Group Presentation Slide - Week 11

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Group Presentation Slide - Week 11

  1. 1. How Circuit-Switched Digital Networks Work ● Analog and digital signal ● What is Central office switch? ● Fiber-optic ● IDSN s1170132 Manamu Abe s1170133 Keigo Amma s1170144 Ryo Kanno s1170145 Masataka Kubota
  2. 2. What is Central office switch? Central office switch is the generic name for two switches, end office switch and tandem switch. End office switch is used for services such as call forwarding and call waiting. Tandem switch is used for long distance communication in the PSTN.
  3. 3. Analog and digital signal ● The analog signal is a signal expressed with physical quantity such as the voltage or the electric current, and the digital code is a signal expressed with numerical value.
  4. 4. ISDN ● ISDN (Integrated Services Digital Network) is digital transmission for the telephone, FAX and other data. ● ISDN consists of 3 channel. 2 channel of them are for the transmission, and the other one is for the control. ● Therefore, we can use the telephone and Internet at the same time.
  5. 5. Fiber-optic ● Fiber-optic is often called optical fiber. ● An optical fiber is a glass or plastic fiber that carries light as data. ● It can carry data for short time than electrical cables.So optical cable is used in many locations
  6. 6. REFERENCE  Your Dictionary.com http://www.yourdictionary.com/  Network dictionary http://www.networkdictionary.com/  Analog and digital signal http://www.networkworld.com/subnets/cisco/081308-ch  Wikipedia http://en.wikipedia.org/wiki/Optical_fiber

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