C-Jam or Continuous Jam is a sophisticated software algorithm developed by Ambient that is used to keep Lockit timecode generators 100% accurate via our wireless network ACN, even over very long periods of time. With C-Jam enabled you can run virtually forever with an accuracy of 0.0ppm!
In order to use C-Jam it is sufficient to enable it on one Lockit (any Lockit on set can do that but usually you would use the Lockit on the sound cart). This unit now serves as C-Jam "master" and supplies all further Lockits on Set with an accurate timestamp every six seconds. No further adjustments are necessary. Which makes C-Jam incredibly easy to use.
As soon as you enable C-Jam in your ACN network, all Lockit devices on set will monitor their oscillator speeds in real-time, compare it to the incoming "master time stamp" and make adjustments as necessary to eliminate the last bit of drift.
Since even in C-Jam mode every unit still uses its own VCO (voltage controlled oscillator) to generate timecode (and sync), they don't necessarily have always to be in range of the C-Jam master to be accurate.
Any unit can leave the C-Jam network and re-enter it any time and still stay accurate the whole time. This also means that Lockits that are powered up at a later point of time will automatically enter the C-Jam network and set their timecode accordingly.