2018, SES broadcast an 8K television signal via its satellite system for the first time, as part of its Industry Days conference at the Luxembourg HQ. The 8K demonstration content, with a resolution of 7680 x 4320 pixels, a frame rate of 60 frames per second and 10-bit colour depth, was encoded in HEVC and transmitted at a rate of 80 Mbit/s via the Astra 3B satellite. In September 2018, in response to a Notice of Proposed Rulemaking of July 2018 from the United States Federal Communications Commission (FCC) to make the 3.7 to 4.2 GHz spectrum available for next-generation terrestrial fixed and mobile broadband services, SES, along with Intelsat, Eutelsat and Telesat - together providing the majority of C-band satellite services in the United States, including media distribution reaching 100 million United States households - established the C-Band Alliance (CBA). The consortium's proposal to the FCC is to act as a facilitator for the clearing and repurposing of a 200 MHz portion of C-band spectrum to accelerate the deployment of next generation 5G services while protecting incumbent users and their content distribution and data networks in the US from potential interference. In April 2019, four O3b medium Earth orbit (MEO) satellites were launched by Arianespace at the Centre Spatial Guyanais in Kourou, French Guiana to complete the constellation of 20 first generation satellites for the SES-owned network communications service provider. In May 2019, for the first time in Europe, 8K demonstration content was received via satellite without the need for a separate external receiver or decoder. At the 2019, SES Industry Days conference at Betzdorf, Luxembourg broadcast quality 8K content (with a resolution of 7680 x 4320 pixels at 50 frames/s) was encoded using a Spin Digital HEVC encoder (at a bit rate of 70 Mbit/s), uplinked to a single 33 MHz transponder on SES' Astra 28.2°E satellites and the downlink received and displayed on a Samsung 82in Q950RB production model TV. In September 2019, SES announced it had partnered with satellite payload and network management systems developer, Kythera Space Solutions to develop the ARC (Adaptive Resource Control) software to enable the dynamic control and optimisation of power, throughput, beams and frequency allocation on O3b mPOWER, SES-17 and other future high-throughput satellites and their networks, autonomously optimizing space and ground resources, on-the-fly, in accordance with customers' changing needs. In September 2019, SES became a Microsoft Azure ExpressRoute services partner