C-12 SmartSwi tch 18 00 4.0 U ser Gui de, Rev 01
PTT/Telco Connectors and Cabling
Figure C-7 RJ45 C on necto r Pins
The RJ45 connector on a SmartSwitch 1800 is mainly used for E&M operation. An
RJ45 cable is include d with e ach SmartS witch 180 0. The ca ble en d with the co nnector
plugs into the SmartSwitch, and the end with bare wire connects to a telco/PTT type
punch block. The cable is color-coded as described in the following table.
The RJ45 cable can also be used to provide the two-wire connection. For these appli-
cations, only the red and green wires (pins 4 and 5) are active; the other wires should
be insulated with electrical tape to prevent unwanted connections.
Table C-1 RJ45 Cable Connections
Pin Color Usage Description
1 Gray SB Return for M Signal
2 Orange M Control Signal from PBX
3 Black TR Voice from PBX (T r ans m i t Ring)
4 Red RR Voi ce to PB X (Rec eive Rin g) two -wire co nnectio n
5 Green RT Voice to PBX (Receive Tip) two- wire connection
6 Yellow TT Voice from PBX (Transmit Tip)
7 Blue E Control Sign al to PBX
8 Brown SG Return for E Signal