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Cisco and Verizon Ventures led a $25 million investment for Kumu Networks, the wireless design startup announced today. Deutsche Telekom and Swisscom also participated in the series C round.

Kumu Networks said it developed a telecommunications technology called Full Duplex, which “doubles the capacity of existing wireless spectrum” and enhances existing LTE by canceling “self-interference.”

Kumu Networks had partnered with Deutsche Telekom to test the startup’s technology.

“Full Duplex offers significant advantages and removes roadblocks from wireless endeavors as diverse as LTE Advanced, general Radio Frequency planning and future standards and protocols,” said Rachid El Hattachi, Deutsche Telekom’s senior VP of architecture and blueprints, in a statement.

To date, Kumu Networks has raised at least $45 million.

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