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TABLE 53 ITU-T Recommendations for Testing and Maintenance
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of SS7 Networks Maintenance strategy Protocol testing Protocol layer M4100 Q750 Q752 Level 1/2 Message Transfer Part (MTP 2) Level 3 Message Transfer Part (MTP 3) Level 4 Telephone User Part (TUP ISDN User Part (ISUP) Recommendation Q781 Q782 Q783 Q767
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Introduction to Telecommunications Network Measurements Introduction to Telecommunications Network Measurements 103
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in the SS7 network These hubs contain the routing tables for calls and also are the most likely sites of congestion under heavy traffic (McDowall 1994) 57 Centralized Control As discussed earlier in this chapter, the need to reduce operating costs and improve quality of service is driving network operators toward centralized maintenance and network management The benefits are twofold First, it allows skilled technical staff to be more productive as they can control maintenance and troubleshooting over a wider area Second, network monitoring can provide a realtime view of the state of the network, allowing the operator to assess quality of service and detect hot spots and system degradation, ideally before customers see a reduction in service quality At the first level it is possible to control test instrumentation remotely, so that measurements can be made by a skilled technician from a central site This is sometimes referred to as virtual remote operation using modern PCs or workstations; the front-panel operation of the remote instrument can be replicated and controlled from the display screen at the central site Increasingly the demand is for full network monitoring or operational support systems (OSSs), which provide real-time monitoring at hundreds or even thousands of test points across the whole network These computer-controlled systems can acquire measurement data either from system monitors built into the operational equipment, or by add-on measurement probes sited adjacent to network nodes
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571 Virtual remote capability
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The scope and power of all the transmission and protocol measurements discussed previously can be expanded by linking the test equipment into a control center (Figure 58) Individual instruments can be left to monitor network nodes When these instruments are connected sequentially to each transmission path, accumulated data can be transferred back to a central PC under command of the network operator Any time problems are reported, the instruments can be instructed to monitor particular channels continuously A remote testing development, one that takes advantage of PC/workstation hardware and software, is the so-called virtual remote capability Using the Microsoft Windows environment, lifelike representations of remote instrument front panels can be displayed on a centralized desktop computer, as shown in Figure 59 The instruments themselves communicate with the workstations via a simple data link By using the mouse, instrument function keys ( soft keys ) can be pressed on the workstation and the effect replicated at the remote instrument Measurement results displayed at the instrument are likewise relayed back to the workstation screen In current systems, communication and control is two-way If the engineer at the remote site operates the instrument and makes measurements, these actions are relayed back to the centralized control point This capability is different from conventional remote-control systems, which usually lock out local control
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Introduction to Telecommunications Network Measurements 104 Network Test and Measurement
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Figure 58 A simple remote test system in which a PDH frame analyzer is connected to many different test monitor points in a 140 Mbps transmission network via an access switch matrix The PC can scan all the test points sequentially looking for trouble, or can connect to a specific point for more detailed analysis and troubleshooting Via dial-up modem links, the PC can control geographically dispersed test sets, considerably increasing productivity of technical staff
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The power of the new generation of computers can be harnessed to make possible centralized measurements while requiring very little extra training; the operator is working with a user interface that looks and feels like the real instrument For network operators with scarce resources of expert, highly trained engineers, this option reduces time wasted on travel and spreads expertise over a larger number of sites Furthermore, the remote instruments can be used at any time as normal, portable field test sets just by disconnecting the data link
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