FW 08.01.00 McDATA Sphereon 4500 Fabric Switch Installation and Service Manual (620-000159-330, November 2005)

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McDATA Sphereon 4500 Fabric Switch Installation and Service Manual
Repair Information
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. To perform the test:
1. Inform the customer a disruptive external loopback test is to be
performed and the attached device must be disconnected.
2. Disconnect the fiber-optic jumper cable from the port to be tested.
3. Depending on the port technology, insert a singlemode or
multimode loopback plug into the port receptacle.
4. At the Element Manager application (management server), select
Port Diagnostics from the Maintenance menu. The Port Diagnostics
dialog box displays (Figure 4-14).
5. Type the port number to be tested or select all ports at the Port
Select area of the dialog box.
6. At the Diagnostics Test list box, select the External Loop option.
7. Click Next. At the Port Diagnostics dialog box, the message
Loopback plug(s) must be installed on ports being diagnosed
appears.
8. Verify a loopback plug is installed and click Next. The message
Press START TEST to begin diagnostics appears, and the Next
button changes to a Start Test button.
9. Click Start Test. The test begins and:
a. The Start Test button changes to a Stop Test button.
b. The message Port xx: TEST RUNNING appears.
c. A red progress bar (indicating percent completion) travels
from left to right across the Completion Status field.
10. When the test completes, results appear as Port xx: Passed! or
Port xx: Failed! in the message area of the dialog box.
11. When finished, click Cancel to close the Port Diagnostics dialog
box.
12. Remove the loopback plug and reconnect the fiber-optic jumper
cable from the device to the port (disconnected in step 2).