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IST 201. Chapter 7. Legacy Ethernet. 10Base5 10Base2 10BaseT Common Characteristics Timing parameters Frame format Transmission process Basic design rule. Parameters. Bit time 100 nanoseconds Slot time 512 bit-times Interframe spacing 96 bits Collision attempt limit 16

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Ist 201

IST 201

Chapter 7


Legacy ethernet
Legacy Ethernet

  • 10Base5

  • 10Base2

  • 10BaseT

  • Common Characteristics

    • Timing parameters

    • Frame format

    • Transmission process

    • Basic design rule


Parameters
Parameters

  • Bit time 100 nanoseconds

  • Slot time 512 bit-times

  • Interframe spacing 96 bits

  • Collision attempt limit 16

  • Collision back-off limit 10

  • Collision jam size 32 bits

  • Max. frame size 1518 octets

  • Min. frame size 512 bits/64 octets


Ethernet frame
Ethernet Frame

  • Must be between 64 – 1518 bytes

    #Octets 7 1 6 6 2 46-1500 4

S

F

D

Length

Type

Preamble

Destination

Source

Data

FCS


Encoding
Encoding

  • Describes how bits are represented by voltages.


Manchester encoding
Manchester Encoding

  • Used in 10 Mbps Ethernet

  • Direction of the edge transition indicates whether it is a one or zero.

  • Low to High transition 01 represents 1

  • High to Low transition 10 represents 0

  • Self-clocking – each bit is transmitted over a predetermined time period

Called

Biphase

code


Shared ethernet
Shared Ethernet

  • Share collision domain

  • Multiple types of media can co-exist

    • 10BaseT

    • 10Base2

    • 10Base5


Design rule 5 4 3 rule
Design Rule = 5-4-3 Rule

  • No more than 5 segments

  • Separated by no more than 4 repeaters

  • Coax – no more than 3 segments can have hosts

  • This rule prevents a 10 Mbps network from having propagation delay problems.


100 mbps ethernet fast ethernet
100 Mbps Ethernet (Fast Ethernet)

  • 100BaseTx – copper

  • 100BaseFx – fiber-multimode

  • Common characteristics

    • Timing parameters

    • Frame format

    • Parts of the transmission process


Timing parameters 100 mbps
Timing Parameters 100 Mbps

  • Bit time 10 nanoseconds

  • Slot time 512 bit-times

  • Interframe spacing 96 bits

  • Collision attempt limit 16

  • Collision back-off limit 10

  • Collision jam size 32 bits

  • Max. untagged frame size 1518 octets

  • Min. frame size 512 bits/64 octets


Repeater classes
Repeater Classes

  • Class I

    • Between one Ethernet media and another of the same speed

    • Any unlabeled repeater

  • Class II

    • Daisy-chaining is ok if cable length is less than 5 meters.

  • Repeaters cannot adapt between speeds.

  • Bridges connect Ethernet segments of differing speeds.


Link configuration
Link Configuration

  • Autonegotiate – preferable

  • Manual configuration is ok if autonegotiate fails.


1000 mbps ethernet
1000 Mbps Ethernet

  • 1000BaseT – Twisted pair

  • 1000Base-SX - short wave laser or LED on multimode

  • 1000BaseLX – long wave laser on single mode or multimode (recommended for Backbones)


1000 mbps parameters
1000-Mbps Parameters

  • Bit time 1 nanoseconds

  • Slot time 4096 bit-times

  • Interframe spacing 96 bits

  • Collision attempt limit 16

  • Collision back-off limit 10

  • Collision jam size 32 bits

  • Max. frame size 1518 octets

  • Min. frame size 512 bits/64 octets


Interoperability
Interoperability

  • Gigabit Ethernet

  • Fast Ethernet

  • 10BaseT

    • Bridge provides transfer from one speed to another

    • Important for office desktop applications

    • Wiring closets


Timing
Timing

  • Master clocking Mark time for

  • Slave clocking transmissions

  • Autonegotiate or manual configured for which device will act in which role.

  • Usually a multiport device handles the master role when autonegotiate determines.


1000basesx lx
1000BaseSX & LX

  • Fiber

  • Most often recommended for backbones

    • Group FastEthernet devices

    • Good noise immunity

    • No ground problems between floors/buildings

    • New device options

    • Excellent distance characteristics

    • Not susceptible to dc drift (bias) that causes clocking errors (same digit represented sequentially)

  • Not usually used for office desktop connections

    • Copper 10/100/1000 network interfaces are common

    • Copper is more “user proof”


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