QTech QSW-4700 Series User Manual

QSW-4700 Series Switches Hardware Installation and Reference Guide
Troubleshooting
69
6.2.2. Fault 2: The AC power module does not work.
Symptom
All LEDs on the front panel are off. The fan status LED is off.
The power supply status LED is off. The fan does not rotate.
Suggested Action
1. Unplug the power cord from the power supply module.
2. Check whether the power cord is securely connected to the power socket.
3. Check whether the power cord is securely connected to the power supply module.
4. Check whether the power supply module is securely seated. If necessary, pull out the
power supply module and check its connector.
6.2.3. Fault 3: The serial port console has no output.
Symptom
After the system is started, the serial port console does not display any information.
Suggested Action
1. Check the serial cable.
2. Ensure that the connected serial port is consistent with what is configured on the
HyperTerminal.
3. Check whether the configuration of the serial port on the HyperTerminal is consistent
with that in Configuration Guide.
4. If there is still no output on the serial port, please contact QTECH technical support.
6.2.4. Fault 4: The serial port console output is garbled.
Symptom
The serial port console output is garbled.
Suggested Action
The fault is related to the serial port configuration. Check the baud rate configuration is consistent
with that in Configuration Guide.
6.2.5. Fault 5: The link cannot be set up on the fiber port.
Symptom
After the SFP module is inserted into the fiber port with the fiber-optic cable plugged in, the link
cannot be set up on the fiber port.
Suggested Action
Take the following steps:
1. Check whether the receiving end and transmitting end are reversed. The transmitting
end of a fiber port must be connected to the corresponding receiver at the other end.
You can confirm both ends by exchanging the connection order of two fiber-optic
cables.
2. Check whether the wavelength of the SFP modules on the two sides are consistent.
For example, an SFP module with a wavelength of 1310 nm cannot be connected to
an SFP module of 1550 nm.
3. Check whether the distance between the two sides exceeds the maximum length
marked on the SFP module.

QTech QSW-4700 Series Specifications

General

Brand	QTech
Model	QSW-4700 Series
Category	Switch
Language	English