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Crossover ISDN S/T Cable
Description
A 2BST interface card works in network termination (NT) mode and supports only voice services, but not data services. The 2BST interface card uses a crossover ISDN S/T cable (adapter cable). A straight-through cable can be used as an extension cable for the crossover ISDN S/T cable.
Structure and Pin Assignments
Figure 8-47 shows the structure of a crossover ISDN S/T cable.
Table 8-74 shows the pin assignments of a crossover ISDN S/T cable.
Table 8-74 Pin assignments of a crossover ISDN S/T cable
X1 (TE) |
Signal |
X2 (NT) |
|---|---|---|
1 |
- |
1 |
2 |
- |
2 |
3 |
Tx+ |
4 |
4 |
Rx+ |
3 |
5 |
Rx- |
6 |
6 |
Tx- |
5 |
7 |
- |
7 |
8 |
- |
8 |
In a crossover ISDN S/T cable, pins 4 and 5 are used to transmit signals, and pins 3 and 6 are used to receive signals.
Connection
A crossover ISDN S/T cable is connected as follows:
- The RJ45 male plug is connected to the ISDN interface on a 2BST interface card.
- The other RJ45 female socket is connected to a network device.
Ordering Information
Table 8-75 provides the crossover ISDN S/T cable ordering information.