"excel barcode font" Mobile Service Level Classifications in Software

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TABLE 182 Mobile Service Level Classifications
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Class Level 3
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Type of Repair Component-level repair
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Function Performs full troubleshooting down to faulty components on circuit boards Can carry out a full calibration and test to the same specifications as the original manufacturer Performs testing (manual and automated) to trace fault to a replaceable module or circuit board Failures passed to Level 1 for repair Can perform some recalibration Automated testing that checks basic mobile performance Failures are passed to Level 2 or Level 3 for repairs
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Test Equipment Cellular test set (high functionality), spectrum analyzer,1 oscilloscope,1 digital voltmeter1
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Level 2
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Module-level repair
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Cellular test set (high functionality)
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Cellular test set (limited functionality)
1May
be included within the functionality of the cellular test set
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
Cellular Measurement Strategies Cellular Measurement Strategies 411
Figure 1810 Cellular phone modules Keyboard, battery, and antenna would be completely replaced if faulty The circuit boards usually are repaired down to the component level This might happen at the service shop if it is suitably equipped, or the circuit boards might be exchanged in a parts pipeline process with the manufacturer
surements performed on mobile RF modules are traceable in accuracy to the manufacturing process Manufacturers will use the full allowable spread of the specification when producing the mobiles This can lead to no-fault-found loops, where Level 3 repair shops and manufacturers waste time looking for nonexistent faults due to the fact that the Level 2 shop might have been testing with less accurate test equipment
Level 3 repair Level 3 service shops troubleshoot and repair mobiles down to the component level They use well-equipped cellular test sets with additional toolkit functions, such as spectrum analysis and RF signal generator capabilities, to diagnose almost any fault that could occur Traceability to the manufacturing process is often an issue in this type of repair; very often a reduced portion of the manufacturer s production test software is used to perform complex calibrations and checks on repaired mobiles when key components have been changed In Level 3 repair operations, after an initial visual inspection to identify obvious defects, the strategy is first to isolate the fault to a specific assembly Multichip boards such as digital control or RF assemblies will be repaired down to component level First the fault must be isolated to the transmitter or receiver section A cellular test set equipped with a spectrum analyzer and signal generator may be used to inject and trace signals along the RF paths An oscilloscope may be of use in checking out the digital portions of the circuitry In general, specific test points are identified and documented by the mobile manufacturer to aid and guide the repair technician Certain measurement results also are a good guide Low output power or poor modulation quality points to a transmitter problem Poor sensitivity points to a receiver problem After repair, an automated test of the key RF parameters and general functionality is performed to ensure that the mobile meets its specifications
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
Cellular Measurement Strategies 412 Cellular Networks
1852 Base station service testing
While a faulty mobile only affects a single user, a faulty base station can affect many users; network operators therefore are keen to avoid BS failures Cellular networks perform much continuous monitoring, with mobiles reporting received power level and modulation quality data back to the network control center, which gives a good indication of general network well-being Most operators perform some degree of routine maintenance testing to try to find faults before they occur Figure 1811 shows when RF testing is performed
In-service and out-of-service testing Table 183 shows the main characteristics of base station testing, which can be split into two types, in-service and out-of-service The main difference between the two is whether or not the link is made between the base station and its controller attached to the network Once a base station is connected to the network and commissioned, it is a problem to bring it out of service again because it means reducing the cellular coverage and potentially losing any established calls Troubleshooting and maintenance tend to use
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