thousands of users must share the limited bandwidth on the same trunk line, which to the contrary also produces serious accumulated noises . in the worst case, even the analog phone service could not be offered 原因很簡(jiǎn)單,成千上萬個(gè)用戶必須分享同一干線上的有限帶寬,同時(shí)在干線上還將產(chǎn)生嚴(yán)重的噪聲積累;嚴(yán)重情況下,甚至連模擬電話業(yè)務(wù)也難以提供。
due to being longer established in some countries, analog networks may offer better coverage than digital networks, however analog phones are less secure and suffer more from interference where the signal is weak 由于模擬網(wǎng)絡(luò)在一些國(guó)家建立的時(shí)間較長(zhǎng),所以它可能比數(shù)字網(wǎng)絡(luò)的覆蓋面更寬,然而,模擬手機(jī)的安全性較差,且在信號(hào)較弱的情況下下更容易受到干擾。