In case your domain interfaces are realized in the technical infrastructure through different technical channels, protocols or interfaces, you should explicitely describe the mapping between those two areas.
A simple example of such a situation can be found in the diagram below. The relationships (mapping) can easily be described with a table:
|brake interrupt, driver override, rounds per-minute, throttle valve, positions
|Switches, keys, levers in cockpit
|Audio output, display in cockpit