Physical description – Nortel Networks 1000 User Manual
Page 955
Physical description
955
•
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
•
a change to the existing loadware files into 32 bit format from 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
. 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 four digital trunks are
supported in each Media Gateway. The NTRB21 card can be installed in
slots 1, 2, 3, and 4 of the Media Gateway.
ATTENTION
IMPORTANT!
Each Media Gateway that has a digital trunk must use 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 degrade voice quality.
Contact your system supplier or your Nortel Networks representative to
verify that the NTRB21 digital trunk card is supported in your area.
Physical description
The NTRB21 card uses a standard 9.5" by 12.5" multi-layer printed
circuit board with buried power and ground layers.The clock controller
daughterboard is fastened by standoffs and connectors.
The NTRB21 card has seven faceplate LEDs. The first five LEDs
are associated with the NTRB21 card. The remaining two LEDs are
associated with the clock controller and DCHI daughterboards. See
276 "NTRB21 TMDI card with clock controller" (page 956)
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311
02.06
Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.