由于人们对自由方便通信的需求,发展了无绳电话,去掉了电话绳对人的束缚。无绳电话从单信道发展到多信道自动搜寻,从低频率发展到高频率(几十MHz到几百MHz)。目前模拟无绳电话从技术上讲已经很成熟,并无太多发展空间。为满足人门的进一步需要,发展了数字无绳电话技术。现在国际上主要数字无绳电话技术方案有DECT、PHS和PACS等。 DECT技术由欧洲国家于80年代 Because of the need for free and convenient communication, people have developed cordless phones and removed the bondage of the telephone to people. Cordless phones have evolved from single-channel to multi-channel automatic search, from low frequencies to high frequencies (tens of MHz to hundreds of MHz). The current analog cordless phone is technically mature and there is not much room for development. In order to meet the further needs of people, digital cordless telephone technology has been developed. The major digital cordless telephone technology solutions in the world now include DECT, PHS and PACS. DECT Technology by European Countries in the 1980s