It carries the Code D keying — identified by a violet and claret housing — which mechanically prevents cross-mating with other Fakra color codes in the same harness bundle. The interface is 50 Ohm nominal, rated to 6 GHz, with a PTFE dielectric and gold-plated center contact for consistent signal integrity across the band.
The 6 GHz frequency ceiling covers most automotive and consumer wireless bands (LTE, Wi-Fi, 5G sub-6 GHz); above that, insertion loss rises and the SMB interface is not specified.
