Multi Tech Equipment MTA128ST - Manual (Page 6)

Introduction and Description
6
If your ISDN product operates with a S/T outlet interface, you need an NT1 device to connect to the ISDN
switch. MTA128ST adapters need an NT1 device to connect to the ISDN switch, but the MTA128NT
adapter does not require NT1 device. In the UK, and in many European countries, NT1 device is supplied by
your telephone company.
Figure 2-1 ISDN Interface Points
S/T Interlace
The S/T interface uses an 8-conductor modular cable terminated with an 8-pin RJ-45 plug. An 8-pin RJ45
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 TE Signal
1 Not used
2 Not used
3 Tx+
4 Rx-
5 Rx+
6 Tx-
7 Not
used
8 Not used
U Interlace
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 interface are listed.
Pin
1 N/A
2 N/A
3 N/A
4 Positive
Input
5 Negative Input
6 N/A
7 N/A
8 N/A