Etherstack, Alcatel-Lucent Demo PTT in LTE Using P25 Network (3/11/11)
Friday, March 11, 2011 | Comments

Etherstack and Alcatel-Lucent demonstrated the future of public-safety voice communications by bridging push-to-talk (PTT) voice calls in Long Term Evolution (LTE) with a Project 25 (P25) public-safety digital radio network.

The demonstration showed live PTT calls operating over a P25 public-safety digital radio network, using Etherstack’s P25 soft radio client running on an LTE-enabled PC connected to Alcatel Lucent’s live LTE demo network. Native P25 digital voice calls were initiated at the LTE terminal and then passed from the LTE network to a P25 VHF radio network via Etherstack’s all-IP public-safety softswitch located with the LTE demo system.

The LTE network and P25 network were bridged using the new TIA TR.8 Inter RF Subsystem Interface (ISSI) standard for public-safety network interoperability. In this way, native digital voice coding and encryption remained uncompromised between the two networks.

“Public-safety professionals aren’t going to give up their traditional LMR voice systems right away as they deploy new broadband networks,” said Morgan Wright, Alcatel-Lucent vice president of mission-critical communications. “However, Etherstack’s technology will allow for interoperable voice calls between P25 and LTE right away, as well as providing an important step toward next-generation mission-critical voice over LTE.”

Etherstack’s soft radio client allows any LTE-connected IP device to act as a P25 portable. Etherstack’s P25 network is also backward compatible with other legacy radio systems, allowing for a graceful upgrade to P25 and extensible to Alcatel-Lucent’s LTE.

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