Hi,

I was wondering if anyone had ever set up a TrueTime GPS-PC card for Linux.  I haven't
been able to find much documentation on how to get this card actually running, so if
anyone can help, please let me know.  Thanks,

Ryan Nelson

Ryan,

If the card is a GPS PCI 2 then you can get the user manual and a data 
sheet from http://www.symmttm.com/products_blt_gps_pci2.asp

This is Symmetricom's new web site for Timing Test and Measurement and 
it has most of the documentation for Symm, Datum and TrueTime products.
Telco products are still on the main Symmetricom site.

dicky.

Nelson, Ryan Lorne wrote:

> Hi,
> 
> I was wondering if anyone had ever set up a TrueTime GPS-PC card for Linux.  I haven't
> been able to find much documentation on how to get this card actually running, so if
> anyone can help, please let me know.  Thanks,
> 
> Ryan Nelson
> 

Hey,

No, the card I have is the ISA version (http://www.truetime.com/DOCSn/gps_pc.pdf).  I
have the manual for it, but i have been unable to figure out a way for Linux to be able
to use it.  The only information I found on it was at
http://www.eecis.udel.edu/~mills/ntp/html/drivers/driver5.html but I am unable to
figure out where to get the driver that it mentions here. 

Any help would be greatly appreciated.

Thanks,

Ryan

Quoting dicky <abuse@hotmail.com>:

> Ryan,
> 
> If the card is a GPS PCI 2 then you can get the user manual and a data 
> sheet from http://www.symmttm.com/products_blt_gps_pci2.asp
> 
> This is Symmetricom's new web site for Timing Test and Measurement and 
> it has most of the documentation for Symm, Datum and TrueTime products.
> Telco products are still on the main Symmetricom site.
> 
> dicky.
> 
> Nelson, Ryan Lorne wrote:
> 
> > Hi,
> > 
> > I was wondering if anyone had ever set up a TrueTime GPS-PC card for Linux.  I
> haven't
> > been able to find much documentation on how to get this card actually running, so
> if
> > anyone can help, please let me know.  Thanks,
> > 
> > Ryan Nelson
> > 
> 
> _______________________________________________
> questions mailing list
> questions@ntp.org
> http://mailman.ntp.org/mailman/listinfo/questions
> 

This is a multi-part message in MIME format.
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The driver for Truetime devices is found in the NTP distribution  
..../ntp-4.2.0/ntpd/refclock_true.c.  The default build for NTP is 
supposed to include the drivers for any refclocks supported on your 
configuration.

At a minimum, try putting the lines:

server 127.127.5.0 prefer
fudge 127.127.5.0 <flags><parameters>....

in your ntp.conf

You'll have to dig into the documentation for anything else you might 
need.  Or you could find someone who knows and ask him!

Nelson, Ryan Lorne wrote:

>Hey,
>
>No, the card I have is the ISA version (http://www.truetime.com/DOCSn/gps_pc.pdf).  I
>have the manual for it, but i have been unable to figure out a way for Linux to be able
>to use it.  The only information I found on it was at
>http://www.eecis.udel.edu/~mills/ntp/html/drivers/driver5.html but I am unable to
>figure out where to get the driver that it mentions here. 
>
>Any help would be greatly appreciated.
>
>Thanks,
>
>Ryan
>
>Quoting dicky <abuse@hotmail.com>:
>
>  
>
>>Ryan,
>>
>>If the card is a GPS PCI 2 then you can get the user manual and a data 
>>sheet from http://www.symmttm.com/products_blt_gps_pci2.asp
>>
>>This is Symmetricom's new web site for Timing Test and Measurement and 
>>it has most of the documentation for Symm, Datum and TrueTime products.
>>Telco products are still on the main Symmetricom site.
>>
>>dicky.
>>
>>Nelson, Ryan Lorne wrote:
>>
>>    
>>
>>>Hi,
>>>
>>>I was wondering if anyone had ever set up a TrueTime GPS-PC card for Linux.  I
>>>      
>>>
>>haven't
>>    
>>
>>>been able to find much documentation on how to get this card actually running, so
>>>      
>>>
>>if
>>    
>>
>>>anyone can help, please let me know.  Thanks,
>>>
>>>Ryan Nelson
>>>
>>>      
>>>
>>_______________________________________________
>>questions mailing list
>>questions@ntp.org
>>http://mailman.ntp.org/mailman/listinfo/questions
>>
>>    
>>
>
>
>  
>

--------------010704000500040103070307
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Content-Transfer-Encoding: 7bit

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
  <meta http-equiv="Content-Type" content="text/html;charset=ISO-8859-1">
  <title></title>
</head>
<body text="#000000" bgcolor="#ffffff">
The driver for Truetime devices is found in the NTP distribution&nbsp;
..../ntp-4.2.0/ntpd/refclock_true.c.&nbsp; The default build for NTP is
supposed to include the drivers for any refclocks supported on your
configuration.<br>
<br>
At a minimum, try putting the lines:<br>
<br>
server 127.127.5.0 prefer <br>
fudge 127.127.5.0 &lt;flags&gt;&lt;parameters&gt;....<br>
<br>
in your ntp.conf<br>
<br>
You'll have to dig into the documentation for anything else you might
need.&nbsp; Or you could find someone who knows and ask him!<br>
<br>
Nelson, Ryan Lorne wrote:<br>
<blockquote type="cite"
 cite="midmailman.67.1075387906.1757.questions@ntp.org">
  <pre wrap="">Hey,

