presumably the ring wire filter will filter in both directions, being a low pass filter. It only needs to pass the ring frequency, anything higher (including voice) can be blocked.

In a preliminary test one of these filtered ringwire faceplates appeared to reduce the impact of a wired extension (with ring wire) by some 75% in terms of downstream sync speed.

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As cahaddras says "It's a mix of both isn't it?

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Yes it is. The truth of the matter is that internal telephone wiring was never designed to carry RF signals. It really didn't matter too much when we had fixed-rate ADSL, but it's a completey different ball game with ADSL Max.

I had the same problem a while ago. see this post over on Routertech removing the bellwire made a major difference.

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In a preliminary test one of these filtered ringwire faceplates appeared to reduce the impact of a wired extension (with ring wire) by some 75% in terms of downstream sync speed.

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Thats good news.

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Thats good news.

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An even better test coming up today, runs at 256k downstream with 59 dB attenuation. Extension city, Arizona. I feel a blog entry coming on