NETWORK CABLING
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Transcript NETWORK CABLING
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Chapter 2
NETWORK CABLING
Chapter 2: NETWORK CABLING
TOPOLOGIES
There are three main local area network (LAN)
topologies:
Bus
Star
Ring
Other network topologies include:
Mesh
Wireless
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BUS TOPOLOGY
The bus topology supports thick and thin coaxial segments.
Segments are connected by repeaters.
The bus topology uses the baseband signaling method.
Signals are broadcast in both directions simultaneously.
Both ends of each segment require termination to avoid
reflection.
End systems connect to the segment in a linear manner.
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THICK AND THIN COAXIAL BUS
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STAR TOPOLOGY
The star topology can use coaxial, twisted pair, or fiber
optic cable.
A central device (hub) connects hubs and nodes to the
network.
Each node connects to its own dedicated port on the hub.
Hubs broadcast transmitted signals to all connected devices.
You can connect multiple hubs to form a hierarchical star
topology.
The star topology uses the baseband signaling method.
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A SIMPLE STAR TOPOLOGY
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A HIERARCHICAL STAR TOPOLOGY
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RING TOPOLOGY
The ring topology can use twisted pair or fiber optic cabling.
A central device (hub) connects hubs and nodes to the
network.
Each node connects to its own dedicated port on the hub.
You can connect multiple hubs to form a larger ring.
The ring topology uses the baseband signaling method.
Frames are transmitted around the ring from node to hub
to node.
Media Access Control (MAC) is used for token passing.
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A RING NETWORK
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MESH TOPOLOGY
Typically uses fiber optic cabling for redundant
wide area network (WAN) links
Provides multiple paths to destinations for fault
tolerance
Supports baseband and broadband signals
Requires an enormous amount of cable
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LAN MESH
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ENTERPRISE MESH
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WIRELESS TOPOLOGY
Cell-based technology that uses unbounded media
Two wireless topologies:
Ad hoc
Infrastructure
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AD HOC WLAN
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INFRASTRUCTURE WLAN
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LAN CABLE TYPES
Three cable types are used in LANs:
Coaxial
Twisted pair
Fiber optic
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COAXIAL CABLE
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AUI (ATTACHMENT UNIT INTERFACE) CABLE
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THIN ETHERNET HARDWARE
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UNSHIELDED TWISTED PAIR (UTP) CABLE
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UTP CONNECTORS
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UTP CABLE GRADES
Category
Frequency
Primary Application
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Up to 0 MHz
Voice networks
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Up to 1 MHz
Voice and low-speed data
networks less than 4
Mbps
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Up to 16 MHz
Voice and data networks
from 4 to 100 Mbps
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Up to 20 MHz
16-Mbps Token Ring
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Up to 100 MHz
100-Mbps Fast Ethernet
5e
Up to 100 MHz
1000-Mbps Gigabit
Ethernet
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Up to 250 MHz
1000-Mbps Gigabit
Ethernet
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FIBER OPTIC CABLE
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STRAIGHT TIP (ST) CONNECTOR
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STRAIGHT THROUGH AND CROSSOVER
WIRING
Wiring within a twisted pair cable is configured as
either
Straight through, where each wire (or pin) is attached
to the same contact point at each end
Crossover, where transmit contacts on each end of
the cable are connected to the receive contact at the
other end
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STRAIGHT THROUGH WIRING
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CROSSOVER WIRING
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SUMMARY
The three basic LAN topologies are bus, star, and
ring. WLANs are becoming more popular. Mesh
networks are not typically used in LANs.
The primary cable types used in LANs are coaxial,
twisted pair, and fiber optic.