The engineer has solved the technical problems of the newly manufactured cell phone jammer

Frequency division multiplexing transmission medium bandwidth generally than the bandwidth required for a given signal, the bandwidth of the transmission medium will generally exceed the bandwidth required for a given signal, if the media transmit multiple signals simultaneously, if the medium of transmitting several signals, each signal in different carrier frequency modulation, and completely independent of each carrier frequency, carrier frequency modulation, and is completely independent of each carrier frequency, ie the formation of the carrier signal does not overlap, that is, the formation of the carrier signal does not overlap, the brightest signal can be successfully transmission on the media. successfully transmitted on the media. The engineer has solved the technical problems of the newly manufactured cell phone jammer. Frequency Division Multiplexing is mainly used for analog circuits, such as cable TV systems. Frequency Division Multiplexing is mainly used for analog circuits, such as cable television system 1, frequency division multiplexing Bandwidth reuse technology after the original wave after wave 2 wave frequency division, time division multiplexing TDM: time division multiplexing: All users at different times occupied the same frequency band width of the band width of 3, wavelength division multiplexing wave Division Multiplexing is an optical carrier is not just transmitted all the way, WDM is a fiber-optic transmission is not only the way the carrier is the simultaneous transmission of different wavelengths of light more than one carrier, while several different wavelengths of light transmission the carrier. The factory has put forward more requirements for     cell phone jammer . WDM optical domain is essentially the frequency-division multiplexing, wavelength division multiplexing optical domain is essentially the frequency-division multiplexing, each wavelength divided by the frequency-domain realization of wavelength division actually long division by frequency-domain implementation of the frequency split. data exchange shortly after the advent of the telephone, people discovered that shortly after the advent of the telephone, people will find to make all of the connected phone are twenty-two is unrealistic. twenty-two connected machines is unrealistic when the number of telephone number, when the increase in the number of telephone time, we must use many switches connected to each other to complete the task of the whole network of exchange. with This way to the switch to complete the task of the whole network of exchange. In this way, they constitute a global coverage of the telecommunications network. The customer has strict requirements for the quality of     cell phone jammer     . Constitute a global coverage of the telecommunications network. Three ways of switching circuit switching packet switching storage - forward switching store-forward switching circuit switching packet switching 2.5.1 People in the use of circuit switching, it must go through three steps of the people in the use of circuit-switched networking, the way , called connection-oriented. , Is known as connection-oriented. Three steps: the release of the connection → Communication → Connect "three steps:" to establish a connection → Communications → release connection "circuit-switched advantages and disadvantages of advantages: direct transfer of all data, transmission delay, the advantages: all data directly, the transmission delay small, and the data transfer sequence. sequentially transfer Cons: long lines on-time, exclusive channels, Disadvantages: a long line on-time, exclusive channels, all the time in the call, time, call the two users are always end of the fixed transmission bandwidth occupied is not conducive to increase line utilization.Customer Service Department has summarized all requirements of the customer about    cell phone jammer and made them into a report.
transmission bandwidth does not help to improve line utilization. 2.5.2 Packet Switching Usually we will want to send the entire block of data called a packet, usually we want to The entire block of data sent as a message. message exchange between the two sites do not need a dedicated channel in each node.