3. jarkomp2015_physicallayer14092015
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Materi Jaringan KomputerTRANSCRIPT
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Computer Network + P (ENCE600005)
Physical Layer
Ardiansyah, M.Eng
Computer Engineering Study Program,
Depok, 14 September 2015
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 2
Purpose of the Physical Layer
The Physical Layer
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 3
Purpose of the Physical Layer
Physical Layer Media
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 4
Purpose of the Physical Layer
Physical Layer Standards
Standard Organization
Networking Standards
ISO • ISO 8877: Officially adopted the RJ connectors (e.g., RJ-11, RJ-45) • ISO 11801: Network cabling standard similar to EIA/TIA 568.
EIA/TIA
• TIA-568-C: Telecommunications cabling standards, used by nearly all voice, video and data networks.
• TIA-569-B: Commercial Building Standards for Telecommunications Pathways and Spaces • TIA-598-C: Fiber optic color coding • TIA-942: Telecommunications Infrastructure Standard for Data Centers
ANSI • 568-C: RJ-45 pinouts. Co-developed with EIA/TIA
ITU-T • G.992: ADSL
IEEE • 802.3: Ethernet • 802.11: Wireless LAN (WLAN) & Mesh (Wi-Fi certification) • 802.15: Bluetooth
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 5
Fundamental Principles of Layer 1
Bandwidth
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 6
Fundamental Principles of Layer 1
Throughput
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 7
Bandwidth-Limited Signals
A binary signal and its root-mean-square Fourier amplitudes.
(b) – (c) Successive approximations to the original signal.
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 8
Bandwidth-Limited Signals (2)
(d) – (e) Successive approximations to the
original signal.
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 9
Bandwidth-Limited Signals (3)
Relation between data rate and harmonics.
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 10
Guided Transmission Data
• Magnetic Media
• Twisted Pair
• Coaxial Cable
• Fiber Optics
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 11
Twisted Pair
(a) Category 3 UTP.
(b) Category 5 UTP.
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 12
Coaxial Cable
A coaxial cable.
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 13
Fiber Optics
(a) Three examples of a light ray from inside a silica fiber impinging
on the air/silica boundary at different angles.
(b) Light trapped by total internal reflection.
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 14
Transmission of Light through Fiber
Attenuation of light through fiber in the infrared
region.
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Fiber Cables
(a) Side view of a single fiber.
(b) End view of a sheath with three fibers.
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 16
Fiber Cables (2)
A comparison of semiconductor diodes and LEDs as
light sources.
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Fiber Optic Networks
A fiber optic ring with active repeaters.
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 18
Fiber Optic Networks (2)
A passive star connection in a fiber optics network.
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 19
Wireless Transmission
• The Electromagnetic Spectrum
• Radio Transmission
• Microwave Transmission
• Infrared and Millimeter Waves
• Lightwave Transmission
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 20
The Electromagnetic Spectrum
The electromagnetic spectrum and its uses for
communication.
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 21
Radio Transmission
(a) In the VLF, LF, and MF bands, radio waves follow the
curvature of the earth.
(b) In the HF band, they bounce off the ionosphere.
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 22
Politics of the Electromagnetic Spectrum
The ISM bands in the United States.
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 23
Lightwave Transmission
Convection currents
can interfere with
laser
communication
systems.
A bidirectional
system with two
lasers is pictured
here.
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 24
Communication Satellites
• Geostationary Satellites
• Medium-Earth Orbit Satellites
• Low-Earth Orbit Satellites
• Satellites versus Fiber
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 25
Communication Satellites
Communication satellites and some of their properties,
including altitude above the earth, round-trip delay time
and number of satellites needed for global coverage.
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 26
Communication Satellites (2)
The principal satellite bands.
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 27
Communication Satellites (3)
VSATs using a hub.
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 28
Low-Earth Orbit Satellites Iridium
(a) The Iridium satellites from six necklaces around the earth.
(b) 1628 moving cells cover the earth.
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 29
Globalstar
(a) Relaying in space.
(b) Relaying on the ground.
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 30
Public Switched Telephone System
• Structure of the Telephone System
• The Politics of Telephones
• The Local Loop: Modems, ADSL and Wireless
• Trunks and Multiplexing
• Switching
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 31
Structure of the Telephone System
(a) Fully-interconnected network.
