Repetitive electrical impulse noise consists of short bursts of electromagnetic interference occurring at regular intervals, often tied to the mains power frequency. It severely degrades copper-based broadband connections, causing high error rates or complete loss of synchronization. Locating the source usually requires a directional radio receiver or spectrum analyzer.
Heard on the job
The customer's broadband drops exactly at dusk every day, so I suspect REIN from a faulty streetlamp.