2 – General Description
Fibre Channel Ports
59265-00  A 2-5
A
Port LEDs
Each port has its own Logged-In LED (L) and Activity LED (A) as shown in 
Figure 2-4.
Figure 2-4  Port LEDs
Port Logged-In LED (Green)
The Logged-in LED indicates the logged-in or initialization status of the connected 
devices. After successful completion of the POST, the switch extinguishes all 
Logged-In LEDs. Following a successful port login, the switch illuminates the 
corresponding logged-in LED. This shows that the port is properly connected and 
able to communicate with its attached devices. The Logged-In LED remains 
illuminated as long as the port is initialized or logged in. If the port connection is 
broken or an error occurs that disables the port, the Logged-In LED is 
extinguished. Refer to “Logged-In LED Indications” on page 5-7 for more 
information about the Logged-In LED.
Port Activity LED (Green)
The Activity LED indicates that data is passing through the port. Each frame that 
the port transmits or receives illuminates this LED for 50 milliseconds. This makes 
it possible to observe the transmission of a single frame.
       
Logged-In LED  Activity LED 
Logged-In LED 
Activity LED