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采用900MHz频段的系统 本文以Motorola的系统为例,介绍该类系统的组网结构和通信方式。 1.系统特点 Motorola的无线CONCERT！~(TM)系统是一种窄带个人通信系统,可提供不对称的大容量双向数据传输。 该系统是以本地网为基础的分布式系统。可以组织区域联网和全国联网,其上、下行频率均采用900MHz频段,编码采用ReFLEX~(TM)25协议。
System using 900MHz band In this paper, Motorola’s system, for example, describes the type of system networking and communication. 1. System Features Motorola’s wireless CONCERT! ~ (TM) system is a narrowband personal communication system that provides asymmetric, high-capacity bi-directional data transmission. The system is a local area network-based distributed system. It can organize regional networking and national networking. The frequency of uplink and downlink is 900MHz, and the encoding adopts ReFLEX ~ (TM) 25 protocol.