VDSL Vs G.fast | Difference Between VDSL And G.fast

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VDSL vs G.fast | difference between VDSL and G.fast

This page compares VDSL and G.fast and mentions difference between VDSL and G.fast. The other difference between terms are provided here.

Both VDSL and G.fast are digital subscriber line standards used for data transmissions. Let us understand main difference between VDSL and G.fast.

Specifications VDSL G.fast
Full form Very high bit rate digital subscriber line Fast access to subscriber terminals
Frequency up to 30MHz 2 to 106 MHz , 2 to 212 MHz planned for future profiles
Maximum data rate 100 Mbps in both upstream and downstream (VDSL2) 1 Gbps over distance of 70meter 800 Mbps over distance of 100 meters 500 Mbps over old shielded type of cable (distance of 100 meters)
Modulation type DMT (Discrete multi-tone modulation) e.g. OFDM (Orthogonal Frequency Division Multiplexing) OFDM , Refer FDM vs OFDM
Number of sub carriers in a FFT 4K 2K (in 106MHz profile)
Duplexing method FDD (Frequency Division Duplex) TDD (Time Division Duplex), Refer TDD vs FDD
OFDM symbol time approx. 250 µSec (in 17MHz profile) pprox. 20 µSec
Vectoring method using ITU-T G.993.5 supported along with adaptations required for high frequency
Transmit power It depends on profile, 14.5 dBm 4 dBm
FEC type RS Coding (Reed Solomon Coding), trellis coding RS Coding (Reed Solomon Coding), trellis coding
bits per DMT frequency carrier 15 (in VDSL2) 12
Impulse Noise Protection Available in VDSL2 Available
Standard ITU-T G.993.2, ITU-T G.993.5 ITU-T G.9700, G.9701

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