<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta name="GENERATOR" content="Adobe PageMill 3.0 per Windows"> <meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"> <title>PTB Modem Time Service</title> <link href="scripts/style.css" type="text/css" rel="stylesheet"> </head> <body> <h3>European Automated Computer Time Services</h3> <hr> <p>Several European countries use the following message data format:</p> <p><font size="-1" face="Courier New">Data format<br> 0000000000111111111122222222223333333333444444444455555555556666666666777777777 7<br> 0123456789012345678901234567890123456789012345678901234567890123456789012345678 9<br> 1995-01-23 20:58:51 MEZ 10402303260219950123195849740+40000500 *<br> A B C D EF G H IJ K L M N O P Q R S T U V W XY Z<CR><LF><br> A year<br> B month<br> C day<br> D hour<br> E : normally<br> A for DST to ST switch first hour<br> B for DST to ST switch second hour if not marked in H<br> F minute<br> G second<br> H timezone<br> I day of week<br> J week of year<br> K day of year<br> L month for next ST/DST changes<br> M day<br> N hour<br> O UTC year<br> P UTC month<br> Q UTC day<br> R UTC hour<br> S UTC minute<br> T modified julian day (MJD)<br> U DUT1<br> V direction and month if leap second<br> W signal delay (assumed/measured)<br> X sequence number for additional text line in Y<br> Y additional text<br> Z on time marker (* - assumed delay / # measured delay)<br> <CR>!<LF> ! is second change !<br> </font></p> <p>This format is an ITU-R Recommendation (ITU-R TF583.4) and is now available from the primary timing centres of the following countries: Austria, Belgium, Germany, Italy, The Netherlands, Poland, Portugal, Romania, Spain, Sweden, Switzerland, Turkey and United Kingdom. Some examples are:</p> <ul> <li>In Germany by Physikalisch-Technische Bundesanstalt (PTB)'s timecode service. Phone number: +49 5 31 51 20 38. <p>For more detail, see <a href="http://www.ptb.de/english/org/4/43/433/disse.html">http://www.ptb.de/english/org/4/43/433/disse.htm</a></p> <li>In the UK by National Physical Laboratory (NPL)'s TRUETIME service. Phone number: 0891 516 333 <p>For more detail, see <a href="http://www.npl.co.uk/npl/ctm/truetime.html">http://www.npl.co.uk/npl/ctm/truetime.html</a></p> <li>In Italy by Istituto Elettrotecnico Nazionale "Galileo Ferrais" (IEN)'s CTD service. Phone number: 166 11 46 15 <p>For more detail, see <a href="http://www.ien.it/tf/time/Pagina42.html">http://www.ien.it/tf/time/Pagina42.html</a></p> <li>In Switzerland by Swiss Federal Office of Metrology's timecode service. Phone number: 031 323 32 25 <p>For more detail, see <a href="http://www.metas.ch/en/labors/official-time/modem/index.html">http://www.ofmet.admin.ch/de/labors/4/Zeitvert.html </a></p> <li>In Sweden by SP Swedish National Testing and Research Institute 's timecode service. Phone number: +46 33 415783. <p>For more detail, see <a href="http://www.sp.se/metrology/timefreq/eng/tandf.htm">http://www.sp.se/metrology/timefreq/eng/tandf.htm</a></p> </ul> <dl></dl> <h4>Additional Information</h4> <p><a href="../refclock.html">Reference Clock Drivers</a></p> <hr> <script type="text/javascript" language="javascript" src="scripts/footer.txt"></script> </body> </html>