“What makes a fax line a fax line? I need to connect my H@P officejet J4680 all-in-one to my spectrum modem fifty feet away. The phone line doesn't work for my fax machine.”
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You need an RJ11 (M) type connector for the HP. I just spent 2 hours chatting with HP for the same issue with mine and a regular phone cord will not work. The M is for multi-line. Best Buy does not seem to include that information in any of it specs on the phone cords. Hope this helps. You probably need HP part number 8121-0811. You need to get it from another reseller, HP doesn't have the part for sale.
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