Wiring below is standard straight through Type “B” wiring used in North America sometimes called the AT&T standard. Pins 1 (w/Orange) – Intercom (optional) 2 (Orange) – Intercom (optional) 3 (w/Green) – RX- 4 (Blue) – GND (DC-) 5 (w/Blue) – GND (DC-) 6 (Green) – RX+ 7 (w/Brown) – 5v or 12v + 8 (Brown) – 5v or 12v …