• T640 RE-C1800 LEDs on page 43
• Troubleshooting the T640 Host Subsystem on page 472
Maintaining the T640 Control Boards
Purpose For optimum router performance, verify the condition of the router’s control boards.
Action On a regular basis:
• Check the LEDs on the control board faceplate. During normal operations:
• The green OK LED on the control board faceplate is lit.
• The green host subsystem OK LED on the craft interface is lit.
• The red host subsystem FAIL LED on the craft interface is not lit.
• The yellow FAIL LED on the control board faceplate is not lit.
• Issue the show chassis environment cb command to check the status of the control
boards. The output is similar to the following:
user@host> show chassis environment cb
CB 0 status:
State Online Master
Temperature 29 degrees C / 84 degrees F
Power:
1.8 V 1809 mV
2.5 V 2496 mV
3.3 V 3295 mV
4.6 V 4687 mV
5.0 V 5042 mV
12.0 V 11985 mV
3.3 V bias 3277 mV
8.0 V bias 7472 mV
GBUS Revision 40
FPGA Revision 7
For further description of the output from the commands, seeshow chassis environment
cb.
Related
Documentation
T640 Control Boards Description•
• T640 Standard Control Boards LEDs on page 64
• T640 T Series Control Boards (T-CBs) LEDs on page 66
• T640 LCC-CB LEDs on page 62
• Troubleshooting the T640 Host Subsystem on page 472
• Troubleshooting the T640 Control Board on page 473
449Copyright © 2017, Juniper Networks, Inc.
Chapter 32: Maintaining Components
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