Knowledge Base

Title Authors Last Update Category
NIST TN1337: Characterization of Clocks and Oscillators D.B. Sullivan, D.W. Allan, DA. Howe, F.L. Walls

This is a collection of published papers assembled as a reference for those involved in characterizing and specifying high-performance clocks and oscillators. It is an interim replacement for NBS Monograph 140, Time and Frequency: Theory and Fundamentals, an older volume of papers edited by Byron E. Blair. This current volume includes tutorial papers, papers on standards and definitions, and a collection of papers detailing specific measurement and analysis techniques. The discussion in the introduction to the volume provides a guide to the content of the papers, and tables and graphs provide further help in organizing methods described in the papers

June 11, 2016 External Links
G.fast Certification Test Setup & Calibration Lincoln Lavoie, Michael Arnoldy

The forthcoming Broadband Forum G.fast Certification Program, based on the ID-337 test plan, presents a number of unique challenges, including requirements for testing multiple CPEs (customer premise equipment) connected to a DPU (demarcation point unit) using a multi-pair cable. This white paper describes an approach to the construction of a copper cable plant...

May 31, 2016 White Papers
Ensuring Interoperability for Open Networking Systems Christina Dube, Daniel Gray and David Woolf

Open Networking has created new opportunities and new challenges for Data Center designers and implementers. Many customers are used to deploying monolithic solutions from a single integrator. When implementing Open Networking solutions from multiple providers, a few key questions arise: Will it all work? Are there common interfaces I can use to monitoring and control the hardware? How do Data Center designers and implementers ensure that the components they’ve chosen will be interoperable? Will the Open Networking Solution work as well as or better than a traditional monolithic solution?

May 31, 2016 White Papers
IoT: Evolving Networks to Meet the Opportunity Timothy Winters

This presentation was used in a Light Reading online seminar - it provides an overview the evolving networks of IoT and operators’ networks will need to evolve in order to address this diverse IoT opportunity.

May 11, 2016 Tutorials
Time Sensitive Networking (TSN) Overview Bob Noseworthy

Not familiar with TSN? Refer to the following overview summarizing activities and materials from Michael Johas Teener (IEEE 802.1 TSN Chair), Dr Edward Lee (UC Berkley), and numerous other parties, conferences and events.

Get involved!

January 13, 2016 Tutorials
RVU Alliance Testing Robert Noseworthy

The UNH-IOL is an approved RVU Alliance Independent Certification Vendor (ICV). With a UNH-IOL Home Networking (HNC) membership companies are able to certify an unlimited amount of devices in a year. For companies looking to obtain RVU Alliance certification for only a few devices a year, the HNC offers pay-as-you-go RVU test services. Please note, these test services are available to RVU Alliance™ members only.

April 17, 2015 White Papers
Quartz Crystal Resonators and Oscillators for Frequency Control and Timing Applications - A Tutorial John Vig

This is a slide deck.
Chapter 1 (20 slides) provides an overview of clock synchronization applications.
Chapter 7 (11 slides) compares various types of oscillator.
Chapter 8 (33 slides) provides an overview of timekeeping.
The remainder of the 300 slides describe engineering details of quartz oscillators.

October 22, 2014 External Links
Tutorial: The Time-Synchronization Standard from the AVB/TSN suite IEEE STd 802.1AS-2011 and following Kevin Stanton, Intel

This presentation provides an overview of clock and time synchronization across heterogeneous networks using the published standards:
- IEEE Std 802.1AS(TM)-2011 and
- IEEE Std 802.11(TM)-2012 Timing Measurement

With special focus on wireless / 802.11 links

July 17, 2014 External Links
An Efficient Method for Stream Semantics over RDMA P. MacArthur and R. Russell

Most network applications today are written to use TCP/IP via sockets. Remote Direct Memory Access (RDMA) is gaining popularity because its zero-copy, kernel-bypass features provide a high throughput, low latency reliable transport. Unlike TCP, which is a stream-oriented protocol, RDMA is a message-oriented protocol, and the OFA verbs library for writing RDMA application programs is more complex than the TCP sockets interface. UNH EXS is one of several libraries designed to give applications more convenient, high-level access to RDMA features. Recent work has shown that RDMA is viable both in the data center and over distance.

One potential bottleneck in libraries that use RDMA is the requirement to wait for message advertisements in order to send large zero-copy messages. By sending messages first to an internal, hidden buffer and copying the message later, latency can be reduced at the expense of higher CPU usage at the receiver. This paper presents a communication algorithm that has been implemented in the UNH EXS stream-oriented mode to allow dynamic switching between sending transfers directly to user memory and sending transfers indirectly via an internal, hidden buffer depending on the state of the sender and receiver. Based on preliminary results, we see that this algorithm performs well under a variety of application requirements.

May 21, 2014 White Papers
Epoch Converter

Epoch & Unix Timestamp Conversion Tools

October 7, 2013 External Links