Nortel Meridian 1 Manual page 28

Page 24 of 44 E&M tie trunk circuit card
Supplement to 553-3011-210
Machines supported
The NT5K19BA E&M Tie trunk card supports the following types of
announcement machines:
• Start mode announcement machines
• Continuous mode announcement machines.
Recorded announcers supported include the Cook Digital 4-channel
announcer and the Audichron HQI-112.
Start mode
In start mode, the E&M 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 -9 dBm (in 600Ω) adjustable to a level of 10
dBm.
To start the announcement, the NT5K19BA E&M Tie trunk card provides a
momentary ground signal (150 ms) to the source. The announcement
machine should then start playing its message.
The NT5K19BA 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 1 shows recorded announcement in start mode.
Provisional 1.3 July 1993