I'm thinking a DSL filter plus an appropriate resistor across the "phone" side might do it, but is there a better approach?
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Replying to @RichFelker
Yes. Go buy an active sealing current terminator.
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Replying to @CarlosODonell
Thanks. Any pointers for where? Google isn't being very helpful.
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Replying to @RichFelker @CarlosODonell
The ones I see look like they're for dry lines with no voice (& thus no current source at other end).
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Replying to @RichFelker
They are indeed for dry lines. Why would you need sealing current if you have a wet line? Your phone should be drawing enough current to prevent contact oxidation?
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Replying to @CarlosODonell @RichFelker
... or to put it another way: Plug a cheap phone into your jack. That should be enough?
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Replying to @CarlosODonell @RichFelker
I just pulled up G.992.3 and there is a sealing current requirement in the standard for modems meeting the spec. However, the operator is given the option to disable wetting currents. Have you done a line test for this? Can you draw 20mA from the ATU-C?
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Replying to @CarlosODonell
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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Replying to @RichFelker @CarlosODonell
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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Replying to @RichFelker
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.
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