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DSL can be affected by bridged tap. It depends on where the bridged tap is located ... the farther away from the customer's location, the better.
DSL signal reflects back through the cable pair from the end of a bridged tap, much like a tennis ball against a brick wall. The deflected signal is now out of phase and mixed with the original. The modem receives both signals and gets confused. This is when you "take errors" or cannot sync. If the bridged tap is long, by the time the signal bounces back, the original signal is far ahead and more powerful. Therefore, the modem will ignore the weaker signal and shows no problems.
Almost every cable pair in the world has bridged tap on it, so it definitely isn't always a DSL killer.
This FAQ entry updated by nunya01
Also read About DSL for lots more information