Maintaining The T640 Air Filters - Juniper T640 Hardware Manual

T640 Core Router Hardware Guide
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Maintaining the T640 Air Filters

Purpose
Action
444
On a regular basis:
Check the SCG LEDs. During normal operations:
The green LED on the SCG faceplate is lit.
OK
The yellow LED on the SCG faceplate is not lit.
FAIL
The blue LED on the SCG faceplate indicates which SCG is the master.
MASTER
For more information, see
page 27.
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 show chassis environment
scg.
T640 Chassis Description on page 15
T640 Host Subsystem Description on page 35
Replacing a T640 SCG on page 277
For optimum cooling, verify the condition of the filters.
On a regular basis:
Check the air filters regularly for dust and debris. The filter elements degrade over time,
so the filter elements in use, as well as spares, should be replaced every 6 months. For
procedures to replace the air filters, see
The shelf life of polyurethane filter varies from two years to five years depending on the
storage conditions. Store in a cool, dry, and dark environment. Wrap the media in plastic
and store in an environment with relative humidity between 40%- 80% and temperature
"T640 SONET Clock Generators (SCGs) Description" on
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
"Replacing a T640 Air Filter" on page 281.
Copyright © 2017, Juniper Networks, Inc.