Interfaces and Terminals as of I7.8
24
System Interfaces
sy
d-
023
9/2.
4
– I7.
8
– 0
7
.2009
2. 1. 4
Analogue Network Interfaces
The analogue network interfaces support DTMF and pulse dialling. A range of pa-
rameters in the System Configurations allows country-specific adaptations to the
public network as well as other settings. The table below shows the configuration
options available:
System configuration
Tab. 8
Analogue network interfaces: System configuration
Parameter
Parameter value
Remarks
Behind PBX
[
Yes / No
]
See
"Analogue down-circuit connection", page 26
Line Attenuation
[
short / long / short D /
long D
]
See
"Attenuation on analogue network interfaces", page 28
Dialling mode
[
PULSE / DTMF
]
DTMF dialling should be used in preference whenever both
dialling types are supported.
Ringing cycle
[5..0.60 s]
With incoming calls the internal ringing signal is discontinued
if the time between each ringing signal on the exchange line is
longer than the configured ringing cycle. This is the case for
example when the external caller hangs up.
Dialling tone detec-
tion
[
Yes / No
]
If
Yes
, the PBX waits for the dial tone from the exchange before
starting to dial.
Dialling tone time
[0..0.1200 s]
Maximum waiting time for the exchange dial tone if exchange
dial tone detection is activated. After that, the PBX switches
over to the next free trunk line. If dial tone detection is deacti-
vated, dialling begins after the set time, even without an
exchange dial tone.
International dial-
ling tone
[
Yes / No
]
If
Yes
, the dialling process is interrupted after one of 10 prede-
fined digit sequences to wait for the international dialling tone.
Exchange digit bar-
ring
[
No international dial-
ling tone
or 1…10]
If the trunk line is configured to
Behind PBX
(analogue down-
circuit connection), the exchange access prefix of the up-cir-
cuit PBX has to be entered in the exchange digit barring.
Release signal
[
Yes / No
]
In most cases the public network sends the PBX a release signal
whenever the external user ends the call. If the parameter is
configured as
Yes
, the connection is then cleared down by the
PBX (see also the "Clearing Down Exchange-to-Exchange Con-
nections" Chapter in the "System Functions and Features" Sys-
tem Manual).
Release signal type
[
Loop-break / Polarity
reversal / Congestion
tone
Note:
Polarity reversal and congestion tone is supported only by
A150 and A300.
Congestion tone
level
[
High / Low
]
The sound level of the congestion tone can vary greatly within
a country and depending on the line length. With this setting
the detection can be adapted to the existing level.