LAN WIRINGH_CP2012.ppt

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NETWORK CABLINGChapter 2

Sourced from Internet-Vikramjeet Singh

CP2012


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Chapter 2: NETWORK CABLING 2

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 avoidreflection.

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 startopology.

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 thenetwork.

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 hubto 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 faulttolerance

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 GRADESCategory Frequency Primary Application

1 Up to 0 MHz Voice networks

2 Up to 1 MHz Voice and low-speed data

networks less than 4Mbps

3 Up to 16 MHz Voice and data networksfrom 4 to 100 Mbps

4 Up to 20 MHz 16-Mbps Token Ring

5 Up to 100 MHz 100-Mbps Fast Ethernet

5e Up to 100 MHz 1000-Mbps GigabitEthernet

6 Up to 250 MHz 1000-Mbps GigabitEthernet


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FIBER OPTIC CABLE


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STRAIGHT TIP ST) CONNECTOR


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STRAIGHT THROUGH AND CROSSOVERWIRING

Wiring within a twisted pair cable is configured aseither

Straight through, where each wire (or pin) is attachedto the same contact point at each end

Crossover, where transmit contacts on each end ofthe cable are connected to the receive contact at theother end

Ch 2 NETWORK CABLING 26


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STRAIGHT THROUGH WIRING

Ch t 2 NETWORK CABLING 27


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CROSSOVER WIRING

Ch t 2 NETWORK CABLING 28


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SUMMARY

The three basic LAN topologies are bus, star, andring. 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.

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