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89HP StorageWorks 2/8q Fibre Channel Switch Management User Guide
4. Verify Requested Changes—Review the extended distance requests and the selected
donor ports. Click Finish to apply the changes, and redistribute the credits.
Note: As credits are used, the Logged-In LEDs on the corresponding donor ports illuminate
continuously. In addition, donor port Activity LEDs reflect the same traffic as the recipient port.
Donor ports whose credits are being used are unavailable to devices that are connected to them.
Resetting a port
The Reset Port option reinitializes the port using the saved configuration.
1. In the faceplate display, select the port(s) to be reset.
2. Select Port > Reset Port.
Testing ports
The port loopback tests verify correct port operation by sending a frame out through the loop,
and then verifying that the frame received matches the frame that was sent. Only one port can
be tested at a time for each type of test. The Port Loopback Test dialog box presents the
following loopback tests:
■ SerDes level (Internal)—The SerDes level test verifies port circuitry. The SerDes level
test sends a test frame from the ASIC through the SerDes chip and back to the ASIC for
the selected ports. The port passes the test if the frame that was sent by the ASIC matches
the test frame that was received. This test requires that the port be in diagnostics mode,
and therefore, disrupts communication.
■ SFP level (External)—The SFP level test verifies port circuitry. The SFP level test sends
a test frame from the ASIC through the SerDes chip, through the SFP transceiver fitted
with an external loopback plug, and back to the ASIC for the selected ports. The port
passes the test if the test frame that was sent by the ASIC matches the test frame that was
received. This test requires that the port be in diagnostics mode, and therefore, disrupts
communication.
■ Node-to-Node (Online)—The Node-to-Node test verifies communications between the
port and its device node or device loop. The port being tested must be online and
connected to a remote device. The port passes the test if the frame that was sent by the
ASIC matches the frame that was received. This test does not disrupt communication on
the selected port. This test requires that the port be online, and therefore, does not disrupt
communication.
To run the internal, external, or online port loopback test on a port:
1. In the faceplate display, select the port to be tested, and then select Port > Port Loopback
Test. The Port Loopback Test dialog box is displayed (Figure 33).