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  Nanosecond Precision Time Synchronization for Optical Data Center Networks

Lei, Y., Li, J., Liu, Z., Joshi, R., & Xia, Y. (2024). Nanosecond Precision Time Synchronization for Optical Data Center Networks. Retrieved from https://arxiv.org/abs/2410.17012.

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 Creators:
Lei, Yiming1, Author           
Li, Jialong1, Author           
Liu, Zhengqing2, Author
Joshi, Raj2, Author
Xia, Yiting1, Author                 
Affiliations:
1Networks and Cloud Systems, MPI for Informatics, Max Planck Society, ou_3361437              
2External Organizations, ou_persistent22              

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Free keywords: Computer Science, Networking and Internet Architecture, cs.NI
 Abstract: Optical data center networks (DCNs) are renovating the infrastructure design
for the cloud in the post Moore's law era. The fact that optical DCNs rely on
optical circuits of microsecond-scale durations makes nanosecond-precision time
synchronization essential for the correct functioning of routing on the network
fabric. However, current studies on optical DCNs neglect the fundamental need
for accurate time synchronization. In this paper, we bridge the gap by
developing Nanosecond Optical Synchronization (NOS), the first
nanosecond-precision synchronization solution for optical DCNs general to
various optical hardware. NOS builds clock propagation trees on top of the
dynamically reconfigured circuits in optical DCNs, allowing switches to seek
better sync parents throughout time. It predicts drifts in the tree-building
process, which enables minimization of sync errors. We also tailor today's sync
protocols to the needs of optical DCNs, including reducing the number of sync
messages to fit into short circuit durations and correcting timestamp errors
for higher sync accuracy. Our implementation on programmable switches shows
28ns sync accuracy in a 192-ToR setting.

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Language(s): eng - English
 Dates: 2024-10-222024-10-222024
 Publication Status: Issued
 Pages: 17 p.
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: arXiv: 2410.17012
URI: https://arxiv.org/abs/2410.17012
BibTex Citekey: Lei_2410.17012
 Degree: -

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