Service manual

4
Performing Loopback Tests
4-23
Repair Information
8. When finished, click Cancel to close the Port Diagnostics dialog
box.
9. Reset the port:
a. At the Hardware View, right-click the port graphic. A pop-up
menu appears.
b. Select Reset Port. A message box displays, indicating a link
reset will occur.
c. Click OK.Theportresets.
10. Notify the customer that the test is complete and the attached
device can be set online.
External Loopback Test (Element Manager Application)
To perform an external loopback at the Element Manager application:
1. Notify the customer that a disruptive external loopback test will
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, select Port Diagnostics from
the Maintenance menu. The Port Diagnostics dialog box displays
(Figure 4-5).
5. TypetheportnumbertobetestedorselectallportsatthePort
Select area of the dialog box.
6. At the Diagnostics Test list box, select the External Loop option.
7. Click Next.AtthePort 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.Themessage
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.