Using Wwvb as a Timing Reference for Ntp Servers

<h1>Using Wwvb as a Timing Reference for Ntp Servers</h1>Author: <a title="Richard n Williams" href="http://www.articlesbase.com/authors/richard-n-williams/55514.htm">Richard n Williams</a> Atomic clocks are incredibly expensive and generally they are normally only to be found in large scale physics laboratories such as MIT (Massachusetts Institute of Technology), NIST (National Institute of Standards and Technology (Colorado) or the National Physical Laboratory in the UK. Fortunately many national laboratories broadcast the UTC (Coordinated Universal Time) time from their atomic clocks via a radio broadcast. In the US the national timing broadcast is called WWVB and is broadcast by NIST in Fort Collins, Colorado. The WWVB broadcast is used by millions of people throughout North America to synchronize consumer electronic products like wall clocks, clock radios, and wristwatches. In addition, WWVB is used for high-level applications such as network time synchronization utilizing NTP. The time code contains the year, day of year, hour, minute, second, and flags that indicate the status of Daylight Saving Time, leap years, and leap seconds. WWV broadcasts on 2.5, 5, 10, 15, and 20 MHz and for most users in the United States, the received accuracy should be less than 10 milliseconds (1/100 of a second). While many NTP servers now use GPS to receive a timing reference, the advantage of using a radio transmission is that a signal can be received indoors (a GPS antenna needs a good view of the sky). However, the radio signal has a finite range and can be blocked by skyscrapers, mountains and dense conurbations. A radio based NTP server usually consists of a rack-mountable time server, and an antenna, consisting of a ferrite bar inside a plastic enclosure, which receives the radio time and frequency broadcast. The antenna should always be mounted horizontally at a right angle toward the transmission for optimum signal strength. Similar national timing transmissions are broadcast from other countries in the UK the signal is referred to as MSF and is broadcast by the National Physical Laboratory in Cumbria, other systems are broadcast in Frankfurt, Germany (DCF-77), Japan (JJY) and France (TDF)About the Author: Richard N Williams is a technical author and specialist in atomic clocks, telecommunications, NTP and network time synchronisation helping to develop dedicated NTP clocks. Please visit us for more information about an <a href="http://www.galsys.co.uk/categories/ntp-server.htm">NTP server</a> or other <a href="http://www.galsys.co.uk/time-server/ntp-time-server.html">network time server </a> solutions.Article Source: <a href="http://www.articlesbase.com/">ArticlesBase.com</a> - <a href="http://www.articlesbase.com/networks-articles/using-wwvb-as-a-timing-reference-for-ntp-servers-477750.html" title="Using Wwvb as a Timing Reference for Ntp Servers">Using Wwvb as a Timing Reference for Ntp Servers</a>

Atomic clocks are incredibly expensive and generally they are normally only to be found in large scale physics laboratories such as MIT (Massachusetts Institute of Technology), NIST (National Institute of Standards and Technology (Colorado) or the National Physical Laboratory in the UK.

Fortunately many national laboratories broadcast the UTC (Coordinated Universal Time) time from their atomic clocks via a radio broadcast.

In the US the national timing broadcast is called WWVB and is broadcast by NIST in Fort Collins, Colorado. The WWVB broadcast is used by millions of people throughout North America to synchronize consumer electronic products like wall clocks, clock radios, and wristwatches. In addition, WWVB is used for high-level applications such as network time synchronization utilizing NTP.

The time code contains the year, day of year, hour, minute, second, and flags that indicate the status of Daylight Saving Time, leap years, and leap seconds.

WWV broadcasts on 2.5, 5, 10, 15, and 20 MHz and for most users in the United States, the received accuracy should be less than 10 milliseconds (1/100 of a second).

While many NTP servers now use GPS to receive a timing reference, the advantage of using a radio transmission is that a signal can be received indoors (a GPS antenna needs a good view of the sky).

However, the radio signal has a finite range and can be blocked by skyscrapers, mountains and dense conurbations. A radio based NTP server usually consists of a rack-mountable time server, and an antenna, consisting of a ferrite bar inside a plastic enclosure, which receives the radio time and frequency broadcast. The antenna should always be mounted horizontally at a right angle toward the transmission for optimum signal strength.

Similar national timing transmissions are broadcast from other countries in the UK the signal is referred to as MSF and is broadcast by the National Physical Laboratory in Cumbria, other systems are broadcast in Frankfurt, Germany (DCF-77), Japan (JJY) and France (TDF)

Richard N Williams is a technical author and specialist in atomic clocks, telecommunications, NTP and network time synchronisation helping to develop dedicated NTP clocks. Please visit us for more information about an NTP server or other network time server solutions.

