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diff --git a/contrib/ntp/html/driver43.htm b/contrib/ntp/html/driver43.htm new file mode 100644 index 0000000..fc994ef --- /dev/null +++ b/contrib/ntp/html/driver43.htm @@ -0,0 +1,109 @@ +<html> +<head> +<title>RIPE NCC interface for Trimble Palisade</title> +</head> +<body> +<h3>RIPE NCC interface for Trimble Palisade</h3> + +<hr> + +<img src="pic/driver43_2.jpg" alt="Trimble Acutime 2000" align="right"> + +<h4>Synopsis</h4> + +Address: 127.127.43.<i>u</i> <br> +Reference ID: <tt>RIPENCC</tt> <br> +Driver ID: <tt>RIPENCC</tt> + +<h4>Description</h4> + +<p> This is a special driver developed to be used in conjuction with the +RIPE NCC clock card in the RIPE NCC Test Traffic Measurements project. +</p> + +<h4>Why this driver?</h4> + +<p> +The reason why we created a seperated driver for an antenna for which +already a (vendor supplied) driver exist is a design decision. +To be more specific, the standard Trimble interface uses a 12 pin +connector. The cable sold by Trimble to connect to this wire is a very +thick cable. Certainly not something you wish to run for several 100 +meters through your building. And if you wanted to run it for 100 meters, +you always would have to really run the cable, and didn't have the option +to use existing wiring.<br> +This is where we wanted more flexibility. We wanted to be able to use +existing wiring in buildings. That leaded us to CAT-5(UTP) which only +gives us 8 wires. Therefor we decided to redesing the use of the Trimble +antenna. The Trimble supports two modes: EVENT driver and PPS mode. The +default is to use the EVENT mode which needs all 12 wires. We only use the +PPS timestamps for which we have enough with 8 wires. For our purposes +this is more than fine. +</p> + +More information about the project can be found on the <a href="http://www.ripe.net/test-traffic" TARGET=_new>Test Traffic Measurements</a> website. + +<img src="pic/driver43_1.gif" alt="RIPE NCC clock card" align="right"> +<h4> RIPE NCC clock card</h4> + +<p>The card is very a simple PCI card. The only feature on the bus it uses +is the power supply. It uses this power supply to power the Trimble GPS +antenna.</p> + +<p>The card basicly just is a RS422 to RS232 converter. It gets the +Trimble's RS422 signal on a RJ45 connector and transforms that to RS232 on a +DIN9 connector. This connector should be loopbacked on the back of the +machine to the serial port. As said, the card doesn't do any PCI data +transfers.</p> + +<p>The schematics of the interface card is available here: <a +href="http://www.ripe.net/ripencc/mem-services/ttm/Documents/gps_interface_schematic.pdf">gps_interface_schematic.pdf</a>. +You are free to create this card yourself as long as you give some credit +or reference to us. Note that we don't sell these cards on a commercial +basis, but for interested parties we do have some spares to share.<p> + + +<h4>Monitor Data</h4> + +In the <tt>filegen clockstats</tt> file the following (example) data is +collected: +<pre> +52445 41931.275 127.127.40.0 U1 20.6.2002 11:38:51 13 11 +52445 41931.395 127.127.40.0 C1 20062002 113851 6 364785 110.2 450 6.7 13 5222.374737 N 0453.268013 E 48 7 11 0 1 -14 20 0 -25 +52445 41931.465 127.127.40.0 S1 07 1 1 02 59.3 291.5 39.3 +52445 41931.485 127.127.40.0 S1 11 2 1 02 59.9 138.0 60.2 +52445 41931.525 127.127.40.0 S1 01 4 1 02 48.4 185.7 28.3 +52445 41931.555 127.127.40.0 S1 14 5 2 02 32.7 41.0 15.4 +52445 41931.585 127.127.40.0 S1 20 6 1 02 59.9 256.6 78.0 +52445 41931.615 127.127.40.0 S1 25 8 2 00 0.0 86.6 20.1 +</pre> +This is in the form of: +<pre> +All output lines consist of a prefix and a message, the prefix is: +[days since epoch] [sec.ms since start of day] [peer address] + +And all individual messages: + +*Primary UTC time packet: +U1 [date] [time] [trackstat] [utcflags] + +*Comprehensive time packet: +C1 [date] [time] [mode] [bias] [biasunc] [rate] [rateunc] [utcoff] [latitude] [longtitude] [alt] [vis sat](x8) + +*Tracking status packet: +S1 [prn] [channel] [aqflag] [ephstat] [snr] [azinuth] [elevation] +</pre> + +<h4>Additional Information</h4> + +<a href="refclock.htm">Reference Clock Drivers</a> + + +<hr> +<a href="index.htm"><img align="left" src="pic/home.gif" alt= +"Home"></a> + +<address><a href="mailto:marks@ripe.net">Mark Santcroos +<marks@ripe.net></a></address> +</body> +</html> |
