47 C.F.R. § 90.537 Trunking requirement.
Title 47 - Telecommunication
(a) General use channels. All systems using six or more narrowband channels in the 764–776 MHz and 794–806 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]
Title 47: Telecommunication
PART 90—PRIVATE LAND MOBILE RADIO SERVICES
Subpart R—Regulations Governing the Licensing and Use of Frequencies in the 764–776 and 794–806 MHz Bands
§ 90.537 Trunking requirement.
