ECEN5553 Telecom Systems Week #1  Read [1] "Telecommunications and the IEEE Communications Society", p. 1-9 [2] "The Beginnings of Packet Switching: Some Underlying Concepts"  Exam #1: Lecture 14, 16 September (Live)  No later than 23 September (Remote DL)  Outline: Lecture 22, 5 October (Live)  No later than 12 October (Remote DL)

Exams n Closed Book & Notes n 80-90% on class notes n 10-20% on Required Readings n Start Studying NOW!

Term Paper n Probe Further n Telecommunications topic of your choice n 1, ,400 words (about 7-14 pages) n Topic MUST be approved by the instructor u Submit 5-10 line Outline ASAP (NLT 5 October 2016, Lecture 22) n Due 4 November 2016, Lecture 34 u Remote students: all due dates are +1 week n Visit 5553 Home Page for more details

Telecommunications n Long Distance Communications via Electro-Magnetic Means n Long Distance = Distance > Normal Voice Conversation

ECEN 5553 Telecom Systems n Core Course for M.S. Telecom Management B.S. inEngineering Management Information Systems Computer Science n Elective: Electrical Engineering n Elective: Others interested in Data, Voice, & Video Networks

Student Skill Sets... None Years Experience Technical Background None A Lot Where instructor is pitching the class.

Cheating n Don’t do it! n My idol: Judge Isaac Parker U.S. Court: Western District of Arkansas a.k.a. “Hanging Judge Parker” a.k.a. “Hanging Judge Parker”

Previous Term Paper tolls... n Fall Students in the class 11 F’s for Plagiarism 12 Major Citation Problems -20 to -40 points off n Spring 2002/Fall F's for Plagiarism n Fall 2015 (30 students) 2 Incidents

Accessing OSU Library Databases PCServer OSU Based System IEEE IEEE Server verifies legal user by checking IP Source Address.

Accessing OSU Library Databases PCServer Home/Office Based System IEEE IEEE Server blocks usage due to incorrect IP Source Address.

Accessing OSU Library Databases PCServer Home/Office Based System IEEE OSU Proxy Server allows access. Maps your IP address to an OSU address. Server OSU

Required Readings n Accessing from any OSU campus? u Article links should work fine n Accessing from off campus? u You must log into the proxy server u u Sometimes the Home Page links then work u u Sometimes you have to search for article

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ISO OSI Seven Layer Model n Layer 7 Application n Layer 6 Presentation Windows API n Layer 5 Session TCP n Layer 4 TransportTCP n Layer 3 Network IP n Layer 2 Data LinkMotherboard n Layer 1 Physical Motherboard

Five Layer TCP/IP Model n Layer 5 Application Application n Layer 5 Presentation n Layer 4 Session Transport (TCP) n Layer 4 Transport n Layer 3 Network Internet (IP) n Layer 2 Data LinkData Link n Layer 1 Physical Physical

Business Version of Communications Theory: Moving Bits (OSI Layer 1) n Bandwidth... ‘...an assigned range of frequencies...’ n A sinusoid such as A*cos(2πft + θ) only has energy at a single frequency (f Hertz) n Any waveform can be constructed by adding together a bunch of sinusoids u The frequency range of the sinusoids required to do this constitutes the signal's bandwidth n Fourier Theory specifies the sinusoids required

200 Hz Cosine Wave 5/100 second plotted

Generating a Square Wave vp 5 Hz 1/3 vp 15 Hz

Generating a Square Wave /5 vp 25 Hz Hz + 15 Hz

Generating a Square Wave /7 vp 35 Hz Hz + 15 Hz + 25 Hz

Generating a Square Wave Hz + 15 Hz + 25 Hz + 35 Hz cos2*pi*5t - (1/3)cos2*pi*15t + (1/5)cos2*pi*25t - (1/7)cos2*pi*35t) 5 cycle per second "square wave" generated using first 4 sinusoids, Absolute Bandwidth = 35 Hertz.

Generating a Square Wave... 5 cycle per second square wave generated using first 50 sinusoids, Absolute Bandwidth = 495 Hertz

Generating a Square Wave... 5 cycle per second square wave generated using first 100 sinusoids, Absolute Bandwidth = 995 Hertz