Knowing Your Cell Phone

Knowing Your Cell Phone
No one doubts that cell phone (cellular) is​ one of​ the​ most used consumer electronics worldwide .​
But have you ever asked yourself how does a​ cell phone work? What is​ a​ cell phone?
The amazing fact about a​ cell phone (cellular) is​ that it​ is​ a​ radio - a​ very special one .​
The gurus in​ the​ line are Bell (1876), Tesla (1880) followed by Marconi and​ Bose (late 19th century) .​
It is​ known that the​ concept of​ cell phone was produced by Bell Laboratories with the​ permission of​ FCC (Federal Communication Commission), and​ had everything to​ do with broadcasting and​ sending a​ radio message out over the​ airwaves.
In cell phone technology cells divide the​ city, allowing for​ the​ facility to​ be frequently reused throughout the​ city .​
Millions can simultaneously avail of​ it.
In devices that are half-duplex (walkie-talkies and​ CB radios) two communicators use a​ single frequency .​
This means that at​ a​ single point of​ time only one can talk .​
On the​ other hand a​ cell phone (cellular) being a​ full duplex tool has two frequencies: one for​ talking and​ the​ other for​ listening .​
Thus a​ real-life conversation can take place .​
Cell phones (cellular) glide through 1,664 channels whereas the​ walkie-talkie group has to​ be content with only 40 .​
The walkie-talkie and​ the​ CB radio respectively reaches out to​ 1 mile and​ 5 miles but the​ cell phones, because of​ their ability to​ switch from cell to​ cell can cover incredible distances, even while driving at​ top speed .​
Each cell is​ approximately 10 square miles.
The cells are usually depicted as​ hexagons .​
The unique frequency tiers avoid all possibilities of​ cross connections .​
Generally a​ carrier of​ cell phone can avail of​ 832 radio frequencies in​ a​ city .​
Each cell phone (cellular) uses 395 voice channels (per carrier), that is​ 56 voice channels per cell .​
It means 56 persons can simultaneously say hello on the​ phone .​
In digital transmission technology the​ number of​ channels increases even further .​
For each cell phone 168 channels is​ available.
The distinctiveness about cell phones (cellular) is​ their low-power transmitters .​
Most use 2 strengths: 0.6 watts and​ 0.3 watts .​
In comparison it​ is​ 4 watts for​ CB radios .​
The advantage of​ this is​ that it​ can be frequently reused consuming less power .​
Cell phones are battery operated .​
The lower the​ power the​ smaller the​ battery .​
This makes the​ set handy and​ light.
For cellular technology a​ city requires a​ good number of​ base stations .​
This can run into some hundreds of​ towers .​
But because of​ the​ huge number of​ users costs per head remain very low .​
Each carrier has one center called MTSO or​ Mobile Telephone Switching Office .​
Its work is​ to​ see to​ all the​ connections.
Cell phones (cellular) each have codes, which enable identification of​ the​ phone, its user and​ its server .​
When someone tries to​ reach a​ phone the​ first thing is​ to​ locate the​ SID (system identification code) on the​ control channel, that is​ find out if​ the​ phone is​ within range or​ not .​
a​ message relays no-service when it​ is​ out of​ range .​
But when the​ SID is​ received then the​ next step is​ to​ find out whether the​ call is​ within its own home zone or​ not .​
The phone also tracks the​ location of​ the​ phone called on a​ database .​
Thus the​ MTSO knows the​ cell of​ the​ called number and​ caller .​
Communication is​ transmitted through the​ control channel and​ it​ is​ this link that activates the​ phone being called and​ calling.
These are the​ facts of​ a​ cell phone (cellular) as​ explained for​ a​ layman .​
It is​ always advisable to​ know at​ least the​ basics of​ a​ cell phone since it​ has become an​ integral part of​ our life.
Knowing Your Cell Phone Knowing Your Cell Phone Reviewed by Henda Yesti on February 01, 2018 Rating: 5

No comments:

Powered by Blogger.