The first thing we tried was hooking the Westell directly into the line at the outside box. That connection had good sync readings. But plugging directly into the line upstairs did not. At that point I went around trying different telephone jacks and it turns out the upstairs jack (which is a pair of jacks) is somehow wired to the kitchen jack but I'm not sure how. The kitchen jack has a huge mess of wires behind it, none of which is clearly connecting to the upstairs jacks. The left-hand jack in the new extension of the house is on a different pair and had really good sync.

But since the downstairs jack would be inconvenient, being no where near our computers, on Mike's advice I disconnected the wire between the two jacks upstairs. So now that pair runs through the kitchen to one jack upstairs, instead of two jacks upstairs. This change made the signal good, and when I attached a 3-way adapter with a pair of filters for the computer modem and telephone, the signal got even better (for some strange reason). So that's the configuration we are using now.

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