Question about 2wire HomePortal 1000HW DSL Modem and Network Router -1000-400210-000_LN_R (1000400210000LNR)

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Polarity of AC Adaptor

Dear Sir:

Some AC Adaptor with inside + pole. other with inside pole Negative.

Please advise me how to determine the polarity of the inside pole.

Thank you very much.

Richard

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