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 SPA-300 FXO Polarity and Does it Matter? Technical support, how-to guides, troubleshooting, and general assistance for Linksys hardware. |
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May 2nd, 2005, 11:40 AM
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 SPA-300 FXO Polarity and Does it Matter? My SPA-300 (on-hook) Line Voltage reading is 42 (V). Does it matter whether it is plus or minus? If so, for what SPA-300 functions does it matter? (No PABX involved.) Thanks, Rob     |
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May 5th, 2005, 03:56 PM
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| RE: SPA-300 FXO Polarity and Does it Matter? RobT, Some devices are polarity conscious, but the SPA3K does not appear to be so. I have tried mine with line both ways, and still works. Mark |
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May 6th, 2005, 03:01 AM
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| RE: SPA-300 FXO Polarity and Does it Matter? Polarity matters most when using a polarity conscious telephone (like the earliest ones) or when physically mixing lines. The voltage should be -48vDC. You should probably reverse the wires to make this so. That will ensure that you do not suffer voice degradation when setting up a three-way call involving your PSTN Line. Even though you do not mention it, the Line 1 side of the box should be wired out to your phones with the correct polarity, too. Many multiline Caller ID boxes and telephones will behave strangely if both/all of their input lines are not of the same polarity.
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