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Chapter 1
Product Overview
Power Supplies
Backplane
Alarm Cards
78-16436-01
The optional external power supply is a single-phase, AC-DC, 1050W, -48VDC
output power supply that connects to the chassis through terminal blocks. The
external power supply is installed in an external power shelf that fits into a
standard equipment rack. Up to three external power supplies can be installed in
the external power shelf.
See the
"Powering Up the Shelf" section on page 2-40
the power supplies.
The Cisco ONS 15540 ESPx uses an electrical backplane. The power connectors
on the modules connect to the electrical backplane allowing line card
motherboards to draw up to 100W of power. Optical connections between
transponder modules on the client side and the mux/demux modules on the trunk
side are made in the front.
The alarm signals from the processor card are sent to the alarm card attached to
the bottom of the backplane. They connect to the central office alarm through
connectors on the backplane.
The alarm card has relays and terminal blocks to interface the chassis to the Telco
Central Office alarm equipment. It is a separate card that mounts to the back of
the chassis and connects to the backplane.
There are six relays on the alarm card. They are audible and visible with three
levels for each type:
critical
•
major
•
minor
•
Each relay has two form C contacts. One is used to connect to the terminal block
and the outside. The other is used to provide feedback on the state of the relay.
Cisco ONS 15540 ESPx Hardware Installation Guide
Cisco ONS 15540 ESPx Chassis
for more information about
1-5
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