Lecture Exam Monday 5:30 6:30

1
Lecture Exam Monday 530 630

• 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
Coated with plastic. Copper wires cannot touch
each other.
RJ 45 wall outlet
Plastic sheath
to computer
RJ 45 connector
8
Coaxial Cable
T-shaped connector at back of computer
Copper wire core
Braided copper shielding and plastic coating
BNC connector links cable to a T connector
Insulator
9
Fiber Optic Cable
Many glass fibers
Thin glass tube
Plasticcoating
Metal wire to strengthen cable
Fiber and cladding encased in plastic coating
Fiber is wrapped in cladding
10
Terrestrial Microwave Transmission
Microwaverelay station
Line of sight(about 30 miles)
Microwaverelay station
Microwaverelay station
Earth
11
Satellite Microwave Transmission
22,300 miles
Earth Station
Earth station
Earth
12
Cellular Technology

• use low frequency radio waves
• calling areas are divided into cells, each with
  its 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