Issue link: https://te.mouser.com/i/1472768
6 AEROSPACE / WHITE PAPER CONNECTING THE FUTURE OF FLIGHT Accordingly, the aircraft is smaller, and the amount of wiring in a UAM airframe is significantly less than for civilian aircraft. Nevertheless, depending on the eVTOL design, electrical and electronic components contribute from 27% to 68% of non-passenger, non- structural system weight. The ability to shave weight is critical in UAM aircraft design. As aircraft maximum takeoff mass (MTOM) increases, the required battery mass increases significantly. The relationships between weight and other design variables have a cascading effect: Increasing eVTOL mass increases disk loading on rotors, which increases the power needed to maintain rotor speed, which increases battery size. Implementing two-wire SPE for electronics connectivity reduces weight by a small fraction of total eVTOL mass. Nevertheless, that reduction can significantly contribute to overall power-to-weight effectiveness due to the positive cascading effects of losing several pounds of useless weight. TE TECHNOLOGIES FOR SINGLE PAIR ETHERNET Mini-ETH As a CSS member of the SAE Industry Tech- nologies Consortia, TE developed a family of 100BASE-T1 products that meet ARINC 854 specifications. The Mini-ETH interconnection system from TE is an end-to-end, point-to- point, ARINC 854-compliant SPE solution that helps deliver significant SWaP and performance advantages for UAM aircraft. The same TE expertise that developed MATEnet automotive interconnects—and a host of ARINC compliant interconnects for aircraft—is embodied in Mini- ETH technology. The result is a two-wire SPE platform to enhance bandwidth and data rates while enabling UAM aircraft to fly smarter and lighter. Bandwidth and Data Rates The bandwidth and data rate obtainable with a Mini-ETH solution are well suited to non-flight-critical UAM connectivity. Complying with ARINC 854 adoption of 100BASE-T1 speci- fications, the Mini-ETH interconnection system is qualified for 200 MHz and 100 Mbps operation at 15 m (49 ft) link lengths. Current Mini-ETH interconnects are described under ARINC 854 specifications for the Cabin Equipment Network Bus. Compatible connec- tors and cables are described under ARINC 800 Part Two and Part Three specifications, respec- tively. Cabling Compared to 4-wire quadraxial cable commonly used for 100 Mbs Ethernet or octal cable with eight 24 AWG wire used in common Category 5e and 6a cable, two-wire Mini-ETH cable pro- vides up to 62 percent weight savings (Figure 3 on page 7). The smaller dimensions of Mini- ETH cables with 26 AWG wire help improve space utilization. For example, switching from a quadraxial cable with four 24 AWG wires to a Mini-ETH cable with two 26 AWG wires shrinks cable diameter by approximately 15 percent. Mini-ETH cable's jacket construction is based on TE's long experience with its Raychem preci- sion-extruded, high-temperature foamed dielec- trics. Jacket materials are low smoke, meet the flammability requirements of Federal Aviation Regulations (FAR) Part 25, and the toxicity re- quirements imposed by major aircraft manufacturers.