Q-Logic 8C User Manual

2 – General Description

Fibre Channel Ports

59042-01 A

2-5

SFP transceivers plug into the ports; duplex fiber optic cables plug into the 
transceivers which then connect to the devices. A port is capable of transmitting at 
1 Gbps or 2 Gbps; however, the transceiver must be capable of 2 Gbps for the 
port to deliver at that rate.

The SFP transceivers are hot swappable. This means that you can remove or 
install an SFP transceiver while the switch is operating without harming the switch 
or the transceiver. However, communication with the connected device will be 
interrupted. Refer to 

 for information about 

installing and removing SFP transceivers.

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 loop initialization or port log-in, 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. An 
Logged-In LED will also illuminate when the port has been designated as a donor 
port and its buffer credits are being used by another port. Refer to 

 for more information about extended credits and donor ports.

If the port connection is broken or an error occurs that disables the port, the 
Logged-In LED will flash. Refer to 

 for 

more information about the Logged-In LED.

The Activity LED indicates that data is passing through the port. Each frame that 
enters or leaves the port causes this LED to illuminate for 50 milliseconds. This 
makes it possible to observe the transmission of a single frame. When extending 
credits, an Activity LED for a donor port will reflect the traffic of the recipient port. 
Refer to 

 for more information about extended credits and 

donor ports.