Microwave Radio Transmission Design Guide
A practical guide for engineers planning or building a microwave-based transmission system, with a special eye toward international standards.
TABLE OF CONTENTS Microwave Radio Transmission Design Guide
Chapter 3: Reliability (Quality) Standards
3.1 Introduction
This chapter on quality standards has purposely been included before detailed link design is discussed because it is not possible to design a link until one is clear what the design objectives are. Just getting a radio signal to be received at a distant point is not difficult; in fact, unwanted interference signals can be received from hundreds of miles away under certain propagation conditions. The science and engineering in designing a radio link goes into the predictions of the quality that can be expected from a given radio link design.
3.2 What Do I Aim For?
Network operators usually want their systems to operate error-free 100% of the time. For the systems planner this is impossible to achieve; and if the operator is pushed for a compromise, they will usually relax their requirement to the network being error-free and available "when they need it." This does not assist in designing a real network, so usually the planner turns to the standards provided by the United Nation's standardization body the ITU for guidance. The problem with these standards is that they are written for international circuits that may transverse many countries and be carried over many different transmission mediums. One really needs to understand what they are trying to achieve in order to apply them sensibly. This section is intended to provide some practical guidance in order to be able to apply these standards to meet reasonable quality standards set by the operator. Since this is a book about...
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