Nortel Networks Circuit Card 311 - Manual (Page 934)

934 NTAK79 2.0 Mb PRI card
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.
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
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).
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. The DS-30X timeslot number is mapped to the PCM-30 channel
number. Timeslots 0 and 16 are currently unused for PCM.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
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