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General Description
1-5
Fibre Channel Ports
Figure 1-6. External 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
module extinguishes all Logged-In LEDs. Following a successful loop
initialization or port login, the switch module 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 will flash. Refer to “Logged-In LED Indications” on page 4-2 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 causes this LED to illuminate for 50
milliseconds. This makes it possible to observe the transmission of a single
frame. When extending credits, the Activity LED for a donor port will reflect
the traffic of the recipient port. Refer to “Distance” on page 2-4 for more
information about extended credits and donor ports.
Transceivers
Switch modules support SFP optical transceivers for the Fibre Channel ports.
A transceiver converts electrical signals to and from optical laser signals to
transmit and receive data. Duplex fiber optic cables plug into the transceivers
which then connect to the devices. A Fibre Channel port is capable of
transmitting at 1-Gbps or 2-Gbps; however, the transceiver must also be
capable of delivering at these rates.
The SFP transceivers are hot pluggable. This means that you can remove or
install a transceiver while the switch module is operating without harming
the switch module or the transceiver. However, communication with the
connected device will be interrupted. Refer to “Install SFP Transceivers” on
page 3-3 for information about installing and removing SFP optical
transceivers.
Logged-In
LED (Green)
Activity LED
(Green)
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