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