Please discontinue use of cell phone and turn off ringer. Chapter 5. Telecom, Wireless & Networks. Fundamentals Media, Devices, and Software Wireless Telecommunications Networks and Distributed Computing. Key Terms. Telecommunications Networking media Analog signal. Digital signal
Media, Devices, and Software
Networks and Distributed Computing
(cables or air)
Sender and Receiver must “speak” the same language.
Analog Signal: transmit sound using continuously varying levels of voltage.
Used for traditional phone lines, twisted pairs of wires in plastic sheathing.
Used for home cable TV, thick copper core wire – faster than twisted pair.
Thin strands of glass are used to send light beams – highest bandwidth cable, most expensive.
Electromagnetic waves transmitted through the air at various frequencies.
Deep space radio communications (2.29-2.3 GHz)
Wi-fi Wireless Networks (2.4 GHz)
Global Positioning System 1.23 and 1.58 GHz
Air traffic Control (960-1,215 MHz)
900-MHz cordless phones
Cell Phones (824-849 MHz)
TV CH 7-13 (174-220 MHz)
FM Radio (88-108 MHz)
TV CH 2-6 (54-88 MHz)
Cordless Phones (40-50 MHz)
CB Radio (26.96-27.41 MHz)
AM Radio (535-1700 kHz)
The Radio Spectrum
1) Does 88.9 FM use an analog or digital signal?
2) Does a cell phone use an analog or digital signal?
3)Which type of cable has the highest bandwidth?
Seattle’s Space Needle To Become WiMax Antenna
4)What technology is able to display your current location on a map?
5)What is today’s most popular wireless network standard?
The original PAN was designed by Thomas Zimmerman and allowed users to pass digital electronic information through touch, by transferring information from one person’s device to another’s, running a subtle current through the body.Network Types
Exchange emails through handshakeTWO Japanese telecoms giants have developed technology that turns the human body into a broadband-paced link that allows e-mail addresses to be exchanged through a simple handshake, a report said Monday.The technology, developed by Nippon Telegraph and Telephone Corp. and its subsidiary NTT DoCoMo Inc., uses the body's conductivity and adds the smarts of a personal digital assistant (PDA), the Nihon Keizai Shimbun said.
A device attached to a PDA can send and receive weak electrical signals through people, with human bodies as communications circuits, the paper said, citing sources close to the companies.
Apparel and handbags have their own conductivity, allowing an electrical connection to a PDA that can remain in one's pocket, the paper said.
In this way, people can exchange e-mail addresses, names and phone numbers while shaking hands, with the data automatically written into both their PDAs, the paper said.
The companies have confirmed in an experiment that data can be transmitted at 10 megabits per second, comparable to the speed of a broadband Internet connection, it said.
The technology could allow data communications through door knobs, switches, desks and chairs, the paper said. It could pave the way to one day being able to pass through railway ticket gates or entering secure buildings with a simple touch. It could also get a computer to start up with the proper settings as soon as the user sat down, the paper said.
See also “Microsoft patents body power”
To Cable Co.
Cable ModemInstalling Home Wi-fi
Wireless home media: http://www.apple.com/airportexpress