19c2daa00SOllivier Robert<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 29c2daa00SOllivier Robert<html> 39c2daa00SOllivier Robert<head> 49c2daa00SOllivier Robert<meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"> 59c2daa00SOllivier Robert<meta name="GENERATOR" content="Mozilla/4.01 [en] (Win95; I) [Netscape]"> 69c2daa00SOllivier Robert<title>KSI/Odetics TPRO/S IRIG Interface</title> 7ea906c41SOllivier Robert<link href="scripts/style.css" type="text/css" rel="stylesheet"> 89c2daa00SOllivier Robert</head> 99c2daa00SOllivier Robert<body> 109c2daa00SOllivier Robert<h3>KSI/Odetics TPRO/S IRIG Interface</h3> 11*2b15cb3dSCy Schubert<p>Author: David L. Mills (mills@udel.edu)<br> 12*2b15cb3dSCy Schubert Last update: 13*2b15cb3dSCy Schubert <!-- #BeginDate format:En2m -->11-Sep-2010 05:56<!-- #EndDate --> 14*2b15cb3dSCy Schubert UTC</p> 159c2daa00SOllivier Robert<hr> 169c2daa00SOllivier Robert<h4>Synopsis</h4> 179c2daa00SOllivier Robert<p>Address: 127.127.12.<i>u</i><br> 189c2daa00SOllivier Robert Reference ID: <tt>IRIG</tt><br> 199c2daa00SOllivier Robert Driver ID: <tt>IRIG_TPRO</tt><br> 209c2daa00SOllivier Robert TPRO Device: <tt>/dev/tpro<i>u</i></tt><br> 219c2daa00SOllivier Robert Requires: KSI/Odetics device driver, <tt>/usr/include/sys/tpro.h</tt> header file</p> 229c2daa00SOllivier Robert<h4>Description</h4> 239c2daa00SOllivier Robert<p>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> 249c2daa00SOllivier Robert<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.html">A Kernel Model for Precision Timekeeping </a>page for further details.</p> 259c2daa00SOllivier Robert<h4>Fudge Factors</h4> 269c2daa00SOllivier Robert<dl> 27*2b15cb3dSCy Schubert <dt><tt>time1 <i>time</i></tt></dt> 28*2b15cb3dSCy Schubert <dd>Specifies the time offset calibration factor, in seconds and fraction, with default 0.0.</dd> 29*2b15cb3dSCy Schubert <dt><tt>time2 <i>time</i></tt></dt> 30*2b15cb3dSCy Schubert <dd>Not used by this driver.</dd> 31*2b15cb3dSCy Schubert <dt><tt>stratum <i>number</i></tt></dt> 32*2b15cb3dSCy Schubert <dd>Specifies the driver stratum, in decimal from 0 to 15, with default 0.</dd> 33*2b15cb3dSCy Schubert <dt><tt>refid <i>string</i></tt></dt> 34*2b15cb3dSCy Schubert <dd>Specifies the driver reference identifier, an ASCII string from one to four characters, with default <tt>IRIG</tt>.</dd> 35*2b15cb3dSCy Schubert <dt><tt>flag1 0 | 1</tt></dt> 36*2b15cb3dSCy Schubert <dd>Not used by this driver.</dd> 37*2b15cb3dSCy Schubert <dt><tt>flag2 0 | 1</tt></dt> 38*2b15cb3dSCy Schubert <dd>Not used by this driver.</dd> 39*2b15cb3dSCy Schubert <dt><tt>flag3 0 | 1</tt></dt> 40*2b15cb3dSCy Schubert <dd>Not used by this driver.</dd> 41*2b15cb3dSCy Schubert <dt><tt>flag4 0 | 1</tt></dt> 42*2b15cb3dSCy Schubert <dd>Not used by this driver.</dd> 439c2daa00SOllivier Robert</dl> 449c2daa00SOllivier Robert<h4>Additional Information</h4> 459c2daa00SOllivier Robert<p><a href="../refclock.html">Reference Clock Drivers</a></p> 469c2daa00SOllivier Robert<hr> 47ea906c41SOllivier Robert<script type="text/javascript" language="javascript" src="scripts/footer.txt"></script> 489c2daa00SOllivier Robert</body> 499c2daa00SOllivier Robert</html> 50