Chapter 44: Ntrb21 Dti/Pri/Dch Tmdi Card - Avaya Nortel Communication Server 1000 Reference

NTRB21 DTI/PRI/DCH TMDI card
Note:
For CISPR B group cabinets, the active Clock Controller (NTAK20) can only occupy slots
1-3. For FCC and/or CISPR A group cabinets, this limitation does not exist - the Clock
Controller can occupy any available slot 1-9.
Note:
On non-ECM system cabinets, the NTAK20 can be placed in slots 1-9. On cabinets
NTAK11Dx and NTAK11Fx, the active NTAK20 must be placed in slots 1-3 (slots 4-10 cannot
be used).
Important:
Each Media Gateway that has a digital trunk must use a clock controller clocked to an
external reference clock.
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
652 Circuit Card Reference
Figure 196: NTRB21 TMDI card with clock controller
Comments? infodev@avaya.com
on page 653.
July 2011