Maintaining The T640 Scgs - Juniper T640 Hardware Manual

T640 Core Router Hardware Guide
Related
Documentation

Maintaining the T640 SCGs

Purpose
Action
Related
Documentation
150
FPGA Revision
For further description of the output from the commands, see the Junos OS System Basics
and Services Command Reference.
T640 T Series Control Boards (T-CBs) Description on page 38
T640 T Series Control Boards (T-CBs) LEDs on page 39
Replacing a T640 T-CB on page 201
For optimum router performance, verify the condition of the SCGs.
On a regular basis:
Check the SCG LEDs. For more information, see "T640 Standard SONET Clock
Generators (SCGs) Description" on page 40.
Issue the show chassis environment scg
SCGs. The output is similar to the following:
user@host> show chassis environment scg
SCG 0 status:
State
Temperature
Power:
GROUND
3.3 V
5.0 V
5.6 V
1.8 V bias
3.3 V bias
5.0 V bias
8.0 V bias
GBUS Revision
FPGA Revision
For further description of the output from the commands, see the Junos OS System
Basics and Services Command Reference.
T640 Chassis Description on page 13
T640 Host Subsystem Description on page 32
Replacing a T640 SCG on page 210
7
command to display information about the
Online - Master clock
31 degrees C / 87 degrees F
0 mV
3310 mV
5052 mV
5689 mV
1782 mV
3306 mV
4989 mV
8336 mV
40
1.6
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