The cellular digital packet data (CDPD) is a system which borrows idle radio channels from the existing cellular mobile telephone networks for packet data transmission.
蜂窝数字分组数据(CDPD)是利用现有的模拟蜂窝电话网来传输数据的一种新技术。
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The E-TDMA-based GMH2000 fixed radiosystem developed by Hughes Network Systems (HNS) provides an effective local radio loop solution for the public telephone service.
The progress on the study of radio frequency radiation from mobile telephone influence on the central nervous system and the study matter and resolvent are discussed in the article.