[Malsua]

>>>I cannot find that acronym anywhere except in links to this story

I find your search skills, lacking :)

https://support.zen.co.uk/kb/Knowledgebase/Broadband-Understanding-REIN-and-SHINE

http://www.equicom.hu/wp-content/uploads/EXFO_anote303_Capturing-and-Analyzing-Impulse-Noise_en.pdf

https://jaguartelecom.zendesk.com/hc/en-us/articles/360007586634-REIN-Repetitive-Electrical-Impulse-Noise-

https://kitz.co.uk/adsl/rein.htm

[Dr. Sivana]

Your links are all to the UK and one in Canada. I guess my searches are U.S. centric!