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Singapore's IMDA published the revised Technical Specification for Short-Range Devices (IMDA TS SRD Issue 1 Revision 3) on 1 September 2023.
Please refer to the new standard: Annex: IMDATSSRD.pdf
The main change is the addition and approval of WiFi 6E under this new standard.
The permitted frequency is:
5.945 - 6.425 GHz
Indoor: less than 250 mW (e.i.r.p.)
Outdoor: less than 25 mW (e.i.r.p.)
Dealers and equipment suppliers may now register short-range devices such as WiFi 6E that comply with TS SRD.
Other frequencies have also been added to the standard.