Ptx5000 Centralized Clock Generator Description; Ccg Slots; Ccg Function; Ccg Components - Juniper PTX Series Hardware Manual

PTX5000 Packet Transport Switch Hardware Guide

PTX5000 Centralized Clock Generator Description

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Documentation
16
CCG Slots on page 16
CCG Function on page 16
CCG Components on page 16

CCG Slots

The Centralized Cock Generators (CCGs) are installed into the upper rear of the chassis
in the slots labeled CCG0 and
transport switch configuration, but up to two CCGs can be installed to provide redundancy.
A nonredundant CCG is hot-pluggable. For redundant CCGs, the master CCG is
hot-pluggable. The backup CCG is hot-removable and hot-insertable if the master CCG
is functioning. Removing the backup CCG does not affect the functioning of the packet
transport switch. Taking the master CCG offline might result in a brief loss of the clock
lock while the backup CCG becomes the master.

CCG Function

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

CCG Components

Each CCG (see Figure 5 on page
19.44-MHz Stratum 3E clock.
Field-programmable gate array (FPGA) that performs multiplexing of clock sources.

Figure 5: CCG

1 2
3
1— OK FAIL
Three LEDs— , , and
display the status of the CCG.
2— ONLINE/OFFLINE
button
PTX5000 Centralized Clock Generator LEDs on page 17
CCG1 . One CCG is shipped as part of the standard packet
16) consists of the following components:
4
MASTER 3—
—that Two RJ-48 connectors labeled
BITS B
1.5444 MHz or 2.048 MHz. Two LEDs for
each BITS connector—
LINK
—that display the status of the BITS
ports.
4—
Four GPS connectors labeled
CLOCK
GPS1 SYNC
5 MHz or 10 MHz. The LEDs for the GPS ports
are not supported.
BITS A
for BITS external clock inputs,
FAULT
and
GPS0
, GPS0 SYNC , GPS1 CLOCK
, for GPS external clock inputs,
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