We use a 4-position-4-conductor modular jack for supplying DC power to our ~400 different SKUs (electronic signal buffers). We typically use two pins for +8.5 V and -8.5 V, with one pin for Ground.

Kycon's latest modular jack for telecommunications and LAN applications features integrated LEDs that provide easy identification of transmit/receive and line status. The LEDs are available in green ...