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diff --git a/contrib/ntp/html/driver11.htm b/contrib/ntp/html/driver11.htm deleted file mode 100644 index 6e5dd7a..0000000 --- a/contrib/ntp/html/driver11.htm +++ /dev/null @@ -1,150 +0,0 @@ -<HTML> -<HEAD> - <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> - <META NAME="GENERATOR" CONTENT="Mozilla/4.01 [en] (Win95; I) [Netscape]"> - <TITLE>Arbiter 1088A/B GPS Receiver -</TITLE> -</HEAD> -<BODY> - -<H3> -Arbiter 1088A/B GPS Receiver</H3> - -<HR> -<H4> -Synopsis</H4> -Address: 127.127.11.<I>u</I> -<BR>Reference ID: <TT>GPS</TT> -<BR>Driver ID: <TT>GPS_ARBITER</TT> -<BR>Serial Port: <TT>/dev/gps<I>u</I></TT>; 9600 baud, 8-bits, no parity -<BR>Features: <TT>tty_clk</TT> -<H4> -Description</H4> -This driver supports the Arbiter 1088A/B Satellite Controlled Clock. The -claimed accuracy of this clock is 100 ns relative to the PPS output when -receiving four or more satellites. - -<P>The receiver should be configured before starting the NTP daemon, in -order to establish reliable position and operating conditions. It does -not initiate surveying or hold mode. For use with NTP, the daylight savings -time feature should be disables (<TT>D0</TT> command) and the broadcast -mode set to operate in UTC (<TT>BU</TT> command). - -<P>The timecode format supported by this driver is selected by the poll -sequence <TT>B5</TT>, which initiates a line in the following format to -be repeated once per second until turned off by the <TT>B0</TT> command. - -<P>Format <TT>B5</TT> (24 ASCII printing characters): -<PRE><cr><lf>i yy ddd hh:mm:ss.000bbb - -on-time = <cr> -i = synchronization flag (' ' = locked, '?' = unlocked) -yy = year of century -ddd = day of year -hh:mm:ss = hours, minutes, seconds -.000 = fraction of second (not used) -bbb = tailing spaces for fill</PRE> -The alarm condition is indicated by a '?' at i, which indicates the receiver -is not synchronized. In normal operation, a line consisting of the timecode -followed by the time quality character (TQ) followed by the receiver status -string (SR) is written to the clockstats file. - -<P>The time quality character is encoded in IEEE P1344 standard: - -<P>Format <TT>TQ</TT> (IEEE P1344 estimated worst-case time quality) -<PRE>0 clock locked, maximum accuracy -F clock failure, time not reliable -4 clock unlocked, accuracy < 1 us -5 clock unlocked, accuracy < 10 us -6 clock unlocked, accuracy < 100 us -7 clock unlocked, accuracy < 1 ms -8 clock unlocked, accuracy < 10 ms -9 clock unlocked, accuracy < 100 ms -A clock unlocked, accuracy < 1 s -B clock unlocked, accuracy < 10 s</PRE> -The status string is encoded as follows: - -<P>Format <TT>SR</TT> (25 ASCII printing characters) -<PRE>V=vv S=ss T=t P=pdop E=ee - -vv = satellites visible -ss = relative signal strength -t = satellites tracked -pdop = position dilution of precision (meters) -ee = hardware errors</PRE> -A three-stage median filter is used to reduce jitter and provide a dispersion -measure. The driver makes no attempt to correct for the intrinsic jitter -of the radio itself. -<H4> -Monitor Data</H4> -When enabled by the <TT>flag4</TT> fudge flag, an additional line containing -the latitude, longitude, elevation and optional deviation data is written -to the <TT>clockstats</TT> file. The deviation data operates with an external -pulse-per-second (PPS) input, such as a cesium oscillator or another radio -clock. The PPS input should be connected to the B event channel and the -radio initialized for deviation data on that channel. The deviation data -consists of the mean offset and standard deviation of the external PPS -signal relative the GPS signal, both in microseconds over the last 16 seconds. -<H4> -Fudge Factors</H4> - -<DL> -<DT> -<TT>time1 <I>time</I></TT></DT> - -<DD> -Specifies the time offset calibration factor, in seconds and fraction, -with default 0.0.</DD> - -<DT> -<TT>time2 <I>time</I></TT></DT> - -<DD> -Not used by this driver.</DD> - -<DT> -<TT>stratum <I>number</I></TT></DT> - -<DD> -Specifies the driver stratum, in decimal from 0 to 15, with default 0.</DD> - -<DT> -<TT>refid <I>string</I></TT></DT> - -<DD> -Specifies the driver reference identifier, an ASCII string from one to -four characters, with default <TT>GPS</TT>.</DD> - -<DT> -<TT>flag1 0 | 1</TT></DT> - -<DD> -Not used by this driver.</DD> - -<DT> -<TT>flag2 0 | 1</TT></DT> - -<DD> -Not used by this driver.</DD> - -<DT> -<TT>flag3 0 | 1</TT></DT> - -<DD> -Not used by this driver.</DD> - -<DT> -<TT>flag4 0 | 1</TT></DT> - -<DD> -Enable verbose <TT>clockstats</TT> recording if set.</DD> -</DL> -Additional Information - -<P><A HREF="refclock.htm">Reference Clock Drivers</A> -<HR> -<ADDRESS> -David L. Mills (mills@udel.edu)</ADDRESS> - -</BODY> -</HTML> |
