QTECH QSW-3400 Инструкция по настройке - Manual (Page 120)

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14.4 DDM Troubleshooting
If problems occur when configuring DDM, please check whether the problem is caused by the
following reasons:

Ensure that the transceiver of the fiber module has been inserted fast on the port, or
else DDM configuration will not be shown.

Ensure that SNMP configuration is valid, or else the warning event cannot inform the
network management system.

Because only some boards and box switches support SFP with DDM or XFP with
DDM, ensure the used board and switch support the corresponding function.

When using show transceiver command or show transceiver detail command, it cost
much time due to the switch will check all ports, so it is recommended to query the
monitoring information of the transceiver on the specified port.

Ensure the threshold defined by the user is valid. When any threshold is error, the
transceiver will give an alarm according to the default setting automatically.