Chapter 2 Theory of Operation
Optical Switch Module
Optical Switch Module Description
The optical switch module is used for switching the input of an EDFA module from
a primary signal to a backup or secondary signal. The switch operates in the 1550 nm
wavelength range since its application is high power/long haul systems that employ
EDFAs.
The switch has two operating modes: manual and automatic. In automatic mode, the
switch can be triggered by a loss of light. The loss of light activation triggers the
switch when the light level drops below the threshold value set by the operator. In
manual mode, the switch can be triggered through the Local Control Module (LCM).
The module mounts in receiver or transmitter slots on the optical interface board in
the node lid using a reversible pin adaptor. The pin adaptor is used to adapt the
module to the connector arrangement for a transmitter slot or a receiver slot, which
are different. To mount the module in a transmitter slot the red side of the pin
adaptor must face out. To mount the module in a receiver slot the blue side of the
pin adaptor must face out.
Refer to Optical Amplifier and Optical Switch Module Pin Adaptor (on page 128)
for pin adaptor installation instructions.
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