Nortel Networks 553-3001-211 manual 814 of 894 NTRB21 DTI/PRI/DCH Tmdi card

Page 814 of 894 NTRB21 DTI/PRI/DCH TMDI card

To provide CEMUX communication with the card, changes are also required to create an I/O entry for the card.

You can install this card in slots 1 through 4 in the MG 1000S. The card is not supported in the MG 1000S Expansion. Up to four digital trunks are supported in each MG 1000S.

Note 1: 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 2: On non-ECM system cabinets, the NTAK20 may be placed in slots 1-9. On cabinets NTAK11Dx and NTAK11Fx, the active NTAK20 must be placed in slots 1-3 (slots 4-10 may not be used).

IMPORTANT!

Each MG 1000S that has a digital trunk must have 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 Figure 173.

553-3001-211 Standard 2.00 September 2004