2.6 ethernet ieee 802.3

2.6 ethernet ieee 802.32.6 ethernet ieee 802.32.6 ethernet ieee 802.3

1. Communication
Networks
Ethernet
–IEEE 802.3

2. Overview of Module -2
•Framing
•What is Framing
•Types of Framing
•Methods for identifying the
boundaries
•Flow Control
•What is flow control
•Types of flow control
•Access Control
•What is access control
•Types of access control
•Ethernet –IEEE 802.3
•Evolution of Ethernet
•Frame Format of Ethernet
•Access Control for Ethernet
•Performance Evaluation of Ethernet
•WLAN –IEEE 802.11
•Architecture
•Bluetooth
•WIFI
•Zigbee
•6LowPan
•Network Layer Services
•IPv4
•Packet switching
•Network Layer Protocols
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3. In this session:
EVOLUTION FRAME FORMAT
ADDRESSING
ACCESS METHOD EFFICIENCY
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4. Ethernet –Evolution
•The Ethernet LAN was developed in the 1970s by Robert Metcalfe
and David Boggs. Since then, it has gone through four generations:
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5. Evolution of Ethernet –Standard Ethernet
•Entrylevelethernet.
•Operatedatdatarateof10Mbps
•Definedtheframeformat
•Use48bitaddressing
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6. Evolution of Ethernet –Fast Ethernet
•Upgradethedatarateto100Mbps.
•MakeitcompatiblewithStandard
Ethernet.
•Keepthesame48-bitaddress.
•Keepthesameframeformat.
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7. Evolution of Ethernet –Gigabit Ethernet
•Upgradethedatarateto1Gbps.
•MakeitcompatiblewithStandardorFastEthernet.
•Usethesame48-bitaddress.
•Usethesameframeformat.
•Keepthesameminimumandmaximumframe
lengths.
•SupportautonegotiationasdefinedinFastEthernet.
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8. Evolution of Ethernet –10 Gigabit Ethernet
•upgrading the data rate to 10 Gbps,
•keeping the same frame size and format,
•allowing the interconnection of LANs, MANs, and WAN
possible.
•This data rate is possible only with fiber-optic technology
at this time.
•The standard defines two types of physical layers: LAN
PHY and WAN PHY.
•The first is designed to support existing LANs; the
second actually defines a WANwith links connected
through SONET OC-192.

9. Fiberoptic Ethernet

10. Ethernet Frame Format
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11. PREAMBLE:
•7BYTEScontainingalternate0’sand1’s
•Thisalertsthereceivingsystemaboutthe
incomingframeandhelpsinsynchronization
•Thisisaddedatphysicallayer.Notapartof
frame.
SFD (Start Frame Delimiter):
•This segment is 1 byte long.
•This indicates the start of the frame.
•The last 2 bits (11) alerts the receiver that the
next field is destination address.
Destination Address (DA):
•It is of 6 bytes.
•Contains the physical address of the
destination host or stations.
Source Address (SA):
•It is of 6 bytes.
•Contains the physical address of the Source host
or stations.
Length or Type:
•Used for 2 purpose
•Ethernet (Type) –To define the upper layer
protocol.
•IEEE (Length) –To specify the number of bytes in
the data field.
Data & Padding:
•It can be a minimum size from 46 bytes to
maximum of 1500 bytes.
•It carries data encapsulated from the upper
layer
Cyclic Redundancy Check :
•This field contains Error Detection Information.

12. Ethernet -Addressing
•Already Discussed in previous sections
•Ethernet uses MAC Address. Refer to Physical Addressing topic we
studied already
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13. Ethernet –Access Mechanism -CSMA CD
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14. Efficiency of Standard Ethernet
•TheefficiencyoftheEthernetisdefinedastheratioofthetimeusedbya
stationtosenddatatothetimethemediumisoccupiedbythisstation.
ThepracticalefficiencyofstandardEthernethasbeenmeasuredtobe
Efficiency =1 / (1 + 6.4 *a)
•inwhichtheparameter“a”isthenumberofframesthatcanfitonthe
medium.
•Itcanbecalculatedasa=(propagationdelay)/(transmissiondelay).
•Notethatasthevalueofparameteradecreases,theefficiencyincreases.
•Thismeansthatifthelengthofthemediaisshorterortheframesizelonger,
theefficiencyincreases.
•Intheidealcase,a=0andtheefficiencyis1.
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15. Session Summary
Ethernet Concepts
•Evolution of Ethernet
•Standard Ethernet and their variations
•Fast Ethernet and their variations
•Gigabit Ethernet and their variations
•10 Gigabit Ethernet and their variations
•Frame Format of Ethernet
•Access Control for Ethernet –[CSMA –CD]
•Performance Evaluation of Ethernet

16. References:
•BehrouzA.Forouzan,―DatacommunicationandNetworking,Fifth
Edition,TataMcGraw–Hill,2013
•LarryL.Peterson,BruceS.Davie,―ComputerNetworks:ASystems
Approach,FifthEdition,MorganKaufmannPublishers,2011.
•FewonlineReferences(WillbeMentionedinthedescriptionSection)
Thank You…