Preparation (Modules)
21
in the case of a power failure. This telephone remains
operational on the external S
0
port and can be used
for external calls. It receives its emergency power
directly from the central office.
Switching Terminators
Caution: Electrostatic charges can destroy sensitive
components.
씮
Only a skilled electrician may open the casing and
perform installation work within an open casing.
씮
Divert electrostatic charges from yourself before
touching the circuit boards with your hands or any
tools. To do this, touch a metal object, preferably
earthed, e. g. the earthing terminal of the PBX or
a computer housing.
Requirements
– Previous system planning
– The following is a list of uses for the port in question
(for enabling the terminators):
The PBX port in question is located at the
beginning/end of a series of devices, for example,
when laying an internal S
0
bus in one direction.
The PBX port in question is only connected to one
device, for example, in a direct connection to an
NTBA with a PBX connection.
– The following is a list of uses for the port in question
(for disabling the terminators):
The PBX port in question is located in the middle
of a series of devices, for example, when laying an
internal S
0
bus in two directions.
The PBX port in question is connected to an
existing socket, for example, to an NTBA with an
external S
0
bus with terminators in the last socket.
Steps to Take
1.
Switch on: Push both buttons on the DIP switch to be
switched to the “on” position. See
.
Switching off: Push both buttons on the DIP switch to
be switched to the “off” position. See
.
S
0
external
S
0
internal
Fig. 6: Jumper setting on the COMmander 4S
0
module (rev. 2)
S
0
external
S
0
internal
Fig. 7: Jumper setting on the COMmander 4S
0
module (rev. 3) and COMmander 8S
0
module
Fig. 8: Switch setting on the S
0
module
Enabled
Disabled
Summary of Contents for COMmander Basic.2
Page 2: ......
Page 83: ......
Page 84: ...884285 05 04 11 For the sake of the environment 100 recycled paper...