3Com 3C16475BS User Manual - Page 11

Status Meaning Flashing Yellow Packets are being received or transmitted on the port at 10 or 100 Mbps Flashing Yellow to Port disabled or link loopback error Green Off The link has not been established, either nothing is connected to the port, or there is a problem: ■ Verify that the attached device is powered on ■ Verify that the cable or fiber is the correct type and is not faulty ■ For fiber connections, ensure that the receive (RX) and transmit (TX) cable connectors are not swapped If these checks do not identify the cause of the problem, it may be that the unit or the device connected to the port is faulty. Contact your 3Com network supplier for further advice. (4) 10/100/1000BASE-T/SFP Ports Ports 25 and 26 are combination Gigabit RJ-45 ports with shared Small Form Factor Pluggable (SFP) transceiver slots. If an SFP transceiver (purchased separately) is installed in a slot and is active, the associated RJ-45 port of the same number is disabled. The 1000BASE-T RJ-45 ports support automatic MDI/MDI-X operation, so you can use straight-through or crossover cables for all network connections to workstations or servers, or to other switches or hubs. Physical Features 11 The two SFP ports support fiber Gigabit Ethernet short-wave (SX) and long-wave (LX) SFP transceivers in any combination. This offers you the flexibility of using SFP transceivers to provide connectivity between the Switch and remote 1000 Mbps workgroups or to create a high-capacity aggregated link backbone connection. SFP ports are numbered 25 and 26 on the Switch. When an SFP port is active, it has priority over the 10/100/1000 port of the same number. The corresponding 10/100/1000 port is disabled when an SFP transceiver is plugged in. (5) Power LED The Power LED shows the power status of the Switch. Status Green Off Flashing Green Yellow Meaning The unit is powered on and ready for use The unit is not receiving power: ■ Verify that the power cord is connected cor- rectly ■ If the unit still does not operate, contact your 3Com network supplier ■ Power-on self-test is in progress ■ Power-on self-test or loopback test failed. Switch is in fail-safe mode.