Choosing The Correct Fiber Cables; Switch 4950 - Gbic Operation; Approved Gbic Transceivers - 3Com 3C17700 - SuperStack 3 Switch 4900 Getting Started Manual

Choosing the Correct
Fiber Cables
Switch 4950 GBIC
—
Operation
Approved GBIC
Transceivers
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.
If your Switch has fiber ports you can choose from the following cable
options:
The 1000BASE-SX ports can be connected to multimode fiber cables
only.
The 1000BASE-LX and 1000BASE-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
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.
The following sections describes how to insert a GBIC transceiver into a
GBIC port on a Switch 4950.
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.
The following list of approved GBIC transceivers is correct at the time of
publication.
3CGBIC91 GBIC (SX)
3CGBIC92 GBIC (LX)
3CGBIC97 GBIC (LH70)
Switch 4950 — GBIC Operation 29