Did you mistype NTP in your subject line, or is SNTP some alternative time protocol?

From http://www.faqs.org/rfcs/rfc2030.html

SNTP can be used when the ultimate performance of the full NTP implementation described in RFC 1305 is not needed or justified. When operating with current and previous NTP and SNTP versions, SNTP Version 4 involves no changes to the NTP specification or known implementations, but rather a clarification of certain design features of NTP which allow operation in a simple, stateless remote-procedure call (RPC) mode with accuracy and reliability expectations similar to the UDP/TIME protocol described in RFC-868.