Overview; Functional Description - Meridian Nortel 1 Option 11C Technical Reference Manual

Page 456 of 544

Overview

Functional description

553-3011-100 Standard 14.00
NTRB21 DTI/PRI/DCH TMDI card
The NTRB21 TMDI (DTI/PRI/DCH) card is required to implement PRI on
the Meridian 1 Option 11C system. It is supported in the Main and IP
expansion cabinets.
The TMDI feature introduces the software changes required for an
Option 11C system to support the new TDMI pack. These changes include
the introduction of a new prompt to replace a function that was handled by a
dip switch on the NTAK09, as well as an extra loadware application to handle
Layer 1, and changes to make the existing loadware files into 32 bit format
instead of the original 16 bit format. To provide CEMUX communication
with the card, changes are also required to create an I/O entry for the card. In
addition the NTRB21 has a built-in downloadable D-channel.
This card requires that the Option 11C be equipped with at least Release 24
software.
This card replaces the NTAK09 described in "NTAK09 1.5 Mb DTI/PRI
card" on page 447. This feature does not affect the NTAK09 functionality,
configuration, or maintenance in any way. Aside from changes to the
configuration and maintenance of the pack, there are no other changes seen
by the users, and call processing is not affected.
NTRB21 provides the following features and functions:
• configurable parameters, including A/µ-Law operation, digital pads on a
per channel basis, and Superframe or Extended Superframe formats
• AMI or B8ZS line coding
• 1.5 Mb Digital Trunk Interface and 1.5 Mb Primary Rate Interface
• 1.5 Mb Clock recovery and distribution of reference clocks
• DG2 or FDL yellow alarm methods
• card status and alarm indication with faceplate-mounted LED
• automatic alarm monitoring and handling
• Card-LAN for maintenance communications
• loopback capabilities for both near end and far end
January 2002