1 physical transmission options chapter 3. 2 learning objectives describe the functions of the...
TRANSCRIPT
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Physical Transmission Options
Chapter 3
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Learning ObjectivesDescribe the functions of the principal networking standards organizationsDescribe the various kinds of network media, including coaxial, twisted-pair, and fiber-optic media, and identify which to use in a given network configurationDescribe the basics of wireless communications
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Learning ObjectivesDiscuss high-speed technologies for twisted-pair and fiber-optic cable
Compare packet and cell implementations and the interfaces used by each
Explain WAN carrier types for point-to-point, T-carrier, SONET, ISDN, and wireless topologies
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Network Standards Organizations
Help ensure that equipment from different manufacturers can be integrated
Key role in growth of networks and network equipment
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Network Standards Organizations
ANSI American National Standards Institute
IEEE Institute of Electrical and Electronics Engineers
ITU International Telecommunications Union
ISO International Organization for Standardization
ISOC Internet Society
IETF Internet Society and the Internet Engineering Task Force
EIA/TIA Electronic Industries Alliance and the Telecommunications Industry Association
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ANSIEstablished in 1918
Standards for wide range of products
Computer industry standards:Screen-display attributes
Digital telecommunications
Fiber-optic cable transmissions
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IEEEInternational organization of scientists, engineers, technicians, and educators
Develops networking standards for network cabling and data transmissions
802 standards
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ITUSets telecommunications standards for modem and WAN communications
International organization
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ISOEstablishes communications and networking standards
Known for its contributions to network protocol standards
International organization
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ISOC and IETFISOC
Sponsors conferences and publications and oversees Internet standardsNonprofit international organizationSupporter of Internet Corporation for Assigned Names and Numbers (ICANN)
IETFArm of ISOC that works on Internet-related technical issues such as routing
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EIA and TIAEIA
Network cabling standards and electrical interface standards
TIAStandards body within EIA that develops telecommunications and cabling standards
Structured wiring, horizontal cabling, backbone cablingWiring closet configurations
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Physical Transmission Options for LANs and WANsMedia types
Interface types
WAN carrier types
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Communications Media TypesCoaxial cable
Based on copper wire construction
Twisted-pair cableBased on copper wire construction
Fiber-optic cableGlass (usually), or plastic
Wireless technologiesRadio or microwaves
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Factors to Consider When Choosing a Medium
Data transfer speedUse in specific network topologiesDistance requirementsCable and cable component costsAdditional network equipment that might be requiredFlexibility and ease of installationImmunity to interference from outside sourcesUpgrade options
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Coaxial CableCopper core surrounded by insulation
Insulation surrounded by another conducting material, which is covered by an outer insulating material
TypesThick coax cable (thickwire or thicknet)
Thin coax cable
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Thick Coax Cable
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Connecting to Thick Coax Cable
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Thick Coax Cable Properties
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Thin Coax CableAttaches to a bayonet nut connector (BNC)
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Thin Coax Cable Properties
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Twisted-Pair CableFlexible cable that contains pairs of insulated copper wires that are twisted together for reduction of EMI and RFI and covered with an outer insulating jacketTypically used on LANs to bring network to desktopConnects to network devices with RJ-45 plug-in connectors
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Twisted-Pair Cable
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Types of Twisted-Pair CableShielded twisted-pair (STP) cable
Pairs of insulated wires that are twisted together, surrounded by shielding material for added EMI and RFI protection, all inside a protective jacket
Unshielded twisted-pair (UTP) cableNo shielding material between pairs of insulated wires twisted together and cable’s outside jacket
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STP and UTP Cable
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Twisted-Pair Cable Standards
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Twisted-Pair Cable Types for Token Ring Applications
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Properties ofTwisted-Pair Cable
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Properties ofTwisted-Pair Cable
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Token Ring Design Specs
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Fiber-Optic CableGlass or plastic fiber core inside protective cladding material, covered by plastic PVC outer jacket
Usually uses infrared light for signal transmission
Used to connect networks on LANsand to connect LANs into WANs
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Fiber-Optic CableAdvantages
Able to sustain transmissions over long distances due to high bandwidth and low attenuation
