Transcript NETWORK CABLING

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Chapter 2
NETWORK CABLING
Chapter 2: NETWORK CABLING
TOPOLOGIES
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There are three main local area network (LAN)
topologies:
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Bus
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Star
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Ring
Other network topologies include:
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Mesh

Wireless
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BUS TOPOLOGY
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The bus topology supports thick and thin coaxial segments.
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Segments are connected by repeaters.
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The bus topology uses the baseband signaling method.
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Signals are broadcast in both directions simultaneously.
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Both ends of each segment require termination to avoid
reflection.
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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
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The star topology can use coaxial, twisted pair, or fiber
optic cable.
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A central device (hub) connects hubs and nodes to the
network.
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Each node connects to its own dedicated port on the hub.
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Hubs broadcast transmitted signals to all connected devices.
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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
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The ring topology can use twisted pair or fiber optic cabling.
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A central device (hub) connects hubs and nodes to the
network.
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Each node connects to its own dedicated port on the hub.
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You can connect multiple hubs to form a larger ring.
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The ring topology uses the baseband signaling method.
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Frames are transmitted around the ring from node to hub
to node.
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Media Access Control (MAC) is used for token passing.
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A RING NETWORK
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MESH TOPOLOGY
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Typically uses fiber optic cabling for redundant
wide area network (WAN) links
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Provides multiple paths to destinations for fault
tolerance
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Supports baseband and broadband signals
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Requires an enormous amount of cable
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LAN MESH
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ENTERPRISE MESH
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WIRELESS TOPOLOGY
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Cell-based technology that uses unbounded media
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Two wireless topologies:
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Ad hoc
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Infrastructure
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AD HOC WLAN
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INFRASTRUCTURE WLAN
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LAN CABLE TYPES
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Three cable types are used in LANs:
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Coaxial
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Twisted pair
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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
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The three basic LAN topologies are bus, star, and
ring. WLANs are becoming more popular. Mesh
networks are not typically used in LANs.
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The primary cable types used in LANs are coaxial,
twisted pair, and fiber optic.