telephone switching system

This paper states the first opened digital railway division communication system which is constructed with Δ M multiplex transmission system and digital division telephone switching system on the toll symetrical cable at Zhengzhou-Luoyang Railway Division.

本文介绍了在郑州&洛阳区段的长途对称电缆上开通的我国铁路第一个数字式区段通信系统，它由△M多路复用传输系统和数字式区段电话交换系统构成。

CDMA Cordless Telephone Switching System

CDMA数字无绳用户交换系统

Semielectronic telephone switching system

半电子制电话交换机

This paper presents a basic method for establishing the simulation models of a telephone switching system by using GPSS-F simulation language.

本文介绍一种应用GPSS-F仿真语言建立一个电话交换系统仿真模型的基本方法。

Toll and local crossbar telephone switching system& Signal marks or colours of lamp and alarm ringer

GB/T2094-1980纵横制长、市话交换设备灯色及警铃信号标志

Recently the communication network faces some new threats. Attacks to the telephone network mainly aim at user terminal device, switching device, database, network management system, signaling system and transmitting device.

近来通信领域出现了一些新的安全威胁对电话网的攻击主要有针对用户终端设备、交换设备、数据库、网管系统、信令系统和传输设备的攻击；

Presently, the algorithm has been successfully implemented in the large-scale SPC telephone switching system DS-30 developed by China.

该算法已经在一台国产大型程控数字交换机DS-30上实现。

The development trends of integrated circuits used in SPC telephone switching systems, system architecture, features and requirements of the switching systems are discussed.

本文对程控数字电话交换机所用的集成电路器件，交换机的系统结构以及性能要求的发展趋势进行了讨论。

This thesis also introduced the wireless PBX system principle of work and the function in detail, and make the improvement in the original telephone switching plan foundation, increased the function of wireless accessing.

本文还详细介绍了无线PBX系统的工作原理和功能，在原有的小型电话交换机方案基础上做了较大的改进，增加了无线接入的功能。

If not, the call went to the company's in-house telephone switching system, or PBX ( private branch exchange).

如果没有，电话就转到公司内的电话交换系统（即PBX，用户电话交换机）。

Over the connectionless IP network, the SIP-based VoIP system provides VoIP services with software exchanges, performing both fixed and mobile telephone switching and transmission functions, only showing differ-ence at access modes.

在无连接的IP网上，基于SIP的VoIP系统用软件交换机提供VoIP业务，既可完成固定电话的交换传输，也可完成移动电话的交换传输，差别仅仅是接入方式不同。