電話交換機系統(tǒng)的不同種類及特點

There are two different types of telephone exchange systems in Ji'nan, which are digital and analog. So what are the different features of the two types?

現(xiàn)階段人們使用的大部分程控交換機是IP程控交換機，還有純IP電話的軟交換設備，即服務器。從交換方式上來看，數(shù)字式和模擬式的電話程控交換機是有區(qū)別的，前者和的是時分交換，而后者使用的是空分交換。前者使用的是無阻塞的交換方式，而后者則有可能會產(chǎn)生通話繩路上的限制。

At this stage, most of the program control switches are IP SPC switches, and the soft switching devices of pure IP phone, that is, the server. In terms of exchange mode, there are differences between digital and analog telephone program-controlled switches. The former is time division switching while the latter uses air division switching. The former uses non blocking switching, and the latter may produce restrictions on the call line.

模擬式的電話程控交換機一般通話的質(zhì)量差一些，而且很可能會被外界干擾，而且功能也比較少，傳輸距離有限。如果在現(xiàn)階段128分機以下的話，交換機有部分使用的是模擬式的還有一些企業(yè)使用的是數(shù)字式的程控交換機。

Analog telephone program-controlled switchboard usually has poor quality of call and is likely to be disturbed by the outside world, and its function is relatively limited, and the transmission distance is limited. If the current phase is below 128, the switch is partially analog and some companies use digital SPC switches.

數(shù)字式的交換機機會有數(shù)字分機的接口提供，也能夠模擬分機的接口，可以滿足大多數(shù)的用戶需求。對于IP交換機而言，當用戶在布線時，只需要一條網(wǎng)線就可以，在電話的別一條需要接電腦，用戶布線成本及維護成本得到了有效節(jié)約。

Digital switch opportunities are provided by digital extension interface, and can also simulate the interface of the extension, which can meet the needs of most users. For IP switches, when users are wiring, only one wire can be used. One of the phones needs to be connected to the computer, and the cost of user wiring and maintenance is effectively saved.

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