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Architecture
Signaling interface
Interconnection
Microprocessor
The signaling interface performs an 8 Kbps signaling for all 24 channels and
interfaces directly to the DS-30X link. Messages in both directions of
transmission are three bytes long.
The interconnection to the carrier is by NTBK04 1.5Mb carrier cable
(A0394216).
The NTBK04 is twenty feet long. The NT8D97AX, a fifty-foot extension, is
also available if required.
The NTRB21 is equipped with bit-slice microprocessors that handle the
following major tasks:
•
Task handler: also referred to as an executive, the task handler provides
orderly per-channel task execution to maintain real-time task ordering
constraints.
•
Transmit voice: 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
NTRB21 DTI/PRI/DCH TMDI card
Option 11C and 11C Mini
Page 461 of 544
Technical Reference Guide
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