Nortel Circuit Card 311 Reference page 958

958 NTAK93 D-channel Handler Interface daughterboard
A total of 32K bytes of ROM space for each pair of ports is reserved as a
code section of the DCH-PORT firmware.
LAPD data link/asynchronous controller
One chip controls each pair of independent communication ports. It
performs the functions of serial-to-parallel and parallel-to-serial conversions,
error detection, and frame recognition (in HDLC). The parameters of these
functions are supplied by the DCH-PORT firmware.
One chip controls each pair of independent communication ports. It
performs the functions of serial-to-parallel and parallel-to-serial conversions,
error detection, frame recognition (in HDLC) function. The parameters of
these functions are supplied by the DCH-PORT firmware.
One chip controls each pair of independent communication ports. It
performs the functions of serial-to-parallel and parallel-to-serial conversions,
error detection, and frame recognition (in HDLC). The parameters of these
functions are supplied by the DCH-PORT firmware.
Counter/timer controller
Two chips are used as real-time timers and baud-rate generators for each
pair of communication ports.
Two chips are used as real-time timers and baud-rate generators for each
pair of communication ports.
Two chips are used as real-time timers and baud-rate generators for each
pair of communication ports.
Software interface circuit
This portion of the circuit handles address/data bus multiplexing, the
interchange of data, commands, and status between the on board
processors and software. It includes transmit buffer, receive buffer,
command register, and status register for each communication channel.
This portion of the circuit handles address/data bus multiplexing, the
interchange of data, commands, and status between the on board
processors and software. It includes transmit buffer, receive buffer,
command register, and status register for each communication channel.
This portion of the circuit handles address/data bus multiplexing, the
interchange of data, commands, and status between the on board
processors and software. It includes transmit buffer, receive buffer,
command register, and status register for each communication channel.
Copyright © 2003-2008, Nortel Networks
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Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008