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An adapter for connecting an RJ-45 port and an RJ-11 port consists of at least an RJ-45 port and at least an RJ-11 port. The RJ-45 port is for connecting an RJ-45 device which uses an RJ-45 connector while the RJ-11 port is for connecting an RJ-11 device which uses an RJ-11 connector, and the RJ-45 port can be electrically coupled with the RJ-11 port.