Appendix A; Rj-21 Telephony Connector Wiring Chart - Nortel BCM50 Installation And Maintenance Manual

Appendix A

RJ-21 telephony connector wiring chart

You can connect 4 analog telephone lines, 4 analog telephony devices, and 12 digital telephones to
the RJ-21 telephony connector.
Figure 79 shows the RJ-21 telephony connector on a BCM50.
Figure 79 RJ-21 telephony connector on a BCM50
Table 34 lists the wiring details for the RJ-21 telephony connector.
Table 34 RJ-21 telephony connector wiring (Sheet 1 of 2)
Device Pin Connection
26 Tip
1
1 Ring
27 Tip
2
2 Ring
28 Tip
3
3 Ring
29 Tip
4
4 Ring
30 Tip
5
5 Ring
31 Tip
6
6 Ring
32 Tip
7
7 Ring
33 Tip
8
8 Ring
Appendix A RJ-21 telephony connector wiring chart
Main Unit
RJ-21 telephony connector
Wire color
White-Blue
Blue-White
White-Orange
Orange-White
White-Green
Green-White
White-Brown
Brown-White
White-Slate
Analog telephone
Slate-White
Red-Blue
Analog telephone
Blue-Red
Red-Orange
Analog telephone
Orange-Red
Red-Green
Analog telephone
Green-Red
Type of device Default DN
Analog line
Analog line
Analog line
Analog line
BCM50 Installation and Maintenance Guide
RJ-21 telephony
connector pin out
Default line
number
— 061
— 062
— 063
— 064
233 —
234 —
235 —
236 —
205