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Internal S0 port (AS 32) ¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢
You may connect up to eight ISDN terminals
to one internal S0 access of the telephone
system.
ISDN terminals:
- AGFEO system telephones digital
- ISDN telephones
- ISDN cards
- ISDN fax machines
Depending on current consumption, you
may connect at least four ISDN terminals
that do not have a power supply of their
own.
Example: 4 ISDN telephones or 2 system
telephones digital and 2 ISDN telephones.
The ISDN terminals must operate in accord-
ance with the DSS1 protocol.
In case you want to connect several ISDN
terminals to the internal S0 plug, you have
to install an S0 bus with several sockets.
You connect this bus via a 4 wire srew clip.
You need the following material to install an
internal S0 port:
- Telecommunications cable; we recom-
mend the cable type I-Y (St) Y 2 x 2 x 0.6
- IAE or UAE connection sockets; up to 12
sockets
- Terminators, 100 Ohm, load carrying ca-
pacity 0.25 watt, 2 terminators
An internal S0 bus may be 130 m long (dis-
tance from the telephone to the last IAE /
UAE socket).
You have to terminate the internal S0 bus.
Add two 100 Ohm terminators to the last
IAE/UAE connection socket (drawing 4).
Drawing 4:
Wiring an internal S0 port
Wire pair 1
red
b1 black
Wire pair 2
a2 white
b2 yellow
Pay attention dur-
ing installation to
the enumeration of
the UAE sockets.
Do not confuse a2
with b2 or a1 with
b1 !
100
Ω
Wire pair 1: a1, b1
Wire pair 2: a2, b2
b1
b2
a1
a2
S
0
- internal
100
Ω
Max. distance
130 m S
0
-bus
1
UAE
2 3 4 5
6
7 8
1
UAE
2 3 4 5 6 7 8
1
UAE
2 3 4 5 6 7 8
1
UAE
2 3 4 5 6
7
8
b1
b2
a1
a2
S
0
- internal
100
Ω
100
Ω
IAE
1a 1b
2a 2b
IAE
1a 1b
2a 2b
IAE
1a 1b
2a 2b
IAE
1a 1b
2a 2b
