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