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5   <TITLE>KSI/Odetics TPRO/S IRIG Interface
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7</HEAD>
8<BODY>
9
10<H3>
11KSI/Odetics TPRO/S IRIG Interface</H3>
12
13<HR>
14<H4>
15Synopsis</H4>
16Address: 127.127.12.<I>u</I>
17<BR>Reference ID: <TT>IRIG</TT>
18<BR>Driver ID: <TT>IRIG_TPRO</TT>
19<BR>TPRO Device: <TT>/dev/tpro<I>u</I></TT>
20<BR>Requires: KSI/Odetics device driver, <TT>/usr/include/sys/tpro.h</TT> header file
21<H4>
22Description</H4>
23This driver supports the KSI/Odetics TPRO and TPRO-SAT IRIG-B Decoder,
24which is a module connected directly to the SBus of a Sun workstation.
25The module works with the IRIG-B signal generated by several radio clocks,
26including those made by Arbiter, Austron, Odetics, Spectracom and TrueTime,
27among others, although it is generally an add- on option. In the case of
28the TPRO-SAT, the module is an integral part of a GPS receiver, which serves
29as the primary timing source.
30
31<P>Using the TPRO interface as a NTP reference clock provides precision
32time only to ntpd and its clients. With suitable kernel modifications,
33it is possible to use the TPRO as the CPU system clock, avoiding errors
34introduced by the CPU clock oscillator wander. See the <A HREF="kern.htm">A
35Kernel Model for Precision Timekeeping </A>page for further details.
36<H4>
37Fudge Factors</H4>
38
39<DL>
40<DT>
41<TT>time1 <I>time</I></TT></DT>
42
43<DD>
44Specifies the time offset calibration factor, in seconds and fraction,
45with default 0.0.</DD>
46
47<DT>
48<TT>time2 <I>time</I></TT></DT>
49
50<DD>
51Not used by this driver.</DD>
52
53<DT>
54<TT>stratum <I>number</I></TT></DT>
55
56<DD>
57Specifies the driver stratum, in decimal from 0 to 15, with default 0.</DD>
58
59<DT>
60<TT>refid <I>string</I></TT></DT>
61
62<DD>
63Specifies the driver reference identifier, an ASCII string from one to
64four characters, with default <TT>IRIG</TT>.</DD>
65
66<DT>
67<TT>flag1 0 | 1</TT></DT>
68
69<DD>
70Not used by this driver.</DD>
71
72<DT>
73<TT>flag2 0 | 1</TT></DT>
74
75<DD>
76Not used by this driver.</DD>
77
78<DT>
79<TT>flag3 0 | 1</TT></DT>
80
81<DD>
82Not used by this driver.</DD>
83
84<DT>
85<TT>flag4 0 | 1</TT></DT>
86
87<DD>
88Not used by this driver.</DD>
89</DL>
90Additional Information
91
92<P><A HREF="refclock.htm">Reference Clock Drivers</A>&nbsp;
93<HR>
94<ADDRESS>
95David L. Mills (mills@udel.edu)</ADDRESS>
96
97</BODY>
98</HTML>
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