Nortel Networks NN43001-301 manual Clock configurations

52ISDN Primary Rate Interface equipment overview

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 NT5D12 card is capable of supplying two references from each clock source, i.e., four references in total. NT5D12 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 19 "Clock Controller - Option 1" (page

54)through Figure 22 "Clock Controller - Option 4" (page 57) on pages Figure 18 "Clock Controller primary and secondary tracking" (page 50) to Figure 22 "Clock Controller - Option 4" (page 57).

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 45) for more information.

Table 13 "Clock Controller options - summary" (page 52) summarizes the clocking options. Table 14 "Clock Controller options - description" (page

53)explains the options in more detail.

Table 13

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

ISDN Primary Rate Interface Installation and Commissioning

NN43001-301 02.03 Standard

Release 5.5 7 December 2007

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