Abstract: One embodiment relates to a method of transporting data packets between a plurality of transport units in a building. Transmit flows are created and associated with source-destination address pairs of new data streams received from outside a network of the transport units. A separate sequence space is provided for each transmit flow. The transmission of the data packets belonging to a same transmit flow is advantageously spread among multiple link-layer links. Other embodiments, aspects and features are also disclosed.