Keeping Time with NTP by Tom Van Looy

The Network Time Protocol (NTP) is a protocol for synchronizing the clocks of computer systems over packet-switched, variable-latency data networks. NTP uses UDP port 123 as its transport layer. It is designed particularly to resist the effects of variable latency (jitter buffer)...

http://www.itjungle.com/fhg/fhg062508-story01.html
The above link may require a free, or paid, registration to view the article.

[report a broken link by clicking here]