ISDN Interfaces
RBSU/RBSS and TBSU Interface Units
16-24
Strata DK I&M 6/00
A cord of up to 10 meters connects the ISDN BRI RJ45 wall jack to the desktop TE-1 or TA RJ45
jack. Bellcore recommends that all TE-1 and TA devices be attached with the same standard cord
to ensure compatibility.
Figure 16-14 Modular ISDN Data Cable
The standard pinouts for ISDN jacks is the TIA-568A or TIA-568B jack as listed in
.
The variants A and B to the TIA specification are electrically the same, only the wire colors are
different. However, you should only use one type TIA jack in a customer installation because
mixing the two may cause certain wire pairs to be swapped which would result in line faults.
Table 16-14 TIA-568B (RJ45) Jack – ISDN Standard Interface Modular Connector Pinout (RBSU-NT mode)
Notes
●
Pins are numbered left to right when looking into the jack cavity with the locking tab down.
●
TIA-568A swaps pair two with pair three, changing only the color of the wires on the pins.
Electrical performance is the same.
Pin
Color
Name
Function
1
Green
T2
Power 3 (not used on DK TBSU or RBSU/RBSS)
2
Green/White
R2
Power 3 (not used on DK TBSU or RBSU/RBSS)
3
Orange/White
R3
RX+
4
Blue/White
R1
TX+
5
Blue
T1
TX-
6
Orange
T3
RX-
7
Brown
T4
- Power 2 (not used on DK TBSU or RBSU/RBSS)
8
Brown/White
R4
+ Power 2 (not used on DK TBSU or RBSU/RBSS)
3039
Four-pair Wire
RJ-45
Eight-pole Plug
Locking Tab
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