H3C S5560-EI Series Troubleshooting Manual page 31

2. Verify that the speed and duplex mode of the local port match the speed and duplex mode of the
transceiver module:
a. Execute the display interface brief command to examine whether the speed and duplex mode
of the port match the speed and duplex mode of the transceiver module.
b. If they do not match, use the speed command and the duplex command to set the rate and
duplex mode for the port.
3. Verify that the ports at both ends are operating correctly:
a. For a GE SFP port, use an SFP transceiver module and a fiber to connect it to another SFP port
on the local end. For a 10-GE SFP+ fiber port, use an SFP+ cable (used for short-haul
connection) to directly connect it to another 10-GE SFP+ fiber port on the local end. For a
40-GE QSFP+ port, use a QSFP+ cable (used for short-haul connection) to directly connect it to
another 40-GE QSFP+ port on the local end.
b. Identify whether the port comes up:
If the port comes up, the peer port fails. Replace the peer port with a new port operating
−
correctly.
If the port remains in down state, the local port fails. Replace the local port with a new port
−
operating correctly.
4. Verify that the transceiver module and cable are operating correctly:
a. Use the display transceiver alarm interface command to display the alarms present on the
transceiver module:
The device displays None if no error occurs.
−
The device displays alarms if the transceiver module fails or the type of the transceiver
−
module does not match the port type.
b. Use an optical power meter to verify that the Tx power and Rx power of the transceiver module
are stable and are within the correct range.
c. Execute the display transceiver interface command to verify that the wavelength and
transmission distance of the local transceiver module are consistent with the wavelength and
transmission distance of the peer transceiver module.
d. If the transceiver module is not operating correctly, replace it with a H3C transceiver module
that matches the fiber port.
For more information about transceiver modules and cables, see the installation guide.
NOTE:
When you use a QSFP+ to SFP+ cable to connect a 40-GE QSFP+ fiber port, you must use an optical
attenuator because the Tx optical power of the QSFP+ transceiver module exceeds the upper Rx
optical power limit of the SFP+ transceiver module.
5. Verify that the fiber matches the transceiver module. If they do not match, replace the fiber with a
new one that matches the transceiver module.
For more information about fibers, see the installation guide.
6. If the problem persists, contact H3C Support, and provide the following information:
<Sysname> display diagnostic-information
Save or display diagnostic information (Y=save, N=display)? [Y/N]:Y
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