T640 Sonet Clock Generators (Scgs) Description; Figure 12: Scg With Db-9 Ports; Table 9: Supported Power Supplies - Juniper T640 Hardware Manual

Hide thumbs Also See for T640:

Table of Contents

T640 SONET Clock Generators (SCGs) Description

Replacing a T640 Craft Interface on page 265

The SONET Clock Generators (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. SCGs are

installed into the upper rear of the chassis in the slots labeled

Backup SCGs are hot-removable and hot-insertable. Master and nonredundant SCGs

are hot-pluggable.

The router supports the SCGs in

Redundant SCGs must be the same model number, except during

SCG with DB-9 ports

(Figure 12 on page

SCG with RJ-48 ports

(Figure 13 on page

Chapter 3: Chassis Components and Descriptions

Table 9 on page

Model Number

First Supported Junos OS

Table of Contents