Communication device and time synchronization system
US8762796B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 28, 2012 |
| Grant date | Jun 24, 2014 |
| Priority date | — |
| Expiry date | Aug 24, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J3/14
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In an embodiment, provided is a communication device connected to time servers via a network with transfer devices. In the communication device: a network controller receives a message containing time information counted by the time server and containing a network identifier, and obtains a receiving timing of the message; a network processing unit, when the network identifier in the message does not match with any network identifier, destroys the message; a protocol processing unit, when the network identifier has a match, calculates a time error by the time information in the message and the receiving timing, detects whether a first time server is malfunctioning, and when detected the first time server malfunctioning, outputs the time error calculated by a network identifier assigned to a second time server; a servo calculates an operation amount by the time error; and a clock varies a clock rate according to the operation amount.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.