10Base-T Operation - 3Com 3C905C-TX-M User Manual

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10BASE-T Operation

10BASE-T is the Institute of Electrical and Electronics
Engineers (IEEE) 802.3 standard for Ethernet signaling
over unshielded twisted-pair wire at 10 Mbps.
Ethernet, as the most widely used network protocol,
uses 10BASE-T as its primary cabling scheme. Ethernet
characteristics include:
The 10BASE-T name indicates a signaling speed of
10 Mbps and twisted-pair wiring. Base stands for
baseband, which denotes a technique for transmitting
signals as direct-current pulses rather than modulating
them onto separate carrier frequencies.
A wiring topology using 10BASE-T specifies a wiring
hub, cable arranged in a star configuration, and unshielded
twisted-pair cable. Each node has a separate cable run that
must not exceed 100 meters (328 ft) from the node to
the hub.
Traditional telephone cable.
Data transmissions up to 4 MHz.
Voice and data transmission up to 25 MHz. The cable
typically has four pairs of wires. Category 3 is the
most common type of installed cable found in older
corporate wiring schemes.
Voice and data transmission up to 33 MHz. The cable
normally has four pairs of wire. This grade of UTP is
not common.
Voice and data transmission up to 125 MHz. The cable
normally has four pairs of copper wire and three twists
per foot. Category 5 UTP is the most popular cable
used in new installations today.
A data rate of 10 Mbps.
A broadcast architecture.
A specific media-access control (MAC) scheme.
Cabling Requirements 83