HP ProCurve 2424M Installation Manual page 15

2. Check the port LEDs for the newly-installed module to ensure that the
port(s) connected in the preceding step are operating correctly. For each
of the two transceiver ports on the switch module there are Link and Mode
LEDs as shown in the next illustration.
Example Link and Mode LEDs
• The Link LED will be lit for each port that is connected properly to an
active network device.
If the Link LED does not go on when an active network cable is
connected to the port, there may be something wrong with the cable,
the cable connectors, or the device at the other end of the cable. See
the troubleshooting information on page 13.
• If the switch Mode is set to display activity (the [Act] mode indicator LED
is lit), then the Mode LED for each port that is transmitting and/or
receiving packets will flicker when traffic is detected on the port.
• If the Mode is set to display full duplex (the [Fdx] mode indicator LED is
lit), then the Mode LED will be lit for each port that is operating in full
duplex.
• If the Mode is set to display 100 Mbps operation (the [100] mode indicator
LED is lit), then the Mode LED will be lit for each port that is operating
at 100 Mbps. Since the Gigabit Transceivers operate at
1 Gbps, the [100] Mode LED should not light for these ports.
For examples of connections using the Gigabit Stacking Module, see "Sample
Connections" on page 12.
Installing the Module
Link LED
9