Patent ID: 8280247

Claim:
An arrangement for supervising and/or controlling the bit rate of data pulses that are transmitted from a transmitter ( 16 ) to at least one optical conduction path ( 22 ), which transmitter ( 16 ) has an input side ( 18 ) which receives electrical pulses from an electric connection ( 14 ) and an output side ( 20 ) from which light pulses are transmitted to said optical conduction path ( 22 ) in response to the received electrical pulses, which arrangement comprises a supervising unit ( 24 ) with at least one input ( 26 ) which is suited to be connected to said electric connection ( 14 ), characterised in that the supervising unit ( 24 ) is arranged to estimate or determine the bit rate of the pulses that are received at said input ( 26 ) of the supervising unit ( 24 ) and in that the arrangement is arranged to carry out at least one measure which depends on a comparison between the estimated or determined bit rate and at least one predetermined value of the bit rate, wherein the arrangement is arranged such that said measure means that either the transmission of light pulses on said optical conduction path ( 22 ) is stopped or that an annotation is done in a memory ( 36 ), wherein the supervising unit ( 24 ) is arranged to estimate or determine the bit rate of the pulses that are received at said input ( 26 ) of the supervising unit ( 24 ) by determining the frequency of the number of transitions in the data flow.