Intel Corporation

Cortina Systems Corporation

Micron Technology Incorporated

Inphi Corporation

Other

Juan-Carlos Calderon

Jean-Michel Caia

Jing Ling

Soowan Suh

Arun Zarabi

Vivek Joshi

Anguo Tony Huang

Arash Farhoodfar

Steve John Clohset

Alejandro Lenero Beracoechea

Vasan Karighattam

Rodrigo Gonzalez

Michael Raymond Miller

Aws Shallal

Mark T Feuerstraeter

Dennis Albert Doidge

Eduard Lecha

Edward J Pullin

Theron Paul Niederer

Augusto Alcantara

Jasson Flinn

Scott Feller

Anguo Huang

There are various drawbacks by using existing OTN (Optical Transport Network) frames for communication between OTN cards. Such drawbacks might for example include high latency, low robustness, and/or high coding rate. According to embodiments of the present disclosure, systems and methods are provided for modifying an OTN frame (or creating a new frame with data from the OTN frame) prior to transmission by an OTL (Optical channel Transport Lane) in order to address some or all of the foregoing drawbacks. Note that this embodiment can make use of existing hardware (e.g. hardware used for generating the OTN frame, and the OTL used for transmission).

Apparatus and method for forward error correction over a communication channel

Flexible rate communication signalling apparatus and methods are disclosed. A determination is made as to a set of one or more of first frames and second frames which would provide a desired communication rate. The first frames and the second frames have a common frame structure but different associated rates. The determined set of one or more of the first frames and the second frames, including received client signals, is generated.

Flexible rate communication signalling

Provided is an apparatus and method for transmitting data over a communication channel having at least one physical lane for transmitting data. The apparatus includes, for each physical lane, allocation circuitry configured for allocating data in logical lanes corresponding to the physical lane. The apparatus also includes, for each physical lane, a multiplexer configured for bit-interleaving the data from the logical lanes corresponding to the physical lane into interleaved data for transmission over the physical lane. In accordance with an embodiment of the present disclosure, for each physical lane, the allocation circuitry is configured for allocating the data such that the interleaved data for transmission over the physical lane has clusters of sequential bits of the same symbol. Thus, upon transmission and reception by a receiver, any correlated errors affecting sequential bits may affect fewer symbols. Also provided is an apparatus and method for receiving data in a complementary manner.

Apparatus and method for communicating data over a communication channel

In one embodiment, a method includes receiving a plurality of data frames representing at least one virtually concatenated data stream, storing the plurality of data frames in a memory; and recording, for each of a plurality of data frames, a physical write address that indicates a position in the memory and a virtual write address that includes a multiframe indicator and a byte number indicator.

Differential delay compensation

Despite a recent revision, IEEE 1588&#x2122;-2008 does not provide a complete implementation for PTP (precision time protocol) that accounts for variable delays introduced by network components. According to a broad aspect, the present disclosure provides implementations that account for variable delays introduced by network components. Therefore, the amount of time that a packet spends in transit through a transparent clock can be accounted for. According to another broad aspect, there is provided a master-slave mode that allows a transparent clock to function as a master or a slave to another clock.

System and method for accounting for time that a packet spends in transit through a transparent clock

In one embodiment, a method includes recording, for each of a plurality of data frames, a virtual write address including a multiframe indicator and a byte number indicator; and reading a group of associated data frames identified by corresponding multiframe indicators and byte number indicators. The reading is based on determining a minimum write address from a plurality of physical write addresses in the group of associated data frames by comparing virtual write addresses of all members in the group.

There are disclosed systems and methods for reducing the average delay and the average delay variation of network communication data in a buffer. The buffer comprises a plurality of memory entries, and associated with the buffer is a read point and a write pointer. The buffer has a depth defined as the number of memory entries in the buffer between the memory entry pointed to by the read pointer and the memory entry pointed to by the write pointer. In one embodiment, at least one of the read pointer and the write pointer is initially set to establish the depth of the buffer to be a first value. The variation of the depth of the buffer is then monitored for a predetermined period of time as network communication data flows through the buffer. The depth of the buffer is then reduced based upon this monitoring.

Reducing delay and delay variation in a buffer in network communications

Signal format conversion apparatus and methods involve converting data signals between a first signal format associated with a first reference clock rate and a second signal format that is different from the first signal format and is associated with a second reference clock rate different from the first reference clock rate. A period of the second signal format is changed to match a period of a third signal format by controlling a synchronized second reference clock rate that is applied in converting data signals between the first signal format and the second signal format. The synchronized second reference clock rate is different from the second reference clock rate and is synchronized with a third reference clock rate. The third reference clock rate is associated with the third signal format. Such synchronization simplifies conversion of signals between the second and third signal formats.

Signal format conversion apparatus and methods

In one embodiment, a method comprises receiving a plurality of data frames representing at least one virtually concatenated data stream, storing the plurality of data frames in a memory; and recording, for each of a plurality of data frames, a physical write address that indicates a position in the memory and a virtual write address that includes a multiframe indicator and a byte number indicator.

A method of manufacture a transport network system includes: receiving input data having an input encoding; generating encoded data, having a transcode encoding, from the input data; generating an error correction redundancy for the encoded data; and sending an output frame, having the encoded data and the error correction redundancy, for increasing a net coding gain of the output frame based on the transcode encoding and the error correction redundancy.

Transport network system with transparent transport and method of operation thereof

A method and apparatus for processing at least two types of payloads received at varying intervals in a communications network using a single processing path is provided. The two types of payloads may include virtually and contiguously concatenated payloads according to SONET/SHD architecture. The method comprises interleaving data in a predetermined format and controlling distribution of the data irrespective of the format received such that the data can be processed at the destination and passed to downstream components.

Method and apparatus enabling concurrent processing of contiguously and virtually concatenated payloads

A method and apparatus for determining a loss of alignment defect in a communications network employing virtually concatenated payloads is provided. The method and apparatus comprise performing specific evaluations and assessments of conditions under normal conditions as well as evaluations and assessments under LCAS conditions where additional members may be added using the LCAS ADD state.

Method and apparatus for detecting and managing loss of alignment in a virtually concatenated group

A method and apparatus for transferring data traffic, such as in a SONET/SDH environment, is provided. Two designs are presented, each utilizing a dual device design, where one device performs GFP Framing and the other device performs GFP-T adaptation. The method and apparatus include a first device having a first device FIFO, the first device configured to receive data and assemble data into packets and transfer data across a packet interface when the first device FIFO contains more than N bytes. A second device comprises a second device FIFO, the second device configured to receive data packets from the packet interface and utilize a plurality of thresholds to maintain a quantity of data in the second device FIFO within a predetermined range. Depending on the design employed, control codes, such as 65B_PAD control codes, may be added in the first device under certain conditions to facilitate data transfer.

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Fremont, CA, United States of America

Juan-Carlos Calderon