南邮IP双语.ppt

Outline
Nodes & Links ()
Encoding ()
Framing ()
Error Detection ()
Reliable Transmission ()
MAC (-8)
Point-to-Point Links
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Nodes & Links
Nodes
PC, Routers, Swiches
Links
Conducted Media
Twisted Pair
Coaxial Cable
Optical Fiber (Table )
Wireless Media
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Characteristics and quality determined by medium( immunity to interference, bit rate, distance, frequency, signal etc.)
For guided, the medium is more important
For unguided, the bandwidth produced by the antenna is more important
Key concerns are data rate, distance and cost
Transmission Media
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Twisted Pair - Applications
mon medium
work
Between house and local exchange (subscriber loop)
Within buildings
To private branch exchange (PBX)
For local works (LAN)
10Mbps or 100Mbps
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Twisted Pair - Pros and Cons
Cheap
Easy to work with
Low data rate
Short range
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Twisted Pair - Transmission Characteristics
Analog
Amplifiers every 5km to 6km
Digital
Use either analog or digital signals
repeater every 2km or 3km
Limited distance
Limited bandwidth (1M)
Limited data rate (100M)
Susceptible to interference and noise
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Unshielded and Shielded TP
Unshielded Twisted Pair (UTP)
Ordinary telephone wire
Cheapest
Easiest to install
Suffers from external EM interference
Shielded Twisted Pair (STP)
Metal braid or sheathing that reduces interference
More expensive
Harder to handle (thick, heavy)
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Coaxial Cable
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Coaxial Cable Applications
Most versatile medium
Television distribution
Cable TV
Long distance telephone transmission
Can carry 10,000 voice calls simultaneously
Being replaced by fiber optic/UTP
Short pu