ITU-T G.9991

{{Short description|ITU-T standard for indoor line-of-sight optical networking}}

ITU-T G.9991 (provisionally known as G.vlc) is a standard developed by ITU-T for indoor line-of-sight optical networking.{{Cite web |last=Hollister |first=Sean |date=2023-07-15 |title=Infrared may no longer be a punchline, as IEEE approves 9.6Gbps wireless light |url=https://www.theverge.com/23795599/li-fi-wi-fi-802-11-bb-internet-of-light |access-date=2023-07-17 |website=The Verge |language=en-US}}{{Cite web |last=Eggmayr |first=Bernadette |date=2020-01-01 |title=ITU-T G.9991 (aka G.VLC) Activities in 2020 |url=https://www.eliot-h2020.eu/itu-t-g-9991-aka-g-vlc-activities-in-2020/ |access-date=2023-07-17 |website=ELIoT |language=en-GB}}

G.9991 was approved in March 2019.{{Cite web |title=ITU-T Recommendation database |url=https://www.itu.int/itu-t/recommendations/rec.aspx?rec=13781 |access-date=2023-07-17 |website=ITU |language=en}} It is used by Signify (formerly Philips Lighting) as the basis for their optical communication products.{{Cite web |date=2020-09-04 |title=Why Signify builds 'LiFi' products to ITU standards |url=https://www.itu.int/hub/2020/09/why-signify-builds-lifi-products-to-itu-standards/ |access-date=2023-07-17 |website=ITU Hub |language=en-US}}