Dual band

Dual band

In mobile phones, dual band (also known as "dual-band" or "dualband") refers to functionality that allows a cellphone to support two frequency bands. Having more than one frequency in one device is useful to enable roaming between different countries that peg the allowed transmission frequency at different values or to allow a better coverage in the same country.

2G

In Europe two bands (900/1800 MHz) are used in the same country to improve coverage.

In America two bands (850/1900 MHz) are used in the same country to improve coverage.

Dual band phones are also used to enable roaming between different countries. For example, a cellphone with dual band 850/1800 MHz will work in both the United States (850 MHz) and India (1800 MHz).

3G

UMTS / HSDPA devices operate in some combination of UMTS frequency bands 800/850/900/1700/1900/2100 MHz:
*2100 (downlink) / 1900 (uplink) for Europe and Asia (usually referred simply as W-CDMA 2100)
*850 / 2100 (independently, for both the uplink and downlink) for Australia (e.g. Telstra)
*1900 / 850 (independently, for both the uplink and downlink) for America (e.g. Cingular Wireless)
*2100 (downlink) / 1700 (uplink) for America (e.g. T-Mobile)
*800 for Japan

UMTS / HSDPA / HSUPA is a further evolution.

Note that being UMTS / HSDPA / HSUPA quad band doesn't mean that phone is a GSM / GPRS / EDGE quad band. An HSUPA quad band could not be a GSM at all. However nearly all HSUPA quad band are EDGE quad band too.

A 3G Tri band or Quad band offers more coverage.

Devices

Some UMTS/HSDPA dual band are available:

850/2100
*Nokia - Nokia 6120 classic, Nokia 6500 classic, Nokia E51

900/2100:
*Nokia - Nokia 6121 classic, Nokia N96

850/1900:
*Nokia - Nokia N75, Nokia N95-3

ee also

* 3GPP
* Cellular frequencies
* GSM frequency bands
* Quad band
* Roaming
* Tri band
* UMTS frequency bands


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Look at other dictionaries:

  • dual band — /dualˈbɛnd, ingl. ˈdjuːəlˌbænd/ [loc. ingl., propr. «banda (band) doppia (dual)»] loc. agg. inv. a doppia banda …   Sinonimi e Contrari. Terza edizione

  • dual-band — adj [only before noun] a dual band ↑mobile phone is able to work in at least two different countries because it can receive two different types of signals …   Dictionary of contemporary English

  • dual-band — noun A device that is capable of operating in two frequencies. On a wireless network, dual band devices are capable of operating in both the 2.4GHz (802.11b/g) and 5GHz (802.11a/n) bands. In cellular phone technology, dual band devices typically… …   Wiktionary

  • dual band — {{hw}}{{dual band}}{{/hw}}locuz. agg. inv. ; anche locuz. sost. m. inv. Detto di telefono cellulare in grado di operare su due bande di frequenza. ETIMOLOGIA: voce ingl., propr. ‘banda (band) doppia (dual)’ …   Enciclopedia di italiano

  • Dual-band blade antenna — Contents 1 Introduction 2 Theory 2.1 Monopoles 2.1.1 Blade Antennas 2.2 Slot Antennas …   Wikipedia

  • dual band — du·al band agg.inv. ES ingl. {{wmetafile0}} TS telecom. di telefono cellulare, che è in grado di operare su due bande di frequenza {{line}} {{/line}} DATA: 1997. ETIMO: comp. di dual doppio e band 3banda …   Dizionario italiano

  • dual band — duˈal band adjective Denoting a mobile phone that is capable of operating on two frequency bands • • • Main Entry: ↑dual …   Useful english dictionary

  • Dual-Band-Handy — Du|al Band Han|dy, das [aus engl. dual = zweifach, doppelt, engl. band = (Frequenz)band u. ↑ Handy] (Fachspr.): Handy, das in zwei unterschiedlichen Frequenzbereichen verwendet werden kann. * * * Du|al Band Han|dy [dju:əl bænd...], das [aus engl …   Universal-Lexikon

  • Dual-Band-Handy — Du|al Band Han|dy [dju:əl bændhɛndi] das; s, s anglisierende Bildung zu engl. dual »doppelt, Doppel « u. (frequency)band »(Frequenz)bereich«> Handy, das in zwei Telefonnetzen mit unterschiedlichen Frequenzbereichen benutzt werden kann …   Das große Fremdwörterbuch

  • Dual-Band — Mit dem Begriff Dualband wird die Fähigkeit von Mobiltelefonen bezeichnet, auf zwei verschiedenen Frequenzbändern Verbindungen herzustellen. In Europa verwenden die Netzbetreiber zwei Frequenzbänder, 900 MHz (z. B. T Mobile und Vodafone,… …   Deutsch Wikipedia

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