---
kind: "section"
citation: "47 C.F.R. § 90.317"
title: "47"
number: "90.317"
heading: "Fixed ancillary signaling and data transmissions."
url: "https://uscodex.org/cfr/47/90.317"
---

# §90.317. Fixed ancillary signaling and data transmissions.

- (a) Licensees of systems that have exclusive-use status in their respective geographic areas may engage in fixed ancillary signaling and data transmissions, subject to the following requirements:
  - (1) All such ancillary operations must be on a secondary, non-interference basis to the primary mobile operation of any other licensee.
  - (2) The output power at the remote site shall not exceed 30 watts.
  - (3) Any fixed transmitters will not count toward meeting the mobile loading requirements nor be considered in whole or in part as a justification for authorizing additional frequencies in the licensee's mobile system.
  - (4) Automatic means must be provided to deactivate the remote transmitter in the event the carrier remains on for a period in excess of three minutes.
  - (5) Operational fixed stations authorized pursuant to the provisions of this paragraph are exempt from the requirements of §§ [90.425](/cfr/47/90.425.md) and [90.429](/cfr/47/90.429.md).
  - (6) If the system is licensed on 470-512 MHz conventional frequencies, and exclusivity has been achieved through the aggregate loading of more than a single co-channel licensee, then a licensee must obtain the concurrence of other co-channel licensees prior to commencing such ancillary operations.
- (b) Licensees of systems that do not have exclusive-use status in their respective geographic areas may conduct fixed ancillary signaling and data transmissions only in accordance with the provisions of [§ 90.235](/cfr/47/90.235.md) of this part.

## Notes

### Amendments

[57 FR 34693, Aug. 6, 1992]

### Authority

Authority: 47 U.S.C. 154(i), 161, 303(g), 303(r), 332(c)(7), 1401-1473

### Source

Source: 43 FR 54791, Nov. 22, 1978, unless otherwise noted.

### Amendments

[57 FR 34693, Aug. 6, 1992]