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+<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>KSI/Odetics TPRO/S IRIG Interface
+</TITLE>
+</HEAD>
+<BODY>
+
+<H3>
+KSI/Odetics TPRO/S IRIG Interface</H3>
+
+<HR>
+<H4>
+Synopsis</H4>
+Address: 127.127.12.<I>u</I>
+<BR>Reference ID: <TT>IRIG</TT>
+<BR>Driver ID: <TT>IRIG_TPRO</TT>
+<BR>TPRO Device: <TT>/dev/tpro<I>u</I></TT>
+<BR>Requires: KSI/Odetics device driver, <TT>/usr/include/sys/tpro.h</TT> header file
+<H4>
+Description</H4>
+This driver supports the KSI/Odetics TPRO and TPRO-SAT IRIG-B Decoder,
+which is a module connected directly to the SBus of a Sun workstation.
+The module works with the IRIG-B signal generated by several radio clocks,
+including those made by Arbiter, Austron, Odetics, Spectracom and TrueTime,
+among others, although it is generally an add- on option. In the case of
+the TPRO-SAT, the module is an integral part of a GPS receiver, which serves
+as the primary timing source.
+
+<P>Using the TPRO interface as a NTP reference clock provides precision
+time only to ntpd and its clients. With suitable kernel modifications,
+it is possible to use the TPRO as the CPU system clock, avoiding errors
+introduced by the CPU clock oscillator wander. See the <A HREF="kern.htm">A
+Kernel Model for Precision Timekeeping </A>page for further details.
+<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>IRIG</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>
+Not used by this driver.</DD>
+</DL>
+Additional Information
+
+<P><A HREF="refclock.htm">Reference Clock Drivers</A>&nbsp;
+<HR>
+<ADDRESS>
+David L. Mills (mills@udel.edu)</ADDRESS>
+
+</BODY>
+</HTML>