Communication Technology
Lecturer Ir. True Prayudi
Understanding Telecommunications
(Article 1 of Law no. 36 of 99):
Telecommunications is any transmission, emission, or reception of any information in the form of signs, signals, writings, images, sounds, and sound through the wire, optical, radio or other electromagnetic systems
Terminal Subsystem:
Instrument / telecommunication device in the form of electronic media is placed in the position of the beginning / end of a network system that serves to send / receive information
Switching subsystem:
Tool / implement telecommunications equipment that serves the telecommunications connection between the terminal on request
The transmission subsystem:
Tools / telecommunications equipment that serves as a media liaison between the information terminal
Power subsystem:
Tool / device that serves as a provider of telecommunications power source
Terminal Subsystem:
Telephone
Plane Telegraph
Facsimilie
Data terminal
Computer
Studio and Receiver Radio / Television
Cell Phones
Telephone
The phone is the meaning of the voice from a distance
Based on the way to call
Select the Automatic Telephone aircraft wheels (rotary dial) is used in automatic telephone exchange, with wheels that generates digit select
Automatic Telephone Push Button (push button dial) central automaton, with the digit
Based on the Use of Aids:
Public Telephone Box With Coin payphone, method of payment using coins
Public Telephone Cards (TUK) payment by card
Based on the freedom of mobility:
Fix Telephone Line / PSTN (Public Switching Telephone Network) fixed public telephone network / not moving
Cellular Telephone (Cell Phone)
mobile telephone networks (AMPS, GSM, PCS)
Cell Phones
Commonly called the Mobile. Sejal been introduced in Indonesia in 1979 by PT.INTI (Telecommunications Industry). Network when it was known by Mobile Telephone Connection (STB)
STB technology lasted for half a decade since the Year 1986 Technology Cell Phones into NMT-450 (Nordic Mobile Telephone) is introduced by PT. Rajasa Hazanah Mighty
In 1990, PT. Elektrindo Nusantara started to introduce a service that introduces Technology Cell Phones AMPS (Advanced Mobile Phone System). AMPS is set by the government as telecommunications (Cellular Mobile Telephone System) National.
Analog AMPS systems are widely used in North America, Australia, and Asia.While Europe uses a different cellular NMT-450 for example, NMT-900. Therefore, Europe and build a system with a system GSM (Groupe Spesiale Mobile) in 1982.Was originally designed to operate at 900 MHz
In Indonesia the GSM system was introduced in 1993 as the Global System for Mobile Communication (Global System Mobile Communications) which is also abbreviated to GSM.
GSM system uses digital technology. With the digital system is a single channel can be used by many customers, while the AMPS one channel is used only for one customer.
Currently being tested system PCS (Personal Communication System) to be applied in Indonesia. This system works at a frequency of 1800 MHz and has been used in the United States, Japan, Hongkong, Singapore, and Korea. The Government has not implemented a policy for the application of PCS systems in Indonesia today.
Plane Telegraph
Telegraph can be defined as the process of delivering the news / information in the form of images, or graphics, signs, signals over long distances through the telegraph
Judging from the device used to distribute information telegraph telegraph relations can be divided into two systems:
Morse system
This system was invented by Samuel F.B. Morse (1832).
By using aircraft Morse telegraph transmission of information is done by knocking the signs through word of morse key.
Signs are posted in the form of codes that are a combination of dots and dashes
Example:
a =. __
b = __ ...
ab =. ____ ...
Plane teleprinter
Telegraph systems using the teleprinter is a further development in the field telegraph. The principle is to type a long distance by using the keyboard.
Teleprinter system consists of:
Keyboard, the function writes the message
Transmitter, function sends message
Receiver, serves to receive messages
Printer, serves mencatak message
Control Unit, serves as a central control, such a CPU of a computer
Facsimile plane
Besides the aircraft Telegraph, we know the plane Telephoto. Telephoto means sending pictures from a distance. Telephoto plane now better known as the Aircraft Facsmile. Facsimile is basically a copy machine remotely
Data Terminal plane
The aircraft is part of Terminal Data Processing Engineering Data that is capable of transmitting digital data over communications networks. Communication that occurs frequently we call the Data Communications.
Data Terminal plane could be computers or other hardware
Studio and Receiver Radio / Television
Studio Radio / Television is a terminal that serves mnegirimkan information in the form of sound or images and sounds
Plane Radio / Television is a terminal that serves to receive the information in the form of sound or images and sounds
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