how does a telephone network works?

Question

how a telephone networks works and mobile phone network

Answer 1

The public switched telephone network (PSTN) is the network of the world's public circuit-switched telephone networks, in much the same way that the Internet is the network of the world's public IP-based packet-switched networks. Originally a network of fixed-line analog telephone systems, the PSTN is now almost entirely digital, and now includes mobile as well as fixed telephones.

The PSTN is largely governed by technical standards created by the ITU-T, and uses E.163/E.164 addresses (known more commonly as telephone numbers) for addressing.
The PSTN was the earliest example of traffic engineering to deliver Quality of Service (QoS) guarantees. A.K. Erlang (1878–1929) is credited with establishing the mathematical foundations of methods required to determine the amount and configuration of equipment and personnel required to deliver a specific level of service.

In the 1970s the telecommunications industry conceived that digital services would follow much the same pattern as voice services, and conceived a vision of end-to-end circuit switched services, known as the Broadband Integrated Services Digital Network (B-ISDN). The B-ISDN vision has been overtaken by the disruptive technology of the Internet.

Only the very oldest parts of the telephone network still use analogue technology for anything other than the last mile loop to the end user, and in recent years digital services have been increasingly rolled out to end users using services such as DSL, ISDN and Cable modem systems.

Many observers believe that the long term future of the PSTN is to be just one application of the Internet - however, the Internet has some way to go before this transition can be made. The QoS guarantee is one aspect that needs to be improved on in the Voice over IP (VoIP) technology.

There are a number of large private telephone networks which are not linked to the PSTN, usually for military purposes. There are also private networks run by large companies which are linked to the PSTN only through limited gateways, like a large private branch exchange (PBX) .

Answer 2

How Does Telephone Network Work

Answer 3

1

Answer 4

2

Answer 5

The telephone or phone is a telecommunications device which is used to transmit and receive sound (most commonly voice and speech) across distance. Most telephones operate through transmission of electric signals over a complex telephone network which allows almost any phone user to communicate with almost any other.:

Answer 6

If there is a good size office then go and request them to show you the system a library near by may have a small system, then think of that system with lots of phone rather then say 5 or six phones.

Some museums may have old systems that you can look at.

Most modern systems are automated using computers instead of human, but basic system is the same.

Two phone connected by the wires, micro-phone for mouth piece and speaker for ear piece, on each phone.

If you add third phone and you need an exchange board or device to switch the wires to connect the phones only two phones, unless you are making a conference call.

Mobile phone network is the same way but radio communication devices are used, what use to take whole building to install the system is now in the palm of your hand or even smaller.

Answer 7

see who answer the best & short.

Answer 8

http://www.howstuffworks.com/telephone.htm





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