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diff --git a/html/driver23.htm b/html/driver23.htm new file mode 100644 index 000000000000..8d6fc9d9eb2e --- /dev/null +++ b/html/driver23.htm @@ -0,0 +1,178 @@ +<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> +</HEAD> +<BODY> + +<H3>PTB Modem Time Service and other European Laboratories Time +Services</H3> + +<HR ALIGN=LEFT> + +<H4>Synopsis</H4> + +<P>Address: 127.127.23.<I>u</I> <BR> +Reference ID: <TT>PTB</TT> <BR> +Driver ID: <TT>ACTS_PTB</TT><BR> +Serial Port: <TT>/dev/ptb<I>u</I></TT>; 1200 baud, 8-bits, no +parity <BR> +Requires: <TT>/usr/include/sys/termios.h</TT> header file with +modem control</P> + +<H4>Description</H4> + +<P>This driver supports the PTB Automated Computer Time Service +(ACTS) and it is a modified version of the NIST ACTS driver so +see it for more informations..</P> + +<P>It periodically dials a prespecified telephone number, receives +the PTB timecode data and calculates the local clock correction. +It designed primarily for use when neither a radio clock nor connectivity +to Internet time servers is available. For the best accuracy, +the individual telephone line/modem delay needs to be calibrated +using outside sources.</P> + +<P>The only change between this driver and the NIST one is the +data format. Infact PTB data format is the following:</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><BR> +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, 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. +</UL> + +<BLOCKQUOTE> + <P>For more detail, see <A HREF="http://www.ptb.de/english/org/4/43/433/disse.htm">http://www.ptb.de/english/org/4/43/433/disse.htm</A></P> +</BLOCKQUOTE> + +<UL> + <LI>In the UK by National Physical Laboratory (NPL)'s TRUETIME + service. Phone number: 0891 516 333 +</UL> + +<BLOCKQUOTE> + <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> +</BLOCKQUOTE> + +<UL> + <LI>In Italy by Istituto Elettrotecnico Nazionale "Galileo + Ferrais" (IEN)'s CTD service. Phone number: 166 11 46 + 15 +</UL> + +<BLOCKQUOTE> + <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> +</BLOCKQUOTE> + +<UL> + <LI>In Switzerland by Swiss Federal Office of Metrology 's timecode + service. Phone number: 031 323 32 25 +</UL> + +<BLOCKQUOTE> + <P>For more detail, see <A HREF="http://www.ofmet.admin.ch/de/labors/4/Zeitvert.html%20">http://www.ofmet.admin.ch/de/labors/4/Zeitvert.html + </A></P> +</BLOCKQUOTE> + +<UL> + <LI>In Sweden by SP Swedish National Testing and Research Institute + 's timecode service. Phone number: +46 33 415783 +</UL> + +<BLOCKQUOTE> + <P>For more detail, see <A HREF="http://www.sp.se/pne/ElectricalMetrology/ElMeteng/frameset.htm">http://www.sp.se/pne/ElectricalMetrology/ElMeteng/frameset.htm</A><BR> +<BR> + </P> +</BLOCKQUOTE> + +<H4>Fudge Factors</H4> + +<DL> + <DT><TT>time1 <I>time</I></TT> + <DD>Specifies the time offset calibration factor, in seconds + and fraction, with default 0.0. + <DT><TT>time2 <I>time</I></TT> + <DD>Not used by this driver. + <DT><TT>stratum <I>number</I></TT> + <DD>Specifies the driver stratum, in decimal from 0 to 15, with + default 0. + <DT><TT>refid <I>string</I></TT> + <DD>Specifies the driver reference identifier, an ASCII string + from one to four characters, with default PTB. + <DT><TT>flag1 0 | 1</TT> + <DD>Not used by this driver. + <DT><TT>flag2 0 | 1</TT> + <DD>Not used by this driver. + <DT><TT>flag3 0 | 1</TT> + <DD>Not used by this driver. + <DT><TT>flag4 0 | 1</TT> + <DD>Not used by this driver. +</DL> + +<P>Additional Information</P> + +<P>A keyword in the ntp.conf file permits a direct connection +to a serial port of source of time like IEN CTD signal. It is +sufficient to use the string DIRECT in place of the phone number.</P> + +<P>Example:</P> + +<P><FONT FACE="Courier New">server 127.127.23.1</FONT></P> + +<P><FONT FACE="Courier New">phone DIRECT</FONT></P> + +<P><A HREF="refclock.htm">Reference Clock Drivers</A> <HR ALIGN=LEFT></P> + +<ADDRESS>by Marco Mascarello (masca@tf.ien.it) for David L. Mills +(mills@udel.edu)</ADDRESS> + +</BODY> +</HTML> + |