3Com 3C16980 User Guide - Page 14

14 CHAPTER 1: INTRODUCING THE SWITCH 3300 Table 3 LED behavior LED Color Indicates Port Status LEDs* Packet Yellow Packets are being transmitted/received on the port. Off No packets are being transmitted/received on the port. Status Green A link is present, and the port is enabled. Green flashing A link is present, but the port is disabled. Off No link is present. Expansion Module Port Status LEDs Packet Yellow Packets are being transmitted/received on the Expansion Module port(s). Off No packets are being transmitted/received on the Expansion Module port(s). Status Yellow A valid Expansion Module is installed. Yellow flashing An unrecognized Expansion Module is installed. Off No Expansion Module is installed. Unit LEDs 1-8 Green The Switch forms a stack with other Switch units; the LED indicates the position of the Switch in the stack and that a link is present. Note that although there are eight LEDs, only four Switch units can be stacked at present. Off The Switch is stand-alone. Power/Self Test LED Green The Switch is powered-up. Green flashing The Switch is either downloading software or is initializing (which includes running a Power On Self Test). Yellow The Switch has failed its Power On Self Test. Off The Switch is not receiving power. * If your Switch has 24 10BASE-T/100BASE-TX ports, these ports are numbered 1 to 24. If your Switch has 12 10BASE-T/100BASE-TX ports, these ports are numbered 1 to 12. For both models, ports supplied through an Expansion Module are numbered sequentially from the last fixed port on the front of the unit.