The Adtran OPTI-MX module provides a DS3 or EC1 tributary payload from the OPTI-MX system. The signal is made available through one of the in and out BNC pairs on the OPTI-MX chassis.
Adtran 1184502L10 Data Networking Overview
The 1-Port OC-3 Optical Multiplexer Module, Remote Terminal (OMM3SR) terminates the OC-3 fiber circuit(s) from an OMM3SC module (P/N 1184502L9) to feed the OPTI-6100 chassis.