JUNOS Internet Software Network Operations Guide: Hardware
Monitor the Control Board Tasks
Verifying Control Board Failure on page 310
1. Check the Control Board Connection on page 310
2. Check the Control Board Fuses on page 311
3. Perform a Control Board Swap Test on page 312
4. Display the Control Board Hardware Information on page 313
5. Locate the Control Board Serial Number ID Label on page 314
Returning the Control Board on page 314
Command or Action
1. Make sure that the Control Board is properly seated in the midplane.
2. Ensure that none of the pins are bent.
3. Check the thumbscrews on the ejector locking tabs.
The fuses for the Control Boards are located in the rear of the midplane behind the power supply in slot PEM0 .
1. Take the host subsystem offline if the Control Board is master.
2. Replace the Control Board with one that you know works.
3. Bring the Control Board online.
4. Check the Control Board status.
show chassis hardware
Look on the bottom of the left side of the Control Board.
Follow the procedure in the appropriate hardware guide.
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Chapter 22: Monitoring the Control Board
Understanding the Control Board
Purpose Inspect the Control Boards to ensure that control and monitoring functions occur for the router.
What Is the Control
Board
The Control Board works with an adjacent Routing Engine in the host subsystem on
M320 and T320 routers and the T640 routing node to provide control and monitoring functions. These functions include determining Routing Engine mastership, controlling power, performing reset and SONET clocking for the other router components, monitoring and controlling fan speed, and monitoring system status using I
2
C controllers.
M320 Router Control Board
Figure 124 shows the Control Board component used on the M320 router.
Figure 124: M320 Router Control Board Component
Extractor clip
CB-M
MAS
FAIL
OK
TER
Online/offline button
LEDs
External clock connections
EXTE
A
RNA
L C
LOC
K IN
PUTS
B
Extractor clip
Understanding the Control Board !
303
