Satellites
How does a satellite communication system work?
It consists of groups of satellites that are located in the earth’s atmosphere and provide lots of coverage of connection. They have a downside, though; they are very likely to cause connection problems.
How will the next generation of cellphones be called?
The next generation will be called 4G, or fourth generation.
What are the differents types of authonomy?
The first type of authonomy is:
Authonomy in wait→ Time that the phone can stay connected without using.
Authonomy in converse→ Time that the mobile can stay connected until the battery is over.
What does GPRS stand for?
The acronyms of GPRS means general packet radio service and it consists in a implanted system over the infrastructure of the GSM that shares the frequencies of the GSM network and improves mobile access to data networks.
What’s a mobile phone?
It’s a means of communication that let two people comunicate even if they are apart.
What does 3G mean?
It means 3rd generation. It refers to the mobile phones that are capable of transmitting voice (as voice phone calls) and image (video conferences), email and many more.
What is the function of the microphone?
It allows sending sounds and also has a headset to reproduce the voice messages.
What’s the function of the BSS and explain what does it include?
The BSS manages the mobile communication. The BSS includes the BTS and the BSC, the BTS it’s the transmission team and the BSC it’s the management team.
What are the elements of fix telephones?
Microphone, headphone and keyboard.
What are the elements of fix telephones?
Microphone, headphone and keyboard.
How are 3G mobile phones able to offer so many different services?
Because of the UMTS service the 3G devices have, which makes them connect way faster at speeds of up to 21Mbit/s.
what are the different types of key-passwords?
Are three types:
Alphanumeric→ its function is to write numbers and text.
Of navigation→ its function is to configurate the telephone and acces to old of the functions.
Of connection-->Its function is to pick up, hang up, and take off the telephone.
What are the different types of accessories of the mobile phones?
Mobile phones have a lot of possible accessories for example the covers,chargers for the car, systems of free hands, etc
How many advantages does the GPRS have and which are they?
The GPRS have four advantages. They are: you can connect to networks from a mobile without access account, to make and receive calls during a transmission of data, the transmission of data faster than in the GSM and you pay for the amount of information.
Name some secondary functions of the fix telephones
Memory, fax, free hands and mailbox.
What are some examples of satellite communication systems?
Some examples are: The Iridium system, the GPS system, or the Globalstar system.
What are the elements of a mobile phone?
Circuit, batery, SIM target, display and keyboard.
What is the GSM?
The GSM is the mobile phone system used nowadays, it’s formed by the NSS and the BSS.
Explain what does the NSS manage and write the components.
The NSS manages all the communications between the users of the GSM and the users of other nets. The components are the MSC (mobile switching center), the GIWU, the HLR (home location register) and the VLR (visitor location register).
What’s the function of each one?
Memory: You can save your mostly used numbers
Fax: you can send and receive documents
Free hands: You can conversate without having the phone in your hands
Mailbox: You can leave or receive messages
In what position can LEO systems be located?
They can be located at less than 3 000km apart from the Earth’s surface.
What characteristics have to be taken into account when we go to buy a mobile phone?
We have to have into account the ergonomy(the comodity) and the autonomy(time of the batery) of the mobile phone.
What does de UMTS offer?
The UMTS offer videoconferences, e-mail, localization of people or vehicles, leisure services, electronic commerce and remote control.
What two kind of systems do exsist in mobile communications?
Portable radio systems and cellular telephony systems
Which telephony system is private?
The celLular telephony systems.