Data communications, the fastest growing field of telecommunication, is the process of transmitting data in digital form by wire or radio.
The transmission line used can be a normal or a specially purchased telephone line called a leased, or private, line.
Each telecommunications device uses hardware, which connects a device to the transmission line; and software, which makes it possible for a device to transmit information through the line.
A cable interface, as the name indicates, connects a device to a cable. It converts the transmitted signals from the form required by the device to the form required by the cable.
File-transfer software is used to transmit a data file from one device to another. Network software allows devices in a computer network to transmit information to one another.
Questions
1.What are the transmission media used in telecommunication?
They are the telephone, radio, television, microwave and satellite.
2.State the difference between hardware and software?
Hardware
computing) the machinery and electronic parts of a computer system or are parts that connect a device to the transmission line while software are programs that make it possible for a device to transmit through the line.
3.What are modems used for?
Modem are used to convert digital signals to and from the modulated form required by the telephone line to the demodulated form that the device itself requires.
OR the modem used for transmit data through a telephone line at various speeds, which are measure in bits per second (bps) or signals per second (baud).
4.Translate the first paragraph into Arabic.
Telecommunications, the transmission of words, sounds, images, or data in the form of electronic or electromagnetic signals or impulses. Transmission media include the telephone (using wire or optical cable), radio, television, microwave, and satellite. Data communication, the fastest growing field of telecommunication, is the process of transmitting data in digital form by wire or radio.
الاتصال عن بعد هو نقل كلمات مكتوبة وأصوات وصوراً وبيانات على شكل إشارات أو نبضات الكترونية أو كهرومغناطيسية. وتتضمن وسائط الإرسال الهاتف (سواء أكان يستخدم السلك أو الكبل البصري) والمذياع والتلفاز والميكرويف وأجهزة الاستقبال الفضائية. ومن أسرع مجالات الاتصال عن بعد تقدماً هو تبادل البيانات ، وهو عبارة عن عملية ترسل فيها البيانات بشكل رقمي سلكياً أو عبر موجات الراديو.