14 CFR § 1215.102 - Definitions.

---
identifier: "/us/cfr/t14/s1215.102"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "14 CFR § 1215.102 - Definitions."
title_number: 14
title_name: "Aeronautics and Space"
section_number: "1215.102"
section_name: "Definitions."
chapter_name: "NATIONAL AERONAUTICS AND SPACE ADMINISTRATION"
part_number: "1215"
part_name: "TRACKING AND DATA RELAY SATELLITE SYSTEM (TDRSS)"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "Sec. 203, Pub. L. 85-568, 72 Stat. 429, as amended; 42 U.S.C. 2473."
regulatory_source: "48 FR 9845, Mar. 9, 1983, unless otherwise noted."
cfr_part: "1215"
---


# 1215.102 Definitions.

(a) *User.* Any non-U.S. Government representative or entity that enters into an agreement with NASA to use TDRSS services.

(b) *TDRSS.* TDRSS, including Tracking and Data Relay Satellites (TDRS), WSC, GRGT, and the necessary TDRSS operational areas, interface devices, and NASA communication circuits that unify the above into a functioning system. It specifically excludes the user ground system/TDRSS interface.

(c) *Bit stream.* The electronic signals acquired by TDRSS from the user craft or the user-generated input commands for transmission to the user craft.

(d) *Scheduling service period.* One scheduled contact utilizing a single TDRS, whereby the user, by requesting service, is allotted a block of time for operations between the user satellite and TDRSS.

[77 FR 6952, Feb. 10, 2012]