Terms used in this subpart shall have the following meanings:

900 MHz broadband. The 900 MHz broadband systems in the 897.5-900.5/936.5-939.5 MHz band licensed by the Commission pursuant to the provisions of this subpart.

900 MHz broadband licensee. An entity that holds a 900 MHz broadband license issued pursuant to this subpart.

900 MHz broadband segment. The segment of realigned 900 MHz spectrum (i.e., the 897.5-900.5/936.5-939.5 MHz band) licensed by the Commission pursuant to the provisions of this subpart.

900 MHz narrowband segment. The segments of realigned 900 MHz spectrum (i.e., the 896-897.5/935-936.5 MHz and 900.5-901/939.5-940 MHz bands (Paired channels 1-119 and 361-399)) designated for narrowband operations and licensed pursuant to 47 CFR part 90, subpart S.

Complex system. A covered incumbent's system that consists of 45 or more functionally integrated sites.

County. For purposes of this part, counties shall be defined using the United States Census Bureau's data reflecting county legal boundaries and names valid through January 1, 2017.

Covered incumbent. Any 900 MHz site-based licensee in the broadband segment that is required under §90.621(b) to be protected by a broadband licensee with a base station at any location within the county, or any 900 MHz geographic-based SMR licensee in the broadband segment whose license area completely or partially overlaps the county.

Eligibility Certification. A filing made to the Commission as part of the prospective broadband licensee's application for a 900 MHz broadband license that demonstrates satisfaction of the eligibility restrictions.

License area. The geographic component of a 900 MHz broadband license. A license area consists of one county.

Power spectral density (PSD). The power of an emission in the frequency domain, such as in terms of ERP or EIRP, stated per unit bandwidth, e.g., watts/MHz.

Site-channel. A channel licensed at a particular location.

Transition plan. A filing made to the Commission as part of the prospective broadband licensee's application for a 900 MHz broadband license that includes a plan for transitioning the band in the particular county.

Transitioned market. See section 90.7 of part 90 of this chapter.