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About Fast Ethernet
Fast Ethernet is a network technology specified by IEEE Standard
802.3u. It extends the traditional 10Mbps (10 megabit/sec)
Ethernet technology to achieve 100Mbps (100 megabit/sec) trans-
mission and reception. Because Fast Ethernet retains the tradition-
al Ethernet CSMA/CD (Carrier Sense, Multiple Access, Collision
Detect) protocol, it remains wholly compatible with 10Mbps
Ethernet while providing a tenfold increase in network capacity.
The Fast Ethernet standard specifies three subtypes, correspon-
ding to three media types:
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100Base-TX (using two twisted pairs in EIA 568 Category 5
UTP or STP cable)
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100Base-T4 (using four twisted pairs in a Category 3,
Category 4, or Category 5 UTP cable)
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100Base-FX (using two fiber-optic strands.)
The DFE-650TXD provides full-duplex and half-duplex
100Base-TX operation (in Category 5 twisted-pair cable environ-
ments). It does not provide 100Base-T4 or 100Base-FX operation.
To provide for traditional 10Mbps Ethernet operation in twisted-pair
cable environments, the DFE-650TXD also offers 10Mbps
Ethernet operation, in full-duplex and half-duplex modes. The
DFE-650TXD's autonegotiation capability provides for automatic
selection of the best operation mode.
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