Service Functions, Troubleshooting
ISDN Devices
71
If you like to connect an additional device, please contact your spe-
cialized dealer or your skilled electrician. If an S
0
bus is connected to
the internal S
0
port, there are often more connecting boxes than units
but you will need a new internal telephone number for the new device.
This must be configured.
If you like to replace one device by another (e.g. telephone by tele-
phone or ISDN PC-controller by ISDN PC-controller), you will also
have to pay attention to the fact that a maximum of four devices per
S
0
port may get their voltage supply out of the PBX. All the devices
should be certified Euro-ISDN units in order to guarantee a proper
functionality.
The connecting cable of an ISDN device may have a maximum
length of 10 m. It is equipped with a Western plug that you plug into
the ISDN wall jack as shown in
. (If you like to unplug the West-
ern plug out of the wall jack again, you will have to press the lever in
order to remove it). In case of self powered ISDN devices you have
to connect the power supply with the 230 Volt mains.
Then you must enter the MSN into the new unit (see instruction man-
ual of the telephone). This MSN must match with an MSN configured
with COMset for the internal S
0
port.
The functional richness of the PBX makes it sometimes possible that
a function is started unintentionally and by mistake (e.g. by dialling a
wrong number sequence). It is also possible that you dialled an incor-
rect programming sequence and start a function that has an unknown
effect to you.
Or you have no knowledge about the authorizations and rights of the
subscribers.
Sometimes problems that are suspected to be in the PBX are actually
problems located in the telephone (e.g. ringer switched off, no MSN
entered). There might also be problems with power failures or the
exchange lines.
The following chapters will assist you in finding minor problems your-
self. If you are still not finding a solution here, please contact your
dealer or your skilled electrician.
Various tones in the receiver are signalling various operating modes
of the PBX.
At the end of a programming you hear e.g. the acknowledge tone as
a prove of successful execution. If you hear a busy tone, it indicates
that there was an error during the operation or a missing authoriza-
tion.
The internal dial tone after picking up the receiver or after pressing
the FLASH- or R-key is signalling that you can start to dial a number.
You are not hearing a Dial Tone after Picking up the Receiver
햲
Please check the wiring and plugs. Please also check the tele-
phone.
햳
If you have this problem with an ISDN telephone, you did not
enter the corresponding internal telephone number as first MSN
into the telephone. Try to correct this problem. Make sure that this
MSN is presented to the PBX later (see manual of the telephone).
햴
Disconnect the telephone from the PBX for 5 seconds and an
eventually existing external power supply (Pull the plug). If the
problem is solved, the telephone had a malfunction.
햵
If this problem exist for all internal telephones, check whether
there is a power outage or whether the power plug of the PBX has
been removed from the socket. If not, contact your authorized
dealer or your skilled electrician.
Your are hearing the Busy Tone after picking up the Receiver on
a Direct Exchange Line Telephone
햲
All available public exchange lines are busy.
You are hearing a pulsating Tone (Special Dial Tone) after
Picking up the Receiver
햲
Eventually a subscriber Call Forwarding has been configured for
the telephone. You can switch this function off, if unwanted
(
).
햳
Eventually a Do-not-Disturb service has been configured for the
telephone. You can switch this function off, if unwanted (
햴
Please check, if the filling status of the call data memory has
exceeded 80%.
You are hearing a pulsating Tone (Special Dial Tone) for 2
seconds after Picking up the Receiver
햲
An automatic dialling has been configured for the telephone. You
can switch this function off, if unwanted (see
).
Learn Flash Timing
b ##8*98*FF #
ISDN Devices
Frequent Problem Sources
Fig. 1: Connecting
You are hearing an unexpected Tone