Sm2 Network Connections
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The document discusses different types of network connections and factors that influence efficiency. It covers: 1. Types of access such as direct access through a LAN or remote access via phone line, cable, or wireless. 2. Transmission media including twisted-pair cables, coaxial cables, fiber-optic cables, and wireless options like Wi-Fi, infrared, and Bluetooth. Fiber-optic cables provide the fastest transmission speeds. 3. Types of connections including phone lines with modems, broadband connections through DSL or cable modems, and wireless or satellite options. Bandwidth determines data transfer rates.
Sm2 Network Connections
- 1. Network Connections Textbook Chapter 8 265 to 270
- 2. Efficiency in networks depends on: Type of access Transmission Media Type of connection
- 3. 1. Type of Access Direct access : A dedicated, direct connection through a LAN Remote access : Network access via phone line, TV cable system or wireless link.
- 4. What type of access to the prepa TEC server, does your laptop have when being connected at school? What type of access to the prepa TEC server, does your laptop have when being connected at home?
- 5. 2. Transmission Media Media refers to the means used to link a network’s nodes together. Twisted-pair cables. Coaxial cables. Fiber-optic cables. Wireless media (Wi-Fi, infrared, bluetooth)
- 6. a) Twisted-pair cables They normally consist of four pairs of wires. Each pair has two wires separately insulated in plastic and then twisted around each other. Nothing shields this type of wire from outside interference. New cables support up to 1 Gbps (gigabit per second)
- 7. b) Coaxial cables It consists of a rigid copper wire, surrounded by insulating material. It supports transmission speeds up to 10 Mbps (megabits per second). It is more expensive than twisted-pair cables It is becoming less popular as twisted-pair technology improves.
- 8. c) Fiber-optic cables It is a thin strand of glass that transmits light rather than electric current. Its transmission speed approaches 100Gbps. It is immune to electromagnetic interference. It is extremely fast, it can carry enormous number of messages simultaneously and it is very secure.
- 9. d) Wireless Media: Wi-Fi The most popular is known as Wi-Fi (Wireless Fidelity) It uses radio signals that travel through air from a base station up to 46 meters away (150 feet). It is not as fast as a cable connection.
- 10. e) Wireless Media: Infrared It sends and receives digital information over short distances. It is not widely used because of line-of-sight limitations (it cannot pass through walls). Share of data is “beamed” through infrared links .
- 11. f) Wireless Media: Bluetooth Overcomes differences between mobile phones, handheld devices and computers. It makes possible communication between all those devices regardless their operating system.
- 12. Which transmission media is the fastest? Which transmission media do you have at home? Which transmission media does the highschool have?
- 13. 3. Type of connections Connection to Internet could be through phone line and a modem through broadband connections through fiber-optic connections.
- 14. Bandwidth In all cases, the bandwidth determines the data transfer rate – the quantity of data that can be transmitted through a communication medium in a given amount of time. Large bandwidths are measured in kilobits (thousands of bits) or megabits (millions of bits) per second.
- 15. Broadband connections Connection with much greater bandwidth than standard modems are: Digital Subscriber Line (DSL) uses standard phone lines and is provided by phone companies in many areas. Cable modems provide fast network connections through cable television networks in many areas. High-speed wireless connections can connect computers to networks using radio waves rather than wires. Satellite dishes can deliver fast computer network connections as well as television programs.