Computer

Computers are used daily by thousands of people all over the world.

They are machines that manipulates data according to a set of instructions. The first electrical computer were developed in the mid 20th century,they were the size of a large room using hundreds of units of power. Modern computers are now based on intergrrated circuits. Computers have the ability to store many different programmes. When a person uses a computer, they are telling it what to do with their actions.

ADSL modem

An ADSL modem is a device which is used to connect a computer or a router to a DSL phone line, to use ADSL services.

The modem uses high frequency tones for transmission. Most modems are external to the computer & wired to the computers Ethernet port or the usb port. ADSL modems are intended for particular protocols & somtimes dont work on other lines. ADSL modems vary in data speed.

Voice over internet protocol - VoIP

Voice over internet protocol is a general term for a family for a family of transmission technologies for delivery of voice communications over IP networks such as the internet or other packet switched networks. Other things used by VoIP are: IP telephony, Internet telephony, Voice over broadband, Broadband telephony & broadband phone.

Internet telephony refers to communication which are transported through interent.

VoIP use session control protocols to control the set up and tear down of calls also allowing transmission over an IP network.

Broadband

Broadband can refer to broadband networks or broadband internet. It is a way of moving information accross a network and is used for high speed connections. It is much faster then dial up connecting.

Asymmetric digital subscriber line - ADSL

DSL is a family of technologies that provides digital data transmissions over the wire of a local telephone network. ADSL is the most popular version of consumer ready DSL. This can be used at the same time on the same telephone line. DSL works by dividing the frequencies used in a single phone line into two primary bands. The ISP data uses the high frequency band wheras the voice utilizes the lower fequency band. Users install a DSL filter on each phone outlet, which filters out the high frequencies from the phone line so the phone sends or recieves only the lower frequencies. ADSL is useful to me because i use the internet.

Bluetooth.

Bluetooth is an open wireless protocol for exchanging data over short distances using radio waves from fixed and mobile devices. It was originally concieved as a wireless alternative to RS-232 data cables. it can connect several devices overcoming problems of synchronizing. Bluetooth is a standard and a communications protocol primarily designed for lower power consumption with a short range. Bluetooth uses a radio technology called frequency hopping spread spectrum.

general packet radio service - GPRS.

GPRS is a packet oreiented mobile data service available to the users of 2g. GPRS data transfer is charged per megabyte.
It was developed as a GSM response to the earlier CDPD and i-mode packet switched cellular technologies.
GPRS is commonly used in sat navs.