T4000 Sonet Clock Generators (Scgs) Description; Scg Slots; Scg Function; Scg Redundancy - Juniper T4000 Hardware Manual

T4000 Core Router Hardware Guide
Related
Documentation

T4000 SONET Clock Generators (SCGs) Description

SCG Slots

SCG Function

SCG Redundancy

Supported SCGs

20
T4000 Router Description on page 3
T4000 Chassis Description on page 11
T4000 Component Redundancy on page 7
SCG Slots on page 20
SCG Function on page 20
SCG Redundancy on page 20
Supported SCGs on page 20
SCG Components on page 21
The SCGs are installed into the upper rear of the chassis in the slots labeled
SCG1 .
SCGs provide 19.44-MHz Stratum 3 clock signal for the SONET/SDH interfaces on the
router.
One SCG is shipped as part of the standard router configuration, but up to two SCGs can
be installed to provide redundancy. A nonredundant SCG is hot-pluggable. For redundant
SCGs, the master SCG is hot-pluggable. If the master SCG is functioning, the backup
SCG is hot-removable and hot-insertable. Removing the backup SCG does not affect
the functioning of the router. Taking the master SCG offline might result in a brief loss of
SONET clock lock while the backup SCG becomes the master.
The T4000 router supports the SCG in
NOTE: Redundant SCGs must be the same model number, except during
upgrade.

Table 4: Supported SCG

Name
SCG with RJ-48 ports
SCG with DB-9 ports
Table 4 on page 20.
Model Number
SCG-T-EC
SCG-T
Copyright © 2018, Juniper Networks, Inc.
and
SCG0
First Supported Junos OS
Release
12.1
12.1