Is there any device you can put on a phone line to continuously or periodically draw a sealing current?
It looks like this requirement is new in either G.992.3 or G.992.2. Here is *probably* G.992.1/DMT which seems to lack that req: https://www.itu.int/rec/dologin_pub.asp?lang=e&id=T-REC-G.992.1-199907-I!!PDF-E&type=items …
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But the modem supports later standards too so I would guess its electrical behavior always matches them. Maybe well over 20mA (e.g. dial tone) is needed to clean oxidation.
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Bell equipment here in Canada uses the tii Network SCT-A, and it's used inside of Bell equipment. I don't think you as an individual can buy it, they probably only sell to telcos who routinely setup dry loops. It draws only 32mA and not continuously. Is it just snake oil?
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Not clear to me, but my guess would be that it's not snake oil. Non-continuous likely cleans better due to momentary high-current at switching.
End of conversation
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