L2 Managed Switch
AAAAAAAAAAAATroubleshooting
QQQQWhat could I do if I forgot the username and password of the Switch?
111 Connect the console port of the PC to the console port of the Switch and open hyper terminal.
222Power off and restart the Switch. When you are prompted that “Press
333Enter the reset command to reset the system. Th system will be reset to the factory default settings, and the default login user name and password are both admin.
QQQQWhy does the Power LED work abnormally?
The Power LED should be lit up when the power system works normally. If the Power LED worked abnormally, please take the following steps:
111Make sure that the power cable is connected properly, and the power contact is normal.
222Make sure the voltage of the power supply meets the requirement of the input voltage of the Switch.
QQQQWhat could I do if I could not access the
You are recommended to check the following items:
111Check every port LED on the Switc and make sure the cable is installed properly.
222Try another port on the Switch and make sure the cable meets the requirement and works normally.
333Turn off the power. After a while, turn on the power again.
444Make sure the IP address of your PC is set within the subnet of the Switch.
555If you still cannot access the configuration page, please restore the Switch to its factory defaults. Then the IP address should be set as 192.168.0.x ("x" is any number from 2 to
254)and Subnet Mask as 255.255.255.0.
QQQQWhy does the hyper terminal display abnormally?
Please check as follows:
111Make sure the power supply is normal and the console cable is properly connected.
222Check if the console cable is the right type.
333Ensure the parameters of the hyper terminal are correct: configure Bits per second as
38400, Data bits as 8, Parity as None, Stop bits as 1, and Flow control as None.
Troubleshooting 
22
