A vehicle communication system that includes a plurality of functional system modules (FSMs) and a master system module (MSM) coupled to the FSMs. The MSM includes a multi-core processing unit that includes multiple functioning core assemblies (FCAs) and a managing core assembly (MCA). Each FCA includes a substrate carrying a core CPU and an optical interface circuit carried by a first edge of the substrate. The MCA includes a substrate having a first and second major surfaces—the first major surface includes a plurality of rows of electrical connections, each of which are adapted to couple with one of the FCAs to enable communication between the core CPU (of MCA) and the core CPUs (of the FCAs). Each of the FCAs may have a second edge that abuts the first major surface at one of the plurality of rows of electrical connections.