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

 NT5D97 Dual-port DTI2/PRI2 card

If the EREF command is selected in LD 60, tracking on the primary or 
secondary reference clock is automatically switched in the following manner:

•

If software is unable to track on the assigned primary reference clock, it 
switches to the secondary reference clock and sends appropriate DTC 
maintenance messages.

•

If software is unable to track on the assigned secondary reference clock, 
it switches to free run.

Clock Controllers can be used in a single or a dual CPU system. 

A single CPU system has one Clock Controller card. This card can receive 
reference clocks from two sources referred to as the primary and secondary 
sources. These two sources can originate from a PRI2, DTI2, etc. PRI2 cards 
such as the NT8D72BA are capable of supplying two references of the same 
clock source. These are known as Ref1 (available at J1) and Ref2 (available 
at J2) on the NT8D72BA.

The NT5D97 card is capable of supplying two references from each clock 
source, for example, four references in total. NT5D97 can supply Clk0 and 
Clk1 from Unit 0 and Clk0 and Clk1 from Unit 1. Either Unit 0 or Unit 1 can 
originate primary source, as shown in Figure 75 through Figure 78.

There is one Clock Controller cable required for the DDP2 card, which is 
available in four sizes; this is the NTCG03AA/AB/AC/AD. Refer to 
“Reference clock cables” on 

 for more information.