Technology Basics
About Fast Ethernet
Fast Ethernet is a network technology specified by IEEE Standard 802.3u. It
extends the traditional 10Mbps Ethernet technology to achieve 100Mbps
transmission and reception, while retaining the same CSMA/CD Ethernet protocol.
Thus, while Fast Ethernet provides a tenfold increase in network capacity, it is
wholly compatible with traditional 10Mbps Ethernet network facilities. This
compatibility is the key to easy and efficient upgrades to 100Mbps in your network
areas needing greater bandwidth. Upgrading selected areas to Fast Ethernet does
not require hardware or software changes in network areas where traditional
10Mbps Ethernet is providing good service. For upgrading, Fast Ethernet is the
clear choice in terms of cost-effectiveness, as well as convenience and smoothness
in transition.
Category 5 cabling is required for 100Base-TX Fast Ethernet in order to provide full
duplex operation. Full duplex 100Base-TX operation allows simultaneous
transmission and reception, both at 100Mbps, thus providing service potentially
equal to 200Mbps connection.
To provide compatibility in traditional 10Mbps Ethernet environments (where, for
example, DFE-528TX adapters are installed anticipating upgrade of supporting hub
equipment to Fast Ethernet,) the DFE-528TX also supports traditional 10Mbps
Ethernet operation, in full-duplex as well as half-duplex modes. Selection of the
best operation mode in any given installation is automatically governed by auto-
negotiation.
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