If you have a home alarm system, do not put your alarm box in series with your incoming ADSL line!

Home security systems with dial-out alert capability are often installed IN-LINE.. in other words, your telco line comes in, goes into your alarm box, comes out and continues to your junction box. The alarm system, whether active, standby or unpowered, is not providing you with a clean connection.

Although you can get DSL Sync with this method, the Alarm system can attenuate (reduce) some of the high frequencies required for high speed, leaving you with poor performance or worse. Isolate your alarm system behind microfilters, or on the voice circuit behind a splitter, as you would any other phone in your house.

A SWBell user (David Taylor) passed us these two diagrams.
Original setup, Modified setup, that solved his persistent speed problems.

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by mballard