Data to SignalConversionBaqui AbdullahGrantham University Data to SignalConversionAnalog data translated into digital data and digital datatranslated into analog data for processing is a staple of data communications.
The convergence of the digital world and analog world depends on the conversionof both analog and digital data. Bandwidth, accuracy, noise and distortionrejection, size, weight, and power consumption are among the crucial benchmarksfor the analog/digital conversions. Computer systems, routers, switches, and soon, have or will have built-in coder-decoders (codec) and with DSL modems andthe like, it modulate-demodulate thesignal for airwave transmission. (Keller2009).When transferring analog/digital data from one location to another,the electronic equipment transmitting the signal, either using a physicalmedium or using a wireless medium over the air, the electronic equipment determinesthe type of signals the medium can transmit (Goleniewski 2001). Using theexample in Figure 1, a profile request moves from the computer workstation throughthe corporate LAN to a DSL modem on to the Internet through another DSL modemto retrieve the requested profile from a mainframe database.Using a network application foraccessing the mainframe computer database of corporate profiles, the “requestfor a profile” is sent. It is demonstrated in an ASCII condensed form as”reque” as shown in Figure 2 and transmitted through the corporate LAN.
In this example, the LAN usesdifferential Manchester encoding and is converted to a digital signal as ittravels over the LAN to another computer that is connect to the DSL modem (usingonly the first letter, “R” for demonstration purposes and shown in Figure 3). 0 1 1 1 0 0 1 0 Figure 3. Thefirst letter of the message “R” using differential Manchester encoding. The computer connected the DSL modem, converts data messageback to ASCII and transmits the string of ASCII on to the DSL modem.
Utilizingfrequency modulation, the modem formulates a signal of the message for Internettransmission. The frequency modulated signal travels to the appropriate ISP’sgateway that converts it back to ASCII and on out onto the Internet. In thisexample, Figure 1, it arrives are the DSL modem and is converted to ASCII andinto the mainframe database to retrieve a profile.Conclusion Convertingbetween two signals types, digital and analog are a fact of networks. Severalsignals conversion takes place between the request and retrieval of a corporateprofile from a mainframe database as seen in Figure 1.
Depending on theequipment, analog and digital signal transmission takes place to retrieve theprofile. Whether analog or digital, the electronic exchange of data transformsto signals for transmission. ReferencesGoleniewski, L.(2001, December 28). Analog and digital transmission | Telecommunicationstechnology fundamentals. Informit.com.
retrieved fromhttp://www.informit.com/articles/article.aspx?p=24687=5.Keller, J.(2009).
Signal conversion comes to grips with a network-centric world. Military& Aerospace Electronics, 20(8), 22.