Characteristics
5
Functional
The Analog Message Waiting Line Card contains a microprocessor that
provides the following functions:
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card self-identification
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self-test
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control card operation
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status report to the controller
-
diagnostics for maintenance purposes
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The Analog Message Waiting Line Card also provides the following:
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6OfIQ
balanced terminating impedance
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analog-to-digital and digital-to-analog conversion of transmission and
reception signals for 16 audio phone lines
-
transmission and reception of SSD signalling messages over a DS30X
signalling channel in A10 format
-
detection of on-hook/off-hook status and switchhook flash
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connection of 20 Hz ringing signal and automatic disconnection when
the station goes offbook
-
synchronization for connecting and disconnecting the ringing signal to
zero crossing of ringing voltage
-
loopback of SSD messages and PCM signals for diagnostic purposes
-
indication of board status with faceplate-mounted LED
Analog message waiting line card description 553-3001-l 63
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