Fan Assembly; Power Supplies; Backplane - Cisco ONS 15540 ESP Hardware Installation Manual

Chapter 1 Product Overview

Fan Assembly

Power Supplies

Backplane

78-15095-01
The Cisco ONS 15540 fan assembly is located at the bottom of the chassis and is
horizontally orientated. Air is drawn in by the fans from the bottom front of the
chassis and is exhausted through the vertically mounted modules and through the
top back of the chassis. The fan assembly is hot-swappable.
Fan status is reported to the processor cards.
LEDs describing the alarm reports for the fan assembly.
The external power supply is a single-phase, AC-DC, 1050W, -48V 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.
When the chassis is used in the telco environment, DC-input power is directly
powered to the chassis through the terminal blocks. The power supply is Ernestine
with 52 volts and 1050 watts output.
Redundancy
See the "Powering Up the Shelf" section on page 2-26
the power supplies.
The Cisco ONS 15540 optical backplane has no active components and uses a
cable of single mode fibers. The power connectors on the modules connect to the
electrical backplane allowing modules to draw up to 100W of power. The
backplane used on the chassis provides the optical connections between the line
card motherboards and their attached transponder modules on the client side and
the mux/demux motherboards and modules on the trunk side.
Refer to the Cisco ONS 15540 ESP Planning and Design Guide for more
information about the optical backplane and slot mapping.
Table 2-1 on page 2-26
Cisco ONS 15540 ESP Hardware Installation Guide
Cisco ONS 15540 Chassis
lists the
for more information about
1-3