Inkcazo ye-GSM (iNkqubo yeSizwe yeNxibelelwano yeThafono)
I-GSM (i- gee-ess-em ) ebizwa ngokuba yi- gee-ess-em ) iyona nto ifowuni yefowuni ethandwa kakhulu, kwaye isetyenziswa kumazwe ngamazwe, ngoko mhlawumbi uye wakuva malunga nemeko yee-GSM kunye ne-GSM amanethiwekhi, ngakumbi xa kuthelekiswa ne- CDMA .
I-GSM yema ekuqaleni ye-Groupe Spécial Mobile kodwa ngoku ithetha iNkqubo yeHlabathi yeThutho.
Ngokwe-GSM Association (GSMA), emele imfuno yoshishino loxhumo lomhlaba wonke, lilinganiselwa ukuba i-80% yehlabathi isebenzisa ubuchwepheshe be-GSM xa ibeka iifowuni ezingenantambo.
Ziziphi iiNethwekhi zeGMM?
Nantsi ukuphazamiseka okukhawuleza kwezimbalwa ezimbalwa zezothutho kunye nezisebenzisa i-GSM okanye i-CDMA:
GSM:
- T-Mobile
- AT & T
- Indigo Wireless
- I-Pine Cellular
- TerreStar
UnlockedShop inoluhlu olubanzi lwee-GSM amanethiwekhi ase-US.
CDMA:
- Sprint
- Verizon Wireless
- Intombi yeselula
GSM vs CDMA
Ngeenjongo zentsuku kunye neenjongo zansuku zonke, i-GSM inikezela ngabasebenzisi abanzi abahamba phambili bezobuchwephesha bamazwe aseUnited States kwaye banako ukwenza i- cell phone ibe "yefowuni yehlabathi." Kutheni, izinto ezifana nokutshintsha iifowuni kunye nokusebenzisa idatha ngelixa ucingo luxhaswa I-GSM amanethiwekhi kodwa ayikho i-CDMA.
Abaphathi be-GSM baye bahamba nezivumelwano kunye nabanye abathwali be-GSM kwaye ngokuqhelekileyo babalalisa imimandla yasemaphandleni ngokugqithiseleyo kunokuba bathuthele abaphathi be-CDMA, kwaye kaninzi bengakhange bahlawule iindleko .
I-GSM nayo inenzuzo yekhadi leSIM elilula. Iifowuni ze-GSM zisebenzisa i-SIM khadi ukugcina ulwazi lwakho (inombolo yomnxeba) njengenombolo yakho yefowuni kunye nedatha ebonisa ukuba ngokwenene ungumbhalisi kumphathi walo.
Oku kuthetha ukuba ungafaka iSIM khadi kwi-fowuni ye-GSM ukuqhuba ngokukhawuleza ekusebenziseni kwinethiwekhi kunye nolwazi lwakho lokubhaliselwa kwangaphambili (njengenombolo yakho) ukwenza umnxeba, umyalezo, njl.
Ngeefowuni ze-CDMA, nangona kunjalo, i-SIM khadi ayigcini ulwazi olunjalo. Ubuni bakho bubophelelwe kwinethiwekhi ye-CDMA kwaye akusiyo ifowuni. Oku kuthetha ukutshintshela i-CDMA yeSIM khadi "ayisebenzisi" le fowuni ngendlela efanayo. Endaweni kunokuba udinga imvume evela kumphathiswa ngaphambi kokuba usebenzise izixhobo.
Umzekelo, ukuba ungumsebenzisi we-T-Mobile, ungasebenzisa ifowuni ye-AT & T kwi-Intanethi yeT-Mobile (okanye ngokuphambene nanjalo) ngokukhawuleza ukuba ufake ikhadi le-SIM ye-T-Mobile kwi-AT & T. Oku kuncedo kakhulu ukuba ifowuni yakho ye-GSM iphukile okanye ufuna ukuzama ifowuni yomhlobo.
Qhubeka ukhumbule, nangona kunjalo, ukuba oku kuyiyo kuphela yeefowuni ze-GSM kwi-GSM inethiwekhi. I-CDMA ayifani.
Enye into ekufuneka uyiqwalasele xa uqhathanisa i-CDMA ne-GSM kukuba zonke iinqununu ze-GSM zinika inkxaso yokwenza ifowuni ngexesha usebenzisa idatha. Oku kuthetha ukuba unokuphuma kwaye malunga nefowuni kodwa usasebenzisa imephu yakho yokuhamba okanye uphewule kwi-intanethi. Ubuchule obunjalo abuxhaswanga kwiinkcukacha ezininzi ze-CDMA.
Jonga yethu inkcazo ye-CDMA ngezinye iinkcukacha malunga nokungafani phakathi kwale migangatho.
Ulwazi olungakumbi kwi-GSM
Imvelaphi ye-GSM inokulandelwa emva kowe-1982 xa i-Groupe Spécial Mobile (GSM) yenziwe yiNgqungquthela yeePosi kunye ne-Telecommunications Administrations (CEPT) ngenjongo yokuyila iteknoloji yeselula ye-pan-European.
I-GSM ayizange iqalise ukusebenzisa i-yorhwebo ukuya ngo-1991, apho yakhiwe khona ngeTNMA .
I-GSM inikeza iinkcukacha eziqhelekileyo ezifana nekholi yefowuni, ukuxhunywa kwedatha, i-ID yomnxeba, ukuthunyelwa kweefowuni, ukulinda umnxeba, i-SMS kunye neenkomfa.
Le teknoloji yefowuni isebenza kwi-1900 MHz band e-US kunye ne-900 MHz band eYurophu nase-Asia. Idata ixinyiwe kwaye ichitshiweyo, ize ithunyelwe ngekaneli kunye neminye imilambo emibini yedatha, nganye isebenzisa isakhiwo sayo.