Timing and Synchronization over Ethernet

In this thesis an investigation will be done on how time and frequency can be synchronized over Ethernet with help of Precision Time Protocol and Synchronous Ethernet. The goal is to achieve a high accuracy in the synchronization when a topology of 10 cascaded nodes is used. Different approaches may...

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Bibliographic Details
Main Author: Lundqvist, Emil
Format: Others
Language:English
Published: Linköpings universitet, Institutionen för systemteknik 2015
Subjects:
PTP
Online Access:http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-115882
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spelling ndltd-UPSALLA1-oai-DiVA.org-liu-1158822015-03-25T06:40:47ZTiming and Synchronization over EthernetengLundqvist, EmilLinköpings universitet, Institutionen för systemteknikLinköpings universitet, Tekniska högskolan2015EthernetPTPSyncETime & FrequencyIn this thesis an investigation will be done on how time and frequency can be synchronized over Ethernet with help of Precision Time Protocol and Synchronous Ethernet. The goal is to achieve a high accuracy in the synchronization when a topology of 10 cascaded nodes is used. Different approaches may be used when implementing Precision Time Protocol for synchronization. They will be investigated and the best approach for a good accuracy will be proposed. Another question that this thesis will cover is how to recover a radio frequency, a multiple of 3.84 MHz from Ethernets 10.3125 GHz. By using hardware support for the timestamps and transparent clocks in the forwarding nodes the best accuracy is achieved for the time and phase synchronization. Combining this with Synchronous Ethernet for frequency synchronization, to get a traceable clock through the system, will lead to the best result. The total error does not need to be greater than 1.46~ns if the asymmetry in the medium is neglected and a welldesigned PCS and FIFO are used. Recovering the radio frequency from Ethernet is done by using the highest common frequency, either an integer phase locked loop or a fractional phase locked loop can be used. The fractional phase locked loop will give a better result but will contribute with spurs that the integer phase locked loop does not. Student thesisinfo:eu-repo/semantics/bachelorThesistexthttp://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-115882application/pdfinfo:eu-repo/semantics/openAccess
collection NDLTD
language English
format Others
sources NDLTD
topic Ethernet
PTP
SyncE
Time & Frequency
spellingShingle Ethernet
PTP
SyncE
Time & Frequency
Lundqvist, Emil
Timing and Synchronization over Ethernet
description In this thesis an investigation will be done on how time and frequency can be synchronized over Ethernet with help of Precision Time Protocol and Synchronous Ethernet. The goal is to achieve a high accuracy in the synchronization when a topology of 10 cascaded nodes is used. Different approaches may be used when implementing Precision Time Protocol for synchronization. They will be investigated and the best approach for a good accuracy will be proposed. Another question that this thesis will cover is how to recover a radio frequency, a multiple of 3.84 MHz from Ethernets 10.3125 GHz. By using hardware support for the timestamps and transparent clocks in the forwarding nodes the best accuracy is achieved for the time and phase synchronization. Combining this with Synchronous Ethernet for frequency synchronization, to get a traceable clock through the system, will lead to the best result. The total error does not need to be greater than 1.46~ns if the asymmetry in the medium is neglected and a welldesigned PCS and FIFO are used. Recovering the radio frequency from Ethernet is done by using the highest common frequency, either an integer phase locked loop or a fractional phase locked loop can be used. The fractional phase locked loop will give a better result but will contribute with spurs that the integer phase locked loop does not.
author Lundqvist, Emil
author_facet Lundqvist, Emil
author_sort Lundqvist, Emil
title Timing and Synchronization over Ethernet
title_short Timing and Synchronization over Ethernet
title_full Timing and Synchronization over Ethernet
title_fullStr Timing and Synchronization over Ethernet
title_full_unstemmed Timing and Synchronization over Ethernet
title_sort timing and synchronization over ethernet
publisher Linköpings universitet, Institutionen för systemteknik
publishDate 2015
url http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-115882
work_keys_str_mv AT lundqvistemil timingandsynchronizationoverethernet
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