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Appendix C — Pinouts and Cable Specifications
RJ-45 to RJ-21 Pinouts (Amphenol to Modular Jack)
The Amphenol modular 50-pin connector establishes connections
to the 8-pin modular jack through the network (hub) and distribu-
tion (house) punchdown blocks as illustrated in Figure C-1. Wire
jacket colors may vary.
Figure C-1 RJ-45 to RJ-21 Pinouts
1 TD + White/Blue
2 TD - Blue/White
3 RD + White/Orange
6 RD - Orange/White
1 TD + White/Green
2 TD - Green/White
3 RD + White/Brown
6 RD - Brown/White
1 TD + White/Silver
2 TD - Silver/White
3 RD + Red/Blue
6 RD - Blue/Red
1 TD + Red/Orange
2 TD - Orange/Red
3 RD + Red/Green
6 RD - Green/Red
1 TD + Red/Brown
2 TD - Brown/Red
3 RD + Red/Silver
6 RD - Silver/Red
1 TD + Black/Blue
2 TD - Blue/Black
3 RD + Black/Orange
6 RD - Orange/Black
1 TD + Black/Green
2 TD - Green/Black
3 RD + Black/Brown
6 RD - Brown/Black
1 TD + Black/Silver
2 TD - Silver/Black
3 RD + Yellow/Blue
6 RD - Blue/Yellow
1 TD + Yellow/Orange
2 TD - Orange/Yellow
3 RD + Yellow/Green
6 RD - Green/Yellow
1 TD + Yellow/Brown
2 TD - Brown/Yellow
3 RD + Yellow/Silver
6 RD - Silver/Yellow
1 TD + Violet/Blue
2 TD - Blue/Violet
3 RD + Violet/Orange
6 RD - Orange/Violet
1 TD + Violet/Green
2 TD - Green/Violet
3 RD + Violet/Brown
6 RD - Brown/Violet
Violet/Silver
No Connection Silver/Violet
No Connection
Port 1
Port 2
Port 3
Port 4
Port 5
Port 6
Port 7
Port 8
Port 9
Port 10
Port 11
Port 12
RJ-45
Connector
66 Type
Block
RJ-21 Connector
(Amphenol)
26
1
50
25
50