scope:

This European Telecommunication Standard (ETS) deals with the procedures allowing the technical realization of packet mode data with the Terrestrial Flight Telecommunications System (TFTS) environment using transparent network support according to the teleservice definitions contained in ETS 300 326-1 [1].

The TFTS packet data transmission services build on the existing architecture defined in ETS 300 326 [1], [2] and [3] introducing a new network function termed the Centralised Interworking Function (CIF). The selection of a networking protocol, and its definition is outside the scope of this ETS. The use of a particular protocol does not constrain the actual implementation of CIF functionality.

Transport layer aspects

In order to ensure the resolution of lost or duplicated packets arising from handover, it is assumed that the higher layers implement an end to end acknowledgement function.