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Switch Termination Resistors
The termination resistors for the internal and external S
switched on or off with help of the DIL switch on the circuit board.
If the corresponding S
port of the COMmander Basic is at the begin-
0
ning/end of several units or if there is only one connection between two
units, the appropriate termination resistors need to be activated. (see
Pic.
13).
This is the case e.g. if the COMmander Basic is connected directly to
the NTBA as a single device which is always the case with a PTP con-
nection. (Exception: An ISDN connection box with integrated terminal
resistors was switched in between).
The termination resistors needs to be activated (see
lay an internal S
bus to two directions starting at the corresponding
0
internal S
port.
0
But you also have to deactivate the termination resistors if you con-
nected an external S
bus directly to the NT with termination resistors
0
in the last connection box and if you connect the COMmander Basic to
one of these connection boxes.
In the individual installation chapters the different possibilities will be
explained in detail again. (see
the internal S0 Port on page 19
page
22).
Meanings of the Light-Emitting Diodes
On the western modular plugs of S
emitting diodes (see
Pic.
15). The light-emitting diodes show the activity
on the different S
ports.
0
LED glimmers:One B-channel is busy.
LED glows:Both B-channels are busy.
LED short flash:D-channel message received.
LED is flashing with 0,5 Hz:Layer 1 is activated.
In the extend of supply of the COMmander Basic is one
COMmander 4S
module enclosed. This contains 4 S
0
be connected alternatively as internal or external S
Select internal/external S0 Port on page
An S
port that was configured as an internal S
0
tures like an ISDN Point-to-Multipoint exchange line connection. Here
you can also connect up to eight ISDN units, a maximum of four of them
without an own power supply (that is the case with most of the ISDN tel-
ephones). All the devices should be certified Euro-ISDN devices in
order to guarantee a proper functionality.
On the S
ports 1 to 4 the connection of the ISDN devices is done via
0
attached ISDN wall jacks on the four clamps b2, b1, a1 and a2 (see
chapter Installation of additional ISDN Wall Jacks on page
use the S
port 1 or 3 as internal S
0
use the built-in western modular plugs. Thanks to this you will have a
direct connection between the COMmander Basic and an ISDN device
or an ISDN Multiplug.
ports are to be
0
Pic.
14) e.g. if you
chapter Connection of ISDN Devices to
and
chapter Connection to the NT on
port 1 and 3 you will find four light-
0
Connection of ISDN Devices to the internal S
ports that can
0
ports. (see
0
18).
port, offers similar fea-
0
Pic. 16: Connecting
20). If you
ports, you also have the option to
0
1
1
Pic. 15: S
LED of
LED of
LED of
LED of
The connection cable of an ISDN device may have a maximum length
of 10 m. It is equipped with a western plug that you will plug into the
chapter
ISDN wall jack (Western modular RJ-45) as you can see in
you like to remove the western plug out of the jack, you will have to
press the lever and pull at the same time to remove it.). In case of ISDN
devices with an own power supply you have to plug them into to the 230
V mains. Then all ISDN devices must be configured. (see
Configuration of ISDN Devices on page
An ISDN Device directly attached to the
COMmander Basic
If you only like to connect one single ISDN device to the internal S
you can use the western modular plug that is on the circuit board, pro-
viding that it is the S
longer than 10 m.
The S0 Module: Description and Connection
Pic. 13: Activated ter-
mination resistors
(On)
ON
2
Pic. 14: Deactivated
termination resistors
(Off)
ON
2
LEDs
0
S
port 1
0
S
port 2
0
S
port 3
0
S
port 4
0
Port
0
39).
port 1 or 3. The connection cable must not be
0
19
Pic.
16. (If
chapter
port,
0
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