1. Chapter 26 Communication Systems

2. Objectives After reading the chapter and reviewing the materials presented the students will be able to: Identify common communication systems Identify telephone and television system Summarize the computing process used in computer systems Outline communication wiring installation

3. Introduction Communication systems are designed to spread information. The products of communication technology include print, audio, digital, and visual messages. Some communication systems use a wiring network. This network is installed in much the same way as electrical power wiring.

4. Types of Communication Systems Telephone, television, computer, and intercom networks help us communicate with the world and gather information. Monitoring systems use one way communication to keep watch over buildings, machines, or processes. Surveillance systems record video images of an area such as a parking lot or door entrance. Exchange systems use two way communication to transfer information. Telephones and computers are familiar types of exchange systems.

5. Telephone Systems Telephone systems are a communication system that provides primarily two way voice and data communication. Fax machines are telephonic devices that send and receive printed images. Modems are interface devices between computers and the telephone systems. Modems make it possible to connect two computers to the internet using a telephone network. A drop is a telephone cable that connects a building to the local telephone network. A terminal block is the location in a building where all telephone wiring is connected to the building.

6. Television Systems Television systems transmit both audio and video signals to viewers through broadcast, cable, satellite, or closed circuit equipment. Broadcast signals are transmitted through airwaves to antennas that receive the signal. Cable television uses cables to transmit programming to subscribers. Monitor is any electronic device that converts a video signal back to an image with sound.

7. Computer Systems The central processing unit (CPU) is the part of a computer that processes information. Programs or software are instructions that tell the CPU what to do and how to do it. An intercom system is a communication system used for voice and sometimes visual, communication within a structure.

8. Installing Communication Wiring Installation of communication wiring is similar to installation of electrical power wiring. The major difference is that the wires are installed during the rough in process and are different from those used in electrical wiring. Telephone and television wiring use separate networks of cables. Television and computer network wiring require shielded cable. All cable should be installed before insulation and wall covering materials are installed.

9. Summary Monitoring systems use one way communication to keep watch over buildings, machines, or processes. Exchange systems use two way communication to transfer information. Telephones and computers are familiar types of exchange systems. Telephone systems are a communication system that provides primarily two way voice and data communication. Fax machines are telephonic devices that send and receive printed images. Modems are interface devices between computers and the telephone systems. Modems make it possible to connect two computers to the internet using a telephone network. A drop is a telephone cable that connects a building to the local telephone network. Television systems transmit both audio and video signals to viewers through broadcast, cable, satellite, or closed circuit equipment. The central processing unit (CPU) is the part of a computer that processes information. Programs or software are instructions that tell the CPU what to do and how to do it.

10. Home Work 1. What are exchange systems? Give examples. 2. What are modems? What do they allow us to do?