Installation manual

Telco (RJ21) Connection Specification
50
Table 8 below gives a pin-out chart for the Telco connector.
Table 8: 50-Pin Telco Pin-Out
50-Pin
Connector
Pin Number
Punch-
Down Block
Pin Number
Cable
Color
Code
1
Link
Designation
Hub
8-Pin
Modular
Jack Pin
Numbers
26 1 W-BL 1 RCV POS 1
1 2 BL-W 1 RCV NEG 2
27 3 W-OR 1 XMT POS 3
2 4 OR-W 1 XMT NEG 6
28 5 W-GR 2 RCV POS 1
3 6 GR-W 2 RCV NEG 2
29 7 W-BR 2 XMT POS 3
4 8 BR-W 2 XMT NEG 6
30 9 W0SL 3 RCV POS 1
5 10 SL-W 3 RCV NEG 2
31 11 R-BL 3 XMT POS 3
6 12 BL-R 3 XMT NEG 6
32 13 R-OR 4 RCV POS 1
7 14 OR-R 4 RCV NEG 2
33 15 R-GR 4 XMT POS 3
8 16 GR-R 4 XMT NEG 6
34 17 R-BR 5 RCV POS 1
9 18 BR-R 5 RCV NEG 2
35 19 R-SL 5 XMT POS 3
10 20 SL-R 5 XMT NEG 6
36 21 BK-BL 6 RCV POS 1
11 22 BL-BK 6 RCV NEG 2
37 23 BK-OR 6 XMT POS 3
12 24 OR-BK 6 XMT NEG 6
38 25 BK-GR 7 RCV POS 1
13 26 GR-BK 7 RCV NEG 2
39 27 BK-BR 7 XMT POS 3
14 28 BR-BK 7 XMT NEG 6
NOTE 1. Cable colors may be different from those represented here, depending
on the cable manufacturer.