Multi-Tech Systems MTA128NT User Manual
Page 6
Introduction and Description
MTA128ST/NT
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.
Terminal
Terminal
Terminal
NT2
(PBX)
NT1
Point “S”
4-8 Wires
Point “S”
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.
n
i
P
l
a
n
g
i
S
E
T
1
d
e
s
u
t
o
N
2
d
e
s
u
t
o
N
3
+
x
T
4
-
x
R
5
+
x
R
6
-
x
T
7
d
e
s
u
t
o
N
8
d
e
s
u
t
o
N