3 connectors, 1 frame ground connector (gnd), 2 power connector – Multi-Tech Systems DataTalker DT101/xx User Manual
Page 39: 3 data/command connector, 4 external composite rs232c/v.35 connector, 5 voice/fax channel 1 fxs connector, 6 voice/fax channel 1 fxo connector, Connectors, Frame ground connector (gnd), Power connector

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