The Power-up Sequence 45
Table 18 Cables required to connect the switch to other devices with
auto-negotiation disabled
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.
Cross-over Cable Straight-through Cable
Switch-to-switch
(MDIX to MDIX)
✓ ✕
Switch-to-hub
(MDIX to MDIX)
✓ ✕
Switch-to-PC (NIC)
(MDIX to MDI)
✕ ✓
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