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Introduction to Cable Communications Systems
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belt and climber An underground plant can be direct buried where soil conditions permit or placed in pipe or conduit It requires chain trenchers or back hoes to open a trench for conduit installation or direct burial cables Special earth plows have been developed that permit faster and more economical underground cable installation Regulation of cable systems installed on the public highways quickly came about as the industry developed The FCC as well as individual states have laws with rules and regulations that the cable system industry has to follow As cable systems improved so did the consumer electronics industry with improved and larger television receivers The greatest improvement was color television The cable system has responded with more and better television programming to the viewing public
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Questions
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1 List the problems associated with over-the-air television reception using an outside antenna 2 What do the letters CATV stand for 3 Describe what is known as cable loss 4 What did early cable systems do to carry the UHF channels 5 What was the greatest improvement in coaxial cable 6 Name the most signi cant improvement in cable system ampli ers 7 List the main improvements in early cable systems 8 Explain how lightning may affect a cable plant 9 What two types of lightning protective devices are used in cable systems 10 Explain how temperature or thermal problems are controlled in cable ampli ers 11 Describe what is meant by the unity gain building block 12 What is the unit of measure for signal level in cable communication systems 13 What cable parameter is most important for a cable power system 14 Which cable type has the least loss, a large diameter cable or a small diameter type 15 Name the advantages of jacketed cable
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16 Why are cable connectors so critical to a cable communication system 17 What dictates whether a cable plant is aerial or underground 18 Name the main or principal concern for cable plant construction 19 List some of the advantages of cable plowing over trenching for underground cable plant 20 List some of the problems associated with cable plowing over trenching
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Problems
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Answers to odd-numbered problems appear in Appendix F 1 For an impedance-matched system (for example, Rin Rout ), calculate the dB loss if the output voltage is 2 mV and the input is 200 mV 2 Calculate the dBmV level for a voltage of 200 mV 3 For a length of cable, if the input signal level is 3 dBmV and the output signal level is 23 dBmV, calculate the cable loss 4 For the unity gain building block consisting of a length of cable followed by an ampli er, if the input signal level to the length of cable is 7 dBmV, what will the ampli er output level be 5 For the cable circuit in problem 4, what gain will the ampli er need if the cable loss is 20 dB 6 Calculate the dBmV signal level for a voltage of 1 volt
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Coaxial Cable Systems and Networks
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2
Objectives
After learning the material in this chapter, the student will be able to
Describe the coaxial cable networks that distribute programming to subscribers Explain the bidirectional, or two-way, capabilities of a coaxial cable distribution system Describe the operation and features of the electronic ampli ers Explain the method of cable powering the ampli er cascade Understand the various construction methods for both aerial and underground plant Describe the methods used for protection and security of television programming Understand the system testing and the necessary records and maintenance procedures
21 Introduction
The basic idea of the cable television system was that the central antenna system would be shared among connected subscribers willing to pay a monthly fee The headend, as it is still known, was the source of the signals making up the basic service The headend was usually located on a hilltop, tall building, water tank, or steel tower located out of town, away from subscriber homes The basic off-air received television signals were ampli ed, ltered, adjusted in level, and combined and delivered by the cable ampli er cascade to subscribers This elementary topology was known as the tree-branch cable system The main cable was the trunk system from the headend to the town where the cable branched down the streets to the subscribers homes
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