and care should
be taken during removal and replacement to support the boards and not to
stress leads. Remove cable connections from the motherboard by holding the
connector shell, not pulling the wires.
5.5
Installation Note
On this unit all 'destination' connectors must be wired to the controller
equipment, and all 'source' to the tributary equipment. The pinouts of these
connectors are such that for direct point-to-point connection between the router
and other equipment a pin to pin cable may be used (e.g. IDC ribbon).
6521
Page 8
6521
ISS 3 DEC 97
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