Pmc-sierra, Inc.

John Richard Bradshaw

Charles Kevin Huscroft

Maher Nihad Fahmi

Vernon Robert Little

David Walden Wong

Brian D Gerson

Jonathan David Loewen

Kenneth M Buckland

Graham B Smith

Jeffery John Brown

Riccardo G Dorbolo

A method or system or apparatus provides improved digital communication. In one aspect, flow control in performed by receiving status preprended to data units in a combined data channel, where the status data indicated the available status of a number of far end receiving channels. Thus data may be sent only to available receiving channels. In a further aspect, a frequency reference may also be transmitted by including data in data units in a combined channel. In a further aspect, an active channel can be selected among two redundant channels by use of an active bit in said data units. The invention has particular applications to ATM-type communication systems and may also be used in other communication systems.

Method and apparatus for interconnection of flow-controlled communication

A user network interface device for interfacing between synchronous optical network (SONET)/synchronous digital hierarchy (SDH) which is characterized by a continuous stream of frames of data and an asynchronous transfer mode (ATM) characterized by a non-continuous stream of cells of data. The user network interface device includes an integral phase lock loop circuit to recover clock and data from an encoded incoming stream of data. In another embodiment, the network interface device synthesizes a high speed transmit clock from a low frequency reference source.

Integrated user network interface device for interfacing between a sonet network and an ATM network

A method and apparatus for traffic control in an ATM-based network is provided to avoid congestion of traffic flows and false identifications of conforming and non-conforming cells.

Method and apparatus for traffic control in a cell-based network

An ATM layer device for interfacing between a physical layer device and an ATM switch, which includes means for prepending and postpending of switch routing information to cells destined to enter the switch and for removing such information from cells having left the switch

ATM layer device

A device for identifying cells as either conforming or non-conforming in a cell-based transmission system, which includes an n-bit word-length counter having an input coupled to a source of clock pulses, a parallel n-word gate coupled to a parallel output of the n-bit word length counter and having a gate input coupled to a source of cell arrival signals. A processor is coupled to an output of gate having a first comparer for comparing TAT and t.sub.a (k), a second comparer for comparing t.sub.a (k)[n-1] with zero and t.sub.a (k-1)[n-1] with 1, a setting device for setting TAT=t.sub.a (k) in the event that either of the comparisons in the first and second comparers are true. A third comparer is provided for comparing TAT and t.sub.a (k)+L and if TAT is less than or equal to t.sub.a (k)+L, an indexing device for indexing TAT by I and declaring the cell conforming, and an output device for declaring the cell non-conforming if TAT is greater than t.sub.a (k)+L.

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Burnaby, Canada

John Richard Bradshaw