Very High Data Rate DSL
Very High Data Rate DSL (VDSL) pushes to the limit what can be transmitted over 24-gauge copper pairs. VDSL's intent is to provide the fastest bit rate regardless of distance, and thereby provide a competitive service to cable by supporting entertainment video. VDSL is enabled due to recent advances in DSP technology, which allow the implementation of sophisticated channel modulation and adaptive equalization schemes. VDSL will modulate single-pair wiring from 300 kHz up to (possibly) 30 MHz over distances from 300 meters to 1000 meters. VDSL starts at 300 kHz to protect the POTS/ISDN service. (Yes, it needs a splitter.) This yields the following service options:
| Upstream | Downstream | Distance |
|---|---|---|
| 12.96 Mbps | 12.96 ... |
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