Transcript Outline - Bilkent University

Hülya Maranezli
&
Kezban Gürcan
OUTLINE
Modem Technologies
Remote Desktop Connection Techniques
Wireless Communication Networks
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
What is modem?
Allows a computer to communicate
Transfer files
Modulator
Demodulator.
Digital to analog converter
Analog to digital converter
Internal Modem
External Modem
PCMCIA Modem
Internal Modem
Inside the computer
On mainboard / onboard
Work with computer
Take power from computer
Cheap
External Modem
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Outside the computer
Work without computer
Take power from elektrycity
Expensive then internal modem
PCMCIA Modem
Standart
Portable
For Laptop
Why do we use modem?
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
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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
DSL (Digital Subscriber Line )
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Home and office
High bandwith
3 commincation chanels
Upstream
Downstream
POTS (Plain Old Public Telephone)
IDSL
18.000 feet
128 Kbp/s
SDSL
12.000 feet
768 Kbp/s
ADSL ( CAP )
17.000 feet
1.5 Mbp/s
12.000 feet
7.0 Mbp/s
4.500 feet
13 Mbp/s
1.000 feet
52 Mbp/s
VDSL * ( F/O )
ADSL (Asymmetric Digital
Subscriber Line)
A form of DSL
ADSL for Home user
Speed of ADSL
Usage of ADSL
Splitter/Micro-Filtre
Split voice and adsl frequency
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.
POTS
(Plain old telephone service)
is a term which describes the voicegrade telephone service.
Advanced forms of telephony such
as ISDN, mobile phones and VoIP.
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.
Bandwidth notation
Send data
Amount of data
Type of Modem
Cable Modem
Fax Modem
Wireless Modem
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
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
Fax Modem
can attach to a personal computer
receive electronic documents as
faxes.
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.
Setup Properties
Connect modem computer and
telephone line
Open internet explorer
10.0.0.2 write
Modem root name and password
Open modem properties
VPI (Virtual Path Identifier) = 8
VCI (Virtual Channel Identifier) = 35
Encapsulation=PPoE LLC
Username=username@ttnet
Password
Reset modem
Link lamp on modem is signed
Dial – Up Connection
Established and maintained for a
limited time duration
The alternative is a dedicated
connection
Called a switched line
Creating Dial-up Connection
Properties
Modem Technologies ADSL Modem
CABLE
What is Cable?
Types of cable.
Creating cable.
What is Cable?
One, two or more wires or optical
fibers bound together
Protective jacket or sheath
Contain both electrical wires and
optical fibers
Types of Cable
Unshielded Twisted Pair-UTP
Optical fiber Cable
Coaxial Cable
Unshielded Twisted Pair-UTP
Unshielded Twisted Pair-UTP
Most Popular
Stranded
Blue-White
Copper
Solid
İnce
More Tel
Unshielded Twisted Pair-UTP
CAT3 Cable
Old Version
10 Mbit
CAT5 Cable
New Version
100 Mbit
CAT5e
Can access gigabit
Unshielded Twisted Pair-UTP
Optical Fiber
Glass or Plastic Fiber
Light or Laser
Optical Fiber
Optical Fiber
Multi-Mode Fiber
Most Popular
Ligth Emitting Diot
Single-Mode Fiber
High data transfer
Expensive
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
Coaxial Cable
Coaxial Cable
RG-8
First Cable
Yellow/Orange or brown
Thick
RG-6
Never use in Computer network
Television Use
RG-58
Cheapernet
Thinnet
Coaxial Cable
RG-8
RG-58
Twisted Pair Cable
Mostly Using
Twisted Pair Cable
Type of Twisted Pair Cable
Shielded Twisted Pair-STP
Covered with Metal
Use in Token Ring network
Not safety enough
Expensive
Now we are making utp
cat5 cable
Straight / Crossover Cable
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
Virtual private network
Private Communications Network
Send data across secured and
encrypted private channels between
two points
Bluetooth Structure
Wireless Personal Area Networks (WPAN)
Connect and exchange information
between devices
Low power consumption, with a short
range
Bluetooth Structure
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
GPRS
The five layer TCP/IP model
5. Application layer
DHCP • DNS • FTP • HTTP • IMAP4 • IRC • NNTP •
XMPP • MIME • POP3 • SIP • SMTP • SNMP • SSH •
TELNET • BGP • RPC • RTP • RTCP • TLS/SSL • SDP •
SOAP • …
4. Transport layer
TCP • UDP • DCCP • SCTP • GTP • …
3. Network layer
IP (IPv4 • IPv6) • ICMP • IGMP • RSVP • IPsec • …
2. Data link layer
ATM • DTM • Ethernet • FDDI • Frame Relay • GPRS •
PPP • ARP • RARP • L2TP • PPTP • …
1. Physical layer
Ethernet physical layer • ISDN • Modems • PLC •
SONET/SDH • G.709 • Wi-Fi • …
WAP
 Wireless Application Protocol
 International standard
 Internet or Mobil Phone
 WML (Wireless Markup Language)
 Commonplace activities
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email by mobile phone
tracking of stock market prices
sports results
news headlines
music downloads
Sources
Wireless Local Area Networks (Benny Bing)
Bluetooth (Jennifer Bray and Charles F Sturman)
Modems and Communication on IBM PCs
(W.David Schwaderer)
Kablosuz Ağlar (Alper Özbilen)
Bilgisayar Ağları ve Güvenliği
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