Incazelo ye-GSM (I-Global System Yezokuxhumana Zamaselula)
I-GSM (ebizwa ngokuthi i- gee-ess-em ) iyinhlangano ejwayelekile kunazo zonke yefoni , futhi isetshenziswa emazweni angaphandle, ngakho-ke mhlawumbe uke wakuzwa ngakho ngomongo wezingcingo ze GSM kanye ne-GSM, ikakhulu uma kuqhathaniswa ne- CDMA .
I-GSM imele kuqala i-Groupe Spécial Mobile kodwa manje isho ukuthi i-Global System yezokuxhumana ze-Mobile.
Ngokusho kwe-GSM Association (GSMA), emele izithakazelo zomkhakha wezokuxhumana weselula emhlabeni wonke, kufinyelelwa ukuthi 80% wezwe isebenzisa ubuchwepheshe be-GSM uma ufaka izingcingo ezingenantambo.
Yiziphi izinethiwekhi eziyi-GSM?
Nansi ukuphazamiseka okusheshayo kwezimbambisi ezimbalwa zamaselula futhi okusebenzisa i-GSM noma i-CDMA:
I-GSM:
- T-Mobile
- I-AT & T
- I-Indigo Wireless
- I-Pine Cellular
- TerreStar
I-UnlockedShop inehlu olubanzi oluningi lwezingcingo ze-GSM e-US.
I-CDMA:
- Sprint
- I-Verizon engenantambo
- Virgin Mobile
I-GSM vs CDMA
Ngezinjongo eziwusizo nezinsuku zonke, i-GSM inikeza abasebenzisi amandla amaningi okuzulazula emhlabeni kunamanye ubuchwepheshe benethiwekhi yase-US futhi ingenza umakhalekhukhwini ube "ifoni yomhlaba." Ngaphezu kwalokho, izinto ezifana nokushintsha amafoni kalula nokusebenzisa idatha ngenkathi ucingo lisekelwa Amanethiwekhi we-GSM kodwa hhayi i-CDMA.
Abathwali be-GSM bahamba ngezinkontileka nabanye abathwali be-GSM futhi ngokuvamile bafaka izindawo ezihlala ezindaweni zasemaphandleni ngokugcwele kakhulu kunabanye abathintekayo be-CDMA, futhi kaningi ngaphandle kokuzulazula amacala .
I-GSM nayo inenzuzo yamaSIM khadi kalula. Amafoni we-GSM asebenzisa i-SIM khadi ukugcina imininingwane yakho (obhalisile) njengenombolo yakho yefoni kanye neminye imininingwane efakazela ukuthi empeleni ubhalisele lowo othwala.
Lokhu kusho ukuthi ungafaka iSIM khadi kunoma yiliphi ifoni ye-GSM ukuze uqhubeke usebenzise khona kwinethiwekhi yonke imininingwane yakho yokubhalisa yangaphambilini (njengenombolo yakho) ukwenza izingcingo, umbhalo, njll.
Ngamafoni e-CDMA, noma kunjalo, i-SIM khadi ayigcini imininingwane enjalo. Ubunikazi bakho buboshwe kwinethiwekhi ye-CDMA hhayi ucingo. Lokhu kusho ukususa amakhadi we-CDMA SIM "akusebenzisanga" idivayisi ngendlela efanayo. Wena kunalokho udinga ukuvunyelwa kusuka kubathwali ngaphambi kokuthi usebenze amadivayisi okushintshanisa.
Isibonelo, uma ungumsebenzisi we-T-Mobile, ungasebenzisa ifoni ye-AT & T kunethiwekhi ye-T-Mobile (noma ngokuphambene nalokho) uma nje ufaka ikhadi le-SIM le-T-Mobile kudivayisi ye-AT & T. Lokhu kuhle kakhulu uma ifoni yakho ye-GSM iphukile noma ufuna ukuzama ifoni yomngani.
Khumbula, kodwa ukuthi lokhu kuyiqiniso kumafoni we-GSM enethiwekhi ye-GSM. I-CDMA ayifani.
Okunye okumele ucabange uma uqhathanisa i-CDMA ne-GSM yilawo wonke amanethiwekhi e-GSM asekela ukwenza ucingo ngenkathi usebenzisa idatha. Lokhu kusho ukuthi ungaphandle futhi ucishe ucingo kodwa usasebenzisa imephu yakho yokuzulazula noma upheqa i-intanethi. Ukukwazi okunjalo akusekelwe kumanethiwekhi amaningi we-CDMA.
Bheka incazelo yethu ye-CDMA ngeminye imininingwane mayelana nokwahlukana phakathi kwala mazinga.
Ulwazi oluthe xaxa ku-GSM
Imvelaphi ye-GSM ingalandelwa emuva ngo-1982 lapho i-Groupe Spécial Mobile (GSM) idalwe yi-European Conference of Postal and Telecommunications Administrations (CEPT) ngenjongo yokwakha ubuchwepheshe beselula e-pan-European.
I-GSM ayizange iqale ukusetshenziselwa ezentengiselwano kuze kube ngu-1991, lapho yakhiwe khona ngobuchwepheshe be- TDMA .
I-GSM inikeza izici ezijwayelekile ezifana nokubethelwa kwekholi yefoni, ukuxhumana kwedatha, i-ID yocingo, ukuthumela ucingo, ukulinda ucingo, i-SMS, nokuxhumana.
Lolu buchwepheshe befoni yeselula lusebenza eqenjini le-1900 MHz e-US kanye ne-900 MHz band eYurophu nase-Asia. Idatha icindezelekile futhi igxiliwe, bese ithunyelwa ngomzila ngeminye imifudlana eminye yedatha, ngamunye usebenzisa isaga sayo siqu.