Cisco GS7000 Installation And Operation Manual page 57

Reverse Configuration Module
4x4 Reverse Configuration Module with Auxiliary Reverse RF Injection
Description
The 4x4 Reverse Configuration Module with auxiliary reverse RF injection routes
reverse inputs from Port 1 to Transmitter 1, from Port 2/3 to Transmitter 2, from
Port 4 to Transmitter 3, and from Port 5/6 to Transmitter 4. An RF signal from an
external source can optionally be injected and coupled with reverse RF inputs from
Ports 3/6 and routed to Transmitter 1.
Note: This module is typically installed when using EDR multiplexing digital
reverse modules. Since the digital reverse module occupies the physical space that
transmitters 3 and 4 normally occupy in the node base, this reverse configuration
module is typically used with a 6-port optical interface board.
The following diagram shows how this module functions.
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