![]() ![]() In a door-to-door population survey, you will want to capture the location of the household and address, but also information about every member of the family.Let's first review some common scenarios that scream for a repeat: This article covers everything from the basics to the more advanced features of repeats. Repeats are a very powerful feature in Survey123 because they can be configured in many different ways to support different business workflows. It is also used best to decrease the number of copper lines necessary to connect the memory to the other parts of the computer.You can think of XLSForm repeats like sub-forms: A form within a form that can also be completed multiple times. Computer memory – A multiplexer can be used to keep a huge amount of memory in the computer.It allows the transmission of data, such as audio and video data, from different channels via cables and single lines that helps increase the efficiency of the communication system. Communication system – A multiplexer can become a transmission system and a communication network.Transmission from the computer system of a satellite – A multiplexer can be used with a GSM communication to transmit the data signals to the ground system from the computer system of a satellite.Telephone network – A multiplexer integrates the multiple audio signals into a single line of transmission in telephone networks. ![]() ![]() Since a multiplexer allows the transmission of multiple data in a single line, it is preferred for various applications including the following: All the incoming signals are divided into equal fixed-length time slots and then transmitted over a shared medium and reassembled in its original form after de-multiplexing. TDM is also known as digital circuit-switched. It allows the transfer of two or more streaming digital signals in a common channel. TDM is very much different from WDM since the transmissions from multiple sources happen in the same facility but not at the same time. However, each channel occupies a different wavelength, and each wavelength takes a different transmission path. In the above figure, the propagation of each channel takes place in the same transmission medium at the same time. It allows many optical signals to be transmitted simultaneously using a single fiber cable. WDM’s objective is to increase the bandwidth capacity of optical transmission media. These are the two wavelength bands at which the optical fibers have the least amount of signal loss. In WDM, the wavelength spectrum that is used is in the region 1300 or 1500 mm. It is a cooperation of two or more discrete wavelengths into and out of an optical fiber. It sends information signals that initially occupied the same band frequencies through the same fiber at the same time without interference. This produces a double sideband signal, which is then converted to a single-sideband every time it passes through a bandpass filter tuned to give only the upper sideband. In Channel 2, signal amplitude modulates a 105-kHz carrier in the balanced modulator. In Channel 1, signals amplitude modulates a 100-kHz carrier in a balanced modulator that suppresses the 100-kHz carrier. The double sideband waveform is converted to a single sideband signal when it passes through a bandpass filter (BPF). The bandwidth of 10kHz is the output of the balanced modulator in a double-sideband suppressed-carrier waveform. As the figure shows, each channel occupies a different 5-kHz portion from the total combined bandwidth that is equal to 20kHz. ![]()
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