Hi Gilbert,
A DC connector is supplied in the CMU kit. Compatible DC connectors are also available from three manufacturers:
Molex: 395305004
Tyco: 4-796634-4
Phoenix Contact: 1757035
The CMU requires either a mains power supply (with the AC to DC power supply convertor available from Cambium) or a -48 V dc power supply.
The -48 V dc supply must have over current protection that does not exceed 3 amps.
The -48 V dc supply must be positive ground or isolated.