NT5K19 Analog Tie Trunk Card 3-13
UK Trunk cards description 553-3001-173
Recorded Announcement/Music trunk operation
When used in the Recorded Announcement/Music mode, the trunk circuit
is connected to a customer provided recorded announcement machine or a
music source.
The NT5K19 Analog Tie trunk card supports the following announcement
machines:
•
Start mode announcement machines
(for example, Code-A-Phone)
•
Continuous mode announcement machines
(for example, Audichron)
Start mode
In start mode, the Analog Tie trunk card provides a startpulse to the
announcement machine to begin playback of the message. The
announcement source requires the following:
•
an impedance of 4 ohms or less
•
ground to the trunk unit when playing and an open circuit when idle.
This is done through a control lead to the trunk circuit.
•
default signal level of -9dBm (in 600
Ω
) adjustable to a level of 10
dBm.
To start the announcement, the NT5K19 Analog Tie trunk card provides a
momentary ground signal (150 ms) to the source. The announcement
machine should then start playing its message.
The NT5K19 trunk card expects status information from the announcement
machine, that is, whether it is idle or playing. For this reason, the
announcement machine requires a control lead to the trunk circuit.
Figure 3-1 shows recorded announcement in start mode.
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