D2.8 Circuit Operation M8SL2-00-002-812
© Copyright Tait Electronics Limited August 2004. All rights reserved.
• Alarm Pips (including Line Fail) – Cleared by “Clear Alarms” command only if
confirmation pips are not ‘active’. Always cleared by “Clear Alarm/Confirma-
tion Pip tones“ command.
• Confirmation Pips – Cleared by “Clear Alarm/Confirmation Pip tones” com-
mand.
Additionally, it is also possible to have a single auxiliary output assigned to more than
one alarm or confirmation. However, be aware that any command that resets auxiliary
outputs, such as “Clear Alarms” or “Toggle Auxiliary Output (x)”, will not make any
check for multiple use – auxiliary outputs will be reset regardless.
2.6 Voting Tone Operation
When the T803 is programmed to generate a tone on idle, the microprocessor monitors
the receiver Mute-In signal. When it is high (receiver muted) the DSP is instructed to
generate a voting tone to Line-Out. When receiver Mute-In is low the voting tone is
turned off. To prevent false detection of the idle tone at the far end voting equipment,
the DSP filters energy at the idle tone frequency from the receiver audio transmitted to
Line-Out.
If the T803 is programmed to generate a Sliding (or Simoco compatible) Voting Tone the
microprocessor reads the receiver RSSI level every 6ms using the A/D converter and
sends this value to the DSP. The DSP generates a voting tone to Line-Out. The tone fre-
quency is proportional to the RSSI level. To prevent incorrect operation of the far end
voting equipment, the DSP low pass filters the receiver audio transmitted to Line-Out.
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