Troubleshooting; Resolving A No Link Condition; Problems/Solutions - Black Box 12-Port 1000BASE-TX L2 Managed PoE Switch User Manual

12-Port 1000BASE-TX L2 Managed PoE Switch with 2 SFP Dual Media Ports

6.1 Resolving a 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.

6.2 Problems/Solutions

Problem: Computer A can connect to Computer B but cannot connect to Computer C through the switch.
Solution #1: The network device connected to Computer C may fail to work. Check Computer C's Link/Act
LED status. Try another network device on this connection.
Solution #2: Computer C's network configuration may be incorrect. Verify the computer's network
configuration.
Problem: The uplink connection function fails to work.
Solution #1: The connection ports on another switch must be connection ports. Make sure connection ports
are used on that switch.
Solution #2: Verify that the uplink function is enabled.
Problem: The console interface doesn't appear on the console port connection.
Solution#1: The COM port default parameters are: baud rate: 57600; Data bits: 8; Parity bits: None; Stop bit: 1;
Flow control: None. Check the COM port values in the terminal program. If the parameters are changed, set
the COM configuration to the default settings.
Solution #2: Make sure that the RS-232 cable is securely connected to the switch's console port and the PC's
COM port.
Solution #3: Make sure the PC's COM port is enabled.
Problem: How do I configure the switch?
Solution: "Hyperterm" is the terminal program in Windows 95, 98, or Windows NT
other terminal programs in Linux
The COM port parameters (baud rate, data bits, parity bits, flow control) must be the same as the switch's
console port setting.
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6. Troubleshooting

® ®
or UNIX to configure the switch. Refer to terminal program's user guide.
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. You can also use any