4links Limited

Canon Kabushiki Kaisha

4 Links for Technical Help

4link Ltd.

Christopher Paul Hulme Walker

Barry Michael Cook

Laurent Frouin

Arnaud Closset

Sylvain Buriau

There is disclosed a method and apparatus for recovering data from a received signal, the received signal including a first signal comprising data bits and a second signal having transitions at data bit boundaries of the first signal where there is an absence of transitions, the method comprising: receiving the first signal; receiving the second signal; sampling the first signal to detect an edge transition of the first signal; sampling the second signal to detect an edge transition of the second signal; wherein on an active edge of either said first or said signal, the current value of the first signal is recovered as a received data bit.

Communication system

A coding method for a sequence of elements that can be equal to at least two distinct values, the elements forming at least one input symbol. The coding method comprises a stretching step of stretching at least one of the input symbols, to form a stretched symbol, such that the stretched symbol does not have any successive transitions. The coding method further comprises a cancelling step of canceling the disparity of the stretched symbol to form a coded symbol, such that the coded symbol comprises approximately the same number of elements of each value.

Coding and decoding method for a sequence of elements, signal, coder, decoder, corresponding computer programs and storage means

A communications system includes tow high speed communication links formed by pairs of transformers at either end thereof. A phantom circuit formed by the pairs of transformers is used to distribute power to devices connected to the high speed links. In transmission part of a communication system, data is transmitted under the control of a continuously variable frequency clock. The transmission is on parallel data-strobe links, and the receive includes circuitry to identify on which parallel the data signal is preset. A method and circuitry is provided for transmitting and receiving dc balanced data strobe signals.

Communication system for driving pairs of twisted pair links

A communication. system includes two high speed communication links formed by pairs of transformers at either end thereof. A phantom circuit formed by the pairs of transformers is used to distribute power to devices connected to the high speed links. In transmission part of a communications system, data is transmitted under the control of a continuously variable frequency clock. Transmission is on parallel data-strobe links, and the receive includes circuitry to identify on which parallel the data signal is preset. A method and circuitry is provided for transmitting and receiving dc balanced data strobe signals.

In a routing switch a technique for routing messages from an input port to an output port involves storing a plurality of sets of routing information in the routing switch, each set associated with a value of a header of the message. The technique involves grouping outputs which are suitable for outputting the same message. In the routing network, unicast packets include multiple headers and multicast packets include single headers. Sequence numbers of packets in the message are encoded in the packets by use of a longitudinal checksum. In the routing switch, messages are prioritized for routing in dependence on a priority allocated to the respective header.

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Milton Keynes, United Kingdom

Christopher Paul Hulme Walker