NT5K19 Analog Tie Trunk Card 3-15
UK Trunk cards description 553-3001-173
Figure 3-2
Recorded announcement - continuous mode
GND
Open
Announcement Duration
Control Pulse
from RAN machine
GND (Make Busy)
Open (Normal)
Busy Signal
from RAN machine
150-300 ms
Music source
The music source should provide an impedance of 600
Ω
. The default
signalling level should be -9dBm (in 600
Ω
) adjustable to a level of 10
dBm.
Paging trunk operation
When used in the paging mode, the trunk circuit is connected to a
customer-provided paging amplifier system. When accessed, the circuit
card will provide a loop closure. In a typical application, the loop closure
will cut off a music supply and switch the paging trunk transmission path
to the paging amplifier.
Emergency Recorder (RCD) operation
The interface to an emergency recorder (RCD) unit is the same as to that of
a RAN unit in continuous mode. The recorders must be voice activated,
since the Meridian 1 does not supply the recorder with a start pulse when
the trunk is in use.
The transmission path provided by the Meridian 1 is bothway. If warning
tone needs to be applied, it can be supplied by the recording device.
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