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What is the jack marked as “ADSL Modem” for? Can I leave this jack open unconnected?

April 26, 2017Jack leave marked unconnected

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What is the jack marked as “ADSL Modem” for? Can I leave this jack open unconnected?

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If the filter/splitter is only used for telephone devices you can leave this “ADSL modem” jack open (unconnected). The “ADSL modem” port is provided for convenience of connecting ADSL modem/router without the need of getting a double adaptor, if the wall socket has been already occupied by a telephone with filter. You can move the modem and connected it to the “ADSL modem” port of any distributed filter in the house.