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 1184535G3 Data Networking Overview
DS1 Circuit Emulation Module multiplexes/demultiplexes 84 DS1s to/from 84 VT1.5s. DS1s are packetized into pseudowires and transmitted over an optical or copper Gigabit Ethernet interface