Overview of Telecommunications ENGR 475 Harding University August

Overview of Telecommunications ENGR 475 Harding University August 22, 2006 Jonathan White

General Overview l l l 2 tests 1 comprehensive final 10 – 12 homework assignments l l A few quizzes 1 notebook with notes, hw, tests, etc… 1 project l l l 1 will be a program Make a telephone Will start in class 1 report l 3 pages, choose your own topic, may present

Class Design 1/3 – From the book, general information, Power. Point / on board. l Don’t need to write down information from the Power. Point l Test questions and homework will be general knowledge: What is CDMA used for? l What does LEC stand for? l What revolution did SS 7 bring about? l l Homework questions will come from the back of each chapter l Fairly easy if you’ve read the chapter

Class Design l 1/3 – Working Telecommunications mathlike problems: l Sampling, signal to noise ratio, l Line encoding, multiplexing, line speeds l Traffic engineering, Erlang-B calculations, busy probabilities l Queuing theory (a little) l Notes and worked examples will all be on the board. l You must write this down

Class Design l 1/3 new Telecommunications information: l l Some from book Some from the Internet Mix of general knowledge and problems Topics: l l DSL, cable modems, cellular phones, Bluetooth, WAP, 3 G wireless, fiber phone systems, RFID, VOIP. Any other topics that you may be interested in?

Class Design l Hopefully, we will do a mix of each 3 areas every couple class periods. l Difficulty of class l Attendance l Purpose of class

Telecom History l l l l l What is voice Telegraph Radio Telephone AT & T years 1996 Digital communications Mobile communications Internet

Voice Mediums l Bandwidth l Frequencies l Sampling, signal to noise ratio l Usage rates l

Telephone Network / Set l Lots to memorize: l LATA, CLEC, CO, PSTN, tip, ring, PBX, simplex, duplex

Analog vs. Digital Noise, amplifier vs repeater, types of signaling l Why digital is not always better than analog l Differences between circuit and packet switching l

Information on Telephone Industry l Types of carriers l Long distance, local, 1 -800, pay phone, etc. . Types of telephone lines/trunks l PBX – Private Branch Exchanges l Newer telephone technologies l l Automated call answering l Fax processing l OCR

T Carrier System T 1 and T 3 architectures l Framing and CRC l

Math behind Ethernet Pure Aloha l Shared medium technologies l Speed over various mediums l

Other Voice/Data technologies l If time permits… l FDDI, l Token Ring, Frame Relay, ISDN ATM l Cells l Cell formats l Public switches l SS 7

New Technologies l l l DSL/Cable Modem Wireless cellular phones WAP l l l l Downsides 3 G wireless SONET VOIP RFID Bluetooth Legal issues involving telecommunications