Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. 2BASE-TL is an IEEE 802.3-2008 Physical Layer (PHY) specification for a full-duplex long reach point-to-point Ethernet link over voice-grade copper wiring. 2BASE-TL PHYs deliver a minimum of 2 Mbit/s over distances of up to 2.7 km (9 kft), using ITU-T G.991.2 (G.SHDSL.bis) technology over a single copper pair. These PHYs may also support an optional aggregation or bonding of multiple copper pairs, called PME Aggregation Function (PAF). Unlike 10BASE-T, 100BASE-T and 1000BASE-T PHYs, providing a single rate of 10, 100 or 1000 Mbit/s respectively, 2BASE-TL link rate can vary, depending on the copper media characteristics (such as length, wire diameter or gauge, number of pairs if the link is aggregated, amount of crosstalk between the pairs, etc.), desired link parameters (such as desired SNR margin, Power Back-Off, etc.), and regional spectral limitations.

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