CompCh17-Answers to RQ

CompCh17-Answers to RQ - REVIEW QUESTIONS (COMPREHENSIVE...

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R EVIEW Q UESTIONS (C OMPREHENSIVE C HAPTER 17) Reviewing the Basics 1. Explain why a modem is considered both hardware and firmware. The modem is essentially a hardware device but also contains firmware on ROM chips that contains the protocol and instructions needed to format and convert data so that it can be transmitted over phone lines to a receiving modem on the other end. 2. Converting a digital signal to analog is called ___. Converting analog back to digital is called ___. Modulation, demodulation 3. Communication in only one direction at a time is ___ communication. Communication in both directions at the same time is ___ communication. Half-duplex, full-duplex 4. Why is the maximum transmission rate of today’s modems limited to 56.6 Kbps? Why might a modem not transmit at this speed? Modem transmission rates are limited by the design of the phone lines as well as the method that phone companies use to convert analog to digital. The overhead of data transmission must also be taken into account. All these factors combine to limit modem transmission over a regular phone line to around 56.6 Kbps. Line noise and available wiring can further limit transmission speed so that 56.6 Kbps cannot be attained.
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5. What organization is responsible for setting telecommunications
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CompCh17-Answers to RQ - REVIEW QUESTIONS (COMPREHENSIVE...

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