Rear Panel Components
The rear panel of the router has slots for the power supply modules and fan modules. The power and fan
modules are installed from the rear of the router. “MX204 Chassis Description” on page 23 and “MX204
Chassis Description” on page 23 shows the rear of the fully configured chassis.
Table 6 on page 28 lists the components on the rear panel of the MX204 router.
Table 6: Rear Panel Components in a Fully Configured MX204 Router
Number of FRUsSlotsComponent
20 and 1Power supply module
30 through 2Fan module
Alarm LEDs on the MX204 Front Panel
One alarm LED—labeled ALM—is located on the front panel of the router. A red light indicates a critical
condition that can result in a system shutdown, and a yellow light indicates a less severe condition that
requires monitoring or maintenance.
Table 7 on page 28 describes the alarm LED in more detail.
Table 7: Alarm LED on the MX204 Front Panel
DescriptionColorShape
Critical alarm—Indicates a critical condition that
can cause the router to stop functioning. Possible
causes include component removal, failure, or
overheating.
Red
Warning alarm—Indicates a serious but nonfatal
error condition, such as a maintenance alert or
a significant increase in component temperature.
Yellow
SEE ALSO
Routine Maintenance Procedures for MX204 Routers | 115
28
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