数字通信的利与弊英语作文

Digitalcommunicationhasbothadvantagesanddisadvantages.

Theadvantagesareasfollows:1、Strong

anti-interferenceability,especiallyafterthedigitalsignalisregeneratedbyrelay,thenoiseaccumulationcanbeeliminated.2、Digitalsignalcanimprovethe

reliabilityofcommunicationthrougherrorcontrolcoding;3、digitalcommunicationtransmissiongenerallyadoptsbinarycode,computerscanbeusedtoprocessdigitalsignals,realizecomplexlong-distancelarge-scaleautomaticcontrolsystemandautomaticdataprocessingsystem,andrealizecomputer-centeredcommunicationnetwork.4、Indigitalcommunication,allkindsofmessages(analoganddiscrete)canbetransformedintounifieddigitalsignalsfortransmission.Inthesystem,digitalsignalscanbeusedformonitoringsignals,controlsignalsandservicesignalsofdigitalsignaltransmission.ISDN,whichiscomposedofdigitaltransmissionanddigitalswitchingtechnology,automaticallytransforms,synthesizes,transmits,processes,storesandseparatessignalsfromdifferentsourcestorealizevariousintegratedservices.5、digitalsignalsareeasytobeencrypted,sotheconfidentialityofdigitalcommunicationisstrong.

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Thedisadvantagesofdigitalcommunicationareasfollows:1、Lowfrequencybandutilization:indigitalcommunicationsystem,duetothebandwidthoccupiedbydigitalsignals.2、Thesystemequipmentisrelativelycomplex:inthedigitalcommunicationsystem,inordertoaccuratelyrecoverthesignal,thereceivingendneedsastricttimesynchronizationsystemtomaintainstrictbeatconsistencyandgroupingconsistencybetweenthereceivingendandthesendingend.

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