This read-write object sets the unit's operating mode: unframed(0), EDMAC Framing(1), or EDMAC-2 Framing(2). EDMAC framing overlays an embedded management channel onto the data stream, letting the modem carry auxiliary management/monitoring data, like remote alarm status, alongside the payload traffic without a separate physical channel, so this must be enabled, and matched at both ends of the link, before features depending on it, like cdm570EDMACMode or cdm570AUPCEnable, which explicitly requires framing to be enabled first, can function. An admin wanting to use AUPC on a previously unframed link must first change this from unframed(0) to one of the EDMAC framing modes before AUPC can be successfully enabled.