1. Lecture Exam Monday 5:30 – 6:30 bring a blue bubble sheet lab sections 10, 11, 12 take test in Classroom Building 302 lab sections 13, 14, 15 take test in Classroom Building 304 lab sections 16, 17 take test in Classroom Building 306 lab sections 19, 20 take test in Classroom Building 308

2. Telecommunications Communications over a distance.

3. The Telecommunications Industry Major Players –phone companies –cable-TV and Satellite Companies –content providers –other players software companies communications hardware companies

4. The Telecommunications Industry (cont.) Government Legislation –Carterfone Decision –Telecommunications Act of 1996

5. Communications Media Provides the means of transmitting a signal between two hardware devices

6. Types of Communications Media Wire –Twisted Pair Cable –Coaxial Cable –Fiber Optic Cable Wireless –Microwave Transmission Terrestrial and Satellite Transmission –Cellular details follow

7. Twisted Pair Cable RJ 45 wall outlet RJ 45 connector Coated with plastic. Copper wires cannot touch each other. Plastic sheath to computer

8. Coaxial Cable T-shaped connector at back of computer Copper wire core Braided copper shielding and plastic coating Insulator BNC connector links cable to a T connector

9. Fiber Optic Cable Thin glass tube Many glass fibers Plastic coating Metal wire to strengthen cable Fiber and cladding encased in plastic coating Fiber is wrapped in “cladding”

10. Terrestrial Microwave Transmission Line of sight (about 30 miles) Earth Microwave relay station

11. Satellite Microwave Transmission Earth Earth station Earth Station 22,300 miles

12. Cellular Technology use low frequency radio waves calling areas are divided into cells, each with it’s own antennae the antennae –transmit and receive signals –provide an interface with the regular phone network via a switching office

13. Cellular Transmission

14. Sending Data Over Media Signal type –analog or digital Signal transmission speed Parallel versus serial transmission

15. Media Signal

16. Media Speed measured in bps, kbps, mbps twisted pair –1 to 100 mbps fiber optic –up to 200 mbps Satellite transmission –64 to 512 kbps Terrestrial microwave –1.544 mbps

17. Parallel vs. Serial Transmission