The advent of Gbit/s transfer rates in space flight has been trialled for several years. Whereas ESA and NASA use laser-based technologies for radio communication between earth and space, component suppliers have also been trying new avenues with corded components. In that sense, it was a small trial with big bandwidth in the test environment on the ground. On one side, Leoni fitted a star-quad data cable to link the test equipment and onboard data network (ODN) with a Quadrax connector approved for use in space and, for the first time, assembled this with its own SFP+ connector on the other side. SFP+ stands for small form-factor pluggable and is a standardised interface system for network connections. Like all direct attach copper (DAC) cables by Leoni, SFP+ cables are normally deployed as connecting cables in computer centres for broadband data transfer up to 400 Gbit/s. The transfer rate specified for SFP+ is 10 Gbit/s.
On the ground harness for space flight, both the cable with a wire gauge of AWG 24 and the assembly are provided by Leoni. As an ESCC-approved manufacturer, the cables specialist makes flight and ground harnesses for space travel and, thanks to its vertical integration in the production of cables and systems, controls the whole transmission channel. With this market access and its know-how involving DAC cables, Leoni was able to contribute a suitable 10 Gbit/s solution to the ESM’s development phase and provides the matching SFP+ ground harness also for use in the vacuum chamber. This variant not only transfers 10 Gbit/s, but also effortlessly withstands temperature fluctuation from -180°C to +120°C.