This chapter describes the Electrical Layer specifications for a Router Assembly that supportsthe Gen 2 and Gen 3 modes ofoperation.All Router Assembliesshall support Gen 2 speed(10Gbpsper Lane).A Router Assembly that ispart of a USB4™hub shallsupport Gen 3 speed (20Gbps per Lane). ARouter Assemblythat ispart of a USB4 host or USB4 devicemay optionally support Gen 3 speed (20Gbpsper Lane).