RJ45 to RJ11 Adapter,Ethernet to Phone Line Adapter, Phone Line to Ethernet Adapter RJ45 8P8C Female to RJ11 6P4C Male Converter Adapter Cable - Walmart.com
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Cat6a Unshielded (UTP) RJ45 Male to Female Break-Away Adapter, 0.75ft (0.23m) - FS.com Singapore
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Amazon.com: [2-Pack] Phone Jack to Ethernet Adapter, Ethernet to Phone Line Adapter RJ45 Female to RJ11 Male Converter Adapter Cable for Landline Telephone Service : Electronics