Wolf, Greenfield & Sacks, P.C.
In, or relating to, VDSL
Zipper is the time-synchronized frequency-division duplex implementation of discrete multi-tome (DMT) modulation. Two communicating Zipper modems transmit DMT symbols simultaneously with a common clock. When all transmitters are time synchronized, the near end cross-talk (NEXT) and near end echoes injected into the received signal are orthogonal to the desired signal. The present invention provides a telecommunications transmission system using zipper and having at least two VDSL systems. Each VDSL system comprises a pair of zipper modems communicating over a cable transmission path. The telecommunications transmission system handles zipper transmission transmitted over the common cable; at least partly mitigates NEXT; and permits transmissions in a first VDSL system which are asynchronous with transmissions in a second VDSL system.
STMicroelectronics NV
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Per Mikael Göran Daniel Rickard Gunnar Lennart Magnus Frank
Ödling Isaksson Ökvist Bengtsson Nilsson Bahlenberg Olsson Johansson Sjöberg