3Com 5500-EI Getting Started Guide - Page 45

The Power-up Sequence 45 Table 18 Cables required to connect the switch to other devices with auto-negotiation disabled Switch-to-switch (MDIX to MDIX) Switch-to-hub (MDIX to MDIX) Cross-over Cable ✓ ✓ Straight-through Cable ✕ ✕ Switch-to-PC (NIC) (MDIX to MDI) ✕ ✓ CAUTION: If you want to install the switch using a Category 5E or Category 6 cable, 3Com recommends that you briefly connect the cable to a grounded port before connecting network equipment, otherwise the cable's Electrostatic Discharge (ESD) may damage the switch's port. You can create a grounded port by connecting all wires at one end of a UTP cable to an earth ground point, and the other end to a female RJ-45 connector located, for example, on a switch rack or patch panel. The RJ-45 connector is now a grounded port. WARNING: The Switch 5500G-EI supports Power over Ethernet on all front ports. The Switch 5500 PWR supports Power over Ethernet on the 10/100 ports only. Use these ports for Ethernet wiring within the same building only. Choosing the Correct Cables for the 1000BASE-X SFP Ports The 1000BASE-SX SFP transceiver supports a direct connection to a multi-mode fiber-optic cable. The 1000BASE-LX SFP transceiver supports a direct connection to single-mode and multi-mode fiber-optic cables. The 1000BASE-LH70 SFP transceiver supports a direct connection to a single-mode fiber-optic cable. The 1000BASE-T SFP transceiver uses Category 5 copper cabling with RJ-45 connectors and supports segment lengths of up to 100 m (328 ft). Table 14 describes the port cable range for each connection.