| 摘要 |
The present invention relates to a method and to an arrangement for synchronising at least one local oscillator (21) with a central time-generating unit (11). The local oscillator (21) serves a so-called element (2) included in a network (A), and the time-generating unit (11) is included in a so-called main unit (1) also included in the network (A). The frequency of the local oscillator (21) can be controlled by periodic and automatic calibration. The physical requirements within a part of the network (A) that includes the main unit (1) and all elements (2, 3, 4) concerned, said part being referred to here as a limited network (B), are so well defined that the transmission time of a time stamp from the main unit (1) to an element (2) will be known with a given degree of certainty. The inter-arrival time of the time stamps is used to calibrate the local oscillator (11) together with the known transmission time. |
