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Page 482 of 544 NTAK79 2.0 Mb PRI card
553-3011-100 Standard 14.00 January 2002
Environment
The NTAK79 meets all applicable Nortel Network’s operating specifications.
Architecture
The main functional blocks of the NTAK79 architecture include:
• DS-30X interface
• A07 signaling interface
• digital pad
• carrier interface
• CEPT transceiver
• SLIP control
• D-Channel support interface
• 8031 microcontroller
• Card-LAN / echo / test port interface
A description of each block follows.
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; 8 are assigned to voice/data (64 Kbps), one to signaling
(8 Kbps), and one is a data valid bit (8 Kbps).
The incoming serial bit stream is converted to 8-bit parallel bytes to be
directed to padding control.
The signaling bits are extracted and inserted by the A07 signaling interface
circuitry. Following is the mapping of the DS-30X timeslot number to the
PCM-30 channel number. Timeslots 0 and 16 are currently unused for PCM.