Nortel Enterprise 1000 Reference Manual page 194

Page 194 of 236
553-3023-211 Standard 1.00 June 2001
NTRB21 DTI/PRI/DCH TMDI card
The TMDI feature introduces the software changes required for a Succession
CSE 1000 system to support the new TDMI pack. The software changes
include:
• the introduction of a new prompt to replace a function that was handled
by a dip switch on the NTAK09
• an extra loadware application to handle Layer 1
• change 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.
This card replaces the NTAK09 described in "NTAK09 1.5 Mb DTI/PRI
card" on page 133. The TMDI feature does not affect the NTAK09
functionality. The configuration and maintenance changes to the card are not
apparent to the user. Call processing is not affected.
The NTRB21 card is installed only in the Media Gateway. It is not supported
in the Media Gateway Expansion. Up to three digital trunks are supported in
each Media Gateway. The NTRB21 card can be installed in Slot 1, 2, and 3
of the Media Gateway.
Each Media Gateway that has a digital trunk must have a
clock controller clocked to an external reference clock.
Note: Clocking slips can occur between Media Gateways that are
clocked from different COs, if the COs are not synchronized. The slips
can cause degraded voice quality.
Contact your system supplier or your Nortel Networks representative to
verify that the NTRB21 digital trunk card is supported in your area.
IMPORTANT