20
Connect the PBX to the NT
For the external connection to the ISDN, one or more NT with the Euro-
pean protocol DSS1 (Euro-ISDN) are necessary.
The external S
0
ports of the PBX are designed for the following types of
connections:
왎
ISDN Basic rate as Point-to-Point connection.
왎
ISDN Basic rate as Point-to-multipoint connection.
If the NT is next to the PBX, you put one end of the enclosed ISDN cable
into the western modular jack of the PBX with the labelling „S
0
1 ext.“
and the other end in one of the western modular jacks of the NT
(
). The termination resistors must be switched on in the NT as
well as for the corresponding S
0
port of the PBX.
As there are some differences depending on the kind of con-
nection – PTP connection or PTMP connection – referring to
the NT, please observe the following differences:
It is possible to operate only one ISDN device on one NT with PTP con-
nection that means only the PBX in our case. All additional ISDN
devices have to be operated as internal subscriber of the PBX.
It is permitted to operate multiple ISDN device on one NT with a PTMP
connection. If there are additional devices directly connected to the NT
in parallel to the PBX the 230 Volt power supply of the NT must be
plugged in. If the PBX is connected exclusively to the NT, you may leave
the NT unpowered in order to save energy.
Install Wall Jacks (External S
0
Bus)
1st variant (
): If the NT is in a longer distance to the PBX, it is
necessary to use fixed wiring with an ISDN wall jack at the end (external
S
0
bus). One end of the enclosed ISDN cable is put into the western
modular jack of the PBX with the labelling „S
0
1 ext.“ and the other end
into the ISDN wall jack. The termination resistors in the NT must be
switched on. On the other end, the termination resistors are built into the
ISDN wall jack.
Advice concerning the cables and ISDN wall jacks to be used as well as
the assignment is similar to the wiring of an internal S
0
-bus and can be
found in (
2nd variant with COMpact 2S
0
Module (
): If you
extended your COMpact 4410 USB with a COMpact 2S
0
Module and
you configured the switchable S
0
port as an external S
0
port, you may
use the 4-pole connection clamp of this S0 port on the module. Connect
these with the clamps in the NT. The termination resistors must be
switched on in the NT as well as on the corresponding S
0
port of the
PBX. The maximum distance between NT and PBX may be
왎
1000 m for a Point-to-Point connection
150 m for a Point-to-Multipoint connection
Advice concerning the cables and ISDN wall jacks to be used
as well as the assignment will be found in the
lation of Wall Jacks (internal S0 Port) on page 21
.
Connect the PBX to the NT
☞
☞
Pic. 13: Direct connection to the NT
NT
Pic. 14: Connection to an external S
0
bus
NT
Summary of Contents for COMpact 2206 USB
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