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edge switch 2/24 service manual
Repair Information
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. At the HAFM server, open the HAFM application. The Product View displays.
3. Select the icon representing the switch to be tested. The Hardware View for the
selected switch displays.
4. At the Hardware View, verify the location of the port to be tested. When the
mouse pointer is passed over the graphical port on the front view of the switch, the
port highlights with a blue border and an pop-up displays Switch Port.
5. At the navigation control panel, select Port Diagnostics from the Maintenance
menu. The Port Diagnostics dialog box displays (
Figure 3–10
).
6. Type the port number to be tested or select all ports at the Port Select area of the
dialog box
7. At the Diagnostics Test list box, select Internal Loopback.
