T 3.7 Failure of the PBX due to operating errors

Apart from technical failure due to defective components, power failure or sabotage, there are various other factors which may result in the breakdown of a PBX. For instance, insufficiently trained maintenance staff may modify the configuration of the system which could result in such a failure. The same effect can occur if alarm signals or abnormal operating performance are not recognised in time, or when generally simple routine repairs are carried out improperly or rashly.