Software Drivers
|
Software Drivers
To Use with Praecis Ct
To turn your existing server into a Stratum 1 network time server you need the
Praecis Ct and existing, public-domain NTP software and drivers available for Unix, Linux,
Solaris and Windows NT platforms. A Stratum 1 network time server is a networked
computer connected to an external source of accurate time, such as Praecis Ct.
The computer synchronizes its clock to the external source of time and provides
accurate time-of-day information to the clients on the network. The Network
Time Protocol (NTP) was developed by Dr.
David Mills and is freely distributed at the
official NTP web site:
www.ntp.org/index.html
Go to www.eecis.udel.edu/~ntp/ntp_spool/html/refclock.html
to see a list of all external reference clocks with existing NTP driver
support. The Praecis Ct outputs an ASCII time-of-day message string
on the serial port once per second. It can easily be configured to
mimic the string format of several different reference clocks with existing
drivers. Clock choices available are: TrueTime, Trimble Palisade,
and Spectracom. These drivers are available for
Unix, Linux and Solaris platforms. Simply configure the Praecis Ct to
mimic the clock of your choice, and then download and compile a recent release
of the NTP distribution which includes the reference clock drivers.
At the NTP Public Services Project there is help which describes the steps
needed to set up a Praecis Ct as a refclock on FreeBSD/Linux/Unix. Go to
ntp.isc.org for "Installing
an EndRun Praecis Ct CDMA Based Refclock".
For the utmost precision on the Windows NT/2000 platform, the Praecis Ct is
compatible with the Trimble Palisade driver for use with the NTP distribution.
In this mode, the Praecis Ct timetags the assertion of the
RTS handshaking signal sent by the Windows NT/2000 machine and returns the timetag in
a format that is compatible with the Trimble Palisade driver. For a compiled
version of the NTP gui install for NT go to
www.five-ten-sg.com.
There is a low-cost alternative to NTP for Windows NT users. The timeserv
application is distributed with the Windows NT 4.0 Resource Kit and is
compatible with the ASCII time-of-day message formats output by the Praecis Ct.
Documentation for TimeServ is available at
www.niceties.TimeServ.html.nna and yet attain a frequency standard that is as stable as
with GPS.
|
|
