47 CFR § 27.1501 - Definitions.
---
identifier: "/us/cfr/t47/s27.1501"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "47 CFR § 27.1501 - Definitions."
title_number: 47
title_name: "Telecommunication"
section_number: "27.1501"
section_name: "Definitions."
chapter_name: "FEDERAL COMMUNICATIONS COMMISSION"
subchapter_number: "B"
subchapter_name: "COMMON CARRIER SERVICES"
part_number: "27"
part_name: "MISCELLANEOUS WIRELESS COMMUNICATIONS SERVICES"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "47 U.S.C. 154, 301, 302a, 303, 307, 309, 332, 336, 337, 1403, 1404, 1451, and 1452, unless otherwise noted."
regulatory_source: "62 FR 9658, Mar. 3, 1997, unless otherwise noted."
cfr_part: "27"
---
# 27.1501 Definitions.
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.