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ZyXel C1000Z upgrade to Technicolor C2000T speed issues

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Hi, I have 20Mbps service on CL. ZyXel C1000Z would report 20Mbps down, 0.7 up. Worked okay for quite a while, but WiFi seemed to degrade over the years. I thought maybe the unit was dying, so bough a Technicolor C2000T off EBay - looked like it was brand new. After doing a factory reset and configuring the C2000T, web interface would report 7Mbps down, 0.7 up for DSL1, also "estimated loop length" is 9072 ft. The C1000Z would always report 20Mbps down, 0.7 up, "estimated loop length" 1900 ft. I'm wondering if the C2000T low pass filter for DSL1 is causing a problem (I have read that there is a low pass filter, but I thought that might only be for the POTS connection and should not affect the DSL speed). Does anyone have ideas regarding this issue? Is it possible that the DSL1 low pass filter is causing the longer estimated loop length, and thus causing the slower download speed? The Ebay seller has already said he'd take a return. I'm just not sure if I should try another one (in case I just got a bad one), or if I should try a C2100T (which I understand does not have a low pass filter or POTS connection). I have a VOIP phone with FlowRoute, but don't need the VOIP/POTS connections on the modem/router since I have an ObiHai ATA adapter that works fine connected to the router. Thanks for any help/suggestions.

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