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Implementation and Performance Evaluation of a New ADSL Link Aggregation Model

Implementation and Performance Evaluation of a New ADSL Link Aggregation Model,Daniel J. Edeen,David H. C. Du

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Implementation and Performance Evaluation of a New ADSL Link Aggregation Model  
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ADSL provides up to 8 Meg abits (Mbps) downstream and 1 Mbps upstream, insufficient for many applications. The tran s- mi s sion of High Definition Television (HDTV) requires nearly 20 Mbps with current compression techniques, far exceeding the c a- pabilities of a single ADSL circuit. Num erous link aggregation models have been d e veloped to combine multiple transmission channels into a single, high - speed connection. Some of these models will operate with ADSL, but require constraints on link rates or i n troduce si g nificant additional overhea d. In this paper, we propose a new link aggregation model for ADSL that operates with any co m bination of circuit rates, supports dynamic link rate changes, and requires minimal overhead. We implemented this model using sta n dard ADSL equipment and mea s ured perfor m- ance under a variety of conditions. Our impleme n tation provided a data rate of 20 Mbps at 13,500 feet using four ADSL circuits, with very low latency and jitter. We also tested this model with ADSL2 and ADSL2+ tran s ceivers, demonstrating aggregate d ata rates of 35 Mbps with two circuits and up to 70 Mbps with four ci r- cuits. (HDTV) wi th MPEG - 2 compression requires nearly 20 Mbps (4) - (6), more than twice the maximum rate of an ADSL circuit. Link aggregation models have been developed for a variety of circuit types. These models provide higher bandwidth by co m- bining multiple transmis sion channels into a single, logical co n- nection. In this paper, we propose a new link aggreg a tion model for ADSL that provides unlimited bandwidth, low latency and ji t- ter, and requires minimal overhead. We intr o duce a novel sy m- bol - based synchronization met hod that supports any comb i n a- tion of link rates in the group. We develop protocols to ma n age
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