Highly Accurate Timestamping for Ethernet-Based Clock Synchronization
It is not only for test and measurement of great importance to synchronize clocks of networked devices to timely coordinate data acquisition. In this context the seek for high accuracy in Ethernet-based clock synchronization has been significantly supported by enhancements to the Network Time Protoc...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2012-01-01
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| Series: | Journal of Computer Networks and Communications |
| Online Access: | http://dx.doi.org/10.1155/2012/152071 |
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| Summary: | It is not only for test and measurement of great
importance to synchronize clocks of networked devices to timely
coordinate data acquisition. In this context the seek for high
accuracy in Ethernet-based clock synchronization has been
significantly supported by enhancements to the Network Time
Protocol (NTP) and the introduction of the Precision Time
Protocol (PTP). The latter was even applied to instrumentation and
measurement applications through the introduction of LXI. These
protocols are usually implemented in software; however, the
synchronization accuracy can only substantially be improved by
hardware which supports drawing of precise event timestamps.
Especially, the quality of the timestamps for ingress and egress
synchronization packets has a major influence on the achievable
performance of a distributed measurement or control system.
This paper analyzes the influence of jitter sources remaining
despite hardware support and proposes enhanced methods for
up to now unmatched timestamping accuracy in Ethernet-based
synchronization protocols. The methods shown in this paper
reach sub-nanosecond accuracy, which is proven in theory and
practice. |
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| ISSN: | 2090-7141 2090-715X |