page_title: TNC connector
section_title: Reverse-polarity TNC
hierarchical_section_title: TNC connector / Variations / Reverse-polarity TNC
caption_attribution_description: English: Left, an RP-TNC connector from a 2.4GHz antenna. Right, a standard TNC connector on a UHF antenna. Both antennas are from Telex wireless communications equipment.
context_page_description: The TNC connector is a threaded version of the BNC connector.
context_section_description: Reverse-polarity TNC (RP-TNC, sometimes RTNC) is a variation of the TNC specification which reverses the polarity of the interface. This is usually achieved by incorporating the female contacts normally found in jacks into the plug, and the male contacts normally found in plugs into the jack.
  Because they were not readily available, RP-TNC connectors have been widely used by Wi-Fi equipment manufacturers to comply with specific local regulations, such as those from the FCC, which are designed to prevent consumers from connecting antennas which exhibit gain and therefore breach compliance.  The FCC considered that the RP-TNC was acceptable in preventing consumers changing the antenna; but by 2000 it regarded them as readily available, though delaying its ruling indefinitely.  As of 2013, leading manufacturers are still using RP-TNC connectors on their Wi-Fi equipment.
caption: Left, a female RP-TNC connector from a 2.4GHz antenna. Right, a standard male TNC connector on a UHF antenna.
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