Ptx5000 Centralized Clock Generator Description - Juniper PTX5000 Hardware Manual

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PTX5000 Centralized Clock Generator Description

IN THIS SECTION

CCG Slots | 29

CCG Function | 29

CCG Components | 29

The Centralized Clock Generators (CCGs) are installed into the upper rear of the chassis in the slots

labeled CCG0 and CCG1. One CCG is shipped as part of the standard PTX5000 configuration, but up to

two CCGs can be installed to provide redundancy.

A nonredundant CCG is hot-pluggable. For redundant CCGs, the primary CCG is hot-pluggable. The

backup CCG is hot-removable and hot-insertable if the primary CCG is functioning. Removing the

backup CCG does not affect the functioning of the PTX5000. Taking the primary CCG offline might

result in a brief loss of the clock lock while the backup CCG becomes the primary.

CCG Function

CCGs provide a 19.44-MHz Stratum 3E clock signal for the Ethernet network interfaces on the

CCG Components

Each CCG (see

Figure 10 on page

• 19.44-MHz Stratum 3E clock.

30) consists of the following components:

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