英语翻译Remarkably,the local-access part of this network has rem

英语翻译
Remarkably,the local-access part of this network has remained relatively unchanged.It requires a twisted copper pair form the serving wire center to the subscriber location.Telecommunications users had to use telephone devices that were hard-wire to the PSTN.This requirement was not acceptable to many users who needed mobility,particularly business people needing to stay touch with a home office.
Personal communications is the concept of anytime,anywhere,anyhow seamless communications.Personal communications users have a mobile device or mobile station(MS)that not only allows them to communicate with clear voice quality but to read and compose text messages,and access a common set ￡ service features like three-way calling no matter where they are.Furthermore,callin progress are not interrupted when travelling between service areas.In short,wireless personal communications systems provide full mobility.
Personal communications services also include a number of advanced data services.Users are able to send and receive text message,read electronic mail,and access the WWW.Wireless service providers are beginning to enhance features by basing them on the location of mobile subscriber and by accessing network databases that probide additional call routing intelligence.Pursuant to a Federal Communications Commission(FFC) mandate (CC Docket 94-102) for improved emergency call response,the location of a mobile emergency 911 caller will be provided to the nearest 125m at least 67% of the time.Furthermore,industry experts predict that intelligent network control functions based on location,dialed digits,time of day,and so on will soon be commonplace.The benefits of mobile communication over wired communications are creating a world where a personal communicator can be viable substitute for a tranditional land line telephone as the primary means of mommunication.