I-CDMA, emele i- Code Division Multiple Access , iyinhlangano yekhono lezinsizakalo ze-cell phone elincintisanayo ku- GSM , izinga elijwayelekile kakhulu lomakhalekhukhwini elisetshenziswa kabanzi.
Cishe uzwe ngalezi zici lapho utshele ukuthi awukwazi ukusebenzisa ifoni ethile kwinethiwekhi yakho yeselula ngoba basebenzisa ubuchwepheshe obuhlukile obungavumelani. Isibonelo, ungase ube nefoni ye-AT & T engasetshenziselwa inethiwekhi yeVerizon ngalesi sizathu.
Umthamo we-CDMA owenziwe yiQualcomm e-US futhi ngokuyinhloko isetshenziswe e-US nakwamanye amazwe ase-Asia ngabanye abathwali.
Yiziphi izinethiwekhi eziyi-CDMA?
Ezingxenyeni ezinhlanu ezithandwa kakhulu zamaselula, nansi ukuhlukana okuyi-CDMA ne-GSM:
I-CDMA:
- Sprint
- I-Verizon engenantambo
- Virgin Mobile
I-GSM:
- T-Mobile
- I-AT & T
Ulwazi oluthe xaxa ku-CDMA
I-CDMA isebenzisa inqubo "ye-spread-spectrum" lapho amandla okusakaza kagesi esakazeka ukuze avumele isignali nge- bandwidth ebanzi. Lokhu kuvumela abantu abaningi kumakhalekhukhwini amaningi ukuba "multiplexed" phezu kwesiteshi esifanayo ukuze bahlanganyele umkhawulokudonsa wama frequencies.
Nge-technology ye-CDMA, amaphakethe wedatha nezwi ahlukaniswa ngokusebenzisa amakhodi bese esetjenziswa ngokusebenzisa ibanga elibanzi lemvamisa. Njengoba isikhala esiningi sinikezwa idatha nge-CDMA, lesi simiso sathandwa ukusetshenziswa kwe -intanethi yeselula ye- 3G .
I-CDMA ne-GSM
Abasebenzisi abaningi cishe akudingeki bakhathazeke ngokuthi iyiphi inethiwekhi yocingo abayikhethayo ngokweziphi ubuchwepheshe obuhle. Noma kunjalo, kuneminye imibono eyinhloko esizoyibuka lapha.
Ukuhlanganisa
Ngenkathi i-CDMA ne-GSM incintisana ngokuya ngesivinini esiphezulu se-bandwidth, i-GSM ine-cover global ephelele ngenxa yokuzulazula kanye nezinkontileka zokuzulazula emhlabeni jikelele.
Ubuchwepheshe be-GSM buvame ukumboza izindawo zasemaphandleni e-US ngaphezulu ngokuphelele kune-CDMA. Ngokuhamba kwesikhathi, i-CDMA inqobe ubuchwepheshe obungaphansi kwe- TDMA ( Time Division Multiple Access ), obufakwe kwi-GSM ephakeme kakhulu.
Ukuvumelanisa kwedivayisi kanye namakhadi e-SIM
Kulula kakhulu ukushintshanisa amafoni kumanethiwekhi we-GSM ngokumelene ne-CDMA. Lokhu kungenxa yokuthi amafoni we-GSM asebenzisa amakhadi e-SIM akhiphekayo ukuze agcine ulwazi ngomsebenzisi kunethiwekhi ye-GSM, kuyilapho amafoni we-CDMA engayenzi. Esikhundleni salokho, amanethiwekhi we-CDMA asebenzisa ulwazi kumkhakha wesiphakeli othintekayo ukuqinisekisa uhlobo olufanayo lwemininingwane yamafoni we-GSM agcinwe kumaSIM khadi abo.
Lokhu kusho ukuthi ama-SIM khadi kumanethiwekhi e-GSM ayashintshana. Isibonelo, uma kunethiwekhi ye-AT & T, ngakho-ke unayo ikhadi le-AT & T efonini yakho, ungayisusa bese uyifaka efonini ehlukile ye-GSM, njengefoni ye-T-Mobile, ukudlulisa lonke ulwazi lwakho lokubhaliselwa ngaphezulu , kubandakanya inombolo yakho yefoni.
Lokhu okusebenza ngempumelelo kukuvumela ukuthi usebenzise i-T-Mobile ifoni kunethiwekhi ye-AT & T.
Ukushintsha okunjalo okulula akunakwenzeka ngamafoni amaningi e-CDMA, noma ngabe anezinombolo ze-SIM ezikhishwayo. Esikhundleni salokho, ngokuvamile udinga imvume yenkampani yenethiwekhi yakho ukwenza lokho kushintshaniswa.
Njengoba i-GSM ne-CDMA engavumelani, awukwazi ukusebenzisa ifoni ye-Sprint kunethiwekhi ye-T-Mobile, noma ifoni ye-Verizon Wireless ne-AT & T. Okufanayo kuya kunoma iyiphi enye ingxube yedivaysi kanye nenkampani yenethiwekhi ongayenza ohlwini lwe-CDMA ne-GSM kusuka phezulu.
Ithiphu: Amafoni we-CDMA asebenzisa ama-SIM amakhadi enza kanjalo noma ngabe izinga le-LTE liyadinga noma ngoba ifoni ineSIM slot ukwamukela amanethiwekhi angaphandle kwe-GSM. Lezo zithwali, noma kunjalo, zisasebenzisa ubuchwepheshe be-CDMA ukugcina imininingwane yobhalisile.
Ukusetshenziswa kwezwi kanye neDatha kanyekanye
Amanethiwekhi amaningi we-CDMA awavumeli ukuthunyelwa kwezwi nokudluliswa kwedatha ngesikhathi esifanayo. Yingakho ungabhekwa nge-imeyili nakwezinye izaziso ze-inthanethi uma uqeda ucingo oluvela kwinethiwekhi ye-CDMA njengoVerizon. Idatha ngokuyinhloko imise okwesikhashana ngenkathi usekholi.
Noma kunjalo, uzobona ukuthi isimo esinjalo sisebenza kahle uma usecingweni ngaphakathi kwenethiwekhi ye-wifi ngoba i-wifi, ngencazelo, ayisebenzisi inethiwekhi yenkampani yenethiwekhi.