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Transmission Media. Rong Wang CGS3285 Spring 2004. From textbooks: Chapter 7 of Data Communications and Networking, 3rd Edition, Behrouz A. Forouzan (ISBN: 0-07-251584-8) . Recommended Reading. Figure 7.1 Transmission medium and physical layer. Figure 7.2 Classes of transmission media.

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rong wang cgs3285 spring 2004


Rong Wang


Spring 2004

recommended reading
From textbooks:

Chapter 7 of Data Communications and Networking, 3rd Edition, Behrouz A. Forouzan (ISBN: 0-07-251584-8)

Recommended Reading

7.1 Guided Media

Twisted-Pair Cable

Coaxial Cable

Fiber-Optic Cable

twisted pair
Twisted Pair
  • Consists of two insulated copper wires: one for carrying signal the other for ground reference
  • Twisted together to decrease the crosstalk interference between adjacent pairs in a cable
unshielded versus shielded twisted pair cable
Unshielded versus Shielded Twisted-Pair Cable
  • Unshielded Twisted-Pair (UTP)
    • Most commonly used
    • Cheaper than STP
  • Shielded Twisted-Pair Cable (STP)
    • Has a metal foil or braided-mesh covering that encases each pair of insulated conductors
    • Bulkier and more expensive
twisted pair transmission characteristics

Amplifiers every 5km to 6km


Use either analog or digital signals

repeater every 2km or 3km

Limited distance

Limited bandwidth (1MHz)

Limited data rate (100Mbps)

Susceptible to interference and noise

TWISTED PAIR – Transmission Characteristics
twisted pair applications
Most common medium

Often used in buildings for LAN and PBX station connections

Also used in telco outside plant (local loops)

For local area networks (LAN)

10Mbps or 100Mbps

Can carry both voice and data

TWISTED PAIR - Applications

Figure 7.8BNC connectors

  • Terminator is used to prevent the reflection
transmission characteristics

Amplifiers every few km

Closer if higher frequency

Up to 500MHz


Repeater every 1km

Closer for higher data rates

Less susceptible to interference and crosstalk than twisted pair

Transmission Characteristics
Most versatile medium

Television distribution

Ariel to TV

Cable TV

Long distance telephone transmission

Can carry 10,000 voice calls simultaneously

Being replaced by fiber optic

Short distance computer systems links

Local area networks

advantages and disadvantages

Higher bandwidth

Less signal attenuation

Less interference

Resistance to corrosive materials

Light weight

More immune to tapping


Expensive to install

Advantages and disadvantages
Long-haul trunks

Metropolitan trunks

Rural exchange trunks

Subscriber loops



Backbone networks

TV distribution