(b) Centralized switch.
(c) Two-level hierarchy.
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Structure of the Telephone System (2)
A typical circuit route for a medium-distance call.
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Major Components of the Telephone
System
• Local loops
Analog twisted pairs going to houses and
businesses
• Trunks
Digital fiber optics connecting the switching offices
• Switching offices
Where calls are moved from one trunk to another
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 34
The Local Loop: Modems, ADSL, and Wireless
The use of both
analog and digital
transmissions for a
computer to
computer call.
Conversion is done
by the modems and
codecs.
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Modems
(a) A binary signal
(b) Amplitude modulation
(c) Frequency modulation
(d) Phase modulation
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 36
Modems (2)
(a) QPSK.
(b) QAM-16.
(c) QAM-64.
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 37
Modems (3)
(a) V.32 for 9600 bps.
(b) V32 bis for 14,400 bps.
(a) (b)
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 38
Digital Subscriber Lines
Bandwidth versus distanced over category 3 UTP for DSL.
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 39
Digital Subscriber Lines (2)
Operation of ADSL using discrete multitone
modulation.
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 40
Digital Subscriber Lines (3)
A typical ADSL
equipment
configuration.
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 41
Frequency Division Multiplexing
(a) The original bandwidths.
(b) The bandwidths raised in frequency.
(b) The multiplexed channel.
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Wavelength Division Multiplexing
Wavelength division multiplexing.
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Time Division Multiplexing
The T1 carrier (1.544 Mbps).
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Time Division Multiplexing (2)
Delta modulation.
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Time Division Multiplexing (3)
Multiplexing T1 streams into higher carriers.
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 46
Time Division Multiplexing (4)
Two back-to-back SONET frames.
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Time Division Multiplexing (5)
SONET and SDH multiplex rates.
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 48
Circuit Switching
(a) Circuit switching.
(b) Packet switching.
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Message Switching
(a) Circuit switching (b) Message switching (c) Packet switching
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Packet Switching
A comparison of circuit switched and packet-switched networks.
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The Mobile Telephone System
• First-Generation Mobile Phones:
Analog Voice
• Second-Generation Mobile Phones:
Digital Voice
• Third-Generation Mobile Phones:
Digital Voice and Data
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Advanced Mobile Phone System
(a) Frequencies are not reused in adjacent cells.
(b) To add more users, smaller cells can be used.
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 53
Channel Categories
The 832 channels are divided into four categories:
• Control (base to mobile) to manage the system
• Paging (base to mobile) to alert users to calls for them
• Access (bidirectional) for call setup and channel assignment
• Data (bidirectional) for voice, fax, or data
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 54
D-AMPS : Digital Advanced Mobile Phone System
(a) A D-AMPS channel with three users.
(b) A D-AMPS channel with six users.
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 55
GSM: Global System for Mobile Communications
GSM uses 124 frequency channels, each of
which uses an eight-slot TDM system
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GSM (2)
A portion of the GSM framing structure.
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 57
CDMA – Code Division Multiple Access
(a) Binary chip sequences for four stations (b) Bipolar chip sequences (c) Six examples of transmissions (d) Recovery of station C’s signal
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 58
Third-Generation Mobile Phones: Digital Voice and Data
Basic services an IMT-2000 network should provide
• High-quality voice transmission
• Messaging (replace e-mail, fax, SMS, chat, etc.)
• Multimedia (music, videos, films, TV, etc.)
• Internet access (web surfing, w/multimedia.)
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 59
Cable Television
• Community Antenna Television
• Internet over Cable
• Spectrum Allocation
• Cable Modems
• ADSL versus Cable
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 60
Community Antenna Television
An early cable television system.
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 61
Internet over Cable
Cable television
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Internet over Cable (2)
The fixed telephone system.
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9/14/2015 Ardiansyah, M.Eng Computer Network + P (ENCE600005), Computer Engineering Study Program 63
Spectrum Allocation
Frequency allocation in a typical cable TV
system used for Internet access
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Cable Modems
Typical details of the upstream and downstream
channels in North America.
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