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="HTML Tidy, see www.w3.org"> 69c2daa00SOllivier Robert<title>Undisciplined Local Clock</title> 79c2daa00SOllivier Robert<link href="scripts/style.css" type="text/css" rel="stylesheet"> 89c2daa00SOllivier Robert</head> 99c2daa00SOllivier Robert<body> 109c2daa00SOllivier Robert<h3>Undisciplined Local Clock</h3> 119c2daa00SOllivier Robert<p>Author: David L. Mills (mills@udel.edu)<br> 129c2daa00SOllivier RobertLast update: 139c2daa00SOllivier Robert <!-- #BeginDate format:En2m -->9-May-2014 08:34<!-- #EndDate --> 149c2daa00SOllivier Robert UTC</p> 159c2daa00SOllivier Robert<hr> 169c2daa00SOllivier Robert<h4>Synopsis</h4> 179c2daa00SOllivier Robert<p>Address: 127.127.1.<i>u</i><br> 189c2daa00SOllivier Robert Reference ID: <tt>LOCL</tt><br> 199c2daa00SOllivier Robert Driver ID: <tt>LOCAL</tt></p> 209c2daa00SOllivier Robert<h4>Description</h4> 219c2daa00SOllivier Robert<p>Note: <strong>We recommend against using this driver.</strong> A much more flexible replacement is described on the <a href="../orphan.html">Orphan Mode</a> page.</p> 229c2daa00SOllivier Robert<p>This driver was intended for use in an isolated network where no external source of synchronization such as a radio clock or modem is available. It allows a designated time server to act as a primary server to provide synchronization to other clients on the network. Pick a machine that has a good clock oscillator and configure it with this driver. Set the clock using the best means available, like eyeball-and-wristwatch. Then, point all the other machines at this one or use broadcast mode to distribute time.</p> 239c2daa00SOllivier Robert<p>Another application for this driver is if a particular server clock is to be used as the clock of last resort when all other normal synchronization sources have gone away. This is especially useful if that server has an ovenized oscillator. For this you would usually, but not necessarily, configure this driver at a stratum greater than any other likely sources of time, such as the default 5 for this driver, to prevent this driver taking over when legitimate sources elsewhere in the network are available. To further protect the Internet infrastructure from accidental or malicious exposure to this driver, the driver is disabled if another source is available and operating.</p> 249c2daa00SOllivier Robert<h4>Monitor Data</h4> 259c2daa00SOllivier Robert<p>No <tt>filegen clockstats</tt> monitor data are produced by this driver.</p> 269c2daa00SOllivier Robert<h4>Fudge Factors</h4> 279c2daa00SOllivier Robert<dl> 289c2daa00SOllivier Robert <dt><tt>time1 <i>time</i></tt></dt> 299c2daa00SOllivier Robert <dd>Specifies the time offset calibration factor, in seconds and fraction, with default 0.0.</dd> 309c2daa00SOllivier Robert <dt><tt>time2 <i>time</i></tt></dt> 319c2daa00SOllivier Robert <dd>Specifies the frequency offset calibration factor, in parts per million, with default 0.0.</dd> 329c2daa00SOllivier Robert <dt><tt>stratum <i>number</i></tt></dt> 339c2daa00SOllivier Robert <dd>Specifies the driver stratum, in decimal from 0 to 15, with default 5.</dd> 349c2daa00SOllivier Robert <dt><tt>refid <i>string</i></tt></dt> 359c2daa00SOllivier Robert <dd>Specifies the driver reference identifier, an ASCII string from one to four characters, with default <tt>LOCL</tt>.</dd> 369c2daa00SOllivier Robert <dt><tt>flag1 0 | 1</tt></dt> 379c2daa00SOllivier Robert <dd>Not used by this driver.</dd> 389c2daa00SOllivier Robert <dt><tt>flag2 0 | 1</tt></dt> 399c2daa00SOllivier Robert <dd>Not used by this driver.</dd> 409c2daa00SOllivier Robert <dt><tt>flag3 0 | 1</tt></dt> 419c2daa00SOllivier Robert <dd>Not used by this driver.</dd> 429c2daa00SOllivier Robert <dt><tt>flag4 0 | 1</tt></dt> 439c2daa00SOllivier Robert <dd>Not used by this driver.</dd> 449c2daa00SOllivier Robert</dl> 459c2daa00SOllivier Robert<h4>Additional Information</h4> 469c2daa00SOllivier Robert<p><a href="../refclock.html">Reference Clock Drivers</a></p> 479c2daa00SOllivier Robert<hr> 489c2daa00SOllivier Robert<script type="text/javascript" language="javascript" src="scripts/footer.txt"></script> 499c2daa00SOllivier Robert</body> 509c2daa00SOllivier Robert</html> 519c2daa00SOllivier Robert