32 CHAPTER 2: INSTALLING THE SWITCH
Tab l e 7 Cables required to connect the Switch 4400 to other devices if
auto-negotiation is 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. If you do not,
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.
Choosing the Correct
Cables
(Switch 4400 FX)
All of the ports on the front of the Switch 4400 FX are 100BASE-FX MT-RJ
multi-mode ports. The MT-RJ port is a small form factor fiber-optic port
with the transmit and receive fibers in the same cable. Unlike many
fiber-optic systems, only one MT-RJ cable is needed to connect two MT-RJ
ports together.
To connect a front-panel port to another 100BASE-FX MT-RJ multi-mode
port, or to a patch panel, a single MT-RJ multi-mode pinless jumper cable
is required. Since standard MT-RJ cables are cross-over cables, no
Auto-MDIX sensing is required. The maximum cable length is
2 kilometers (1.24 miles).
CAUTION: Do not connect pinned MT-RJ connectors into any port on the
Switch 4400 FX as this may damage the unit. The ports have locator pins
fitted and are designed for standard (pinless) connectors.
To connect a front-panel port to a 100BASE-FX single mode port, or to a
port that does not have an MT-RJ connector, an adaptor will be required.
It is not possible to connect a front panel port to a 1000BASE-FX port.
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)
✕
✓
DUA1720-3AAA09.book Page 32 Wednesday, July 6, 2005 4:33 PM
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