10PASS-TS is an IEEE 802.3-2008 Physical Layer (PHY) specification for a full-duplex short reach point-to-point Ethernet link over voice-grade copper wiring, used in Ethernet in the first mile applications.
10PASS-TS PHYs deliver a minimum of 10 Mbit/s over distances of up to 750 metres (2,460 ft), using ITU-T G.993.1 (VDSL) 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).
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Unlike other Ethernet physical layers that provide a single rate such as 10, 100 or 1000 Mbit/s, 10PASS-TS link rate can vary, depending on the copper channel characteristics, such as length, wire diameter (gauge), wiring quality, the number of pairs if the link is aggregated and other factors.
VDSL is a short range technology designed to provide broadband over distances less than 1km of voice-grade copper twisted pair line, but connection data rates deteriorate quickly as the line distance increases. This has led to VDSL being referred to as a "Fibre to the curb" technology, because it requires fibre backhaul to connect with a carrier network over greater distance.
VDSL Ethernet in the first mile services using may be a useful way to standardise functionality on Metro Ethernet networks, or potentially to distribute internet access services over voice-grade wiring in multi-dwelling unit buildings. However, VDSL2 has already proven to be a versatile and faster standard with greater reach than VDSL.
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