includes digital circuitry that is not used solely to enable the operation of the radio frequency circuitry used to provide carrier current operation also is subject to the requirements for unintentional radiators in subpart B. Section 15.607 Equipment Authorization of Access BPL equipment Access BPL equipment shall be subject to Certification as specified in Section 15.101 of this part. Section 15.609 Marketing of Access BPL equipment The marketing of Access BPL equipment must be directed solely to parties eligible to operate the equipment. Eligible parties consist of AC power line public utilities, Access BPL service providers and associates of Access BPL service providers. The responsible party, as defined in Section 2.909 of this chapter, is responsible for ensuring that the equipment