USB-modems ngoba CDMA ejwayelekile

Uma uthi nhlá kungase kubonakale sengathi USB-modems Bambalwa kakhulu abantu kudingeka. Nokho, lokhu kuyadukisa. Nasi isizathu. Ngempela, iningi okwakukhona manje emakethe imishini inethiwekhi ngokuxhumana nge-computer usebenzisa i-Ethernet esibonakalayo. Isizathu ukuthi banal: le ndinganiso kudinga ikhebula uxhumano ISP, okuyinto libhekene ukufinyelela ngesivinini kuya Inthanethi global. Kodwa ezihlukahlukene-USB modems bavame ukusebenzisa ukukhulumisana indlela engenantambo, okuyinto, ngeshwa, akahlukile ukusebenza efanayo. Noma kunjalo, thola abathengi yabo.

Inthanethi emoyeni

Leso sihloko ayikona ukuthola abstract kakhulu, ake sibheke-USB modems zenzelwe ukusebenza amanethiwekhi we-CDMA-opharetha. Konke okungenhla kancane kusebenza ejwayelekile ye-GSM.

Manje ethandwa kakhulu amadivayisi ahlukahlukene ephathekayo - laptops, netbooks, amaphilisi, njll Ngamanye amazwi, bonke labo kungenziwa ngokuthi mobile .. Kucacile ukuthi "ukuhamba" futhi "Inthanethi wire" - imiqondo engahambelani. Ukuze uxazulule le nkinga, opharetha abaningi baye baqala ukunikela ukufinyelela inthanethi engenawaya. Vele ngokwanele ukuthola iziphi-USB modems, ukuthenga imodeli zakho ozithandayo, bese usayine inkontileka ne wesevisi efanele. Ayikho cabling liyadingeka. Inethiwekhi yonke indawo fixed isignali eziteshini base.

Inkinga oluthandwa

Yiqiniso, khetha i-USB modems akudingeki ekubukekeni (nakuba lokhu nakho kubalulekile), futhi ikhumbula izici zayo.

Ngakho, modems CDMA ongasebenza kwelinye izindlela ezintathu: isivinini 1x ongaphakeme (kufika ku 153 Kbps); ijubane medium 3G (kufika ku 3.1 Mbps) nesivinini okusezingeni eliphezulu (kufika ku 14.7 Mbps). Ukuhambelana inakekelwa kusukela phezulu kuya phansi, ie idivayisi esekela 14 Mbps, ke ubhekana kahle nabanye nezindinganiso ezimbili. Kufanele wazi ngaphambi kokuthenga imodemu akhethwe opharetha isebenza nanoma iyiphi ejwayelekile.

Ngezinye izikhathi izitolo zinikeza ukuthenga-amplifier kwesitoreji-imodemu. Le divayisi kuyadingeka uma kwenzeka ukuthi uma uhlela ukusebenzisa ukufinyelela okungenawaya isiginali endaweni ababuthakathaka. Kanye ezifakiwe imodemu, abambe amagagasi futhi igxile nabo endaweni ka esinothi esakhelwe, kanjalo ngcono ukuxhumana kwethu. Ukusebenza kahle incike nemingcele eziningana. Ukuze ukusetshenziswa umile okunengqondo ngokwengeziwe ukuthenga imodemu ne sangaphandle antenna isixhumi.

Ngokuvamile, abakhiqizi ozama ezidonsela ukunakekela imikhiqizo yabo ngokunikeza isixazululo nge ikhono ukuxhuma khadi, okwenza imodemu ku-USB flash drive. Lokhu kwalokho cishe ayikhuphuki Kubiza, likufuna kakhulu.

Uma ukuthenga imodemu, kutuswa ukuba ukuhlole imizuzu 10-15. imodeli Akuphumelelanga lesi sikhathi isikhathi babe kushisa kakhulu.

Ukusetha i-USB imodemu

Njengoba kushiwo ngenhla, inkinga eyinhloko omakhalekhukhwini - isivinini esiphansi. Ngisho amangalelwe 14.7 Mbps lungafinyeleleki - abahlinzeki awulona ize abonisa "phambi" phambi amadijithi. Ngokwengxenye ukuthuthukisa lesi sibalo bungatholakala ngokumisa. Okokuqala, kufanele kutholakale izinga isignali - kungenzeka ukusebenzisa uhlelo Axesstell. Uma amazinga ayo ayanele (ngaphezulu «- 100dB»), kubalulekile ukuxhuma enothi lwangaphandle noma isignali amandla. Kungaleso sikhathi kuphela lapho ungakwazi ukuqhubeka ukumisa isofthiwe, ngaphandle kwalokho ngeke ulethe ukuba ngcono okukhulu. Indlela elula ukusebenza idivayisi kungenzeka ngokufaka inguqulo yakamuva ye umshayeli. Ezinye izici ezidinga ulwazi oluthile emkhakheni CDMA-imodemu, ngakho basuke kubhekwe ngokuningiliziwe izinkundla ingxoxo.