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•the MPOE (Also known as the NID)
•the wall jack where the cable from the modem plugs in
•and at the end of the cable that plugs into the modem
These readings should be consistent throughout the process and insures that the best possible DSL sync signal is delivered to the modem, and eliminates bad wiring as a culprit.
At the MPOE he should hold the sync for at least three minutes, looking to see if his alarm light (dropped sync) comes on.