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   8                 <title>PTB Modem Time Service</title>
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  13                 <h3>European Automated Computer Time Services</h3>
  14                 <hr>
  15                 <p>Several European countries use the following message data format:</p>
  16                 <p><font size="-1" face="Courier New">Data format<br>
  17                                 0000000000111111111122222222223333333333444444444455555555556666666666777777777 7<br>
  18                                 0123456789012345678901234567890123456789012345678901234567890123456789012345678 9<br>
  19                                 1995-01-23 20:58:51 MEZ 10402303260219950123195849740+40000500 *<br>
  20                                 A B C D EF G H IJ K L M N O P Q R S T U V W XY Z&lt;CR&gt;&lt;LF&gt;<br>
  21                                 A year<br>
  22                                 B month<br>
  23                                 C day<br>
  24                                 D hour<br>
  25                                 E : normally<br>
  26                                 A for DST to ST switch first hour<br>
  27                                 B for DST to ST switch second hour if not marked in H<br>
  28                                 F minute<br>
  29                                 G second<br>
  30                                 H timezone<br>
  31                                 I day of week<br>
  32                                 J week of year<br>
  33                                 K day of year<br>
  34                                 L month for next ST/DST changes<br>
  35                                 M day<br>
  36                                 N hour<br>
  37                                 O UTC year<br>
  38                                 P UTC month<br>
  39                                 Q UTC day<br>
  40                                 R UTC hour<br>
  41                                 S UTC minute<br>
  42                                 T modified julian day (MJD)<br>
  43                                 U DUT1<br>
  44                                 V direction and month if leap second<br>
  45                                 W signal delay (assumed/measured)<br>
  46                                 X sequence number for additional text line in Y<br>
  47                                 Y additional text<br>
  48                                 Z on time marker (* - assumed delay / # measured delay)<br>
  49                                 &lt;CR&gt;!&lt;LF&gt; ! is second change !<br>
  50                         </font></p>
  51                 <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>
  52                 <ul>
  53                         <li>In Germany by Physikalisch-Technische Bundesanstalt (PTB)'s timecode service. Phone number: +49 5 31 51 20 38.
  54                                 <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>
  55                         <li>In the UK by National Physical Laboratory (NPL)'s TRUETIME service. Phone number: 0891 516 333
  56                                 <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>
  57                         <li>In Italy by Istituto Elettrotecnico Nazionale &quot;Galileo Ferrais&quot; (IEN)'s CTD service. Phone number: 166 11 46 15
  58                                 <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>
  59                         <li>In Switzerland by Swiss Federal Office of Metrology's timecode service. Phone number: 031 323 32 25
  60                                 <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>
  61                         <li>In Sweden by SP Swedish National Testing and Research Institute 's timecode service. Phone number: +46 33 415783.
  62                                 <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>
  63                 </ul>
  64                 <dl></dl>
  65                 <h4>Additional Information</h4>
  66                 <p><a href="../refclock.html">Reference Clock Drivers</a></p>
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