Ciena Corporation

Ronald Arthur Frank

Stephen Kieran Anthony Adolph

Barry Leo Pelley

Germain Paul Bisson

Stephen Knobel

Jim Chi-Luen Yau

An apparatus and method for detecting and suppressing corrupted data frames transported from a SONET network to a receiver utilizing the SOF frame indicator to manage the buffer-to-buffer credit count. By verifying the integrity of the SOF frame indicator prior to forwarding it to the client receiver the apparatus and method ensure that the buffer-to-buffer credit count integrity is maintained while avoiding the introduction of latency.

Apparatus and method for efficient detection and suppression of corrupted fibre channel frames in a protected transmission medium

A method and system for in-service reallocation of bandwidth (i.e. STS-1's) in a synchronous optical network (SONET) i.e. without interruption of the transport of data frames transmitted from a transmit node and received at a receive node, the transmit node comprising a mapper/aggregator, a first bandwidth configuration memory associated with the mapper/aggregator and a transmit framer and the receive node comprising a demapper/deaggregator, a second bandwidth configuration memory associated with the demapper/deaggregator and a receive framer. First and second memory banks are provided to the first and second bandwidth configuration memory, whereby the first memory bank of the first bandwidth configuration memory comprises current bandwidth allocation mapping information used by the mapper/aggregator and the first memory bank of the second bandwidth configuration memory comprises current bandwidth allocation mapping information used by the demapper/deaggregator. Updated bandwidth allocation mapping information is provided to the second memory banks. A bandwidth reconfiguration update request is generated and a reconfiguration flag is generated at the transmit node in response to the update request. The reconfiguration flag is transmitted from the transmit node to the receive node and the reconfiguration flag is detected at the receive node. The updated bandwidth allocation mapping information of the first bandwidth configuration memory's second memory bank is selected for use by the mapper/aggregator in response to the generation of the reconfiguration flag and the updated bandwidth allocation mapping information of the second bandwidth configuration memory's second memory bank is selected for use by the demapper/deaggregator in response to the detection of the reconfiguration flag.

System and method for in-service reconfiguration of a synchronous optical communications network

A method and apparatus are provided for flexible time-division multiplexing, and demultiplexing, of serial line data, from 1-n client lines, based on the SONET standard (e.g. OC-48 or OC-192) whereby a predetermined and reconfigurable number of STS-1s are allocated to each client. A multiplexer includes 1 to n mappers for mapping the data of 1 to n clients, according to a predetermined bandwidth allocation, to an N&#xd7;STS-1 SONET payload, each mapper using y STS-1s where y is 0 to N, the y STS-1s being selected on a sequential or non-sequential concatenation basis from the N STS-1s. Each mapper maps the data of one client and each allocated STS-1 is allocated to one client and the total number of STS-1s allocated to the clients is less than or equal to N. An aggregator aggregates the mapped data into a composite STS payload comprising N STS-1s. A bandwidth allocation receiver receives the bandwidth allocation. The bandwidth allocation may be received from a source external to the multiplexer and the source may be a network controller. A demultiplexer includes a deaggregator for deaggregating the STS payload to provide the mapped data for the clients. 1 to n demappers demap the client data according to the predetermined bandwidth allocation. A bandwidth allocation receiver receives the bandwidth allocation.

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Calgary, Canada

Ronald Arthur Frank