| 1. | Utility telemetry service architecture for switched telephone network
交换电话网络用通用遥测服务结构 |
| 2. | Switched telephone network
交换电话网络 |
| 3. | Terminal equipment . syntax - based videotex lower layer protocols using packet mode access over the public switched telephone network
终端设备.在公共交换电话网络上使用文件包方式存取的基于语法的电视电文低层协议 |
| 4. | Terminal equipment ; syntax - based videotex lower layer protocols using packet mode access over the public switched telephone network ; english version ets 300221 : 1993
终端设备.使用公共交换电话网络分组方式存取的基于语 |
| 5. | Alarm systems - alarm transmission systems and equipment - requirements for systems with digital communicators using the public switched telephone network
警报系统.警报发送系统和设备.使用公共交换电话网络数字通话装置系统的要求 |
| 6. | Alarm systems - alarm transmission systems and equipment - requirements for equipment used in systems with voice communicators using the public switched telephone network
警报系统.警报发送系统和设备.使用公共交换电话网络声音通话装置系统用设备要求 |
| 7. | Alarm systems - alarm transmission systems and equipment - requirements for equipment used in systems with digital communicators using the public switched telephone network
警报系统.警报发送系统和设备.使用公共交换电话网络数字通话装置系统用设备要求 |
| 8. | Every field has its own special computer network , however they still use the switching network of programming control which is provided by the post telephone and telegraph system . the cost of the telephone is a large part in the spending of every department . instructing the switching network to realize the telephone communication needs much of equipment charges , lines charges , protection charges , project charges and time
虽然各行业都有自己的专用计算机网络，但是各行业仍利用邮电系统提供的程控交换电话网络通信，需支付大量的电话费，占用了各部门的很大一部分开销；建立程控交换电话网络实现电话通信需要大量的设备费、线路费、维护费和工程费等费用，并且需要一定的施工工期。 |
