Dab tsi yog bandwidth ntawm GSM?
Dab tsi yog bandwidth ntawm GSM?

Video: Dab tsi yog bandwidth ntawm GSM?

Video: Dab tsi yog bandwidth ntawm GSM?
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25 MHz

Ib yam li ntawd, tib neeg nug, GSM zaus bands yog dab tsi?

Hauv North America, GSM ua haujlwm ntawm thawj kev sib txuas lus mobile bands 850 MHz thiab 1900 MHz. Ntxiv mus GSM -850 kuj qee zaum hu ua GSM -800 vim qhov no zaus Qhov ntau tau hu ua "800 MHz band " (rau kev ua kom yooj yim) thaum nws thawj zaug faib rau AMPS hauv Tebchaws Meskas hauv xyoo 1983.

Tsis tas li ntawd, qhov txawv ntawm GSM 900 thiab 1800 yog dab tsi? Ob hom xov tooj ntawm tes hluav taws xob siv hluav taws xob txawv cab kuj zaus thiab muab txawv zaus spectra, tab sis lawv feem ntau kuj sib txawv ntawm kev siv, xws li GSM 900 Nws MHz antennas ua haujlwm ntawm kwv yees li ob npaug ntawm lub zog tso zis ntau dua li DCS sib raug 1800 MHz cov.

Hais txog qhov no, quadband GSM yog dab tsi?

Quad - band - txhais. Hais txog lub xov tooj ntawm tes uas txhawb nqa plaub qhov loj GSM zaus bands (850/900/1800/1900 MHz), ua rau nws sib xws nrog txhua qhov loj GSM networks hauv ntiaj teb no. 850/1900 MHz bands Feem ntau yog siv nyob rau hauv Teb Chaws Asmeskas, thaum lub 900/1800 MHz sawv daws yuav muaj nyob rau hauv feem ntau lwm lub teb chaws thoob ntiaj teb.

Dab tsi GSM bands siv hauv Tebchaws Europe?

Lub teb chaws ntawm Teb chaws Europe siv dual-band zaus ntawm 900 txog 1800 thaum Asmeskas feem ntau siv 850 txog 1900. Thaum yuav khoom rau lub xauv GSM xov tooj, koj yuav xav tau ib tug tri-band 900/1800/1900 (los yog 850/1800/1900) los yog quad-band 850-900-1800-1900 yog tias koj xav siv nws hauv Teb Chaws Asmeskas thiab hauv Teb chaws Europe.

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