A Network Time Interface M-Module for Distributing GPS-Timeover LANs
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- 作者：Schmid ; Ulrich ; Klasek ; Johann ; Mandl ; Thomas ; Nachtnebel ; Herbert ; Cadek ; Gerhard ; Kerö ; Nikolaus
- 关键词：Interval ; based external clock synchronization ; GPS time distribution ; fault ; tolerant distributed real ; time systems ; COTS ; M ; Modules ; Ethernet ; experimental evaluation
- 刊名：Real-Time Systems
- 出版时间：2000
- 出版年：2000
- 期刊代码：38_09226443
- 类别：soc
- 卷：18
- 期：1
- 页码：25-57
- 数据来源：sp
摘要
This paper provides a comprehensive overview of our Network Time Interface(NTI) M-Module, which facilitates high-accuracy time distributionin LAN-based distributed real-time systems. Built around ourcustom UTCSU VLSI chip, it hosts all the hardware support requiredfor interval-based external clock synchronization: A high-resolutionstate- and rate-adjustable clock, local accuracy intervals, interfacesto GPS receivers, and various timestamping features. Maximumnetwork controller and CPU independence ensures that the availableNTI prototype can be employed in virtually any COTS-based systemwith MA-Module interface. Our experimental evaluation shows thattime distribution with s-accuracy is possibleeven in Ethernet-based system architectures, provided that theavailable configuration parameters are suitably chosen to copewith the various hidden sources of timing uncertainty.