Cisco Technology, Inc.

Avid Technology Limited

Starent Networks Corporation

Hamed Eshraghian

Craig R Frink

Parvez Munir Khan

Raymond D Cacciatore

James Robert Hamilton

Matthew Hayden Harper

Jeffrey D Kurtze

Werner E Niebel

Scott A Markinson

Frank C Sarnowski

Michael F Lamenza

Anthony O'Connor

A data and voice communication system includes communication between a line card and an accelerator card. Voice, data, and control traffic is received from the line card and is transmitted to the accelerator card via a physical link having separate voice, data, and control logical channels. The separate voice, data, and control logical channels are represented by labeled data packets.

Communicating in voice and data communications systems

The present invention relates to a synchronized timestamp mechanism in a packet processing system. This synchronized timestamp mechanism provides a globally synchronized counter value so counters located on separate packet processing cards can be synchronized. The synchronizing of these packet processing cards provides tracking of how long it takes for packets to be processed, provides the ability to generate packet headers that include sequence numbers for robust header compression, and allows the use of encryption protocols without a time reference signal. The synchronization is provided by sending the cards with counter value information and this information can be used to update the card's internal counter value information so that the card is synchronized with other cards.

Globally synchronized timestamp value counter

Card to card communications in voice and data communications systems

A converter for converting serial (e.g. TDM) data streams into parallel (e.g. cell) data is presented. Conversion from cell to TDM format is also disclosed. Methods for converting between serial and parallel data formats are provided. In some applications, communication data streams of digital data may be captured, processed, and stored in one or more of the serial and cell data formats.

System and method for reformatting data

In order to efficiently use processing and transmission bandwidth and data storage of a computer system, video data is represented using integer and fractional values. The integer value has a precision defined by the precision of the data paths of the computer system. These integer and fractional components are packed into byte-oriented data packets in a manner that minimizes waste of storage space and transmission bandwidth. This packing of data also may be done in such a way so as to minimize processing for performing packing and unpacking of the data. Because the video data may be easily separated and combined into its integer and fractional components, these components may be processed or transported separately, in parallel or in series, and then later recombined. As a result, lower precision devices may be used in parallel to process or transport streams of higher precision data without having a high precision data processing or transport path.

Video data storage and transmission formats and apparatus and methods for processing video data in such formats

The present invention provides a generic interface which enables asynchronous data processing elements to be interconnected using an interconnection protocol that controls flow of data between the processing elements. The flow control allows the processing elements to be data independent from, i.e., the processing elements need not be designed for a fixed sample rate or resolution, sample format and other data dependent factors. When used with digital motion video data, the processing elements may process motion video data at various temporal and spatial resolutions and color formats. Flow of data between processing elements may be controlled by handshake signals indicating whether the sender has valid data and the receiver can receive data. When valid data is available at the sender and is requested by the receiver, a transfer of data occurs. The characteristics of the data, and functions to be performed on the data may be specified using control inputs to the processing elements. A counting circuit may be used to specify the number of the data samples for which the control inputs are valid. The interface allows each processing element to have a small number of storage locations for storing data, such as a pair of registers, which eliminates the need for large buffers and simplifies implementation of the processing element with such flow control as a simple integrated circuit.

Apparatus and method for controlling transfer of data between and

Growing community of inventors

Lexington, MA, United States of America

Hamed Eshraghian