Parameters Common To All Mic/Line Input Types; Input Surveillance Tone Detection Configuration - ASL INTERCOM VAR4 Operation Manual

7.2

Parameters Common to All Mic/Line Input Types

7.2.1

Input Surveillance Tone Detection Configuration

The VAR Router is able to detect the presence of a low frequency surveillance tone, nominally 20Hz, on the
Mic/Line inputs. ASL microphones generate this tone as standard. If this surveillance is enabled, then in the
absence of a surveillance tone, an Input Audio fault will be raised and logged.
The surveillance tone detection can be enabled or disabled per input, and the detection threshold is
adjustable per input, as described in the following steps.
1. Select Configuration System Router Inputs Mic/Line.
2. Scroll the Mic/Line input list and select the required input:
[I/P #01 – MIC/LINE 01]
Default value: input 1
Possible inputs: 01 to 04 for VAR4
01 to 12 for VAR12
01 to 20 for VAR20
Note: The input name is shown on the right side of the display. The input name above is the Mic/Line
input 1 default name, however this may have been changed according to each site's
configuration.
3. The configured Mic/Line type is displayed.
The input type may be changed, as described in Section
4. Press the SELECT key to display the next sub-menu.
5. Move to, and select the Audio menu item, which is shown in different positions for different input types
as follows:
'Paging Microphone' and 'Zoned Fire Microphone'
Buttons [Audio] Ctrl
'Single Button Microphone'
PTT [Audio] Ctrl
'Fire Microphone' and 'Miscellaneous Input'
[Audio] Ctrl
'Network Channel'
[Audio] Name
6. Move to, and select the Surv menu item.
[Surv] EQ Fade
VAR4 / VAR12 / VAR20 - Operation Manual
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"7.1 Mic/Line Input Type
Page 75 of 308
Configuration".