Amamodeli wokudayela avuleleke kumamodemu wokuphambana okusheshayo okusheshayo
I-modem idivaysi ye-hardware evumela ikhompiyutha ukuba ithumele futhi ithole idatha phezu komugqa wocingo noma ikhebula noma uxhumano lwe-satellite. Endabeni yokudlulisela phezu komzila wocingo lwe-analog, owawuyindlela evelele kakhulu yokufinyelela kwi-intanethi, i-modem iguqula idatha phakathi kwamafomu e-analog namadijithali ngesikhathi sangempela sokuxhumana kwenethiwekhi ezimbili. Uma kwenzeka imodemu ye-digital ijubane kakhulu ethandwa namuhla, isignali ilula kakhulu futhi ayidingi ukuguqulwa kwe-analog-to-digital.
Umlando weModemu
Amadivaysi okuqala abizwa ngokuthi ama-modems aguqule idatha yedatha yokudlulisela phezu kwemigqa yocingo ye-analog. Isivinini salezi modemu sasiqalwa ngokomlando ku-baud (i-unit of measure ebizwa ngokuthi u-Emile Baudot), nakuba ubuchwepheshe bekhompuyutha bukhulile, lezi zinyathelo zaguqulwa zibe yizicucu ngomzuzwana . Iimodemu zokuqala zokuthengisa zisekela isivinini se-110 bps futhi zisetshenziswe uMnyango wezokuVikela wase-US, izinsizakalo zezindaba kanye namanye amabhizinisi amakhulu.
Amamodeli kancane kancane ajwayele abathengi ngasekupheleni kweminyaka engu-70 ukuya kuma-80s njengoba amabhodi omlayezo womphakathi kanye nezinsizakalo zezindaba njengeCompuServe zakhiwe engqalasizinda ye-intanethi yokuqala. Khona-ke, ngokuqhuma kweWorld Wide Web maphakathi no-1990, ama-modem wokudayela avela njengendlela eyinhloko yokungena kwe-inthanethi emakhaya amaningi emhlabeni jikelele.
Amamodeli wokudayela
Amamodeli wendabuko asetshenziselwa ukuguqula amanethiwekhi aguqule idatha phakathi kwefomu le-analog elisetshenziselwa imigqa yocingo kanye nefomu ledijithali elisetshenziswa kuma-computer. I-modem yangaphandle yokudayela ixhuma kwikhompyutha ekupheleni komunye nomugqa wocingo ngakolunye uhlangothi. Esikhathini esedlule, abanye abenzi bekhompuyutha bahlanganiswe imodemu yangaphakathi yokudayela ngaphakathi kumiklamo yabo yekhompyutheni.
Amamodeli wenethiwekhi ye-dial-up yanamuhla adlulisela idatha ngesilinganiso esiphezulu sama-56,000 amabhuzu ngomzuzwana. Kodwa-ke, ukulinganiselwa okulinganiselwe kwamanethiwekhi ocingweni womphakathi kuvimbela ukulinganisela kwedam data rates kuya 33.6 Kbps noma ephansi ekusebenzeni.
Uma uxhuma kwinethiwekhi nge-modem yokuzula, amadivayisi ngokuvamile adlulisa ngesipikha imisindo ehlukile edalwe ngokuthumela idatha yedijithali ngaphezu komzila wezwi. Ngoba inqubo yokuxhuma kanye namaphethini wedatha afana njalo, ukuzwa iphethini yomsindo kusiza umsebenzisi ukuqinisekisa ukuthi inqubo yokuxhuma isebenza.
Amamodeli we-Broadband
I- modem ye-broadband efana nalabo asetshenziselwa i-DSL noma ukufinyelela kwe-intanethi ye-intanethi isebenzisa amasu okusayinwa okuthuthukisiwe ukuze kuzuzwe ngesivinini esikhulu senethiwekhi kunamamodeli wendabuko. I-modems ye-Broadband ivame ukubizwa ngokuthi i-modems esheshayo. I-modems yeselula inguhlobo lwe-modem yedijithali elungula uxhumano lwe-intanethi phakathi kwedivayisi yeselula nenethiwekhi yocingo .
I-modems yangaphandle yokuxhumeka ixhumeke ku- router yasekhaya yasendaweni noma kwenye idivaysi yesango langasese ekhaya ekupheleni komunye kanye nesikhombikubona sangaphandle se-intanethi njengelayini lekhebula ngakolunye uhlangothi. I-router noma isango liqondisa isignali kuwo wonke amadivayisi ebhizinisini noma ekhaya njengoba kudingeka. Amanye ama-router e-broadband afaka i-modem ehlanganisiwe njengeyunithi eyodwa yehadiwe.
Abahlinzeki abaningi be-intanethi ye-broadband banikeza i-modem efanelekayo kumakhasimende abo mahhala noma ngemali yenyanga. Noma kunjalo, imodemu evamile ingathengwa ngokusebenzisa izindawo zokudayisa.