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我厂于1985年3月从加拿大引进一套格兰纳尔(Glenayre)公司的无线电自动拨号通信系统,目前处在全面国产化阶段。GL—1200系统是一种移动通信系统,可工作于150、450MHz频段,或在一个通信网内UHF与VHF频段混合使用。其信令方式主要为IMTS,但机内软件也兼容MTS、DTMF、SMART、二音、五音/六音、2805等信令。根据用户需要增设相应的硬件电路板,系统可工作于多种信令。基本信道数为8,可扩充到12,两个GL—1200联用,更换另一种软件,系统可扩充到24个信道。用户可以是全双工电台、半双工电台和袖珍铃,用户数最多为800。基地台功率有50、75、120、250W等任其选用,可组成大区制小容量的移动通信网。该系统的核心设备是GL—1200无线电话控制终端,它与市话局的连接方式采用中继线进网,因此适用于中小城市的公用网。如果与某企业的PABX相接,则可组成企业专用网,也能进入市话网。在必要情况下,可将12个信道分成若干个地区,在同一终端控制下分区各自运行。
I plant in March 1985 from Canada to introduce a Glenayre company’s radio automatic dial-up communication system, is currently in full localization stage. The GL-1200 system is a mobile communication system that operates in the 150,450 MHz band or mixes in the UHF and VHF bands within a communications network. The signaling method is mainly IMTS, but the machine software is also compatible with MTS, DTMF, SMART, two tone, five tone / six tone, 2805 and other signaling. According to user needs additional hardware circuit board, the system can work in a variety of signaling. The basic number of channels is 8, expandable to 12, two GL-1200 together, replace another software, the system can be expanded to 24 channels. Users can be full-duplex, half-duplex and pocket-sized bells, with up to 800 users. Base station power 50,75,120,250 W, such as any of its selection, can form a small system of regional capacity mobile communication network. The core equipment of this system is the GL-1200 wireless telephone control terminal. Its connection to the local exchange office uses trunks to access the network. Therefore, this system is suitable for public networks in small and medium-sized cities. If connected with a company’s PABX, you can form a corporate network, but also into the local network. If necessary, 12 channels can be divided into several areas, under the control of the same terminal partition operation.