Can digital data be transmitted using analog transmission? What device is needed to make it possible?
Use answer e. to illustrate. Yes. You need to encode using a modem. • What is the fundamental difference between analog transmission and digital transmission? Analog transmission is not aware of signal content when signal attenuate, they are boosted using amplifiers. Digital transmission takes signal content into account. The digital data is recovered using repeaters. • Data from an analog information source needs to be transmitted over a satellite microwave network using digital transmission. How should the data be encoded to make this possible? Analog source => Digitized using a modem => Modulated onto wave for transmission. • Give an example of an everyday service that uses analog transmission. Cable, TV, PSTN. • Give an example of an everyday service that uses digital transmission. Direct satellite broadcast, ISDN. • State three services that a data link protocol supplies to sending and receiving devices to help them coordinate and communicate. • Flow control • Error control • Sync