No EMI or RFI problems
Difficult to place unauthorized taps
DisadvantagesVery fragile
Relatively expensive
Requires specialized training to install
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Fiber-Optic Cable ModesSingle-mode
MultimodeStep index
Graded index
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Properties of Single-Mode Fiber-Optic Cable
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Properties of Multimode Fiber-Optic Cable
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Hybrid Fiber/Coax(HFC) Cables
Single cable sheath containing a combination of fibers and copper cables in different combinations for different implementations
Full HFC system can deliver:Plain Old Telephone Service (POTS)
Up to 37 analog TV channels
Up to 188 digital TV channels
Up to 464 digital point channels
High-speed, two-way digital data link for PCs
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High-Speed Technologies for Twisted-Pair and Fiber-Optic Cable
Fast Ethernet
Gigabit Ethernet
10 Gigabit Ethernet
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Fast EthernetEthernet communications at speeds up to 100 Mbps as defined under the:
802.3u standardMore commonly used
Based on CSMA/CD
802.12 standardUses demand priority
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The IEEE 802.3u Standard
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The IEEE 802.12 Standard
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Gigabit EthernetProvides even faster network communications
Particularly important for backbone architectures
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Gigabit Ethernet Specifications
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10 Gigabit EthernetPositioned to become popular LAN and WAN alternative; promises very high-speed communications
Does not use CSMA/CD as the transmission method
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10 Gigabit Ethernet Specifications
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Wireless CommunicationsTransmit signal through air or atmosphere
Good alternative when cable is not physically or economically feasible
Can experience interference from other signals using same media
Types availableRadio waves and infrared signals (short-distance)
Microwave and satellite (long-distance)
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Data Interface TypesData is transported on networks in packets or cells
Each type of transport requires specialized interfaces for physical network connections
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Packet TransmissionUsed at lower bandwidth installationsMost commonly used to carry data on LANsRequires transceivers, appropriate cable interfaces, and network driversTiming information for multiple packet transfersPackets are physically transported on a network via network interface card (NIC)Packets contain variable amount of data in multiples of eight bits
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Generic Packet FormatFormat determined by protocol used on network
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Cell TransmissionUsed for very high-bandwidth implementationsEnables high-speed communications between LANs and on WANsRequires transceivers, appropriate cable interfaces, and network driversCells contain fixed amount of data formatted to be transmitted at high speedsPrimarily used in Asynchronous Transfer Mode (ATM)
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Generic Cell Format
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WAN Carrier TypesPoint-to-point
T-carrier
SONET (synchronous optical network)
ISDN (Integrated Services Digital Network)
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Point-to-PointTwo stations communicate through public dial-up or leased lines
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T-CarrierNormally available through telecommunications carriers
Typically come out of channel banks at telecommunications company
Five types of channel banks: D-1 through D-4 and Digital Carrier Trunk
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T-CarrierDS-x
Relates to OSI Physical layer, which influences electrical transmission
T-xRelates to Data Link layer, which addresses protocol and data-formatting issues
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T-Carrier Switching Techniques
Time division multiple access (TDMA)
Combination of TDMA and statistical multiple access
Fast packet technology
Multiplexer
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T-Carrier ConnectionsDigital access cross-connects (DACS)
DS-1 (T-1) connectivity
Combined DS-0 or fractional connectivity
Single DS-0 channels
Combination channel service unit (CSU) and data service unit (DSU)
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Connecting with a CSU/DSU
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SONETUses single-mode and multimode fiber-optic cable and communications based on T-3 services
Allows for high-speed data transmission, enabling delivery of voice, data, and video
Converts electrical-based STS-x signal to optical-based signal (optical carrier or OC)
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SONET STS-1 Frame
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SONET STS-x and OC-x Transmission Rates
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ISDNWAN technology for delivering voice, data, and video services over telephone lines, using a combination of channelsPhysical line is a POTS or T-1 (twisted-pair or fiber-optic), with ISDN equipment at the telco and customerMethods of placing digital signals on network
Time-compression multiplexing (TCM)Echo cancellation
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Chapter SummaryStandards organizations that influence network transmission techniques and media
Communications cabling media
High-speed technologiesFast Ethernet
Gigabit Ethernet
10 Gigabit Ethernet
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Chapter SummaryHow data is transported by using packets and cell formatsSpecialized carrier methods
Point-to-pointT-carrierSONETISDNWireless transmission