Physical description 1055
Toprovide CEMUX communication with the card, changes are also required
to create an I/O entry for the card.
This card replaces the NTAK09described in "NTAK09 1.5 Mb DTI/PRI card"
(page 859). The TMDI feature does not affect the NTAK09functionality. 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 GatewayExpansion. Up to four digital trunks are supported in
each Media Gateway. The NTRB21 card can be installedin slots 1, 2, 3,
and 4 of the Media Gateway.
ATTENTION
IMPORTANT!
Each Media Gatewaythat has adigital trunk must use a clock controller clocked
to an external reference clock.
Note: Clocking slips can occur between Media Gateways that are
clocked from differentCOs, if theCOs 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-layerpr inted
circuit board with buried power and ground layers.The clock controller
daughterboard is fastened by standoffs and connectors.
The NTRB21 card has seven faceplateLEDs. The first five LEDs are
associated with the NTRB21 card. The remaining two LEDs are associated
with the clock controller and DCHI daughterboards. See Figure 300
"NTRB21 TMDI card with clock controller" (page 1056).
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23May 2008
Copyright© 2003-2008, Nor tel Networks
.