Technical guide to CAN gateway design, CAN FD routing, UDS diagnostics, domain isolation and automotive Ethernet integration.
A vehicle gateway is responsible for more than forwarding frames. It defines which domain can talk to another domain, which diagnostic services are allowed, how messages are transformed and how network faults are contained. In centralized and zonal architectures, the gateway becomes the boundary between legacy CAN networks and Ethernet-oriented compute.
CAN FD increases payload size and data phase speed, but it does not remove the need for deterministic scheduling and careful bus loading. Gateways help normalize legacy CAN signals into service-oriented data streams that can be consumed by middleware, telematics, OTA agents and cloud analytics.