Mike's PBX Cookbook

BCM-50 Main Unit Wiring


BCM50 Main Unit

Main Unit Amphenol Wiring

You can connect 4 analog telephone lines, 4 analog telephony devices, and 12 digital telephones to the Main Unit.

RJ-21 telephony connector wiring

Pair Pin Wires Colour Type of device Line/DN
1 26/1 White/Blue Line 061
2 27/2 White/Orange Line 062
3 28/3 White/Green Line 063
4 29/4 White/Brown Line 064
5 30/5 White/Slate Analog Station 233
6 31/6 Red/Blue Analog Station 234
7 32/7 Red/Orange Analog Station 235
8 33/8 Red/Green Analog Station 236
9 34/9 Red/Brown No Connection  
10 35/10 Red/Slate Auxiliary Ringer Contacts  
11 36/11 Black/Blue External Paging Contacts  
12 37/12 Black/Orange External Paging Audio  
13 38/13 Black/Green Music-On-Hold  
14 39/14 Black/Brown Digital Station 232
15 40/15 Black/Slate Digital Station 231
16 41/16 Yellow/Blue Digital Station 230
17 42/17 Yellow/Orange Digital Station 229
18 43/18 Yellow/Green Digital Station 228
19 44/19 Yellow/Brown Digital Station 227
20 45/20 Yellow/Slate Digital Station 226
21 46/21 Violet/Blue Digital Station 225
22 47/22 Violet/Orange Digital Station 224
23 48/23 Violet/Green Digital Station 223
24 49/24 Violet/Brown Digital Station 222
25 50/25 Violet/Slate Digital Station 221

Home » Bcm » 50 Rj21