Nortel Networks Option 11C User Manual
Page 482 of 544
NTAK79 2.0 Mb PRI card
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).
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.
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.
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.