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

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 NTBK50 2.0 Mb PRI 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.
Note: Clocking slips can occur between MG 1000S systems that are 
clocked from different Central Offices (COs), if the COs are not 
synchronized. The slips can degrade voice quality.
Physical description
The NTBK50 uses a standard 9.5" by 12.5" multi-layer printed circuit board. 
The faceplate is 7/8” wide and contains seven LEDs. See Figure 163 on 
IMPORTANT!
Each MG 1000S that has a digital trunk must have a clock controller 
clocked to an external reference clock.