ntp-refclock 1:4.2.0a-11ubuntu3 (ia64 binary) in ubuntu hoary

Network Time Protocol: daemon for reference clocks
 NTP, the Network Time Protocol, is used to keep computer clocks accurate
 over the Internet, or by following an accurate hardware receiver which
 interprets GPS, DCF-77, NIST or similar time signals.
 .
 This version of the ntp daemon can understand a variety of time signal
 receivers. If you do not have a radio clock, use the ntp-simple package
 instead, as it consumes far less memory.
 .
 If you're serious about building a high-quality stratum 1 timekeeper, please
 take a look at Ulrich Windl's PPSkit patchset for the Linux kernel, available
 from the kernel.org mirror network in pub/linux/daemons/ntp.