router. To review grounding and site wiring requirements for the router, see“DC Power
Electrical Safety Guidelines for the M120 Router” on page 347 and “Site Electrical Wiring
Guidelines for Juniper Networks Devices” on page 349.
Related
Documentation
M120 Power Supplies Description on page 71•
• Replacing an M120 AC Power Supply on page 239
• Replacing an M120 DC Power Supply on page 245
• Troubleshooting the M120 Power System on page 288
Maintaining the M120 FEBs
Purpose For optimum cooling, verify the condition of the FEBs.
Action On a regular basis:
• Check the LEDs on the FEB faceplate. For more information on the FEB LEDs, see Table
45 on page 77.
• Check the FEB LEDs on the craft interface to view information; see “FEB LEDs on the
M120 Craft Interface” on page 15.
• Issue the CLI show chassis feb command to check the status of each of the installed
FEBs. As shown in the sample output, the value Online in the column labeled State
indicates that the FEB is functioning normally.
user@host> show chassis feb
Temp CPU Utilization (%) Memory Utilization (%)
Slot State (C) Total Interrupt DRAM (MB) Heap
Buffer
0 Empty
1 Empty
2 Online 44 4 0 512 7
63
3 Online 46 4 0 512 7
63
4 Online 45 3 0 512 7
63
5 Online 42 4 0 512 7
63
For more detailed output, add the detail option. The following example also specifies
a slot number (0), which is optional:
user@host> show chassis feb detail 0
Slot 0 information:
State Online
Intake temperature 66 degrees C / 150 degrees F
Exhaust A temperature 67 degrees C / 152 degrees F
Exhaust B temperature 73 degrees C / 163 degrees F
Total DDR DRAM 512 MB
Total RLDRAM 64 MB
Copyright © 2018, Juniper Networks, Inc.278
M120 Multiservice Edge Router Hardware Guide
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