No, the card I have is the ISA version (<a class="moz-txt-link-freetext" href="http://www.truetime.com/DOCSn/gps_pc.pdf">http://www.truetime.com/DOCSn/gps_pc.pdf</a>).  I
have the manual for it, but i have been unable to figure out a way for Linux to be able
to use it.  The only information I found on it was at
<a class="moz-txt-link-freetext" href="http://www.eecis.udel.edu/~mills/ntp/html/drivers/driver5.html">http://www.eecis.udel.edu/~mills/ntp/html/drivers/driver5.html</a> but I am unable to
figure out where to get the driver that it mentions here. 

Any help would be greatly appreciated.

Thanks,

Ryan

Quoting dicky <a class="moz-txt-link-rfc2396E" href="mailto:abuse@hotmail.com">&lt;abuse@hotmail.com&gt;</a>:

  </pre>
  <blockquote type="cite">
    <pre wrap="">Ryan,

If the card is a GPS PCI 2 then you can get the user manual and a data 
sheet from <a class="moz-txt-link-freetext" href="http://www.symmttm.com/products_blt_gps_pci2.asp">http://www.symmttm.com/products_blt_gps_pci2.asp</a>

This is Symmetricom's new web site for Timing Test and Measurement and 
it has most of the documentation for Symm, Datum and TrueTime products.
Telco products are still on the main Symmetricom site.

dicky.

Nelson, Ryan Lorne wrote:

    </pre>
    <blockquote type="cite">
      <pre wrap="">Hi,

I was wondering if anyone had ever set up a TrueTime GPS-PC card for Linux.  I
      </pre>
    </blockquote>
    <pre wrap="">haven't
    </pre>
    <blockquote type="cite">
      <pre wrap="">been able to find much documentation on how to get this card actually running, so
      </pre>
    </blockquote>
    <pre wrap="">if
    </pre>
    <blockquote type="cite">
      <pre wrap="">anyone can help, please let me know.  Thanks,

Ryan Nelson

      </pre>
    </blockquote>
    <pre wrap="">_______________________________________________
questions mailing list
<a class="moz-txt-link-abbreviated" href="mailto:questions@ntp.org">questions@ntp.org</a>
<a class="moz-txt-link-freetext" href="http://mailman.ntp.org/mailman/listinfo/questions">http://mailman.ntp.org/mailman/listinfo/questions</a>

    </pre>
  </blockquote>
  <pre wrap=""><!---->

  </pre>
</blockquote>
</body>
</html>

--------------010704000500040103070307--

I have been looking at this issue also.  This is what I think is
correct.  I would appreciate a correction from anyone who can point
to appropriate documentation that more clearly answers the question
posed.

Unfortunately, I believe that the "drivers" in the ntp distribution
are drivers that load into the application itself.  The TrueTime
driver appears to presume that the true time "GPS" receiver is one
with a serial line output.  The linux kernel already has drivers
that operate the serial line and feed the bytes to the application
so that the ntpd application driver merely needs to parse the
byte string into an appropriate time stamp.

In the case of an ISA or PCI card, I presume that a Linux kernel
driver is needed as well.  This would allow the "application
level driver" in ntpd to "open" a special character device and
obtain the timestamp as bytes (probably binary) read directly
via the I/O bus, no through a serial port.

John DeDourek

"Richard B. Gilbert" wrote:
> 
>    Part 1.1    Type: Plain Text (text/plain)
>            Encoding: 7bit

John,

As you might know, TrueTime was devoured by Symmetricom, although it
seems they will continue to market the NTS-200 at least. TrueTime used
to make (and maybe Symmetricom still does) a GPS receiver with serial
output (type 5). What you may have is the TrueTime TT560 GPS/IRIG PCI
card, which uses a different driver (type 41). I have not tested any of
these.

Dave

John DeDourek wrote:
> 
> I have been looking at this issue also.  This is what I think is
> correct.  I would appreciate a correction from anyone who can point
> to appropriate documentation that more clearly answers the question
> posed.
> 
> Unfortunately, I believe that the "drivers" in the ntp distribution
> are drivers that load into the application itself.  The TrueTime
> driver appears to presume that the true time "GPS" receiver is one
> with a serial line output.  The linux kernel already has drivers
> that operate the serial line and feed the bytes to the application
> so that the ntpd application driver merely needs to parse the
> byte string into an appropriate time stamp.
> 
> In the case of an ISA or PCI card, I presume that a Linux kernel
> driver is needed as well.  This would allow the "application
> level driver" in ntpd to "open" a special character device and
> obtain the timestamp as bytes (probably binary) read directly
> via the I/O bus, no through a serial port.
> 
> John DeDourek
> 
> "Richard B. Gilbert" wrote:
> >
> >    Part 1.1    Type: Plain Text (text/plain)
> >            Encoding: 7bit