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52
Service Functions, Problem Solving
Service Functions, Problem Solving
The case may only be opened by authorized personnel
e
Installation work with open case or services involving the
keys inside the case are only allowed to be executed by
1
authorized personnel
.
The green power LED (hardware LED) shows only that the PBX is con-
nected to the 230 Volt mains. This meaning will not change.
The meaning of the other five LEDS of the PBX is marked on the blue
case cover in its default condition (that means without clicking the keys).
The LED „ISDN ready" signals the external S
page
52).
The LED „ISDN busy" displays information about the exchange line
status (see
page
52).
The LED „Message" signals the availability of messages (see
page
53).
The LED „Remote" displays information about remote programming
(see
page
53).
The LED „Data" displays information about the USB connection
(see
page
53).
The LED „Data" displays also information during power-on (see
page
53).
Symbol Definitions
LED flashes.
LED glows.
1
.
Default Information Status of the LED Display
bus monitoring (see
0
1. Authorized personnel: These are persons that are trained for this purpose (e.g.
certified electricians). They must have the necessary knowledge about the
work in an area with potentially hazardous voltage. They must also have the
knowledge about the latest electrical safety standards and requirements.
ISDN ready: Testing external S
If you established a connection to the NT, the LED „ISDN ready" will
show the functional condition of the external S
If this function is not usable with public exchanges outside of
Germany, it can be switched off in COMset.
ISDN
Message Remote Data
ready
busy
ISDN busy: Information about the Exchange Line Sta-
tus
The LED „ISDN busy" reflects the traffic status on the external S
ISDN
Message Remote Data
ready
busy
2. In the ISDN definition a so-called layer model is used in order to describe cer-
tain conditions of the communication protocol. In order to establish a connec-
tion, a setup of the layers 1 to 3 is necessary. The layer 1 (bit transmission lay-
er) is providing the physical transmission of raw data.
Ports
0
2
ports (layer 1 active)
.
0
All the existing exter-
nal S
ports are ready
0
Power
for operation.
One of two possible
external S
ports are
0
not ready for opera-
tion.
(only for COMpact
4410 USB with two
external S
ports).
0
No external S
port
0
can be activated.
ports.
0
All existing
B channels are busy.
Power
(At least) one
B channel is free.
All the existing
B channels are free.
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