Cisco GS7000 Installation And Operation Manual page 169

Configuration Examples
The following illustration shows a cassette style O-Band demultiplexer configuration
of the expanded fiber tray.
Using the O-Band demultiplexer in the expanded fiber tray, the four multiplexed
13xx multi-wave forward path signals are demultiplexed and feed into the four
individual receiver modules to achieve 4x forward segmentation with a single fiber.
Note: This solution requires an O-Band multiplexer at the headend as shown in the
following illustration.
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