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Testing in the Life Cycle of a Network 90 Network Test and Measurement
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ATSC Australian Telecommunications Standardization Committee http://wwwstandardscomau/~sicsaa CTIA Cellular Telecommunications Industry Association (USA) http://wwwwow-comcom DAVIC Digital Audio Video Council (Geneva) http:/wwwdavicorg DVB Digital Video Broadcasting http:/wwwdvborg ETSI European Telecommunications Standards Institute (France) http://wwwetsifr IEEE Institute of Electrical and Electronic Engineers (New York) http://wwwstdsbbsieeeorg IETF Internet Engineering Task Force (Reston, Va) http://wwwietforg ITU International Telecommunications Union (Geneva) http://wwwituch (links to ITU-T and ITU-R) RCR R&D Center for Radio Systems (Japan) http://wwwphsmouorjp TIA Telecommunications Industry Association (USA) http://wwwindustrynet/tia TSACC Telecommunications Standards Advisory Council of Canada http://wwwtsaccicgcca
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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Source: Communications Network Test and Measurement Handbook
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Introduction to Telecommunications Network Measurements
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Introduction Network technology is changing at an increasing rate In the past, major investments in transmission and switching technology took many years to depreciate Today, however, the pressures of the market and the advances in technology demand more rapid turnover The unrelenting rollout of new technology creates challenges for new test equipment and maintenance strategies The business climate in telecommunications is changing, too Because of competition and deregulation, combined with the increasing importance of telecommunications for business activities, network operators are becoming more service- and customer-focused Network performance is measured in terms of quality of service (QoS) Successful delivery is measured by the highest quality at the lowest prices Network operators also need to bring new technology into service very quickly to create competitive advantage
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Quality of Service Network quality of service (QoS) can be characterized by five basic performance measures: 1 Network availability (low downtime) 2 Error performance 3 Lost calls or transmissions due to network congestion 4 Connection setup time 5 Speed of fault detection and correction
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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Introduction to Telecommunications Network Measurements 92 Network Test and Measurement
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Network availability and error performance are usually the parameters that service providers guarantee in terms of QoS Generally these parameters need to be checked while the network is in service (ie, carrying traffic), using a network management system Lost calls and call setup time are the main criteria for measuring performance in switched networks, often indicating whether network planning is keeping up with traffic growth and changing traffic types The move to common-channel signaling has greatly reduced call setup time, while also increasing system flexibility for offering new services The growth of Internet traffic, however, with long holding times on the circuit-switched network, has again called into question network performance Some network operators now guarantee that they will fix faults within a specified time or pay compensation to the customer This requires good processes for troubleshooting, well-trained technicians with access to powerful test equipment, and probably the use of centralized automatic test systems for rapid fault finding 53 Testing Objectives An initial reaction to network testing might be that it is something to be avoided if possible because it costs time and money On reflection, however, effective testing can add value rather than being an expense, and can enhance the network operator s business There are three major business problems that are driving operators today: 1 Time-to-market of new products and services 2 Reducing the cost of delivering a service 3 Improving and guaranteeing service quality One could add a fourth consideration: the need for reassurance about the security of the network and the ability to detect problems before customers find them No unpleasant and embarrassing surprises In a volatile and rapidly changing market, it can be just as challenging to retain existing customers as to find new ones Thus testing is at the heart of this new business environment Unless one has good measurements of QoS, one cannot assess competitive strength or make significant improvements As discussed later in this chapter, monitoring the traffic on the network yields not only QoS measures but also can provide a useful source of additional information on the business, such as market information and costs Network testing can be divided into three application areas: 1 Bringing new equipment and systems into service 2 Troubleshooting and detecting network degradation 3 Monitoring and ensuring quality of service
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