The technology was later described in the 1981 Internet Engineering Note (IEN) 173 and a public protocol was developed from it that was documented in RFC 778. In 1979, network time synchronization technology was used in what was possibly the first public demonstration of Internet services running over a trans-Atlantic satellite network, at the National Computer Conference in New York. The current protocol is version 4 (NTPv4), which is backward compatible with version 3. NTP supplies a warning of any impending leap second adjustment, but no information about local time zones or daylight saving time is transmitted. : 16 They can also use broadcasting or multicasting, where clients passively listen to time updates after an initial round-trip calibrating exchange. : 20 Implementations send and receive timestamps using the User Datagram Protocol (UDP) on port number 123. The protocol is usually described in terms of a client–server model, but can as easily be used in peer-to-peer relationships where both peers consider the other to be a potential time source. Asymmetric routes and network congestion can cause errors of 100 ms or more. NTP can usually maintain time to within tens of milliseconds over the public Internet, and can achieve better than one millisecond accuracy in local area networks under ideal conditions. : 3 It uses the intersection algorithm, a modified version of Marzullo's algorithm, to select accurate time servers and is designed to mitigate the effects of variable network latency. NTP is intended to synchronize all participating computers to within a few milliseconds of Coordinated Universal Time (UTC). In operation since before 1985, NTP is one of the oldest Internet protocols in current use. Each timecode result consists of three elements: the timecode, the timecode's FPS, and the timecode's frame count.The Network Time Protocol ( NTP) is a networking protocol for clock synchronization between computer systems over packet-switched, variable- latency data networks. If you want to reset your calculation, click the reset button named RESET. To copy your result to the clipboard, just hit the button COPY. On the occasion of an error, there will be some information in the result section pointing to that error. Therefore, timecodes you convert into shall never exceed 23:59:59:FF, where FF stands for the frames corresponding to your chosen FPS rate. If you convert your input timecode into a timecode with a lower FPS rate and your output timecode reaches the 24 hours mark, the resulting output timecode will be wrong. If you convert from a timecode with a higher FPS to a lower FPS, your timecode gets longer and shorter if you do the opposite. "Frame-Preserving" keeps the original frame count intact, which may change the time duration. Duration-Preserving aims to maintain the original duration during frame rate conversion, with minor time length variations due to frame rounding. TC Convert offers two conversion modes: Duration-Preserving (default) and Frame-Preserving. You can either type the timecode you want to convert in or paste it from the clipboard into the timecode field of TC Convert. TC Convert produces SMPTE-conform timecodes. You then can input a timecode with an FPS corresponding to the input frame rate. To use TC Convert, you first choose an input frame rate and second an output frame rate. It converts a timecode with a given frame rate into another timecode with a different frame rate. TC Convert is a frame rate conversion calculator.
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