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Method and device for controlling a clock signal generator

A technology for controlling clock signals and clock signals, applied in multiplex communication, synchronous signal speed/phase control, time-division multiplexing systems, etc., can solve problems such as any technical solutions that do not teach the use of information content

Inactive Publication Date: 2016-09-21
TELLABS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, US2008 / 0049743 does not teach any technical solution for improving the utilization of the information content of a single timed message stream

Method used

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  • Method and device for controlling a clock signal generator
  • Method and device for controlling a clock signal generator
  • Method and device for controlling a clock signal generator

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Embodiment Construction

[0035] figure 1 A schematic diagram of an exemplary data transmission system including network element 102 and network element 109 is shown. The network elements 102 and 109 are interconnected via a data transfer network 113, which may comprise a number of other network elements interconnected to each other via data transfer links. Each network element may be, for example, an Internet Protocol ("IP") router, an Ethernet switch, and / or a Multiprotocol Label Switching ("MPLS") switch. The network element 102 comprises a controllable clock signal generator 108 arranged to generate a clock signal 110 . The network element 102 comprises a counter 114 arranged to generate a signal 115 representative of the clock time applicable at the network element 102 . The network element 102 includes a processing system 118 for performing control and forwarding plane operations related to the data transport protocol used, eg, IP, Ethernet and / or MPLS. Furthermore, the network element 102 com...

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Abstract

A device for controlling a clock signal generator comprises a processor (101) for forming at least two mutually different control quantities on the basis of reception moments of timing messages such as time stamps, where the reception moments are expressed as time values based on a first clock signal and the timing messages are transmitted in accordance with a second clock signal. The processor also calculates a weighted sum of the control quantities, and controls the clock signal generator with the weighted sum so as to synchronize the first clock signal and the second clock signal. The control quantities may represent, for example, a filtered value of observed phase-errors, a phase-error corresponding to a minimum observed transfer delay, and phase-errors corresponding to a given portion of the delay distribution. Using the weighted sum of the mutually different control quantities improves the utilization of the information content of the timing messages.

Description

technical field [0001] The invention relates to a method and a control device for controlling a clock signal generator to generate a clock signal synchronized with a reference clock signal. Furthermore, the present invention relates to a computer program for controlling a clock signal generator to generate a clock signal synchronized with a reference clock signal. Furthermore, the invention relates to network elements of a data transmission network, such as routers or switches. Background technique [0002] A data transmission network includes network elements, such as routers, switches, and terminal devices, that communicate with each other via data transmission links between the network elements. In many data transmission networks there is a need to achieve phase or at least frequency synchronization between clock signals applicable at various network elements of the data transmission network. The network elements may be configured to form master-slave pairs for distribu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L7/00H04L7/02H04J3/06
CPCH04J3/0664H04L7/08
Inventor 肯尼斯·哈恩米科·劳莱宁海基·拉马宁乔纳斯·伦德奎斯特
Owner TELLABS