Nortel Networks Video Gaming Accessories 553-3001-211 Manual De Usuario

 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).

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.

Each MG 1000S that has a digital trunk must have a clock controller 

clocked to an external reference clock.