Transcript งานนำเสนอ PowerPoint - Chiang Mai University

CISCO NETWORKING ACADEMY PROGRAM (CNAP)
SEMESTER 1/ MODULE 7
Ethernet Technologies
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CISCO NETWORKING ACADEMY PROGRAM
SEMESTER 1/ MODULE 7
Ethernet Fundamentals
Objectives
• Upon completion of this module, students will be able to perform
tasks related to the following:
• 10-Mbps and 100-Mbps Ethernet
• Gigabit and 10-Gigabit Ethernet
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CISCO NETWORKING ACADEMY PROGRAM
SEMESTER 1/ MODULE 7
Ethernet Technologies
Types of Ethernet
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CISCO NETWORKING ACADEMY PROGRAM
SEMESTER 1/ MODULE 7
Ethernet Technologies
10-Mbps Ethernet
• 10BASE5, 10BASE2, and 10BASE-T all share the same timing parameters, as
shown below
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CISCO NETWORKING ACADEMY PROGRAM
SEMESTER 1/ MODULE 7
Ethernet Technologies
10-Mbps Ethernet
• The encoding technique
used in 10-Mbps Ethernet
is called “Manchester”
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CISCO NETWORKING ACADEMY PROGRAM
SEMESTER 1/ MODULE 7
Ethernet Technologies
10BASE5
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10BASE5 transmitted 10 Mbps over a single thick coaxial cable bus
Each of the maximum five segments of thick coax may be up to 500 m (1640.4 ft) in length
10BASE5 only runs in half-duplex resulting in a maximum of 10 Mbps of data transfer
Figure shown below illustrates one possible configuration for a maximum end-to-end collision
domain
• Between any two distant stations only three repeated segments are permitted to have stations
connected to them
• with the other two repeated segments used only as link segments to extend the network.
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CISCO NETWORKING ACADEMY PROGRAM
SEMESTER 1/ MODULE 7
Ethernet Technologies
10BASE2
• 10BASE2 transmitted 10 Mbps over a single thin coaxial cable bus
• Each of the maximum five segments of thick coax may be up to 185 m in length
• 10BASE2 only runs in half-duplex resulting in a maximum of 10 Mbps of data
transfer
• There may be up to 30 stations on any individual 10BASE2 segment
• Out of the five consecutive segments in series between any two distant
stations
• Only three may have stations attached
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CISCO NETWORKING ACADEMY PROGRAM
SEMESTER 1/ MODULE 7
Ethernet Technologies
10BASE2
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CISCO NETWORKING ACADEMY PROGRAM
SEMESTER 1/ MODULE 7
Ethernet Technologies
10BASE-T
• 10BASE-T used Category 3 unshielded twisted pair (UTP) copper but recommended that any new
cable installations be made with Category 5e or better
• A 10BASE-T UTP cable has a solid conductor for each wire in the maximum 90 meter horizontal
cable
• Originally 10BASE-T was a half-duplex protocol, but full-duplex features were added later
• 10BASE-T carries 10 Mbps of traffic in half-duplex mode and 20 Mbps in full-duplex mode
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CISCO NETWORKING ACADEMY PROGRAM
SEMESTER 1/ MODULE 7
Ethernet Technologies
10BASE-T Wiring & Architecture
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CISCO NETWORKING ACADEMY PROGRAM
SEMESTER 1/ MODULE 7
Ethernet Technologies
100-Mbps Ethernet
• 100-Mbps Ethernet is also known as Fast Ethernet or IEEE 802.3u
• The two technologies that have become important are:
• 100BASE-TX, which is a copper UTP medium
• 100BASE-FX, which is a multimode optical fiber medium
• Two separate encoding steps are used by 100-Mbps Ethernet
• The first part of the encoding uses a technique called 4B/5B
• the second part of the encoding is the actual line encoding specific to copper or fiber
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CISCO NETWORKING ACADEMY PROGRAM
SEMESTER 1/ MODULE 7
Ethernet Technologies
100BASE-TX
• 100BASE-TX using Cat 5 UTP cable
• 100BASE-TX uses 4B/5B encoding, which is then scrambled and converted to multi-level transmit-3
levels or MLT-3
• 100BASE-TX carries 100 Mbps of traffic in
half-duplex mode.
