Architecture 1069
The interconnection to the carrier is by NTBK04, a 1.5 Mb 20 ft. carrier
cable. The NT8D97AX, a fifty-foot extension cable, is also available.
Microprocessor
The NTRB21 is equipped with bit-slice microprocessors that handle the
following major tasks:
•Taskhandler : also referred to as an executive. The task handler
provides orderly per-channel task execution to maintain real-time task
ordering constraints.
•Transmitvoice: inserts digital pads, manipulates transmit AB bits for
DS1, and provides graceful entry into T-Link data mode when the data
module connected to the DTI/PRI trunk is answering the call.
•Receive voice: inserts digital pads and provides graceful entry into
T-Link data mode when the data module connected to the DTI/PRI trunk
is originating the call.
•T-Link data: a set of transmit and receive vectored subroutines which
provides T-Link protocol conversion to and from the DM-DM protocol.
•Receive ABCD filtering: filters and debounces the receive ABCD bits
and provides change of state information to the system.
•Diagnostics
•Self-test
The NTRB21 is equipped with bit-slice microprocessors that handle the
following major tasks:
•Taskhandler: also referredto as an executive, the task handler provides
orderly per-channel task execution to maintain real-time task ordering
constraints.
•Transmitvoice: inserts digital pads, manipulates transmit AB bits for
DS1, and provides graceful entry into T-Link data mode when the data
module connected to the DTI/PRI trunk is answering the call.
•Receive voice: inserts digital pads and provides graceful entry into
T-Link data mode when the data module connected to the DTI/PRI trunk
is originating the call.
•T-Link data: a set of transmit and receive vectored subroutines which
provides T-Link protocol conversion to/from the DM-DM protocol.
•Receive ABCD filtering: filters and debounces the receive ABCD bits
and provides change of state information to the system.
•Diagnostics
•Self-test
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright© 2003-2008, Nor tel Networks
.