Nortel Networks Video Gaming Accessories 553-3001-211 Manual De Usuario

 NTBK50 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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support of National and International bits in timeslot 0

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clock controller daughterboard

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D-channel interface daughterboard

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downloadable D-channel handler daughterboard

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32 software-selectable Tx and 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

The main functional blocks of the NTBK50 architecture are:

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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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clock controller interface

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Card-LAN / echo / test port interface

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80C51FA Microcontroller

NTBK50 interfaces to one DS-30X bus which contains 32-byte interleaved 
timeslots operating at 2.56 Mb. Each timeslot contains 10 bits in A10