Ascom Tech Ag

David John Tonks

A signal used in the transmission of data in a communication system (for example in an ATM network), comprised of immediately successive cells. For the purpose of cell synchronization, filler cells (I) containing a predefined bit pattern are provided. This pattern is provided with an error protection code that differs from the error protection code used for the user data. Even if the user data should coincidentally contain the predefined bit pattern, the synchronization circuit will not be able to be simulated, since this false bit pattern is provided with a different error protection code. In order to test and ensure the synchronization state, a BIP value at the end of the cell is checked at the receiver end.

Signal used in the transmission of data in a communication system

A signal used in the transmission of data in a communication system including immediately successive cells for the purpose of cell synchronization, includes filler cells containing a predefined bit pattern. This pattern is provided with an error protection code that differs from an error protection code used for user data. Even if the user data should coincidentally contain the predefined bit pattern, the synchronization circuit will not be able to be simulated, since this false bit pattern is provided with a different error protection code. In order to test and ensure the synchronization state, a BIP (bit interleaved parity) value at the end of the cell is checked at the receiver end.

Signal transmitter used in the transmission of data in a communication system

Four parallel lines are provided for the guided transmission of a data flow with a high rate (sub-GHz range). Two data bits per transmission clock are transmitted via these lines. The other two remaining lines are used for signaling certain changes in both data bits. Data transmission and signaling are accomplished on the basis of the Grey code. In other words, only one of the four lines changes state per clock. The interface according to the invention has reduced sensitivity to signal skew and permits simple clock recovery in terms of circuit engineering.

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Sigriswil, Switzerland

David John Tonks