Analysis of fault type and the switch – switch failures, network equipment – off
Switch operation failure is inevitable, but, after failure should be handled quickly, as soon as possible to identify the point of failure, troubleshooting, this is the responsibility of the maintenance personnel. But to do this, we must understand the type of switch failure, and with the fault analysis and processing capabilities. To this end, this switch often occurs on the fault type and analysis method of dealing with a brief introduction.
1 fault classification PBX maintenance over the years from the author's experience and failures encountered in the work of view, the switch is generally divided into the following types of fault, as shown in Table 1.
Specific types are: (1) Circuit board damage Circuit board components damaged or poor substrate, causing the circuit board does not work.
(2) Hardware Engineering Notes inappropriate Hardware Engineering Note is to reduce the types of circuit boards, circuit board set in a group or groups of switches, circuit board to define the work of state or location in the system, such as hardware Note workers Setting incorrectly, will cause the board not working properly.
(3) inappropriate types of circuit plate
Hardware update, the same name of the circuit blocks may have a variety of different models. Under normal circumstances, the new models will be compatible with the functions of the circuit board circuit board features the older models, but older models may not necessarily function of the circuit board is compatible with the new model features a circuit board.
(4) chassis, the module issues Chassis, the module used to carry circuit board, its position in the system is divided into a rack processor systems, modules, switching system rack, modules and maintenance Management System rack module. The chassis, the module will fail.
(5) equipment supply problems Rectifier provides-48V DC is assigned to each rack and related equipment on the rack Power supply Responsible for power distribution system modules, and each module's power supply circuit board, all within the module circuit board according to the voltage required to adjust, and then delivered to each piece of board. But in the process, any link problems may have resulted in power failure.
(6) to connect jumper cables and patch panel problems
Jumper connecting cables and patch panels are used to connect modules, racks and equipment, if these connecting cables within the cable core or jumper occurred short circuit, open circuit or virtual access, it will form Communicate System failure.
(7) procedures BUG Software design shortcomings. (8) System data error System data, including software work note for the definition of the whole system. If the system data errors, can also cause system wide failure, affect the entire exchange bureau.
(9) Bureau data errors Bureau data are based on the specific circumstances of the exchange bureau defined. When an error occurs the data will impact the entire exchange bureaux.
(10) user data error User data for each user to define the situation, if the user data is error settings, user data error occurs, a user will have an impact.
2 failure analysis and processing methods
Different faults have different forms, failure analysis is aimed at the phenomenon through the analysis of failure to identify the causes and determine the location of faults in order to rule out the faults. To make an orderly and rule-based fault analysis, fault analysis requires reference to the level of fault classification, step by step. First, according to a classification, to determine fault or hardware failure in the software, and then secondary and tertiary classification recurrence. Fifth grade category has a lot of testing methods, some commonly used test methods are:
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