Nortel Networks Circuit Card User Manual
Page 752 of 906
NTAK79 2.0 Mb PRI card
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monitoring of receive carrier alarms including AIS, LOS, and RAI
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transmission of remote alarm when instructed
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slip-buffering receive messages
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supporting National and International bits in time slot 0
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on-board clock controller
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onboard D-channel interface
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32 software-selectable Tx & Rx Pad values
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conversion of PCM commanding Laws (A-A, u-u, A-u, u-A)
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Card-LAN for maintenance communication
Architecture
The main functional blocks of the NTAK79 architecture include:
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DS-30X interface
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A07 signaling interface
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digital pad
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carrier interface
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CEPT transceiver
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SLIP control
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D-channel support interface
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8031 microcontroller
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Card-LAN / echo / test port interface
DS-30X interface
The NTAK79 interfaces to one DS-30X bus which contains 32
byte-interleaved timeslots operating at 2.56 Mb. Each timeslot contains
10 bits in A10 message format; eight are assigned to voice/data (64 kbps),
one to signaling (8 kbps), and one is a data valid bit (8 kbps).
byte-interleaved timeslots operating at 2.56 Mb. Each timeslot contains
10 bits in A10 message format; eight are assigned to voice/data (64 kbps),
one to signaling (8 kbps), and one is a data valid bit (8 kbps).