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公开(公告)号：EP3217590A4
公开(公告)日：2018-06-20
申请号：EP15856695
申请日：2015-10-23
CPC分类号： H04L7/0037 , G06F1/04 , G06F1/12 , H04B3/46 , H04J3/0638 , H04J3/0682 , H04L7/0008 , H04L7/10
摘要： A method and a device for providing a global clock in a system, the terminals in the system are channel connected to each other via paths, each terminal is communicatively connected to a clock source ultimately via a signal recording unit, respectively, the clock source sends a calibration signal to the network, the signal recording unit records the current transmitting time T (0) of the calibration signal, each terminal will receive the calibration signal sequentially due to different distances from the clock source and will return the signal, the backward signals are returned to the signal recording unit along the network sequentially, and the signal recording unit records the time T (n) of each backward signal sequentially, in this way, the signal recording unit can then measure the delay between each terminal and the clock source signal, which can be used as a correction parameter to ensure that all terminals are in exactly the same time reference, in addition, in this way, there is no need to control the length of the clock cables from each terminal to the clock source, and no special consideration is required for clock routing, and difficulties in system assembly, calibration, maintenance and expansion brought by large amounts of cable are avoided.
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公开(公告)号：EP3217249A4
公开(公告)日：2018-06-20
申请号：EP15856712
申请日：2015-10-29
CPC分类号： G06F1/12 , H04L7/0037
摘要： A method and a structure for determining a global clock among systems are disclosed. When a standardized time reference is required among systems, a reference clock source may transmit a calibration signal, and a transmitting time T d (0) may be recorded. Each system may respectively record an arrival time T a (n), transmit a return signal to a signal recording unit of the reference clock source, and record a transmitting time T b (n), after receiving the calibration signal. Similarly, because of different distances, the signal recording unit may record arrival times T d (n) of the return signals subsequently, and determine time delays Delay (n) between systems and the reference clock source respectively. When all the systems are required to have a completely standardized time reference, a corresponding Delay (n) may be acquired and transmitted to each system. Each system may determine zero deviations T c (n) of various local clocks from the reference clock source, and take T c (n) as a correction parameter to correct its own system clock, so that the local clocks of all the systems have a completely standardized time reference.
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