Rate this Article:

0 / 5 stars - 0 vote(s)

Re-Publish

Article Source: http://www.articlesbase.com/networks-articles/using-wwvb-as-a-timing-reference-for-ntp-servers-477750.html

Related Videos
Related Articles
Ask / Related Q&A

Play

How to Work with SQL SERVER – 2005 Constraint

Play

Introducing Windows Server Foundation - FrugalTech

Play

Windows Home Server for Small Business - FrugalTech

Play

How to use Symantec Backup Exec for Windows Servers

Play

How To Deploy A New Server - FrugalTech

Latest Networks Articles
More from Richard n Williams

Easy Ways to Make Money

By: donkeymailer | 31/12/2009
Although there are thousands of different ways to make money online in the comfort of apartments and keep increasing the number every single day. But most of them are not easy to make money online.

Cisco 640-553 exam

By: andy | 31/12/2009
With our products and ample questions practice, there is no possibility of you failing the exam. For most of the questions exam of Implementing Cisco IOS Network Security (IINS) repeats the questions but changes the answers, the values etc and hence presence of mind and soundness of concepts is a must. Unless you know the gist of the theory, you cannot pass the exam.

EC0-350 exam torrent

By: andy | 31/12/2009
Certinside remains one of these most updated websites which is popular all over the world for its manifold characteristics. It keeps excellent information on IT Certifications and provides the current data. It has not only thorough information on every certification but also provides you your required study materials for your targeted certification. Certinside is the best choice for you.

642-145 test questions

By: andy | 31/12/2009
It is well known that Others 642-145 exam test is the hot exam of Cisco certification. Cisco certification exam offer you all the Q&A of the 642-145 real test . It is the examination of the perfect combination and it will help you pass 642-145 exam at the first time!

000-667 study guide

By: andy | 31/12/2009
There are many sites which provide information on IBM 000-667 exam and provide you study materials like IBM 000-667 dumps and others. To make a good preparation for this highly professional exam you must have a complete knowledge and for that you must use an authentic source. Certinside is the best source to prepare for your IBM 000-667 exam for 100 percent results.

642-586 exam torrent

By: andy | 31/12/2009
Certinside rightfully deals an IT test as a board exam. The first thing you have to do with Certinside is check out the sample objectives. You will get an idea of the actual products. Once you have the hang of the pattern of the test exam will be a piece of cake. Since the test comprises of multiple choice questions, in preparation of the test choice making is the most important thing to learn.

000-237 Exam Study Questions

By: andy | 31/12/2009
Certify Dumps Q&A are designed to maximize your learning productivity and focuses only on the important aspects that will help you pass your exam, the first time. We provide you IBM 000-237 Study Questions with verified answers accompanied by detailed explanations. These Study Questions are supplied by our industry experts, to provide you with an experience like taking the actual test and ensure that you fully understand the course, as well as the concepts behind the 000-237 Q&A.

350-030 braindump

By: andy | 31/12/2009
A passing grade on the beta qualifies a Cisco certification candidate to schedule the lab exam. Results, however, are typically not available until six to eight weeks after the close of the beta. A candidate may attempt the beta 350-030 study guide only once during the beta period.

The Fascinating World of Ladders

By: Richard n Williams | 23/12/2009 | Home Improvement
There is more to the humble ladder than you may think. Most households have them, under all that junk in the garage, or propped up in a cupboard, and yet little thought goes into what are quite fascinating tools.

The Funny side of Ladders

By: Richard n Williams | 23/12/2009 | Home Improvement
When the word ladder is ever uttered. Our minds always turn to think that aluminium ladder in the garage or the step ladders under the stairs. But the word ladder has had many uses over the years and not ladders can be climbed.

Choosing the Right Ladder for the Job

By: Richard n Williams | 23/12/2009 | Tools & Equipment
There are a vast array of different types of ladders on the market and it can be often confusing when it comes to buying a ladder to find the exact one that suits your requirements. Despite the myriad of names and terms given to some ladders, they pretty much fall into three categories:

How to Start Recycling

By: Richard n Williams | 23/12/2009 | Home & Family
It is estimated that four out of ten households are still not recycling their waste and the most common reason given is that people say they find recycling confusing.

Saving Money in the Winter Months – Money Saving Tips for Home and Office

By: Richard n Williams | 23/12/2009 | Home & Family
The winter brings with it more than just the cold and dark nights. Quite often winter is a time of high bills and large running costs especially if you have a home to run and a business. And with many of us now working at home and trying to run an office in the house, th e extra costs can be crippling this time of year.

Recycle your Christmas Tree

By: Richard n Williams | 23/12/2009 | Gardening
Christmas is a busy time, not just with all that eating, drinking and being merry. At Christmas time there is a huge deluge of recycling to be done; all that wrapping paper, empty boxes and left over turkey – not to mention the Christmas Tree.

Choosing an Eco Christmas gift

By: Richard n Williams | 17/12/2009 | Home & Family
We all know that Christmas is a time for giving but attempting to get that perfect gift for every member of the familiy can not only be difficult at the best of times but trying to buy an eco friendly Christmas gift can make it nearly impossible.

Stand-by Savers and Energy Monitors

By: Richard n Williams | 17/12/2009 | Home & Family
One of the biggest struggle throughout the cold winter months is trying to keep those large heating and lighting bills down. This time of year is an expensive one; with Christmas around the corner the last thing most of us need is huge heating bills landing on the mat in the New Year.