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.
Chapter 2: NETWORK CABLING
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.
Chapter 2: NETWORK CABLING
A SIMPLE STAR TOPOLOGY
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Chapter 2: NETWORK CABLING
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.
Chapter 2: NETWORK CABLING
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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Chapter 2: NETWORK CABLING
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
1
Up to 0 MHz
Voice networks
2
Up to 1 MHz
Voice and low-speed data
networks less than 4
Mbps
3
Up to 16 MHz
Voice and data networks
from 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 Gigabit
Ethernet
6
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.

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