A method for verifying a port synchronisation for DSL lines, comprising the following steps executed by a system: - the port is configured for measurement and information about inactive emergency profiles, that allow to achieve the synchronisation on the line in the case when the standard settings dedicated to provide services do not allow to achieve the synchronisation, is recorded in the system - then there is read at least one of such parameters as: - the number of synchronisation attempts and - the number of failed synchronisation attempts; - the time of readings of these parameters is recorded in a memory; - so as to determine absence of synchronisation, the values of administrative status, that allow management of resources, and operational status of the port, that indicate if the subscriber line is operating are successively read through the system; - then value of administrative status and the operational status are checked - in the event in which administrative status and the operational status are not both "UP" current time is measured and it is checked whether a difference between the current time and the time measured at the step of reading is smaller than a predefined threshold; and - if the difference exceeds the predefined threshold, then a parameter of synchronisation attempts pre-selected in step of reading is re-read and information about absence of synchronisation is transmitted to a unit that issues measurement requests, - then the read values of parameters from step of reading and step of re-reading associated with the numbers of synchronisation attempts at different times are compared, - the information about the synchronisation attempts on the port is transmitted along with instructions to the unit that issues measurement requests, and - it is checked whether the emergency profile is activated on the port, where: - in the event of a negative result of checking the state of activation of the emergency profile, the emergency profile is activated and the information about activation of the emergency profile is recorded in the system, and the system returns to the step of reading of the previously selected parameter of the synchronisation attempts and successively repeats the previous steps, - in the event of a positive result of checking the state of activation of the emergency profile, to the unit that issues measurement requests, along with instructions, there is transmitted the information about the absence of the synchronisation in the emergency profile. - the port is configured for measurement and information about inactive emergency profiles, that allow to achieve the synchronisation on the line in the case when the standard settings dedicated to provide services do not allow to achieve the synchronisation, is recorded in the system - then there is read at least one of such parameters as: - the number of synchronisation attempts and - the number of failed synchronisation attempts; - the number of synchronisation attempts and - the number of failed synchronisation attempts; - the time of readings of these parameters is recorded in a memory; - so as to determine absence of synchronisation, the values of administrative status, that allow management of resources, and operational status of the port, that indicate if the subscriber line is operating are successively read through the system; - then value of administrative status and the operational status are checked - in the event in which administrative status and the operational status are not both "UP" current time is measured and it is checked whether a difference between the current time and the time measured at the step of reading is smaller than a predefined threshold; and - if the difference exceeds the predefined threshold, then a parameter of synchronisation attempts pre-selected in step of reading is re-read and information about absence of synchronisation is transmitted to a unit that issues measurement requests, - then the read values of parameters from step of reading and step of re-reading associated with the numbers of synchronisation attempts at different times are compared, - the information about the synchronisation attempts on the port is transmitted along with instructions to the unit that issues measurement requests, and - it is checked whether the emergency profile is activated on the port, where: - in the event of a negative result of checking the state of activation of the emergency profile, the emergency profile is activated and the information about activation of the emergency profile is recorded in the system, and the system returns to the step of reading of the previously selected parameter of the synchronisation attempts and successively repeats the previous steps, - in the event of a positive result of checking the state of activation of the emergency profile, to the unit that issues measurement requests, along with instructions, there is transmitted the information about the absence of the synchronisation in the emergency profile. - in the event of a negative result of checking the state of activation of the emergency profile, the emergency profile is activated and the information about activation of the emergency profile is recorded in the system, and the system returns to the step of reading of the previously selected parameter of the synchronisation attempts and successively repeats the previous steps, - in the event of a positive result of checking the state of activation of the emergency profile, to the unit that issues measurement requests, along with instructions, there is transmitted the information about the absence of the synchronisation in the emergency profile.