Drops OC-3 with three STS-1 paths or one STS-3c path from the OMM module(s)Redundant (1+1) or non-redundant operationUnidirectional Line and Path APS in ADD directionSection, Line, STS-1, and VT1.5 path monitoring and path alarm surveillanceHot swap capabilityCentrally managed by the System Controller Module (SCM)