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FCC Part 68
The Federal Communication Commission's standard for the connection of terminal equipment to the public telephone network. In order to prevent voltage damage to the phone network, FCC Part 68 requires that any cables used in new installations - or modifications to existing systems - must be made of minimum 24-gauge solid copper conductors, in a twisted-pair format that complies with standards for Cat3 or higher, as defined by ANSI/TIA/EIA building wiring standards