Doc.No.: 03118-000-IS
Page 10 of 12
1000,1000 : frequency 1000 Hz, duration 1 second - Fourth short burst
0,1000 : frequency 0 (no tone), duration 1 second - Pause
1000,1000 : frequency 1000 Hz, duration 1 second - Fifth short burst
0,1000 : frequency 0 (no tone), duration 1 second - Pause
1000,1000 : frequency 1000 Hz, duration 1 second - Sixth short burst
0,1000 : frequency 0 (no tone), duration 1 second - Pause
1000,1000 : frequency 1000 Hz, duration 1 second - Seventh short pause
0,1000 : frequency 0 (no tone), duration 1 second - Pause
1000,7000 : frequency 1000 Hz, duration 7 seconds - Long burst
0,1000 : frequency 0 (no tone), duration 1 second - Pause
The system configuration file interpreter will automatically repeat the given sequence as long as the
General Alarm is running.
This tone frequency and curve form alteration facility is a configuration selection only open to
Zenitel or authorized personnel.
2.3 FEEDBACK / INTERFERENCE CANCELLATION
In cases where loudspeakers are place in the near proximity of the MPA 1601 / 1604 Control units
(microphones) there is a possibility of causing audible feedback making PA messages difficult or
impossible to interpret. The MPA 1600 PA/GA system has two different countermeasures in order to
deal with this. Either a local mute facility in each MPA 1601 Control Unit, or using a temporary
recording facility within the system in order to first make a record, then automatically replay the
message when finished. The latter is called speech delay and it is a configuration matter
2.3.1 Local Mute
In all Control Units, MPA 1601 / 1604 there is a “local mute” relay and related terminals. The local
loudspeakers object to the mute function must be connected through this relay. As long as the Control
unit is idle the relay are closed and all signal messages are passing through to the local loudspeakers.
Whenever the Control unit is active (PA / Emergency PA) the relay opens and the message is
disconnected from the loudspeaker and it is locally muted. Whenever the Control Units becomes idle
again the loudspeaker is reconnected.
For connection details: Ref. Document 03118-025-EC
2.3.2 Speech delay
The MPA 1600 system has a facility named speech delay. When this facility is enabled in the system
configuration, the MPA 1600 system will not immediately output the message when a PA or
Emergency PA announcement is activated, but start a temporary recording. When the PA / Emergency
PA announcement is finished the system automatically replays the message into the loudspeaker
network in the selected zones (according to the initiated zone selection).
The speech delay facility is selected individually per input during installation or previously in a FAT
situation. It is not object to any user selection. Once selected, it will be enabled for all messages
inserted through this input. It is not dependant of any special or additional connections within the
system.
The Speech delay is a configuration selection only open to Zenitel or authorized personnel.
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