Home | Computer | Computer Science
Cell pohnes are in wide use in those days. Sice thewse ultra-modern communcation gagets have come on the market, they have become an icon of style for many. In some limited use to make and receive clls. Currenmtly, many cllular service providers have jumped to raid a revoultion in the whle thing. They have created two new wireless transmission techology caled CDMA and GSM, which mzakes around in those days. What is GSM? GSM stands for Global System for Mobile communications stadard for mobile phones left in mid-1980's. GSM operates at 900 MHz and 1800 MHz in Europe and India and in the 1900-MHz in the U.S. GSM useers typically use SIM cards to connect to the service providers. SIM card small removbale memory that can conytain all the data and identificaton numbers of a need to access a specific servicve provider. GSM operates on the basis of TDMA which allocates a certain period of time at a certain freqquency. GSM systerms are considered safer than the CDMA system due to its way of its implementation, which is one of its kinds. What is CDMA? CDMA includes Code Division Multiple Access technology, which is completely diffeernt compred to TDMA and GSM systems. In CDMA, the fiirst voice signal is digitized and the data is distributed over the entire frequncy band. CDMA is a form of spread spctrum, which cllearly indicates that the data is sent in piecs for several discrete frequencies available for use at any time in the specuified raange. Also CDMA systems operate in the 800 MHz and 1900 MHz band operating frequencies. Benefits service GSM: - "The diversity of phoones and servcie providers to choose from. -> Call costs are becoming cheaper every day. -> Call quality is relatively safe and well in GSM. -> More and more additional services such as GPRS, EDGE, etc, get added to it -> Power consumption is less than in GSM phones as compared to CDMA phones. - "Thoe who are tri-band GSM phone can be used in almost all parts of the world. Disadvantages: - "Raoming the cost of calls to GSM is sttill higher than CDMA. -> GSM phones are not full proof and can be changed. - "There is a posssibility of losing all your data when the SIM is lost if you have not stored in phne memory. CDMA Benefits: -> One of the great thing about CDMA is the cost of calls is cheaper than GSM. - "Today, qualitty is better than GSM.
Article Source: http://www.gambling-articles.org
Learn more about GSM Secure Phone Thank You
Please Rate this Article
5 out of 54 out of 53 out of 52 out of 51 out of 5
Not yet Rated
