Florida International University

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Florida International University CGS 3300 Introduction to Information Systems Wednesday, September 19, 2018Wednesday, September 19, 2018 Gerard Klonarides Intro to email

How does an email travel down the data lines? 56 Kbps V.90 modem DSL Cable modem ISDN T1/T3 Wireless connection Wednesday, September 19, 2018Wednesday, September 19, 2018 Gerard Klonarides Intro to email

Email travels by V.90 Modem 56 Kbps V.90 Modem Telco C.O. Source ISP Destination ISP Wednesday, September 19, 2018Wednesday, September 19, 2018 Gerard Klonarides Intro to email

Email travels by V.90 Modem Modem converts analog email 56 Kbps V.90 Modem digital digital Telco C.O. Enters wire in analog form ADC at C.O. converts to digital Wednesday, September 19, 2018Wednesday, September 19, 2018 Gerard Klonarides Intro to email

What is the speed of a 56Kbps V.90 Modem? Download speed <= 53Kbps Upload speed <= 33.6 Kbps http://computingcentral.msn.com/internet/speedtest.asp Wednesday, September 19, 2018Wednesday, September 19, 2018 Gerard Klonarides Intro to email

xDSL, ADSL, RADSL or G.lite ALCATEL DOWNLOAD <= 1.5 Mbps UPLOAD <= 364Kbps www.dslreports.com Wednesday, September 19, 2018Wednesday, September 19, 2018 Gerard Klonarides Intro to email

Gerard Klonarides Intro to email Cable modem Cable – one way Download great – Upload through telephone and 56K modem Cable - two way new equipment required Cable - two way satellite transmission Cable with fiber optics transmission Wednesday, September 19, 2018Wednesday, September 19, 2018 Gerard Klonarides Intro to email

ISDN Integrated Services Digital Network ISDN BRI WALL JACK RJ45 ISDN MODEM Telco C.O. DSU/CSU DSU/CSU = Data Service Unit/Channel Service Unit Converts one digital signal to another type of digital signal Wednesday, September 19, 2018Wednesday, September 19, 2018 Gerard Klonarides Intro to email

ISDN Integrated Services Digital Network 64 K bps B 64 Kbps B 32 Kbps D signaling Use both lines to get 128 Kbps : both ways Use one line for voice and one line for data Use one line for fax and one line for data Use one line for voice and one line for fax Wednesday, September 19, 2018Wednesday, September 19, 2018 Gerard Klonarides Intro to email

Gerard Klonarides Intro to email T1/T3 Network What is a T1 or a T3? A T1 consists of 24 digital lines Of 64 Kbps transmission speed 24 x 64 Kbps = 1.544 Mbps Wednesday, September 19, 2018Wednesday, September 19, 2018 Gerard Klonarides Intro to email

Getting into details of a T1: The voice signal is sampled at 8,000 hz x 8 bits= 64Kbps The smallest unit of channel combination in the US is 24 channels 24 x 64 = 1, 536,000 Add One additional bit is inserted into the stream for every 192 bits of transfer, to establish synchronization and we have 1,536,000 divide by 8,000 = 192 Add 1 to 192 = 193 x 8,000 = 1.544 Mbps Wednesday, September 19, 2018Wednesday, September 19, 2018 Gerard Klonarides Intro to email

Gerard Klonarides Intro to email 2 way satellite Unlike DirecPC, which needs a standard phone line to send data to the Internet, StarBand is a two-way service: It sends and receives data through the satellite antenna. StarBand doesn’t require a phone line and is always connected to the Internet. The StarBand service is available from two sources: RadioShack and EchoStar Communications dish Network dealers. If you go through RadioShack, you’ll have to purchase a complete PC along with the antenna. The software and two PCI cards are preinstalled in the PC, and the 24- by 36-inch elliptical antenna has to be professionally installed, since alignment is critical to system performance. Cost varies depending on what PC you choose, but figure on spending at least $900. Monthly service costs $59.95, with a one-year commitment. When you order the service through StarBand, you are provided with MSN as your ISP and supplied with an MSN Hotmail account. Wednesday, September 19, 2018Wednesday, September 19, 2018 Gerard Klonarides Intro to email

Gerard Klonarides Intro to email Who shares bandwidth? YES NO Cable Wireless T1 T3 56K V.90 Modem xDSL ISDN Wednesday, September 19, 2018Wednesday, September 19, 2018 Gerard Klonarides Intro to email