Nortel Networks Circuit Card - Manual (Page 778)

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