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电话网是传递电话信息的电信网,是可以进行交互型话音通信、开放电话业务的电信网。电话网包括本地电话网、长途电话网、国际电话网等多种类型。是业务量最大、服务面最广的电信网。
电话网经历了由模拟电话网向综合数字电话网的演变。除了电话业务,还可以兼容许多非电话业务。因此电话网可以说是电信网的基础。
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电信支撑网 Telecom munication supporting networks
一个完整的电话网除了有以传递电话信息为主的业务网外,还需要有若干个用以保障业务网正常运行,增强网路功能,提高网 路服务质量的支撑网路。支撑网中传递相应的监测和控制信号。支撑网包括同步网、公共信道信令网、传输监控网和网路管理网等。同步网在数字网中是用来实现数字交换机之间,数字交换机和数字传输设备之间时钟信号速率的同步;在模拟网中通过自动或人工方式校准和控制各主振器,使其频率趋于一致。公共信道信令网专用来实现网路中各级交换局之间的信令信息的传递。传输监控网是用来监视和控制传输网路中传输系统的运行状态。网路管理网主要用来观察、控制电话网服务质量并对网路实施指挥调度,以充分发挥网路的运行效益。
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