Canada’s ISED releases RSS-247 3rd Edition

In August 2023, ISED (Innovation, Science, and Economic Development Canada) released on its official website the Radio Standards Specification RSS-247, 3rd Edition, for Digital Transmission Systems (DTS), Frequency Hopping Systems (FHSS), and Licence-Exempt Local Area Network (LE-LAN) devices. This specification replaces RSS-247, 2nd Edition, from February 2017.

The old standard had a transition period of six months from the date of publication. During this transition period, certification applications for either RSS-247 2nd Edition or RSS-247 3rd Edition would be accepted. After this deadline, only certification applications for devices complying with RSS-247 3rd Edition would be accepted.

The main changes are as follows:

1. Section 2.1 has been added to include information about the upcoming effective date of the document. It introduces the official use date of the new standard and the transition period for the old standard.
2. Section 6.2 has been modified to clarify that different measurement methods can be adopted based on the device’s operating frequency range. The old standard did not have relevant descriptions.
3. Section 6.2.5 has been added to introduce channels spanning from 5850-5895 MHz, including those crossing 5850 MHz. The new standard adds this range, which the old standard does not support.
4. Section 6.2.5.1 has been added to provide general information and definitions regarding outdoor and indoor devices in the 5850-5895 MHz frequency range. The old standard does not support this frequency range.
5. Section 6.2.5.2 has been added to determine power limits for devices operating in the 5850-5895 MHz frequency range. Frequency stability should be sufficient to ensure that, during testing under temperature and power supply voltage variations specified in RSS-Gen, the occupied bandwidth remains within each sub-band. The old standard does not support the 5850-5895 MHz frequency range.
6. Section 6.2.5.3 has been added to determine unnecessary emission limits for devices operating in the 5850-5895 MHz frequency range. The old standard does not support this frequency range.