CFR > Title 47 - Telecommunication > CHAPTER I—FEDERAL COMMUNICATIONS COMMISSION > SUBCHAPTER D—SAFETY AND SPECIAL RADIO SERVICES (Parts 80–101) > PART 90—PRIVATE LAND MOBILE RADIO SERVICES > SUBPART R—Regulations Governing the Licensing and Use of Frequencies in the 763-775 and 793-805 MHz Bands (§90.521 to §90.555) > 90.537—Trunking requirement.

90.537—Trunking requirement.

(a) General use channels. All systems using six or more narrowband channels in the 769-775 MHz and 799-805 MHz frequency bands must be trunked systems, except for those described in paragraph (b) of this section.
(b) Interoperability channels. Trunking is permitted only on Interoperability channels specified in § 90.531(b)(1)(iii). Trunked use must be strictly on a secondary, non-interference basis to conventional operations. The licensee must monitor and immediately release these channels when they are needed for interoperability purposes.
[66 FR 10636, Feb. 16, 2001, as amended at 72 FR 48861, Aug. 24, 2007]