What protocol do cell towers use?
Sprint, Verizon and many smaller carriers use CDMA – a protocol developed by Qualcomm, and used primarily for newer cell phone networks in the Americas and East Asia (Korea, Japan, etc). Cingular and T-Mobile use GSM – which began in Europe and is the most popular protocol worldwide.
What do cell phones use to communicate?
Cell phones use radio waves to communicate. Radio waves carry the information and travel in air at the speed of light. Cell phones transmit radio waves in all directions. The waves can be absorbed and reflected by surrounding objects before they reach the nearest cell tower.
What type of waves do cellular phones send to cell towers?
Base stations are usually from 50 to 200 feet high. Cell phones communicate with nearby cell towers mainly through RF waves, a form of energy in the electromagnetic spectrum between FM radio waves and microwaves. Like FM radio waves, microwaves, visible light, and heat, they are forms of non-ionizing radiation.
What is GSM protocol?
The Global System for Mobile Communications (GSM) is a standard developed by the European Telecommunications Standards Institute (ETSI) to describe the protocols for second-generation (2G) digital cellular networks used by mobile devices such as mobile phones and tablets.
How does a CDMA phone work?
CDMA uses a “spread-spectrum” technique whereby electromagnetic energy is spread to allow for a signal with a wider bandwidth. This approach allows several people on different cell phones to be “multiplexed” over the same channel to share a bandwidth of frequencies.
What is telephone communication?
the transmission of speech over a distance either by electric signals propagated along conductors or by radio signals; a type of telecommunication. Telephone communication permits conversations to be carried on between people (subscribers) separated by almost any distance.
Which wave frequency is used for cell phone communications?
Cellular phone signals are transmitted on two bands, one between 800 to 900 megahertz and the other between 1.8 gigahertz to 1.95 GHz. Signals from a cellular phone transmit to a base-station, which relays it to the next station or other receivers on its network.