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 1184531L1 Data Networking Overview
OPTI-6100 Dual-Port Gigabit Ethernet Optical Module maps/demaps up to 1.2 Gbps (STS-24 rate) between the backplane and two front-access optical Gigabit Ethernet (GigE) ports.