3com DUA1770-0AAA04 Manual De Usuario
28
C
HAPTER
2: I
NSTALLING
THE
S
WITCH
Table 7 Cables required to connect the Switch 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.
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.
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
Fiber Cables
If your Switch has fiber ports you can choose from the following cable
options:
options:
■
The 1000BASE-SX ports can be connected to multimode fiber cables
only.
only.
■
The 1000BASE-LX and 1000BASE-LH70 GBIC ports use multimode or
single-mode fiber optic cables.
single-mode fiber optic cables.
CAUTION: 3Com recommends that you use MT-RJ cables that do not
contain alignment pins as these are provided by the fiber socket. Cables
that contain alignment pins can cause damage to your Switch.
contain alignment pins as these are provided by the fiber socket. Cables
that contain alignment pins can cause damage to your Switch.
For detailed information on fiber cable specifications, refer to the
SuperStack 3 Implementation Guide on the CD-ROM that accompanies
your Switch.
SuperStack 3 Implementation Guide on the CD-ROM that accompanies
your Switch.
If you wish to connect a 1000BASE-SX MT-RJ port to a fiber port with a
different type of connector, for example, SC or ST please contact your
network supplier for a suitable patch cable.
different type of connector, for example, SC or ST please contact your
network supplier for a suitable patch cable.
Cross-over Cable
Straight-through Cable
Switch to Switch
(MDIX to MDIX)
(MDIX to MDIX)
✓
✕
Switch to Hub
(MDIX to MDIX)
(MDIX to MDIX)
✓
✕
Switch to PC (NIC)
(MDIX to MDI)
(MDIX to MDI)
✕
✓