Device Board Interface

The Device Board Interface provides a signaling and restart interface between MX-ONE Service Node and the Device boards in the 1U/3U/7U subracks, and a PCM interface between Device boards and the TDM switch on MGU2. This interface is also used for on-board provided functions that are implemented as “virtual boards”, like the Digital E1/T1 Trunk (see ELU31 Blocking). Virtual boards is a way to emulate older Device boards but with new Hardware.

The MGU2 supports a propriety device board interface using 2Mbit HDLC and/or 128Kbit UART for signaling, and 2Mbit PCM for circuit switched media (32 x 64kbps timeslots) per device board position. Up to 16 device boards can be supported. The older UART protocol with slow signaling supported by DSU is not supported by MGU2.