ADTRAN 1205288L1 M3C3FDWATD Controller Card for MX2800 is a plug-in controller module (with modem) designed for the ADTRAN MX2800 M13 multiplexer. The L1 variant is described as a spare controller card that includes DS3 support and 28 DSX-1 interfaces, enabling DS3/T3-level service integration within the MX2800. In MX2800 deployments, two controller cards (A and B) provide 1:1 redundancy to protect against controller-card failure and allow seamless failover. This card handles DS3 and DSX-1 traffic as part of the M13 multiplexer’s TDM service path, supporting DS3/STS-1 over a T3 interface.
