ANSI C63.17-2006 pdf download American National Standard Methods of Measurement of the Electromagnetic and Operational Compatibility of Unlicensed Personal Communications Services (UPCS) Devices
1.3 Roadmap to the document
The tests for UPCS devices fall into two categories. The first category includes the traditional set of radio- frequency (RF) measurements of radiated power, emission mask, power spectral density (PSD), etc. These tests are given in Clause 6 of this standard. The second category includes tests for the channel monitoring and access requirements unique to UPCS devices. These requirements are sometimes collectively referred to as the spectrum etiquette. The associated tests are described in Clause 7 and Clause 8 of this standard, and relate to 47CFR15.323. Section 15.323 of Title 47 of the Code of Federal Regulations requires that a UPCS device (the EUT) monitor the received RF power level on the intended transmit channel 2 before transmitting, and it also provides criteria that the monitored power level must satisfy to allow the EUT to transmit on that channel. The tests in Clause 7 and Clause 8 are designed to verify compliance with these requirements. Annex A provides a table showing the sections in 47CFR15 that correspond to the tests in this document.
To test for compliance with the monitoring and access requirements, it is necessary to subject the EUT to deliberate interference with controlled spectral and temporal characteristics on a selected channel or channels, and observe the reaction of the EUT. To restrict operation of the EUT to the selected channel(s), interference or administrative commands are used to block the other channels.
Clause 6, Clause 7, and Clause 8 give the fundamental tests. Clause 4 discusses test methodology for both radiated and conducted RF emission, monitoring, and access tests. Radiated tests measure field strength to determine the effective isotropic radiated power (EIRP), power density, and out-of-band emissions (Clause 6). For the monitoring and access tests of Clause 7 and Clause 8, a calibrated field strength is applied to the EUT if radiated measurements are used. If all EUT antennas are detachable, the tests of Clause 6, Clause 7, and Clause 8 shall be done on a conducted basis; that is, RF connections can be made between the EUT, its companion device, and the RF measuring instrument and interference generators via shielded coaxial cable. There must be adequate shielding around the EUT (and possibly the companion device) to prevent unintended RF coupling.