ISDN Interfaces
RBUU/RBUS Interface Unit
5-28 Strata CTX I&M 10/02
• The ISDN BRI-U wire pair is usually on the center pair of the Demarc jack, pins 3 and 4 on
RJ11 and pins 4 and 5 on RJ45. Typical demarc jack wiring is shown below:
Figure 5-25 Six-pin Modular Plug (RJ11)
Table 5-9 Quad Cable with RJ11 Demarc Coding
Figure 5-26 Eight-pin Modular Plug (RJ45)
Conductor Color Pin Use
Pair 1
Red 3 Line 1
Green 4 Line 1
Pair 2
Yellow 5 Line 2/Power
Black 2 Line 2/Power
RJ11 Demarc Jack
4726
6
5
4
3
2
1
BLACK
RED
GREEN
YELLOW
RJ45 Demarc Jack
4727
1
2
3
4
5
6
7
8
WHITE-GREEN
GREEN
WHITE-ORANGE
BLUE
WHITE-BLUE
ORANGE
WHITE-BROWN
BROWN
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