Front Panel LEDs
Over Temperature LED (Red)
This LED is normally OFF. The over temperature LED illuminates to indicate that the air temperature inside the switch has exceeded a certain limit. If this LED illuminates, inspect the following:
•Ambient air temperature: maximum 40°C (104°F)
•Proper clearance: 163mm (6.5”) front, left side, and back
•Fan operation
•Power supply operation
If the over temperature LED remains illuminated, contact your authorized mainte- nance provider (refer to Appendix B ).
Logged-In LED (Green)
Each port has its own Logged-In LED. The Logged-In LED indicates the logged-in or initialization status of the connected device or loop of devices. A T_Port Logged-In LED will blink to indicate that the switch has been disabled due to a chassis number conflict.
Normal Operation
Initially (immediately after the Switch successfully completes the POST), the Switch holds all Logged-In LEDs OFF (no light). They each remain OFF until the port and its attached devices are able to successfully perform a loop initialization (LIP) or port log-in. Following a successful LIP or log-in on a particular port, the Switch turns the Logged-In LED ON (lit) for that port. This shows that the port is properly connected and able to communicate with its attached device/s. The LED for this port remains ON as long as the port is initialized or logged-in.
If the established/logged-in link is broken (a fiber opens or the connected port goes out of service), the Logged-In LED is shut OFF. If the link is replaced or the connected port comes back into service, the port and its attached device/s will try to regain its initialized or logged-in status. If the initialization/log-in is once again established, the Switch turns the Logged-In LED back ON and communication continues.
It is best to have the Switch operating before the attached nodes are powered up.
Duplicate Chassis Number Warning
Upon T_Port Login, if the fabric senses two switches of the same stage type (cross- connect or IO/T) with the same chassis number, the switch with the higher world wide name will be disabled. In addition, the affected port Logged-In LEDs on both switches will blink to indicate that a conflict exists. Refer to “Multistage Topology” on page 5-12for more information about stage types.
