Nortel-networks Circuit Card Manual de usuario Pagina 778

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Page 778 of 906 NTBK50 2.0 Mb PRI card
553-3001-211 Standard 3.00 August 2005
monitoring of receive carrier alarms including AIS, LOS, and RAI
transmission of remote alarm when instructed
slip-buffering receive messages
support of National and International bits in timeslot 0
clock controller daughterboard
D-channel interface daughterboard
downloadable D-channel handler daughterboard
32 software-selectable Tx and Rx Pad values
conversion of PCM commanding Laws (A-A, u-u, A-u, u-A)
Card-LAN for maintenance communication
Architecture
The main functional blocks of the NTBK50 architecture are:
DS-30X interface
A07 signaling interface
digital pad
carrier interface
CEPT transceiver
•SLIP control
D-channel support interface
clock controller interface
Card-LAN / echo / test port interface
80C51FA Microcontroller
DS-30X interface
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
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