Manual

x510 Series Installation Guide for Stand-alone Switches

 Test the attenuation of both directions on the fiber optic cable with

a fiber optic tester to determine whether the optical signal is too

weak (sensitivity) or too strong (maximum input power).

Problem 5: Network performance between a twisted pair port on the

switch and a network device is slow.

Solution: There might be a duplex mode mismatch between the port and

the network device. This can occur when a twisted pair port using Auto-

Negotiation is connected to a remote device that has a fixed speed of 10

or 100 Mbps and a fixed duplex mode of full duplex. If this is the cause of

the problem, adjust the duplex mode of the port on the network device or

switch so that both ports are using the same duplex mode. You can use

either the LEDs or management software on the switch to determine the

duplex mode settings of the ports. The LEDs are described in Table 6 on

page 34.

Problem 6: The switch functions intermittently.

Solutions: Check the system hardware status through the management

software:

 Use the SHOW SYSTEM ENVIRONMENT command in the

Privileged Exec mode to verify that the input voltage from the

power source to the switch is stable and within the approved

operating range. The unit will shutdown if the input voltage

fluctuates above or below the approved operating range.

 Use the SHOW SYSTEM ENVIRONMENT command in the

Privileged Exec mode to verify that the fan is operating correctly.

 Verify that the location of the switch allows for adequate airflow.

The unit will shutdown if it is in danger of overheating.

Problem 7: The Switch ID LED on the front of the switch is flashing the

letter “F.”

Solutions: One or more of the following problems has occurred:

 A cooling fan has failed.

 One of the power supplies has failed.

 The input voltage on one or both of the power supplies is outside

the normal operating range.

 The internal temperature of the switch has exceeded the normal

operating range and the switch may shut down.

Contact your Allied Telesis sales representative for assistance.