SMC Networks SMC7500A/VCP - Manual (Page 16)

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VDSL delivers high-performance online applications, such as high-quality
video and other switched multimedia services. SMC’s Ethernet VDSL
CPE system provides robust performance, with a symmetric data rate up
to 15 Mbps, and a range up to 1770 m (5800 ft). SMC’s system is based on
advanced VDSL QAM (Quadrature Amplitude Modulation) technology
with adaptive channel equalization that overcomes bridge taps and other
line distortions. Reed-Solomon Forward Error Correction and interleaving
protects against errors due to impulse noise, and enables recovery from
signal interruptions. Frequency Division Duplexing (FDD) separates
downstream and upstream channels and allows VDSL signals to coexist
with regular telephone services. A power back-off mechanism is also
implemented to reduce noise from crosstalk in line bundles.
Features and Benefits
VDSL features (CPE side) include:
• High-speed Internet access over existing phone lines
• VDSL connection provides the following rate/range options:
• Concurrent data and telephone services (voice/ISDN) over a single
connection
• Always-on digital connection eliminates dial-up delays, providing
transparent reconnection when initiating a network request
• Supports evolving ETSI, ANSI, and ITU VDSL standards for the
copper local loop
Rate Mode Max. Range
15 Mbps Symmetric 1070 m (3500 ft)
10 Mbps Symmetric 1220 m (4000 ft)
5 Mbps Symmetric 1370 m (4500 ft)
4 Mbps downstream
1 Mbps upstream Asymmetric 1770 m (5800 ft)