It is most extensively used lines of communication to public switched telephone network ( pstn ) , hence the video surveillance system based on pstn possesses widespread application prospects 公共电话交换网( pstn )是最广泛使用的通信线路，因此在pstn线路上传输视频具有广阔的应用前景。
First public telephone service was introduced into hong kong by oriental telephone and electric company which later became china and japan telephone and electric company Orientaltelephone & electriccompany在本港推出公共电话服务，该公司其后改名为chinaandjapantelephoneandelectriccompany 。
For passengers in wheelchairs , general facilities like lifts , drinking fountains and public telephones are designed at an accessible height . there are disabled toilets in the terminal 一般设施如升降机、饮水器及公共电话等的高度，均适合使用轮椅的旅客，机场大楼亦设有特别为残疾人士而设计的洗手间。
For passengers in wheelchairs , general facilities like lifts , drinking fountains and public telephones are designed at an accessible height . there are disabled toilets in the terminal 一般设施如升降机、饮水器及公共电话等的高度，均适合使用轮椅的旅客，机场大楼亦设有特别为残疾人士而设计的洗手间。
If you want to make an international call directly from the public phone , look for a gray phone that says " international & domestic cardcoin telephone , " or an orange - colored ic phone that accepts ic telephone card 用公共电话拨打国际电话时，使用写有“ international & domesticcardcointelephone ”的灰色电话和ic卡电话，可以直接拨通。
Public automatic branching exchange ( pabx ) a telephone system installed in atcx for efficient communications between operational positions in the atcx and external parties through the public service telephone network . microwave link system ( mls ) 这套在航空交通管制大楼内安装的电话系统，可为管制岗位提供更有效率的内部通讯，同时，透过公共电话网络服务，也可对外作快捷的通话。
Short message service ( sms ) over mobile network has become one of the most popular wireless services . recently , china telecom offers sms as a profitable added - value service that allows text messages to be sent and received over the pstn 在移动短消息日渐被人们所接收，并在国内外通信市场取得巨大成功以后，中国电信推出了固网短信业务作为公共电话交换网络( pstn )的一项增值业务。
A few visits to web - based public directories ( or local libraries and records offices ) can yield addresses and phone numbers past and present , date of birth , employers , mother ' s maiden name and similar vital personal data 只要到网路上的公共电话簿（或者是当地的图书馆及档案室）走一遭，就可以得到某人过去和现在的地址及电话号码、出生日期、雇主、母亲结婚前的姓氏，以及其他重要的个人资料。
