Action On a regular basis:
• Check the SCG LEDs. During normal operations:
• The green OK LED on the SCG faceplate is lit.
• The yellow FAIL LED on the SCG faceplate is not lit.
• The blue MASTER LED on the SCG faceplate indicates which SCG is the master.
For more information, see “T640 SONET Clock Generators (SCGs) Description” on
page 27.
• Issue the show chassis environment scg command to display information about the
SCGs. The output is similar to the following:
user@host> show chassis environment scg
SCG 0 status:
State Online - Master clock
Temperature 31 degrees C / 87 degrees F
Power:
GROUND 0 mV
3.3 V 3310 mV
5.0 V 5052 mV
5.6 V 5689 mV
1.8 V bias 1782 mV
3.3 V bias 3306 mV
5.0 V bias 4989 mV
8.0 V bias 8336 mV
GBUS Revision 40
FPGA Revision 1.6
For further description of the output from the commands, see show chassis environment
scg.
Related
Documentation
T640 Chassis Description on page 15•
• T640 Host Subsystem Description on page 35
• Replacing a T640 SCG on page 277
Maintaining the T640 Air Filters
Purpose For optimum cooling, verify the condition of the filters.
Action 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 “Replacing a T640 Air Filter” on page 281.
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
Copyright © 2017, Juniper Networks, Inc.444
T640 Core Router Hardware Guide
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