Table 13 clock controller options - summary, For a description – Nortel Networks NN43001-301 User Manual

Page 52

ISDN 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)

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