In 1998, ETSI publicized TETRA protocal, which is a standard of digital trunked radio communication system.

TETRA协议是欧洲电信标准协会(etsi) 1998年公布的一种数字集群通信系统标准。

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As one of the most famous kinds of digital trunked communication system, TETRA's efficiency and security have been cared more and more.

TETRA作为最著名的数字集群通信系统之一，其高效性和安全性得到了越来越多的关注。

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Therefore, it has practical significance to develop TETRA digital trunked system equipment which has independent intellectual property rights.

因此，开发具有自主知识产权的TETRA数字集群系统设备具有实际意义。

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Digital trunked radio is employed throughout the federal government for the most sensitive of communications that involve the protection of the President, military operations, anti-terrorist surveillances, and criminal investigations.

FORBES: Free Speech v. Denial Of Communications For Public Safety Agencies?

In 2000, our Governor determined that we should implement the first statewide digital trunked radio system in the United States, utilizing primarily Motorola mobiles, portables and base station equipment which was then state of the art.

FORBES: Free Speech v. Denial Of Communications For Public Safety Agencies?

Trunked radio is digital, allows more efficient use of spectrum, and does not tie a radio to a specific talk channel.

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