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Patent company trolls four

Net Navigation Systems, which sued Cisco in 2011, goes after Arista, Avaya, Ericsson and Extreme

As Arista Networks grapples with its co-founder's lawsuit, the company and three other networking vendors are fending off litigation filed last week by a patent company. Net Navigation Systems LLC, a three-year-old limited liability company based in Round Rock, TX., sued Arista, Avaya, Ericsson and Extreme on April 23 for infringement of the same three patents.

The defendants are accused of infringing U.S. Patent No. 6,625,122 issued Sept. 23, 2003, for Selection of Data for Network Transmission; U.S. Patent No. 6,434,145 B1 issued Aug. 13, 2002, for Processing of Network Data by Parallel Processing Channels; and U.S. Patent No. 5,901,147 issued May 4, 1999, for Apparatus and Methods to Change Thresholds to Control Congestion in ATM Switches.

Net Navigation is requesting a jury trial and seeking compensatory damages, interest, costs, expenses, attorneys' fees and other relief.

Avaya and Extreme said they don't comment on pending litigation. Arista said, "Net Navigation Systems is a non-practicing entity that has filed a series of patent lawsuits against several industry players. Based on our investigation to date, we do not believe that Arista infringes nor that the identified patents which involve ATM technology has any applicability to our products."

Ericsson did not respond by posting time. 

In previous years, Net Navigation also sued AT&T, Alcatel-Lucent, Cisco and Huawei of infringing on four patents: the three above and No. 6,307,860 B1, Systems and Methods for Data Transformation and Transfer in Networks.

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