Figure 249: M40E M160 Router Fuses; Verifying Mcs Failure - Juniper M Series Monitoring And Troubleshooting Manual

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M Series and T Series Routers Monitoring and Troubleshooting Guide

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Check the MCS Fuses

Table 118: MCS LEDs (continued)

When the MCS is functioning normally, the green

LED is on, check for MCS alarms.

Checklist for Monitoring the MCS on page 455

To verify MCS operation failure:

Check the MCS Fuses on page 460

Perform an MCS Swap Test on page 461

To check for blown MCS fuses.

The M40e and M160 router fuses are located in a fuse box at the rear of the midplane,

behind the lower rear impeller assembly. You must remove the lower impeller assembly

to access the fuses, as described in the appropriate router hardware guide.

When the fuse for an MCS blows, the MCS stops functioning even though it is installed

correctly and the power supplies are providing power to the router.

For the M40e and M160 routers, when a fuse has blown but the power supplies are still

delivering power to router, the amber LED adjacent to the fuse lights. See

Figure 249: M40e M160 Router Fuses

Another indication that a fuse has blown is that the colored indicator bulb inside it

becomes visible through the clear cover on the fuse. For information about the indicator

bulb color for each fuse type, see the appropriate router hardware guide.

MCS is operating normally.

MCS is starting up.

MCS has failed.

LED remains on steadily. If the amber

Figure 249 on