Time Appliances Project

Welcome

Welcome to the OCP Time Appliances Project wiki.

This Project is open to the public and we welcome all those who would like to be involved.

Time is a key element to get the highest efficiency in a distributed system. The performance of a distributed system depends on the synchronization of its elements. Several industries such as telecom, mobile, power, industrial, professional audio and video and many more have embraced the need for highly accurate and more importantly reliable distribution and synchronization of time and frequency across packet networks. Although the use case scenario for each of the industries is different, they all share one common thing and that is, time synchronization. Since there is a diverse need for time synchronization across different industries, driven from different use cases and applications, managing the needs of this industry chain becomes a challenge.

Time Appliances Project (TAP) aims to provide a platform to bring together, discuss, standardize and share technologies and solutions across industries with the datacenter applications and datacenter network infrastructure as the main interest. The project aims to bring together the community of datacenter operators, application developers, and equipment and semiconductor companies together to enable datacenter time-sensitive applications such as consistency in distributed systems, edge computing, AR/VR and IoT. These applications will greatly benefit from high accuracy, reliable, and scalable distribution and synchronization of time.

IEEE 1588 Precision Timing Protocol (PTP) and other synchronization methods have been adopted by various industries to maximize the efficiency of various distributed system use cases. Each use case scenario comes with a set of requirements and configurations. These configurations are collected as a ‘PTP profile’. Time appliances project aims to support the development of a PTP profile for datacenter applications and datacenter network infrastructure. The profile will cover time-sensitive applications over OCP-compliant and PTP-aware networking infrastructure such as network switches, network clocks, network interface cards, timing modules & connectors, etc. Additionally, the profile will address various requirements for high accuracy and reliable distribution and synchronization of time, such as expected performance, networking, software API, data models, deployment and telemetry. The project also aims at openness and interoperability through the use of open-source PTP software implementations for timing appliances.

Datacenter applications are the primary target of time appliances project. In addition, the project extends to related topics on time synchronization in academia, research and other industries. The time appliances project brings together the community and will be highly collaborative through technical meetings and collaboration with other OCP Projects including the Networking, Storage, Server, and Telco Projects.

Disclaimer: Please do not submit any confidential information to the Project Community. All presentation materials, proposals, meeting minutes and/or supporting documents are published by OCP and are open to the public in accordance to OCP's Bylaws and IP Policy. This can be found on the OCP OCP Policies page. If you have any questions please contact OCP.

Mission Statement

1. Create specifications and references for Data Center Timing appliances, applications and networking infrastructure

2. Promote openness in Timing Appliances and interfaces through open-source implementations

Project Leadership

Leads:

- Ahmad Byagowi (Facebook)

- Elad Wind (NVIDIA)

Interim IC Rep:

- Rajeev Sharma (OCP)

Workstreams

	Project	Objective	POC	Meeting Schedule
#1	Open Source Grandmaster	Development of an open source grandmaster for DC and Edge systems	Oleg Obleukhov & Dotan Levi	discussed during project calls
#2	Data Center PTP Profile	Development of a PTP Profile tailored for data center applications	Michel Ouellette
#3	Precision Time API	Time APIs to disseminate the time error (error bound) and bring accurate time to the user space	Georgi Chalakov
#4	Oscillators	Classification and measuring of oscillators	Gary Giust
	Overall	Project meeting coordinator	Kelvin Chukwu	please send all inquiries to Kelvin

Get Involved

- TAP Mailing List

- OCP Projects Calendar

Documents

- OCP Presentation Template - please contact Michael Schill or Archna Haylock for a copy

Release Candidates (RC) Docs

Name	Format	Version	Date
Open Source Grandmaster	MD	v0.2	March 31, 2021
Data Center PTP Profile	PDF	v0.2	April 1, 2021

TAP GitHub

- Github Repo

TAP Google Drive

- Google Drive Document Repository

Regular Project Calls

- Wednesdays at 11am PST, starting on July 15th, 2020. Repeats every 2 weeks following that

- Please contact Kelvin Chukwu to propose any agenda items

Join the meeting from your computer, tablet or smartphone:

https://global.gotomeeting.com/join/565185493                       

Dial in:

United States (Toll Free): +1 877 309 2073                                        
United States:             +1 571 317-3129                                        
Access Code:                565-185-493

Recordings from Past Calls

	Date	Topics	Speakers	Slides
#18	Mar-24, 2021	Introduction to Project Corundum for Time services	Alex Forencich	Slides
#17	Mar-10, 2021	Oscillators Classification, Workstream #4 goals and kickoff		Slides
#16	Feb-24, 2021	GNSS Timing	Samuli Pietila
#15	Feb-10, 2021	Centralized GNSS Monitoring and Assurance	Nir Laufer	Slides
#14	Jan-27, 2021	Huygens and its Applications	Professor Balaji Prabhakar
#13	Jan-13, 2021	TAP 2020 Recap, 2021 Plans		Slides
#12	Dec-16, 2020	Chip Scaled Atomic Clocks	Dr. John Kitching	Slides
#11	Dec-2, 2020	Data Center PTP Profile, Workstream #2 proposal
#10	Nov-18, 2020	Computer Timekeeping and Synchronization	Kevin Stanton, Ph.D.	Slides
#9	Nov-4, 2020	Time Sync in TSNs . History of TSN . IEEE 802.1AS Overview		Slides
#8	Oct-21, 2020	Starter's guide to ptp4l	Maciej Machnikowski	Slides
#7	Oct-7, 2020	Timing card implementation
#6	Sep-23, 2020	Practical Use Cases of Synchronized Clocks
#5	Sep-9, 2020	Data Center PTP Profile, Workstream #2 goals and draft spec
#4	Aug-26, 2020	Open Grandmaster, Workstream #1 goals and draft spec
#3	Aug-12, 2020	A. TAP Vision B. Impact of Precision Oscillator Noise on PTP Time Error
#2	Jul-29, 2020	Detailed Project Proposal and Discussion
#1	Jul-15, 2020	Proposal to launch OCP-TAP Incubation Project		Slides

Presentations & Videos

- OCP TAP - Vision

- TAP Presentation

- Impact of Oscillator Noise on PTP Time Error – Part 1

- Impact of Oscillator Noise on PTP Time Error – Part 2

- ELPROMA TAP Remarks Oct 7 2020

Recordings from Workstream Calls

Workstream	Date	Meeting	Slides
#4 Oscillators	March 18th, 2021	Recording	Slides
	March 31st, 2021	Recording

References & External Links

- Spanner, TrueTime & The CAP Theorem by Eric Brewer, Google

- Practical Uses of Synchronized Clocks in Distributed Systems by Barbara Liskov

- Stanford Paper for reference only

- Spanner Paper for reference only

- On Time Synchronization Issues in Time-Sensitive Networks with Regulators and Nonideal Clocks for reference only, raised by Elad

- Accurate Network Clock Synchronization at Scale for reference only, raised by Hesham

- Exploiting a Natural Network Effect for Scalable, Fine-grained Clock Synchronization for reference only, raised by Hesham

- SIMON: A Simple and Scalable Method for Sensing, Inference and Measurement in Data Center Networks for reference only, raised by Hesham

- New Guidelines for Inclusiveness for reference only, raised by Michael