ADTRAN 1205288L2 MX2800 Controller w/ out Modem THE TOTAL ACCESS MX2800 CONTROLLER CARD (CCU) IS A PLUG-IN UNIT FOR THE MX2800 CHASSIS THAT PROVIDES 1:1 REDUNDANCY FOR THE T1 AND T3 SIGNALS AS WELL AS THE T3 CONNECTIONS.
WITH TWO CARDS INSTALLED THE MX2800 CAN RECOVER FROM CIRCUIT FAILURE.