To Next Page

To Previous Page

Table 60: SONET/SDH Interface Alarm Messages (continued)

CLI Message

interface-name so-x/x/x - SONET path mismatch

interface-name so-x/x/x - SONET path remote defect indicator

interface-name so-x/x/x - SONET PLL lock

interface-name so-x/x/x - SONET remote error indicator

interface-name so-x/x/x - SONET severely errored frame

interface-name so-x/x/x - SONET unequipped

Documentation

Displaying M7i Router Components and Serial Numbers on page 213•

• M7i Midplane Description on page 12

• M7i Router Description on page 3

Troubleshooting the M7i Fan Tray

Problem Description: The fans in the fan tray are not functioning normally.

Solution The router's single fan tray provides cooling for the router, including the CFEB or CFEB-E,

PICs, power supplies, and Routing Engine.

The cooling system draws in room air through the air intake vent on the left side of the

chassis. After entering the chassis, the air stream separates into separate flows for the

front and rear components. For a graphic depiction of the airflow, see Figure 9 on page 16.

For the cooling system to function properly, the clearance around the chassis must be

sufficient for unobstructed airflow. See “M7i Router Clearance Requirements for Airflow

and Hardware Maintenance” on page 77.

During normal operation, the fans in the fan tray function at less than full speed. The

router constantly monitors the temperatures detected by sensors on the router

components, adjusting the speed of the fans as necessary. If the router temperature

exceeds the acceptable maximum, the router turns off the power supplies.

The following conditions automatically cause the fans to run at full speed and trigger

the indicated alarm:

• A fan fails (red alarm).

• The router temperature exceeds the “temperature warm” threshold (yellow alarm).

• The temperature of the router exceeds the maximum (“temperature hot”) threshold

(red alarm and automatic shutdown of the power supplies).

M7i Multiservice Edge Router Hardware Guide

Juniper M7i Hardware Guide

Other manuals for Juniper M7i