VAR4 / VAR12 / VAR20 - Operation Manual
sue: 03 complete, approved
Is
Page 185 of 308
An ASL amplifier connected to this input requires the pulse interval to be set to 20 seconds, as
described in Section “6.3.4.2.3 Configuring an Amplifier’s AC Surveillance Interval”.
Default value: ‘−12’
• [Mode=Pulsed]
A pulsed surveillance tone with 20 seconds pulse interval is generated at the selected output.
Default value: ‘Mode=Pulsed’
5. Move to, and scroll the possible tone levels until the required value is displayed in the right field:
Mode=Pulsed [Level(dB)-12]
Possible values: −40 to 0dB (1dB steps)
Note: In a typical ASL system, the normal settings would be: ‘Pulsed’ and ‘−12dB’.
6. Save the changes by pressing the SELECT key, or cancel by pressing the BACK key.
When the system’s AC surveillance is being set-up, the surveillance tone produced by the
VAR Router is made continuous even if set to pulsed. This is because the amplifier
surveillance system needs a continuous signal to acquire its surveillance tone thresholds.
When the set-up menu is exited, the tone automatically returns to pulsed operation.
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