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Wednesday, May 14, 2008

CDMA Mobiles

What is CDMA?
(Code Division Multiple Access) A method for transmitting simultaneous signals over a shared portion of the spectrum. The foremost application of CDMA is the digital cellular phone technology from QUALCOMM that operates in the 800 MHz band and 1.9 GHz PCS band. CDMA phones are noted for their call quality.

CDMA Is Efficient -
CDMA requires fewer cell sites than the GSM digital cell phone systems and provides three to five times the calling capacity. Providing more than 10 times the capacity of the analog cell phone system, CDMA has become widely used in North America and is also expected to become the third-generation (3G) technology for GSM. Now In India Tata Indicom, Reliance are providing CDMA services and is very cheaper in terms of setup cost, callin
g rates are very less as compared to GSM mobile service providers.
Cdma Mobiles
CDMA transmission has been used for military purpose as these are very secure way to communication

Blackberry CDMA Mobile Phones


Samsung Cdma Mobiles in India-
Samsung MAX F679 mobile
For Specification and features

Samsung 20N GSM + CDMA Dual Sim mobile Phone
For specifications and features
Comparision CDMA and GSM
CDMA (Code Division Multiple Access) was developed by Qualcomm for military antijamming systems, which translates into highly private conversations. It spreads a low power signal across a wide frequency width, which provides for a significant increase in subscriber capacity

GSM (Global System for Mobile Communications) was originally developed in Europe and works similarly to the TDMA system: it sorts messages into time slots. The unique feature of this technology is that it allows for a short message service, up to 124 characters, while simultaneously carrying voice traffic.

Disadvantage of GSM
Europe and North America operate at different frequency bands, you can't use your North American GSM phone while traveling through Europe.

Advantage of GSM
Most GSM phones use a removable Subscriber Identity Module (SIM Cards), more commonly known as a smart card, containing a user's account information, phone book, and security parameters. By inserting the smart card from your North American GSM phone into a European GSM phone, you can successfully roam throughout most of Europe if your provider has roaming agreements with European carriers. (The reverse is also true for European users in North America.)
Furthermore, manufacturers are currently developing multi-band GSM that, once made available to the public, will allow GSM phone owners from either side of the Atlantic to roam on both continents with a single phone

GSM Mobile Phones:
1) Nokia
2) Motorola
3) Samsung
4) LG


sapna said...

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Shefali Roy said...

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Niesh said...

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free classifieds india said...

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