While the power and GPIO connector provides a ground on pin 1, the housing of the Ericsson Cradlepoint R980 ruggedized 5G router also includes an external ground connector, the use of which is recommended but not required.
When installing the Ericsson Cradlepoint R980 ruggedized 5G router it is generally recommended that you connect the router's external ground connector to a suitable earth ground or the vehicle chassis, according to your specific installation environment. Follow all local requirements for ground wire specifications (not included).