Enhanced restart of nodes after interruption

A method for resuming a time of a local clock of a first node in a system after an interruption of service of the first node, the system comprising a memory, a second node and one or more frequency oscillator, each oscillator being in connection with one or both of the first and second node, the method comprising:

• receiving, in the first node from the second node, a first sync pulse;
• obtaining, in the first node, first data related to the first sync pulse;
• timestamping, in the first node, the received first sync pulse with a timestamp t1 relating to a time when the first sync pulse was received in relation to the local clock in the first node;
• storing, in the memory of the system, the timestamped first sync pulse
• and the obtained first data;
• interrupting service of the first node;
• restarting the service of the first node, the restarting comprising:
• retrieving, in the first node, information from the memory, the information indicating the first sync pulse and its timestamp, t1, and
• the obtained first data;
• receiving, in the first node from the second node, a second sync pulse;
• obtaining, in the first node, second data related to the second sync pulse, wherein the first and second data enables the first node to estimate a time that has passed between a second sync pulse and a first sync pulse;
• timestamping, in the first node, the received second sync pulse with a timestamp t2 relating to a time when the sync pulse was received in relation to the local clock in the first node;
• estimating, in the first node, based on the retrieved information, the timestamp t2 of the second sync pulse and the second data, a time error, E, of the local clock of the first node;
• and
• adjusting the internal clock of the first node using the estimated time error to resume the time of the local clock.