International Business Machines Corporation

Cisco Technology, Inc.

Spiros Joseph Teleoglou

Edward Stanely Suffern

Edward Stanley Suffern

Emmanuel Lancon

Clement Y Poiraud

Jeffrey W Reedy

Alan B Mann

Clement Yvon Gustave Poiraud

Alexander J Ra

A method and apparatus for use where an incoming high speed data stream is first divided into N lower bandwidth channels and is then transmitted through the network to a receiver where it arrives with varying delays depending on the physical characteristics of the network. The high speed data stream is reconstructed by determining the different geographical delay parameters among the lower speed channels, by adjusting the transmission delays by alignment circuitry, and then by combining the lower speed signals into one high bandwidth channel. When one of the lower speed channels fails, the bandwidth is automatically re-adjusted using the remaining N&minus;1 lines. When the failed channel is restored to an acceptable level of service, the communication protocol automatically re-adjusts the bandwidth to the full N channels. When the network indicates the loss of a line, the multiplexers at both ends of the link automatically compensate for the loss without any message exchange. When the line is restored, the multiplexers at both ends of the link automatically re-adjust the bandwidth.

System and method for recovering and restoring lost data in a N-channel coherent data transmission system

A method and system aggregate data on multiple physically separate lower-speed E1/J1 channels of a communications network to generate higher bandwidth. A high speed data stream is first divided into lower bandwidth channels and transmitted through the network. The data arrives with varying delays depending on the physical characteristics of the network. Low bandwidth channels are aggregated together into a high bandwidth channel by determining the different geographical delay parameters among the lower speed channels, adjusting the transmission delays by alignment circuitry, and then combining the lower speed signals into one high bandwidth channel for the user. The transmission delay adjustment consists in adding a pseudo-random noise pattern to each of the lower bandwidth channels, measuring the time difference among all the channels, and then adjusting the time differences in the received data stream so that the combination of the signals produces a coherent higher bandwidth data stream. Because of the enhanced delay compensation mechanism, there is virtually no distance limitation in the transmission of data and if one of the lower physical telecommunication lines becomes inoperative, bandwidth recovery is provided.

System and method for creating N-times bandwidth from N separate

Low bandwidth telecommunications channels are transformed into a high bandwidth telecommunications channel by determining the relative transmission delays among a plurality of relatively low bandwidth channels which are to be combined into a relatively high bandwidth communications channel. The transmission time delay across the plurality of low bandwidth channels is then equalized so that the time delay equalized low bandwidth channels combine to effectively form a single high bandwidth channel. The relative transmission time delays among the low bandwidth channels may be determined by transmitting an alignment (synchronization) signal across each of the low bandwidth channels, receiving the alignment signal from each of the low bandwidth channels, and measuring the time differences among the received alignment signals at each of the low bandwidth channels. Based on the measured time differences, time delay across the plurality of low bandwidth channels is equalized, so that the transmission time delay equalized low bandwidth channels may be combined to effectively form a single high bandwidth channel.

Method and apparatus for transforming low bandwidth telecommunications

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Raleigh, NC, United States of America

Spiros Joseph Teleoglou