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Architecture 353
Clock configurations
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 97 "Clock Controller - Option
1" (page 355) through Figure 100 "Clock Controller - Option 4" (page 358).
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" (page 337) for more information.
Table 161 "Clock Controller options - summary" (page 353) summarizes the
clocking options. Table 162 "Clock Controller options - description" (page
354) explains the options in more detail.
Table 161
Clock Controller options - summary
CC Option CPU Type
Notes
Option 1 Single Ref from P0 on Clk0
Ref from P1 on Clk0
Option 2 Dual Ref from P0 on Clk0
Ref from P0 on Clk1
Option 3 Dual Ref from P1 on Clk0
Ref from P1 on Clk1
Option 4 Dual Ref from P0 on Clk0
Ref from P0 on Clk1
Ref from P1 on Clk0
Ref from P1 on Clk1
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
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