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CCTV Digital Basics
10.16.03 / Internal
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Objectives
Department
Identify the different network transmission options
Describe the characteristics of the different transmission methods
Identify transmission limits for different medium
Unit 5 – Network Transmission Medium
10.16.03 / Internal
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Department
Network cabling terminology
Ethernet
Widely used set of protocols for LAN systems that allows for a diverse variety of cable types
Ethernet cabling is specified by bandwidth, carrying distance or specifications, and material type
10.16.03 / Internal
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Department
Ethernet cable types
10Base5
10BaseF
100BaseTX
100Base FX
100 Mbps
1000BaseT
1000BaseLX
1000BaseSX
10.16.03 / Internal
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Department
Twisted pair cabling
Usual Application
CAT 2
4 Mbps
CAT 3
CAT 5
100 Mbps - 1000 Mbps (4 pair) 100 MHz
100 Mbps TPDDI, 155 Mbps ATM No longer supported, replaced by 5E
CAT 5E
Gigabit Ethernet, better near-end cross talk resistance then CAT 5
CAT 6
250 MHz
Super fast broadband applications, Most popular cabling for new installs
CAT 6E
CAT 7
600 MHz
Full motion video. Govt. and mfg. environments, shielded cable systems.
10.16.03 / Internal
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Department
Fiber Optic
Immune to electromagnetic and radio frequency interference, and power surges
Large bandwidth transmission capabilities
Long distance carrying capabilities
Light is channeled in either single mode or multimode cabling
10.16.03 / Internal
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Department
Fiber Optic
Dispersion
Light traveling in a straight line covers less distance than light traveling in a bouncing path
The time difference multiple light beams reach a point is called Dispersion
The type of glass and the surrounding cladding can impact and help control the amount of light dispersion
Dispersion
10.16.03 / Internal
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Department
Fiber Optic
Preferred application for long distances and high bandwidth
10.16.03 / Internal
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Department
Fiber Optic
Multimode cable
Larger diameter glass core (50 – 80 microns)
Step-index multimode cable – has abrupt change between glass core and surrounding cladding
Bandwidth limits ~ 50 Mbps
Graded-index multimode cable – has gradual change between glass core and surrounding cladding. This allow the bouncing light to travel faster than the middle light beam(s), reducing dispersion
Bandwidth limits ~ 1 Gbps
10.16.03 / Internal
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Department
Repeaters
Allows for longer transmission distances than the cable limits allow
Receives the digital signal, removes unwanted noise and regenerates the signal
Digital electrical pulses uses on/off voltages
Digital fiber optic uses amplified light pulses
10.16.03 / Internal
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Department
Repeaters
10.16.03 / Internal
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Answer the review questions
10.16.03 / Internal
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Unit 1 – Defining Digital