PAM4 encoding features lower modulation bandwidth for sub-1 GHz operation, allowing manufacturers to more easily migrate to A-PHY while using either legacy cables on current platforms or lower-cost cables on new platforms. If you have multiple devices for which you want to send a downlink message, you can use a multicast group. You can schedule and send downlink messages for each device that youve onboarded to AWS IoT Core for LoRaWAN. This enables two A-PHY ports over a single cable, saving cost, weight and complexity compared with using two separate coaxial or shielded twisted pair cables.Ī-PHY v1.1 also adds optional PAM4 encoding for downlink gears G1 and G2, with data rates of 2 Gbps and 4 Gbps, respectively. Downlink messages are messages that are sent from AWS IoT Core for LoRaWAN to your wireless device. MIPI A-PHY v1.1, adopted in 2021, introduces several enhancements and is fully backward compatible with v1.0, allowing devices using both releases to coexist on the same network.Ī-PHY v1.1 doubles the total downlink data rate supported by A-PHY from 16 to 32 Gbps by adding support for Star Quad (STQ) shielded dual differential pair cables that provide dual differential pairs of conductors within a single shielded jacket. A-PHY v1.1 will also be submitted for adoption as an IEEE standard.įor information about becoming a member, see Join MIPI. A-PHY v1.0 was also adopted as an IEEE standard in June 2021 and is available as IEEE 2977-2021. MIPI A-PHY was developed by the MIPI A-PHY Working Group and is available to MIPI Alliance members. In addition to automotive uses, the specification will be well-suited for applications such as IoT and industrial. It is anticipated that the first vehicles using A-PHY components will be in production in 2024. For integration with existing network backbones, A-PHY complements Ethernet, CAN, FlexRay and other interfaces. This reduces wiring, cost and weight, and allows designers to optimize systems for the performance, cost and complexity required by their use cases, providing scalability and flexibility to meet a broad range of speed and design needs. The specification provides an asymmetric data link in a point-to-point or daisy-chain topology, with high-speed unidirectional data, embedded bidirectional control data and optional power delivery, all over a single cable. They have also announced plans for the ViaSat-2 satellite, to be launched in mid-2016, which will have 2.5 times the capacity of ViaSat-1, and will have a single beam that covers the continental U.S., Mexico, most of Canada, portions of Central America and the Caribbean, and the North Atlantic over to the western edge of Europe.MIPI A-PHY ® is a long-reach serializer-deserializer (SerDes) physical layer interface for automotive applications, including ADAS, ADS and other surround-sensor applications, including cameras and in-vehicle infotainment (IVI) displays. The satellite downlink bandwidth is between 52-416 MHz.Īs of March 2013, ViaSat claimed 512,000 customers. ViaSat is authorized for up to 250,000 such terminals in the continental U.S., operating under the callsign E120026. The antennas have transmit gain of about 44 dBi, and receive gain of about 40 dBi. User terminals utilize a dish of 0.695 m (about 27") maximum diameter, and will uplink using carriers between 625 kHz and 10 MHz wide using max EIRP between 47.2-50.3 dBW.
ViaSat-1 has 72 user beams, of which 63 serve the U.S. The satellite downlinks and uplinks use both right- and left-hand circular polarizations from a geostationary orbit at 115.1 deg west longitude. ViaSat uses this spectrum for its Ka-band direct-to-consumer broadband Internet service, under the trade name "exede." The ViaSat-1 satellite was launched from Baikonur on October 19th, 2011, and entered commercial service on January 16th, 2012.
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