If you wish to communicate with telephone to your friend, of course you need appliance which is able to connect your telephone to your friends telephone. If only you wish to see telecast of America or Europe, you need applianceto catch the broadcast. Appliance able to connect a communication means to referred by other communication means of network. There are some kinds of use networks in the field of telecommunications, that is as follows.

a. Wireless

Wireless is usually conceived of communications network of nir cable, that is communicates network using radiowave which is functioning selected frequency as transmitter, lasing and receiver of containing wave of data. Wireless is often used by computer to each other to communicate to other computer.

b. Modem

Modem is an abbreviation of modulator demodulator. This modem transfer is data from the computer data form to be data in the form of elektromagnetic. There are some various types of modem circulating in marketing wiyh speed of immeasurable that is as follows 14400 bps, 28800 bps, 56000 bps , 128000 bps, 4 Mbps, and 10 of Mbps Elections of this modem very hinge with requirement of you. For the reason, choose modem with speed of high transfer, for example 10 Mbps mean in one second can transfer upto 10 Mega character.

c. Satellite

Satelite is functioning the communications network as transmitter, receiver, and lasing waving. This communications systems use elektromagnetic wave as consignor of his data. Usually satelliteis placedby space. Almost all telecommunications use satelite as an important core network.

d. Wireline

Wireline is a network which looks like a wireless. The difference, wireless is network wihout cable, while wireline is network using cable. The possibility you have telephone at home which produced by PT. Telkom. That one of those examples use of wireline. Telephone using cable (wireline), can be also used to access internet, thatis by connecting cable phone in computer port. However, there is also using network of wireless network or without cable, like Telkom Flexi.

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