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28 CHAPTER 2: INSTALLING THE SWITCH
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
Choose from the following cable options:
■ The 1000BASE-SX ports can be connected to multimode fiber cables
only.
■ The 1000BASE-LX and LH70 GBIC ports use multimode or
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.
For detailed information on fiber cable specifications, refer to the
Implementation Guide 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.
GBIC Operation The following sections describes how to insert a GBIC transceiver into a
GBIC port.
GBIC transceivers are hot-insertable and hot-swappable. You can remove
them from and insert then into any GBIC port without having to power
down the Switch.
Approved GBIC
Transceivers
The following list of approved GBIC transceivers is correct at the time of
publication.
WARNING: The Switch must only be fitted with 3Com approved GBIC
transceivers, as listed below.
■ 3CGBIC91 GBIC (SX)
■ 3CGBIC92 GBIC (LX)
■ 3CGBIC97 GBIC (LH70)
These are correct at the time of publication.