Multiplex communications – Communication over free space – Combining or distributing information via time channels
Patent
1999-01-19
2000-10-17
Hsu, Alpus H.
Multiplex communications
Communication over free space
Combining or distributing information via time channels
370503, 375356, 709208, 709248, 331 14, H04J 306, H04L 700, G06F 1516
Patent
active
061342343
ABSTRACT:
The invention relates to synchronization of network elements in a network that uses master-slave synchronization. The use of the known monitoring bit MCB (Master Clock Bit) is expanded in the method so that it is transmitted all the way from the master network element, for example the mobile switching center (MSC). If one of the network elements located between the master network element and a specific slave network element, for example a base station, does not accept the received signal as the synchronization source because of its quality, the network element in question forces the MCB bit located in the signal that the element transmits further to state 1. If the transmission unit of a specific slave network element is locked to the signal which includes the MCB in state 1, or if the element is forced to revert to using the internal clock because of a fault situation of the signal, the transmission unit activates the alert. Before the start of and during the synchronization of the base station clock, the fault status is read from the transmission unit and the synchronization is prevented or interrupted if the alert is on. The alert is given to other units of the base station in question from which the fault monitoring unit further transmits it through a separate operations and maintenance network to the operations center of the network operator.
REFERENCES:
patent: 4677614 (1987-06-01), Circo
patent: 4759009 (1988-07-01), Casady et al.
patent: 4794596 (1988-12-01), Gloyne et al.
patent: 4894846 (1990-01-01), Fine
patent: 5555548 (1996-09-01), Iwai et al.
patent: 5751220 (1998-05-01), Ghaffari
patent: 5905869 (1999-05-01), Hornung et al.
patent: 5907685 (1999-05-01), Douceur
International Search Report for PCT/FI97/00432 Dec. 16, 1997.
Hsu Alpus H.
Nokia Telecommunications Oy
Qureshi Afsar M.
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