Overture Gets Circuit Emulation Patents

Overture Networks has been awarded two patents for breakthroughs in circuit emulation pseudo-wire technology

May 4, 2004

3 Min Read

RESEARCH TRIANGLE PARK, N.C. -- Overture Networks, a leading developer of packet-based multi-service access platforms, today announced that the U. S. Patent and Trademark Office has awarded the company two patents for breakthroughs in circuit emulation pseudo-wire technology, or sending circuit traffic over packet-switched networks.

The advantages of using a packet-based transmission technology are speed, flexibility and reduced cost. However, packet-based networks also have limitations, especially when used for circuit-based services. In these situations IP networks must emulate the characteristics of circuit-switched connections where traffic may consist of voice, video or data. Until now, circuit emulation pseudo-wire technology fell short because it failed to meet the rigorous quality of service parameters required to support these traffic types and could not guarantee delivery of toll-quality circuits. The recently issued patents resolve these inadequacies and place Overture Networks at the forefront of metro-edge platform technology.

U.S. Patent No. 6,531,926 titled, "Dynamic Control of a Phase-Locked Loop," describes a proprietary method that Overture Networks employs to dynamically and automatically adjust the parameters of Phase-Locked Loops (PLLs), such as those found in circuit emulation systems. This method enables the adjustment of parameters in response to changes in the packet delay variation (PDV) of a real-time data stream. This represents a major improvement over today's fixed PLL parameters that do not operate optimally because they cannot adapt to a changing environment.

The second patent, U.S. Patent No. 6,728,209, titled "Measurement of Packet Delay Variation," describes a unique process that Overture Networks uses to measure the PDV experienced by packets crossing a network - whether they arrive in order or out of order with some packets missing. This real-time measurement of PDV is crucial in determining a network's quality of service or triggering a dynamic adjustment in networking equipment to maximize packet-based network performance.

This patented technology on the measurement of PDV, combined with other filings pending with the U.S. Patent and Trade Office, allows Overture Networks ISG family of multi-service access platforms to automatically adjust its operational parameters in response to actual traffic conditions. Importantly, all changes take place without operator intervention and without affecting transported traffic. These innovations make fixed configurations obsolete. An operator no longer needs to calculate, estimate or guess the correct settings for edge devices, making setup and installation of products using this technology truly plug and play.

The technology covered by these granted and pending patents is currently incorporated into Overture Networks entire line of ISG products, including the company's flagship product, the ISG 5000.

"These two patents build on our strength and technological leadership in circuit emulation and pseudo-wires," said Prayson Pate, Overture Networks vice president of engineering. "These groundbreaking advances allow carriers using Overture Networks platforms to leverage their investment in networks optimized for data to transparently deliver traditional T1 and E1 circuit-based services over Ethernet, IP or MPLS networks. They can now deliver these circuit services, whether carrying voice, video or data, with the same uncompromising quality and robustness as a circuit delivered in native TDM over SONET and SDH."

Overture Networks Inc.

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