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Cisco 5520 and 8540 Wireless Controller Troubleshooting Guide
 
  Troubleshooting
Not able to detect the 1G SFP
Port and Link LEDS
On Boot up vKVM /Monitor does not display any output 
Solution
Display Port / VGA Terminal is not supported.
• Connect the RJ45 console at the rear or use console of break out connector.
Console output not visible / Console port not working
Solution 
• Check if the correct console port is connected and not VGA/Video port
• Check if baudrate is 9600