Week 23 and 24 Module
The Objectives of the lesson will be as follows:
1) Explain how cellular phones make and receive calls (Weixel, n.d.).
2) Identify the advantages of cellphones to subscribers (Wexiel, n.d.).
3) Compare and contrast local and long distance cell phone calls (Weixel, n.d.).
4) Identify advantages of computer telephony integration (Weixiel, n.d).
5) Identify competitors for business in the telecommunications market (Wexiel, n.d).
The first cellphone came out in 1973 and changed the way that people could communicate. Cellphones gave people the opportunity to be away from a telephone land line and still communicate with people. Even though cell phones when they first came out were very basic and primitive by today's standards, they were revolutionary.
Over the decades, the creation of new technologies has allowed the cellphone to evolve into what they are today. Cell phones today have built in tools that allow them to be music players, personal computers, cameras, and camcorders. It is hard to believe that just 20 years ago cellphones could only display two colors. Over time, cell phones screens began to resemble those of television sets capable of streaming video and taking high resolution pictures.
So, how do cell phones work? When a person makes a call, the person's voice is converted into electrical signals of 0's and 1's . The electrical signals travel through the cell phone's antenna. This is where the signals are converted into electromagnetic waves. These electromagnetic waves are then sent to the nearest cellular tower. The cellular tower then passes these electromagnetic waves to a Mobile Telephone Switching Office. The (MTSO) has a database sim cards tied to a person's phone number and their location. The Mobile Telephone Switching Office then routes the call to its destination using the appropriate towers.
When someone makes a call to a landline using a cell phone, the call gets sent to the nearest tower. Once there, the call is transferred to the nearest Mobile Telephone Switching Office, which is also connected to the Public Switch Telephone Network. The Public Switch Telephone Network is a network of telephone lines that stretch throughout the country. It is through these telephone lines that the call reaches its destination.
" Cellphone systems are divided into cells" (Weixel, 2017). Each cell covers a specific geographical location. When a person goes outside of their geographical area, a new tower or cell picks up on their signal. This ensures that that the signal always remains strong. Cellphone calls, as previously mentioned travel from tower to tower until they reach their destination.
References: Weixel, S. (2017). Principles of Information Technology: Preparing for IC³ certification. Pearson.
When you speak into your cellphone, your voice converted into electrical impulses of 's and 1's.
These electrical impulses travel to the attenna, where they are converted into electromagnetic waves
The electromagnetic waves travel to the nearest cell tower. Once there, they travel to the nearest Mobile Telephone Switching Office. The (MTSO) is has a database of sim cards, along with the customers names and their locations. The (MTSO) then routes the call to its destination by using the appropriate towers.
The Public Telephone Network Switch is a vast network of telephone lines that stretch along the entire United States. Other countries have similar networks
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