• In full-duplex mode, 100BASE-TX can
exchange 200 Mbps of traffic
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CISCO NETWORKING ACADEMY PROGRAM
SEMESTER 1/ MODULE 7
Ethernet Technologies
100BASE-FX
• 100BASE-TX using Fiber Optic cable
• 100BASE-FX also uses 4B/5B encoding which called
NRZI (Nonreturn to Zero Inverted) encoding
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CISCO NETWORKING ACADEMY PROGRAM
SEMESTER 1/ MODULE 7
Ethernet Technologies
Fast Ethernet Architecture
• Fast Ethernet links generally consist of a connection between a station and a hub or switch
• A Class I repeater may introduce up to 140 bit-times of latency and is any repeater that
changes between one Ethernet implementation and another
• A Class II repeater
may only introduce
a maximum of 92
bit-times latency
• Because of the
reduced latency it is
possible to have two
Class II repeaters in
series
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CISCO NETWORKING ACADEMY PROGRAM
SEMESTER 1/ MODULE 7
Ethernet Technologies
1000-Mbps Ethernet
• The 1000-Mbps Ethernet, Gigabit Ethernet or IEEE 802..3z standards represent
transmission using both fiber and copper media
• Fiber-based Gigabit Ethernet (1000BASE-X) uses 8B/10B encoding which is similar to
the 4B/5B concept
• 1000BASE-TX, 1000BASE-SX, and 1000BASE-LX use the same timing parameters, as
shown below
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CISCO NETWORKING ACADEMY PROGRAM
SEMESTER 1/ MODULE 7
Ethernet Technologies
1000BASE-T
• 1000BASE-T use all four pairs of wires (must meet the higher quality Category 5e or ISO
Class D (2000) requirements)
• The 1000BASE-T encoding with 4D-PAM5 (4-Dimensional 5 level Pulse Amplitude
Modulation) line encoding
• In idle periods there are 9 voltage levels found on the cable, and during data transmission
periods there are 17 voltage levels found on the cable
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CISCO NETWORKING ACADEMY PROGRAM
SEMESTER 1/ MODULE 7
Ethernet Technologies
1000BASE-SX & LX
• 1000BASE-X uses 8B/10B encoding converted to non-return to zero (NRZ) line encoding
• The NRZ signals are then pulsed into the fiber using either short-wavelength or long-wavelength
light sources:
• The short-wavelength
uses an 850 nm laser or
LED source in
multimode optical fiber
(1000BASE-SX)
• The long-wavelength
1310 nm laser source
uses either single-mode
or multimode optical
fiber (1000BASELX)Laser sources used
with single-mode fiber
can achieve distances of
up to 5000 meters
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CISCO NETWORKING ACADEMY PROGRAM
SEMESTER 1/ MODULE 7
Ethernet Technologies
Gigabit Ethernet Architecture
• 1000BASE-SX
• 1000BASE-LX
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CISCO NETWORKING ACADEMY PROGRAM
SEMESTER 1/ MODULE 7
Ethernet Technologies
10-Gbps Ethernet
• IEEE 802.3ae was adapted to include 10 Gbps full-duplex transmission over fiber
optic cable
• As is typical for new technologies, a variety of implementations are being
considered, including:
• 10GBASE-SR – Intended for short distances over already-installed
multimode fiber, supports a range between 26 m to 82 m
• 10GBASE-LX4 – Uses wavelength division multiplexing (WDM), supports
240 m to 300 m over already-installed multimode fiber and 10 km over
single-mode fiber
• 10GBASE-LR and 10GBASE-ER – Support 10 km and 40 km over singlemode fiber
• 10GBASE-SW, 10GBASE-LW, and 10GBASE-EW – Known collectively
as 10GBASE-W are intended to work with OC-192 synchronous transport
module (STM) SONET/SDH WAN equipment
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CISCO NETWORKING ACADEMY PROGRAM
SEMESTER 1/ MODULE 7
Ethernet Technologies
10-Gbps Ethernet
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CISCO NETWORKING ACADEMY PROGRAM
SEMESTER 1/ MODULE 7
Ethernet Technologies
10-Gbps Ethernet Implementations
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