dial



Definition

Dial-upisthemethodandprocessofusingtelephonelinestoconnecttotheInternet.

Inordertousethedial-upmethodtoconnecttotheInternet,thehardwaredevicethatneedstobeequippedisamodem,whichisusedtoconvertthedigitalsignalofthecomputerandtheanalogsignalofthetelephoneline.Aftertheuserusesamodemtoconnecthiscomputertothetelephoneline,hedialsatelephonenumbertotheremotehosttoestablishaconnectionwiththehost.

Duringthephonedialingprocess,dialingreferstodialingthenumbersonthedialpadaccordingtothephonenumber.

Dialingmethod

Thedialingmethodisawayforuserstodialadecimalnumbertomakelocalcalls,domesticlong-distancecalls,andinternationallong-distancecalls.ThedialingmethodofGSMmobilecommunicationstipulatedbythetechnicalsystemofChina'smobilecommunicationnetworkis(takeChinaMobileNetworkasanexample):

Mobileuser-fixeduser(includinganalogmobileuser)0XYZPQRABCD;

Fixeduser-localmobileuser139ABCD;

Fixeduser-non-localmobileuser0139ABCD;

Mobileuser-mobileuser139ABCD;

Mobileuser-specialserviceserviceOXYZlXX,inwhichyouonlyneedtodial119forfirealarm,110forpolice,and120foremergencycenter,Tothetrafficpolicecenteronlyneedtodial122;

Internationaluser-mobileuserinternationallongdistancerightprefix+139ABCD;

Mobileuser-internationaluser00+Countrycode+Avalidphonenumberinthecountry.Amongthem

0——Domesticlong-distanceauthorizedprefix;

00——Internationallong-distanceauthorizedprefix;

XYZ——long-distanceareacode,whichis3Digitsor2digits;

PQR——officenumber;

ABCD——usernumber,whenthelongdistanceareacodeis2digits,theusernumbercanconsistof4or5digitsNumbercomposition;

LXX——specialservicenumber.

BecausethenetworkaccessnumberoftheGSMmobilecommunicationnetworkis"139","139"notonlyhasthecharacteristicsofaspecialservicenumber,butalsohasthecharacteristicsofalong-distanceareacode.Becausebothinternationalanddomesticlongdistancesareanalyzed"139"andthenconnectedtoChinaMobile'sGSMmobilecommunicationnetwork.

Accordingtothetechnicalsystemofmycountry’stelephonenetwork,thedialingmethodisalockeddialingmethod,thatis,whenuserscalleachotherinalockednumberingarea(along-distancenumberingareaisalockednumberingarea),thereisnoneedtodialLong-distanceareacode,andwhenusersintwolocked-numberedareascalleachother,theymustdialthelong-distanceareacodeofthecalledlockedarea.

Therefore,whenamobileusercallsafixedtelephonenetworkuser,usersintwolockednumberingareascommunicatewitheachother.Themobileuserneedstodialthelong-distanceareacodewherethecalledfixeduserislocated.

Conversely,whenafixeduser(includingananalogmobileuser)callsamobileuser,thetwointerlockeduserscancommunicatewitheachother.Thefixedusershoulddialthemobileuser’s"long-distanceareacode"139,butbeforethelong-distanceareacodeYouneedtoaddthelongdistanceprefix"0"toknowthatthenumberafterthe"0"isthelongdistanceareacode.

Inthisway,aproblemarises,thatis,whereverafixedusercalls,amobileusermustfirstdial"0139".Limitedtothelargenumberoffixedusersonthepublictelephonenetworkinmycountry,theyarealsonon-long-distanceauthorizedusers.Thebusinesslocalnetworkisthesameasthefixedtelephonelocalnetwork.Therefore,non-long-distanceauthorizedfixeduserscancalllocalfixedtelephoneusersbutcannotcallmobileusersofthelocalGSMmobilecommunicationnetwork.Thisisobviouslyunreasonable,anditwillbringtothetelecommunicationsbureau.Thereisabigbusinessloss.

ABCD,atthistime139hasthespecialservicenumbercharacteristics;whencallingmobileusersoutsideofthecountry,thelongdistanceprefix"0"mustbedialedbefore139,atthistime139hasthelongdistanceareacodecharacteristics.

Dial-upprocess

Figure1Dial-upprocess(7photos)

Createadial-upnetwork,enterInternetaccountconnectioninformation;

Configuredial-upNetwork,selectTCP/IPprotocol;

ConfigureTCP/IP,dial-upconnection;

Thedial-upprocessisshowninFigure1ontheright.

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