Watchdog Changeover Unit User Guide - Trilogy Communications

Trilogy Communications LimitedWatchdog3.3 MONITORINGThe fail conditions for each input signal type are described in the following sections. When a failcondition is detected it is reported via the Statesman GUI and indicated by Status LEDs on the edge ofthe board.3.3.1 Black and BurstThe 370-10-00 is able to detect both PAL and NTSC black and burst signals.The following conditions will cause a fail indication:Input level error:o If the sync level of the applied input signal is 500 mV. It will indicate a failure for unterminatedsignals.If the line frequency is not within 4% of the line frequency based on an internal oscillator.The presence of the burst is detected. When the burst amplitude is less than 10% of the peakto peak specification, a “fail” condition is indicated.3.3.2 Tri-Level-SyncThe 370-10-00 can detect the following TLS standards:1920x1080/60/p1920x1080/59.94/p1920x1080/50/p1920x1080/60/i1920x1080/59.94/i1920x1080/50/i1920x1080/30/p1920x1080/29.97/p1920x1080/25/p1920x1080/24/p1920x1080/23.98/p1920x1080/30/sF1920x1080/29.97/sF1920x1080/25/sF1920x1080/24/sF1920x1080/23.98/sF1280x720/60/p1280x720/59.94/p1280x720/50/p1280x720/30/p1280x720/29.97/p1280x720/25/p1280x720/24/p1280x720/23.98/pThe standard detected is reported via the Statesman GUI.The following conditions will cause a fail indication:Input level error:o If the sync level of the applied input signal is 500 mV. It will indicate a failure for unterminatedsignals.The line frequency is not within 4% of the line frequency based on an internal oscillator.The frame frequency is not within 0.5% of the standard detected. For some standards it ispossible the wrong standard will be detected if outside of this specification.User Guide Issue 1.00 Page 11 of 28