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RJ45 may refer to:

  • RJ45 (telecommunications), a connector standardized as the 8P8C modular connector (and the similar RJ45S with a keyed 8P2C)
  • RJ45 (computers), an unkeyed 8P8C modular connector used for Ethernet computer network cables (incorrectly referred to as RJ45)
  • RJ45 (telecommunications), a popular crimp-on connector often used for/with CAT5 and CAT6 cable ends