Transmission systems

Transmission systems

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This chapter describes the wide variety of transmission systems used in telecommunication networks today. In doing this, we will be drawing upon the concepts of multiplexing and analogue-to-digital (A/D) conversion introduced in the previous chapter. Earlier chapters have also introduced the important distinction between the Access Network, which serves the subscribers, and the Core Transmission Network, which provides links between network nodes only. In general, the transmission systems described in this chapter may be deployed in both the Access and the Core Transmission Networks - although they are usually more appropriate to one or the others, and this will be indicated. The previous chapter introduced the model of the networks associated with the public switched telephone network (PSTN), in which the Access and Core Transmission Networks act as a common utility for providing circuits to the various specialised networks as well as the PSTN. However, we will leave the description of how the various transmission systems are deployed in the Access and Core Transmission Networks.

Chapter Contents:

  • 4.1 Introduction
  • 4.2 Transmission bearers
  • 4.2.1 Transmission principles
  • 4.2.2 Transmission media
  • Copper pair cable
  • Optical fibre cable
  • Coaxial cable
  • Atmosphere: radio
  • Free space: Earth satellites
  • 4.3 Multiplexed payloads
  • 4.3.1 The pulse-code modulation multiplexed payload: the basic building block of digital networks
  • 30-Channel pulse-code modulation multiplex
  • 24-Channel pulse-code modulation multiplex (USA DS1)
  • 4.3.2 The time-division multiplexing of digital blocks
  • 4.3.3 Plesiochronous digital hierarchy system
  • 4.3.4 SONET and synchronous digital hierarchy system
  • 4.4 The range of transmission systems
  • 4.4.1 Metallic-line systems
  • 4.4.2 Digital subscriber line transmission systems
  • Asymmetrical digital subscriber line system
  • High-bit-rate digital subscriber line system
  • Symmetric digital subscriber line system
  • Very high-bit-rate digital subscriber line system
  • ADSL2 and VDSL2
  • 4.4.3 Point-to-point optical fibre
  • 4.4.4 Dense wave-division multiplex system
  • 4.4.5 Passive optical fibre network
  • 4.4.6 Ethernet fibre to the premises
  • 4.4.7 Dark fibre
  • 4.4.8 Submarine cable systems
  • 4.4.9 Line-of-sight microwave radio systems
  • 4.4.10 Earth satellite systems
  • 4.4.11 Wireless local area networks
  • 4.4.12 Wireless metropolitan area networks
  • 4.5 Summary
  • References

Inspec keywords: multiplexing; subscriber loops; analogue-digital conversion

Other keywords: access-core transmission networks; analogue-to-digital conversion; multiplexing concept; telecommunication networks; public switched telephone network; PSTN

Subjects: Subscriber loops; A/D and D/A convertors; Communication switching

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