System information

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Chapter 5
Maintenance
5-1. Resolving No Link Condition
The possible causes for a no link LED status are as follows:
 The attached device is not powered on

The cable may not be the correct type or is faulty
 The installed building premise cable is faulty

The port may be faulty
5-2. Q&A
1. Computer A can connect to Computer B, but cannot connect to Computer C through the
Managed Switch.
 The network device of Computer C may fail to work. Please check the link/act status
of Computer C on the LED indicator. Try another network device on this connection.
 The network configuration of Computer C may be something wrong. Please verify the
network configuration on Computer C.
2. The uplink connection function fails to work.
 The connection ports on another must be connection ports. Please check if
connection ports are used on that Managed Switch.

Please check the uplink setup of the Managed Switch to verify the uplink function is
enabled.
3. The console interface cannot appear on the console port connection.
 The COM port default parameters are [Baud Rate: 115200, Data Bits: 8, Parity Bits:
None, Stop Bit: A, Flow Control: None]. Please check the COM port property in the
terminal program. And if the parameters are changed, please set the COM
configuration to the new setting.
 Check the RS-232 cable is connected well on the console port of the Managed Switch
and COM port of PC.
 Check if the COM of the PC is enabled.
4. How to configure the Managed Switch?

The “Hyperterm” is the terminal program in Win95/98/NT. Users can also use any
other terminal programs in Linux/Unix to configure the Managed Switch. Please refer
to the user guide of that terminal program. But the COM port parameters (baud rate/
data bits/ parity bits/ flow control) must be the same as the setting of the console port
of the Managed Switch.