Common ways to classify switches

Cabling Logic controls (wlc,wired Logic control) It is the logical control function of the switch by wiring, usually the switch still uses the electromechanical connector and the control part is updated into the electronic device.

On the control mode, mainly divided into two major categories:

1, Wiring logic control (wlc,wired Logic controls) it is through wiring to realize the logic of the switch function, usually the switch still use electromechanical connectors and the control part of the update to electronic devices, so called it as dispatched half electronic switch, This switch is relative to the electromechanical switch, although the device and technology to the electronic forward a big step, but it basically inherited and retained the crossbar switch dispatched way of the drawbacks, large volume, business and maintenance function is low, lack of flexibility, so it is only electromechanical to the evolution of the electronic type of the product of the transition.

2, the Storage Program control (spc,stored) It is the user's information and switch controls, maintenance management functions in advance into the program stored in the computer's memory. When the switch is working, the control part automatically monitors the user's state change and the dialed number, executes the program according to the request, thus completes each kind of exchange function. Usually this kind of switch belongs to the whole electron type, adopts the program control method, therefore is called the Memory Program control switch, or the abbreviation is the SPC Exchange.

The program-controlled switchboard can be divided into local telephone, long-distance and user switch.

According to the method can be divided into air and time switch.

The program-controlled switchboard can be divided into: analog switch and digital switch by information transmission mode.

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Because the continuous network (or switching network) of the programmable Air separation switch adopts an air separation connector (or an intersection switch array), and in the speech section of the general transmission and exchange of analog voice signals, so the custom is called program-controlled analog switch, this switch does not need to carry out the voice of the Analog-to-digital conversion (codec), the user circuit is simple, and thus low cost , and is currently used primarily as a small capacity analog user switch.

The program-controlled time switch is generally used to transmit and exchange the analog voice signal in the section of the channel, so it is called programmed Digital switch, and with the rapid development and wide application of digital communication and pulse coded modulation (PCM) technology, the advanced countries of the world have been developing the digital program-controlled switchboard with great enthusiasm After a hard effort,

France first successfully opened the world's first programmable digital switching system E10 in 1970 in Lagnon (Lanion), marking the exchange of technology from the traditional analog exchange into the digital exchange era.

Because of the advanced nature of the programmable digital exchange technology and the economical nature of the equipment, the telephone exchange has stepped up a new step, and has laid the foundation for the opening of the non-speech business and the realization of the integrated service digital Exchange, which has become the main development direction of the exchange technology, with the rapid development of The superiority of the program-controlled digital exchange is becoming more and more obvious. At present, the production of the large capacity of the program-controlled switches are all digital.

After the 90 's, our country gradually appeared a batch of self-developed large and medium-sized capacity of the international advanced level of digital control Board with the switch, such as the Shenzhen Huawei Company's C&C08 series, Xi ' an Datang SP30 series, Shenzhen zhongxing ZXJ series, etc., the emergence of these switches, Shows that in the field of narrowband switches, our country's research and development technology has reached the world level.

With the development of the Times, the current switching system is gradually integrating ATM, wireless communication, access network technology, HDSL, ASDL, video conferencing and other advanced technologies. As you can imagine, future switching systems will be more than just voice transmission systems, but a high bit broadband transmission system that includes sound, text, and images, and goes deep into millions of households. IP Telephony is an example of its application. The world's traditional switch manufacturers are currently working hard to develop, and through the cooperation and exchanges with computer manufacturers to achieve this goal.