24 Service Manual (AA-RTDXC-TE, July 2004)

Repair Information

159Edge Switch 2/24 Service Manual

Perform Loopback Tests

This section describes procedures to perform an:

■ Internal loopback test–An internal loopback test checks internal port,

serializer, and deserializer circuitry and checks for the presence of an optical

transceiver, but does not check fiber-optic components of the installed

transceiver. Operation of the attached device is disrupted during the test.

■ External loopback test–An external loopback test checks all port circuitry,

including fiber-optic components of the installed optical transceiver. To

perform the test, the attached device must be quiesced and disconnected from

the port, and a singlemode or multimode loopback plug must be inserted in

the port.

Internal Loopback Test

To perform an internal loopback test for a single port:

1. Notify the customer that a disruptive internal loopback test is to be performed

on a port. Ensure the customer’s system administrator quiesces Fibre Channel

frame traffic through the port and sets the attached devices offline.

Note: An SFP transceiver must be installed in the port during the test. A switch can

remain attached during the test.

2. Open the HAFM application. The View All - HAFM 8 main window displays.

3. At the HAFM physical map, right-click the product icon representing the

switch to be tested, then click Element Manager from the pop-up menu. The

application opens.

4. Click Maintenance > Port Diagnostics. The Port Diagnostics dialog box

displays.

5. Type the port number to be tested, or select all ports at the Port Select area of

the dialog box