Equipment protection via redundant (1:1) modulesAMI and B8ZS encodingESF, SF, SLC96, and unframed framing formatsAuto frame format sensingIn-band and out-of-band (ESF-FDL) controlled loopbacksTiming can be supplied to or derived from the OMM (Optical Multiplexer Modules)Hot swap capabilityAuto in-service timer