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IEEE 802.3 100Base-T2

A consortium of IBM and Booktree has developed the 100 Mbit/s technology(100Base-T) on simple Category 3 UTP cable, over two pairs of wires; hence the designation T2.

Physical interfaces of Fast Ethernet

Physical interfaces of Fast Ethernet

Since this technology was previously considered unfeasible, a working group was set up in the IEEE to promote the standardization of this 100-Mbit/s technology over Cat 3 cables. This topic is particularly topical in the USA, where there is a broad base of installed 10Base-T connections over such Cat-3 cables.

For transmission, a pulse amplitude modulation, the PAM5x5 method, with five different levels is used. With simultaneous transmission on two lines, 25 different signal points can be transmitted in this way.

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Englisch: IEEE 802.3 100Base-T2
Updated at: 03.03.2008
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