Thursday, March 15, 2012

evolution of cell phones

 File:Recreational Walkie Talkies.jpg
we  want to know about the past ,about cell phone , No one knows how cell was at  olden time .cell phone was developed at the year 1940 by Donald L. Hings, radio engineer Alfred J. Gross, and engineering teams at Motorola.BUT WHAT PURPOSE CELL PHONE COME
Because it was developed due to major reason are  world  war 2 communication was  needed more so they introduce walkie talkie
                                                  FIRST GENERATION

1 Oct 1973

The modern handheld cell phone era began in 1973 when Motorola invented the first cellular portable telephone to be commercialised, known as Motorola DynaTAC 8000X. Martin Cooper, a Motorola researcher and executive is considered to be the inventor of this mobile phone for use in a non-vehicle setting..

Second Generation: Digital Networks
1 Oct 1990
File:Mobile phone PHS Japan 1997-2003.jpg

In the 1990s, the 'second generation' mobile phone systems emerged, primarily using the GSM standard. These 2G phone systems differed from the previous generation in their use of digital transmission instead of analog transmission, and also by the introduction of advanced and fast phone-to-network signaling.The second generation introduced a new variant of communication called SMS or text messaging.

3rd Generation: High Speed Data Networks
1 Oct 2001

As the use of 2G phones became more widespread and people began to utilize mobile phones in their daily lives, it became clear that demand for data services (such as access to the internet) was growing. Furthermore, experience from fixed broadband services showed there would also be an ever increasing demand for greater data speeds.  The main technological difference that distinguishes 3G technology from the 2G is the use of packet switching rather than circuit switching for data transmission


Post a Comment