Patent ID: 6181709
Filing Date: 2001-01-30
Classification: G07C,H04Q

Abstract:
A method for the enlargement of the range of the transmission channel between functional groups of the ISDN-user interface with a minimized bandwidth wherein:a) the data transmission is carried out on the network side such that the ISDN-specific coded data incoming at an ISDN interface are converted into binary-coded data by means of a code converter, separatedly for B- and D-channel information,b) the incoming data of the B-channels are separated for B1- and B2-channel data, sections of equal lengths for B1- and B2-channel data are prepared in a buffer device and subsequently fed to a transmission means in a step timing derived from the ISDN network timing alternating between B1- and B2-channel data and transmitted through this transmission means to a receiver side whereby the data arriving from the buffer device are checked for data equality and compressed,c) from the data of the D-channel, blocks are formed and, being preferred to B-channel data, are fed to the transmission means for the transmission to the receiver side in a step timing derived from the ISDN network timing,d) on a terminal side, by means of a timing regaining device, the ISDN-specific timing signals, which are necessary for the transmitter and receiver to communicate, are regained from the time sequence of the data bits transmitted, ande) the received data are analysed, identified D-channel blocks are resolved and directly fed to a code converter, and identified B-channel data are decompressed and, separatedly for B1- and B2-channel data, are buffered in a buffer device, and are fed to the code converter according to the regained timing, and the binary-coded data are line code converted into ISDN-specific data,f) on the terminal side, the transmission of the data is executed similar to the process steps a) to c) whereby the timing mentioned in the process steps b) and c) is that timing that is regained in step d), andg) on the network side, the received data are analysed, identified D-channel blocks are resolved and directly fed to the code converter, and identified B-channel data are decompressed and, separatedly for B1- and B2-channel data, are buffered in a buffer device and are fed with the ISDN network timing to the code converter, and the binary-coded data are line code converted into ISDN-specific data.