SysML blocks always include an ability to define internal connectors, regardless of whether this capability is needed for a particular block. Source OMG Systems Modeling Language (SysML) 1.6
The rest of the connectors linked to a port are external. Source OMG Systems Modeling Language (SysML) 1.6
Internal connectors to ports are the ones inside the ports owner (specifically, they are the ones that do not have a UML partwithPort on the connector end linked to the port, assuming NestedConnectorEnd is not applied to that end, or if NestedConnectorEnd Source OMG Systems Modeling Language (SysML) 1.6
Internal connectors to proxy ports can be typed by association blocks, including when the connector is binding. Association Source OMG Systems Modeling Language (SysML) 1.6
