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- Newsgroups: comp.protocols.time.ntp
- Path: sparky!uunet!haven.umd.edu!darwin.sura.net!uvaarpa!cv3.cv.nrao.edu!cv3.cv.nrao.edu!dwells
- From: dwells@fits.cv.nrao.edu (Don Wells)
- Subject: Re: Service in UK
- In-Reply-To: whiskerp@logica.co.uk's message of Mon, 25 Jan 1993 12: 18:57 GMT
- Message-ID: <DWELLS.93Jan25091527@fits.cv.nrao.edu>
- Sender: news@nrao.edu
- Organization: nrao
- References: <whiskerp.26.0@logica.co.uk>
- Date: Mon, 25 Jan 1993 14:15:27 GMT
- Lines: 48
-
- In article <whiskerp.26.0@logica.co.uk> whiskerp@logica.co.uk (Peter
- Whisker) writes: "... It seems that the UK has no NTP servers - the
- nearest (and the only GMT/BST time zone one) is Trinity College
- Dublin..."
-
- The subject of precision time distribution across the Internet arose
- in newsgroup sci.astro about a month ago. Here is a relevant followup
- from that discussion:
- > Newsgroups: sci.astro
- > Organization: British Telecommunications plc
- > From: jcs@zoo.bt.co.uk (John C Sager)
- > Subject: Re: Universal time
- > Date: 23 Dec 92 10:47:46 GMT
- >
- > In article <DWELLS.92Dec17184737@fits.cv.nrao.edu>, dwells@fits.cv.nrao.edu
- > (Don Wells) writes:
- >
- > [...]
- >
- > > Precision distribution of time across the Internet has been an
- > > operational reality for several years, using NTP [Network Time
- > > Protocol]. Master ("stratum 1") servers exist in (all?) regional nets
- > > of the NSFnet and in most regional nets worldwide, probably including
- > > the UK.
- >
- > There are several NTP time servers operating in the UK at stratum 1, ie
- > they derive their time from an external high-accuracy source. My
- > own machine, bear.zoo.bt.co.uk (132.146.40.28), does this normally, taking
- > its time reference from a GPS receiver. Its system clock is rarely
- > more than 50 microseconds away from UTC, and one ought to be able to
- > maintain millisecond accuracy from it in the UK running the latest
- > version of xntp3 from louie.udel.edu.
- > At this time, and over the Christmas period, my server is at stratum 2
- > as I am evaluating the navigation performance of the GPS receiver in my car.
- > It will be back to full accuracy in early January 1993.
- >
- > John C Sager Mail: B67 G18, BT Labs
- > Email: jcs@zoo.bt.co.uk Martlesham Heath
- > Tel: +44 473 642623 IPSWICH IP5 7RE
- > Fax: +44 473 637614 England
-
-
- --
-
- Donald C. Wells Associate Scientist dwells@nrao.edu
- National Radio Astronomy Observatory +1-804-296-0277
- 520 Edgemont Road Fax= +1-804-296-0278
- Charlottesville, Virginia 22903-2475 USA 78:31.1W, 38:02.2N
-