Tony Harminc <TONY@mcgill1.bitnet> (04/30/91)
I forwarded the discussion on the $5 zener diode devices to a friend who does not read this list. His comments follow: Greetings: Tony you may want to repost this. The device with the zeners does not have DOC (Canadian) approval because it does NOT meet Canadian standards and cannot be approved here. It does meet the more lax US standards, although even that is open to some interpretation. It is a series device and does require approval according to tariffs. It works on most lines but does not work under all circumstances (not due to stray RF but the characteristics of the line and various qualities of telephone connected). If you're interested I'll write a longer epistle on these devices. I have designed one and have gotten it approved in both Canada and the US. Regards, Howard If anyone is interested enough I can post Howard's further comments. He is quite familiar with the standards approval process in both countries. Tony Harminc