Toshiba CTX28 manual Rx+, Tx+

ISDN Interfaces

RBSU/RBSS Interface Units

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.

Locking Tab

3039

Four-pair Wire

RJ-45

Eight-pole Plug

Figure 7-15 Modular ISDN Data Cable

The standard pinouts for ISDN jacks is the TIA-568A or TIA-568B jack as listed in Table 7-11. 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 7-11 TIA-568B (RJ45) Jack – ISDN Standard Interface Modular Connector Pinout (RBSU- NT mode

Pin	Color	Name	Function
1	Green	T2	Power 3 (not used on RBSU/RBSS)
2	Green/White	R2	Power 3 (not used on 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 RBSU/RBSS)
8	Brown/White	R4	+ Power 2 (not used on RBSU/RBSS)

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.

7-22 Strata CTX I&M 06/04