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22
Connection to the NT
For the connection to the ISDN, one or more NT with the European pro-
tocol DSS1 (Euro-ISDN) are necessary.
The external S
ports of the COMmander Basic are designed for the fol-
0
lowing kind of connections:
Basic connection as Point-to-Point connection.
Basic connection as Point-to-Multipoint connection.
As there are some differences depending on the kind of connection –
PTP connection or PTMP connection – referring to the NT, we subdi-
vided the text into the
chapter Connection to a Point-to-Point ISDN Line
on page 22
and
chapter Connection to a Point-to-Multipoint ISDN Line
on page
23.
Connection to a Point-to-Point ISDN Line
It is possible to operate only one ISDN device on one NT with PTP con-
nection that means only the COMmander Basic in our case. All addi-
tional ISDN devices are operated as internal subscriber of the
COMmander Basic.
1st option
(Pic. 26 on page
COMmander Basic, you put one end of the enclosed ISDN cable into
the western modular jack of the corresponding COMmander 4S
ule 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
port of the COMmander Basic.
0
2nd option
(Pic. 27 on page
23): If the NT is in a longer distance to the
COMmander Basic, it is necessary to us fixed wiring with an ISDN wall
jack at the end (external S
bus). One end of the enclosed ISDN cable
0
is put into the western modular jack of the corresponding
COMmander 4S
module and the other end into the ISDN wall jack. The
0
termination resistors in the NT must be switched on. On the other end,
the termination resistors are built into the ISDN wall jack
or on the S
port of the COMmander Basic the termination resistors
0
have to be switched on.
Advice concerning the cables and ISDN wall jacks to be used as well as
the assignment will be find in
Wall Jacks on page
20. The maximum distance between NT and
COMmander Basic may be 1000 m.
3rd option
(Pic.
25): If you configure one of the S
modular jack as an external S
0
nection clamp of this corresponding S0 port on the COMmander 4S
module. Connect these with the clamps in the NT. The termination re-
sistors must be switched on in the NT as well as on the corresponding
S
port of the COMmander Basic. Advice corresponding the cable to be
0
used can be learned in the
chapter Installation of additional ISDN Wall
Jacks on page
20. The maximum distance between NT and
COMmander Basic may be 1000 m.
Connection to the NT
23): If the NTBA is next to the
chapter Installation of additional ISDN
ports without western
0
port, you will have to use the 4-pole con-
mod-
0
Pic. 25: Direct wiring of NT
and COMmander Basic
0
b2 b1 a1 a2
b2 b1 a1 a2
NTBA
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