Hlya Maranezli

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Hülya MaranezliKezban Gürcan
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OUTLINE

• Modem Technologies
• Remote Desktop Connection Techniques
• Wireless Communication Networks

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Modem

• What is modem?
• Internal
• External
• PCMCIA
• Why do we use modem?
• DSL ADSL
• Upstream/Downstream bands
• POTS
• Frequencies
• Bandwidth notation
• Type of Modem
• Cable Modem
• Fax Modem
• Wireless Modem
• Setup Properties

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What is modem?

• Allows a computer to communicate
• Transfer files
• Modulator
• Demodulator.
• Digital to analog converter
• Analog to digital converter

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Internal Modem External ModemPCMCIA Modem
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Internal Modem

• Inside the computer
• On mainboard / onboard
• Work with computer
• Take power from computer
• Cheap

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External Modem

• Outside the computer
• Work without computer
• Take power from elektrycity
• Expensive then internal modem

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PCMCIA Modem

• Standart
• Portable
• For Laptop

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Why do we use modem?
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• Fifteen popular reasons to own and use a modem
• Download 1000's of software programs from online
  services and BBSs.
• Use cheap electronic mail (e-mail) and thus avoid
  snail-mail (mail delivered by postmen)
• Exchange files and e-mail with your work
  computer.
• Get up to the minute weather, stock quotes,
  sports information.
• Send faxes.
• Do research using the most up-to-date from online
  databases.
• Earn a college degree.
• Work from your home and send your work to the at
  the office.
• Play online games and download the latest
  programs.
• Do real detective work using electronic and
  "superbureaus."
• Join a "CHAT" board or global "chat forum."
• Subscribe to free electronic journals, and access
  forums and newsgroups.
• Use your modem to connect to your county records.
• Connect to your local library using their
  "dial-up" service to search for books from the
  comfort of your own home. You can find out if the
  book you want is available or if it has been
  checked out. Many local libraries also have
  collections of CD-ROM databases like InfoTrak
  which can be accessed via modem. To find out
  about such services all you have to do is call
  your library and ask.
• Connect to the Library of Congress and do an
  online search

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DSL (Digital Subscriber Line )

• Home and office
• High bandwith
• 3 commincation chanels
• Upstream
• Downstream
• POTS (Plain Old Public Telephone)

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ADSL (Asymmetric Digital Subscriber Line)

• A form of DSL
• ADSL for Home user
• Speed of ADSL
• Usage of ADSL

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Splitter/Micro-Filtre

• Split voice and adsl frequency

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UpStream / DownStream

• ADSL uses two separate frequency bands
• Upstream bands.
• Downstream bands.
• The upstream band
• the end user to the telephone central office.
• The downstream band
• the central office to the end user.

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POTS (Plain old telephone service)

• is a term which describes the voice-grade
  telephone service.
• Advanced forms of telephony such as ISDN, mobile
  phones and VoIP.

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Frequencies

• the number of occurrences of a repeated event per
  unit of time.
• the rate of change of phase of a sinusoidal
  waveform.

Sine waves of various frequencies the bottom
waves have higher frequencies than those above.
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Bandwidth notation

• Send data
• Amount of data

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Type of Modem

• Cable Modem
• Fax Modem
• Wireless Modem

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Cable Modem

• A type of modem
• External modem
• access to a data signal sent over the cable
  television infrastructure.
• cable modems connect to the computer via an
  Ethernet port

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Internet packets are combined with standard TV
programming in a cable modem system. The cable
modem termination system (CMTS) is responsible
for packet to RF conversion, routing, bridging,
filtering and traffic shaping
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Fax Modem

• can attach to a personal computer
• receive electronic documents as faxes.

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Wireless Modem

• connects to a wireless network instead of to the
  telephone system
• your wireless ISP (Internet Service Provider) and
  you can then access the Internet.

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Setup Properties

• Connect modem computer and telephone line
• Open internet explorer
• 10.0.0.2 write
• Modem root name and password
• Open modem properties

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• VPI (Virtual Path Identifier) 8
• VCI (Virtual Channel Identifier) 35
• EncapsulationPPoE LLC
• Usernameusername_at_ttnet
• Password
• Reset modem 
• Link lamp on modem is signed

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Dial Up Connection

• Established and maintained for a limited time
  duration
• The alternative is a dedicated connection
• Called a switched line

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Creating Dial-up Connection
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Properties
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Modem Technologies ADSL Modem

• CABLE
• What is Cable?
• Types of cable.
• Creating cable.

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What is Cable?

• One, two or more wires or optical fibers bound
  together
• Protective jacket or sheath
• Contain both electrical wires and optical fibers

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Types of Cable

• Unshielded Twisted Pair-UTP
• Optical fiber Cable
• Coaxial Cable

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Unshielded Twisted Pair-UTP
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Unshielded Twisted Pair-UTP

• Most Popular
• Stranded
• Blue-White
• Copper
• Solid
• Ince
• More Tel

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Unshielded Twisted Pair-UTP

• CAT3 Cable
• Old Version
• 10 Mbit
• CAT5 Cable
• New Version
• 100 Mbit
• CAT5e
• Can access gigabit

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Unshielded Twisted Pair-UTP
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Optical Fiber

• Glass or Plastic Fiber
• Light or Laser

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Optical Fiber
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Optical Fiber

• Multi-Mode Fiber
• Most Popular
• Ligth Emitting Diot
• Single-Mode Fiber
• High data transfer
• Expensive

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Coaxial Cable

• Electrical Cable
• Surrounded by
• An insulating spacer
• A cylindrical conducting sheath
• A final insulating layer (jacket)
• Used as a high-Frequency tranmisson line to carry
  a highFrequency or broadband signal

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Coaxial Cable
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Coaxial Cable

• RG-8
• First Cable
• Yellow/Orange or brown
•  Thick
• RG-6
• Never use in Computer network
• Television Use
• RG-58
• Cheapernet
• Thinnet

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Coaxial Cable
RG-8
RG-58
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Twisted Pair Cable

• Mostly Using

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Twisted Pair Cable

• Type of Twisted Pair Cable
• Shielded Twisted Pair-STP
• Covered with Metal
• Use in Token Ring network
• Not safety enough
• Expensive

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Now we are making utp cat5 cable
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Straight / Crossover Cable
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Remote Desktop Connection Techniques

• Multi-Channel Protocol
• Version 4.0
• Version 5.0
• Windows 2000 Server
• Version 5.1
• Version 5.2
• Windows 2003 Server
• Version 6.0
• Current Version

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Virtual private network

• Private Communications Network
• Send data across secured and encrypted private
  channels between two points

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Bluetooth Structure

• Wireless Personal Area Networks (WPAN)
• Connect and exchange information between devices
• Low power consumption, with a short range

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Bluetooth Structure
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GPRS

• General Packet Radio Service
• Packet-Switched
• Multiple users share the same transmission
  channel
• Time domain statistical multiplexing
• Several users to share the same frequency channel
  
• First-come first-served packet scheduling
• Supported IP, PPP and X.25 connections

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GPRS
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WAP

• Wireless Application Protocol
• International standard
• Internet or Mobil Phone
• WML (Wireless Markup Language)
• Commonplace activities
• email by mobile phone
• tracking of stock market prices
• sports results
• news headlines
• music downloads

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Sources

• Wireless Local Area Networks (Benny Bing)
• Bluetooth (Jennifer Bray and Charles F Sturman)
• Modems and Communication on IBM PCs (W.David
  Schwaderer)
• Kablosuz Aglar (Alper Özbilen)
• Bilgisayar Aglari ve Güvenligi

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• FOR
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