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Cisco ONS 15540 ESPx Hardware Installation Guide
78-16436-01
Chapter 1 Product Overview
Cisco ONS 15540 ESPx Components
PSMs
The PSM (protection switch module) provides trunk fiber protection for Cisco
ONS 15540 ESPx systems configured in point-to-point topologies. The PSM
sends the DWDM signal from the mux/demux modules to both the west and east
directions. It receives both the west and east signals and sends one to the
mux/demux module. When a trunk fiber cut occurs on the active path, the PSM
switches the received signal to the standby path. The PSM can protect up to 32
data channels and the OSC.
The PSM also has an optical monitor port for testing the west and east receive
signals. This port samples 10 percent of these signals, which can be monitored
with an optical power meter.
One PSM can be installed in any slot of a mux/demux motherboard on the Cisco
ONS 15540 ESPx chassis.
The PSM has the same dimensions as the OADM channels used in the Cisco ONS
15540 ESPx. The front panel has four dual MU connectors, and the module
internally consists of two boards interconnected through a board-to-board right
angle connector. One board (called the generic optics module) contains the optics
and sensitive analog circuitry, and the other board contains the logic and system
interface board. (See
TX
Solid green
OSC is present and the optical laser output is enabled.
Off
OSC is not present and the optical laser output is disabled.
RX
Solid green
OSC is present and the optical data stream is received.
Off
OSC is not present and the optical data stream is not received.
1
Channel 1 IN OUT ports
5
Channel 3 IN OUT ports
2
Channel 1 LED
6
Channel 3 LED
3
Channel 2 IN OUT ports
7
Channel 4 IN OUT ports
4
Channel 2 LED
8
Channel 4 LED
Table 1-8
Mux/Demux Motherboard with OSC LEDs (continued)
LED
Status
Description
