User guide

Chapter 2 - Installation

MT128ISA/PCI

Terminal

NT2

(PBX)

NT1

Point “S”

4-8 Wires

Point “S”

Point “T”

4-8 Wires

Point “U”

2 Wires

Figure 2-1 ISDN Interface Points

S/T Interface

The S/T interface uses an 8-conductor modular cable terminated with an 8-pin RJ-45 plug. An 8-pin

RJ-45 jack located on the terminal is used to connect the terminal to the DSL (Digital Subscriber

Loops) using this modular cable.

Table 2-1 shows the Pin Number, Terminal Pin Signal Name and SILC Pin Signal name for the S/T

interface.

Pin Number Terminal Pin Signal Name SILC Pin Signal Name

1 Power Source 3 Not applicable

2 Power Source 3 Not applicable

3 Tx+ Rx+

4 Rx+ Tx+

5 Rx- Tx-

6 Tx- Rx-

7 Power Sink 2 (-) Not applicable

8 Power Sink 2(+) Not applicable

Table 2-1. S/T Interface Connector Specification

U Interface

The U interface uses a 2-conductor twisted pair cable terminated with an RJ-45 jack. An RJ-45 jack

located on the terminal is used to connect the terminal to the Digital Subscriber Loops using this

twisted pair cable.

In Table 2-2 the Pin Number, Terminal Pin Signal Name and UILC Pin Signal Names for the U inter-

face are listed.

Pin Number Terminal Pin Signal Name UILC Pin Signal Name

1 Not Used Not applicable

2 Not Used Not applicable

3 Not Used Not applicable

4 Tip or Ring Tip or Ring

5 Tip or Ring Tip or Ring

6 Not Used Not applicable

7 Not Used Not applicable

8 Not Used Not applicable

Table 2-2. U Interface Connector Specification