A method for the transmission of line-oriented data sets. This method employs two data set structures which keep the images of the data sets at different time stages and which are filled alternatingly with the data sets. The method allows to determine updates of the data sets and avoids re-transmission...http://www.google.com/patents/US5689639?utm_source=gb-gplus-sharePatent US5689639 - Method and apparatus for updating and transmitting line-oriented data sets 
