Lecture03 - Tuesday April 8 Lab#1 Grading is in progress...

Info iconThis preview shows pages 1–12. Sign up to view the full content.

View Full Document Right Arrow Icon
Tuesday, April 8 Lab #1 Grading is in progress Homework #1 Hardcopy due Thursday, January 17 (beginning of class) Helpful link for P7: http://hyperphysics.phy-astr.gsu.edu/Hbase/math/disfcn.html#c2 Lab #2 First session starts today at 2:00 Quiz #1 Thursday in class
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Apply to MECOP Deadline is April 10 Anybody interested in an REU in AI? See me after class or send me an email Change in Paul²son’s office hours M: 12:00 – 2:00 pm W: 10:00 - 11:50 am, 1:00 - 2:50 pm R: 2:00 - 3:50 pm F: 10:00 - 11:50 am other times by appointment Might change (again)
Background image of page 2
Today’s topics Physical media Structure of the Internet Network layering models Networks attacks Security Homework/problems
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Physical Media Why is it needed? to propagate bits between sender/receiver pairs What is it? a physical link that lies between sender & receiver Two types of media: guided media: signals propagate in solid media unguided media: signals propagate freely, e.g., wireless radio
Background image of page 4
Guided Media: twisted-pair copper wire two insulated copper wires Category 3: 10 Mbps Ethernet Category 5: 100Mbps Ethernet still used for high-speed LAN; e.g., ADSL rate depends on thickness and distance make up 99% of wired connections may pick up interference (“noise”)
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
RJ-45 twisted pair connector : both ends same; used with hubs, switches crossover : one end each; direct connection Pins 1, 2: transmit Pins 3, 6: receive Pins 4, 5, 7, 8: not used for network data
Background image of page 6
Guided Media: coaxial cable two concentric copper conductors baseband: single channel on cable legacy Ethernet broadband: multiple channels on cable hybrid fiber-coax cable (HFC) Cable TV rate depends on thickness and distance less interference than twisted pair
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Baseband and broadband Baseband uses a small part of wave spectrum and sends only one signal at a time Broadband uses a larger part of the wave spectrum and uses frequency division multiplexing to send multiple signals at the same time
Background image of page 8
Frequency division multiplexing (FDM) Achieves multiplexing by using different carrier frequencies Frequencies must be separated to avoid interference Receiver can "tune" to specific frequency and extract modulation for that one channel Useful only in media that can carry multiple signals with different frequencies high-bandwidth required
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Guided Media: fiber optic cable glass fiber carrying light pulses, each pulse represents one bit high-speed operation: high-speed point-to-point transmission (e.g., 10’s- 100’s Gbps) low error rate: immune to electromagnetic noise and other interference
Background image of page 10
Wave length division Frequency division multiplexing can be applied to optical transmission known as wave-length division multiplexing ( WDM ) When many wavelengths are used, the term becomes Dense Wave Division Multiplexing (DWDM) Informally, color division multiplexing Receiver separates frequencies using a prism red, orange, etc
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 12
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 45

Lecture03 - Tuesday April 8 Lab#1 Grading is in progress...

This preview shows document pages 1 - 12. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online