A radio equipment controller, REC, comprising: a first determining unit, configured to determine that a main line used by the REC to communicate with a first radio equipment, RE, is faulty; a second determining unit, configured to determine a standby line used by the REC to communicate with the first RE; and a communications unit, configured to communicate with the first RE by using the standby line; wherein the main line is a common public radio interface, CPRI, communications line; and the standby line is a power cable line, or is a power cable plus CPRI communications line; characterized in that: the first determining unit comprises a first sending subunit, a first receiving subunit, and a first determining subunit, wherein the first sending subunit is configured to send an addressing request message specific to all controlled REs through a CPRI port or through a power cable port and a CPRI port; the first receiving subunit is configured to receive an addressing response message from at least one RE, wherein the at least one RE comprises the first RE; and the first determining subunit is configured to: when it is determined that a path of at least one addressing response message received by the first receiving subunit from the first RE does not comprise the main line, determine that the main line used for communication with the first RE is faulty; and the second determining unit is specifically configured to: when the path of the at least one addressing response message received by the first receiving subunit from the first RE does not comprise the main line, determine, according to the path of the at least one addressing response message, the standby line used for communication with the first RE. a first determining unit, configured to determine that a main line used by the REC to communicate with a first radio equipment, RE, is faulty; a second determining unit, configured to determine a standby line used by the REC to communicate with the first RE; and a communications unit, configured to communicate with the first RE by using the standby line; wherein the main line is a common public radio interface, CPRI, communications line; and the standby line is a power cable line, or is a power cable plus CPRI communications line; characterized in that: the first determining unit comprises a first sending subunit, a first receiving subunit, and a first determining subunit, wherein the first sending subunit is configured to send an addressing request message specific to all controlled REs through a CPRI port or through a power cable port and a CPRI port; the first receiving subunit is configured to receive an addressing response message from at least one RE, wherein the at least one RE comprises the first RE; and the first determining subunit is configured to: when it is determined that a path of at least one addressing response message received by the first receiving subunit from the first RE does not comprise the main line, determine that the main line used for communication with the first RE is faulty; and the second determining unit is specifically configured to: when the path of the at least one addressing response message received by the first receiving subunit from the first RE does not comprise the main line, determine, according to the path of the at least one addressing response message, the standby line used for communication with the first RE. the first determining unit comprises a first sending subunit, a first receiving subunit, and a first determining subunit, wherein the first sending subunit is configured to send an addressing request message specific to all controlled REs through a CPRI port or through a power cable port and a CPRI port; the first receiving subunit is configured to receive an addressing response message from at least one RE, wherein the at least one RE comprises the first RE; and the first determining subunit is configured to: when it is determined that a path of at least one addressing response message received by the first receiving subunit from the first RE does not comprise the main line, determine that the main line used for communication with the first RE is faulty; and the second determining unit is specifically configured to: when the path of the at least one addressing response message received by the first receiving subunit from the first RE does not comprise the main line, determine, according to the path of the at least one addressing response message, the standby line used for communication with the first RE.