1 - 7
S400
Switches closed
Switches open
Achtung!
Vor dem Öffnen Netzstecker ziehen.
Caution!
Disconnect power cord, before remove
cover.
S401
S400
S401
RS 232C -
Schnittstelle
b7
a7
b8
a8
NF
U~
TFE
S0-Anschluß
extern
BE
X16
externe
MoH
X15
X2
X3
X4
X5
X8
R42
R41
R32
R31
Relais 1 bis 4
R22
R21
R12
R11
b5
a5
b6
a6
X6
Port 5
X7
X11
b2
a2
X10
b3
a3
db3
da3
X9
b4
a4
db4
da4
db2
da2
+24 V
X14
a2
b2
a1
b1
S0-Anschluß
intern
GND
GND
Port 1
X12
da1
db1
a1
b1
Port 2
Port3
Port 4
Port 6
Port 7
Port 8
External fixed S0 port (Western socket) ¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢
Point-to-point connection
You can only connect one ISDN telephone
system to an ISDN point-to-point connec-
tion. You cannot connect any further ISDN
terminals.
By means of the ISDN connecting cable,
connect the ISDN system directly to the
NTBA or to an ISDN socket (IAE/UAE) that is
connected to the NTBA.
Terminators for the external S0 port
The two
switches S400 and S401
for the
100 Ohm terminators, which must belong to
one connecting line, must be closed for the
point-to-point connection.
Point-to-multipoint connection
The point-to-multipoint connection may
consist of an S0 bus. Up to 12 ISDN sockets
(IAE/UAE) may belong to this ISDN bus. Be-
sides the ISDN telephone system, you can
connect up to seven further ISDN terminals
to the S0 bus.
Terminators for the external S0 port
For the point-to-multipoint connection, the
two switches S400 and S401 for the 100
Ohm terminators, which must belong to
one S0 connecting line, must be
-
closed
if the external S0 port is con-
nected directly to the NT or to the last
IAE/UAE socket and the 100 Ohm termi-
nators in the socket are not connected,
-
open
if the 100 Ohm terminators in the
last IAE/UAE socket are connected
or the telephone system is not the last
ISDN terminal on the point-to-multipoint
connection.
By means of the connecting cable, connect
the ISDN telephone system to an ISDN
socket of the S0 bus.
If the point-to-multipoint connection does
not consist of an S0 bus, you can connect
the ISDN telephone system directly to the
NT.
Drawing 3:
Switches S400 / S401 (Termination)
