Line Locked
Line Locked – a) The sync pulses of cameras are locked to the AC mains frequency. b) In CCTV, this usually refers to multiple cameras being powered by a common alternating current (AC) source (either 24 VAC, 110 VAC or 240 VAC) and consequently have field frequencies locked to the same AC source frequency (50 Hz in CCIR systems and 60 Hz in EIA systems).
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