Abstract: Methods, system, nodes and computer program for transmission of a synchronous data stream having a bitrate, over an asynchronous packet data network between a transmitter node and a receiver node comprising: packaging, by the transmitter node, the synchronous data stream into data packets, transmitting, by the transmitter node, the data packets onto the asynchronous packet data network with a fixed packet rate defined by a first clock frequency which corresponds to the average distance in time between two consecutive data packets transmitted onto the asynchronous packet data network, which is independent of the bitrate of the synchronous data stream, receiving, by the receiver node, the data packets from the asynchronous packet data network detecting, by the receiver node, the fixed packet rate, and based on the fixed packet rate, regenerating, by the receiver node, the first clock frequency by detection of the distance in time between two consecutive data packets received from the asynchronous packet data ne

Abstract: An optical system is provided comprising a first node and a channel drop add device. The first node is configured to transmit data onto an optical fiber in a first line direction. The channel drop add device (501) is adapted to receive and add channels onto the optical fiber thereby transmitting the data into the first and a second line direction. The network further comprises a second node configured to form a transmitter/receiver function. The second node is configured to receive data on said optical fiber from said first and second line directions. Further, the second node is adapted to synchronize received data from said first and second line directions by delaying the data signals seeing the shortest delay, by a delay device.

Abstract: An optical system is provided comprising a first node and a channel drop add device. The first node is configured to transmit data onto an optical fiber in a first line direction. The channel drop add device (501) is adapted to receive and add channels onto the optical fiber thereby transmitting the data into the first and a second line direction. The network further comprises a second node configured to form a transmitter/receiver function. The second node is configured to receive data on said optical fiber from said first and second line directions. Further, the second node is adapted to synchronize received data from said first and second line directions by delaying the data signals seeing the shortest delay, by a delay device.

Abstract: Methods, system, nodes and computer program for transmission of a synchronous data stream having a bitrate, over an asynchronous packet data network between a transmitter node and a receiver node comprising: packaging, by the transmitter node, the synchronous data stream into data packets, transmitting, by the transmitter node, the data packets onto the asynchronous packet data network with a fixed packet rate defined by a first clock frequency which corresponds to the average distance in time between two consecutive data packets transmitted onto the asynchronous packet data network, which is independent of the bitrate of the synchronous data stream, receiving, by the receiver node, the data packets from the asynchronous packet data network detecting, by the receiver node, the fixed packet rate, and based on the fixed packet rate, regenerating, by the receiver node, the first clock frequency by detection of the distance in time between two consecutive data packets received from the asynchronous packet data ne

Abstract: Method in a multi-tone transmission system wherein a usable frequency range of a channel is separated into a plurality of frequency bands, an analogue signal in each sub band being filtered out by a plurality of band pass filters at a receiving side. The method comprises the steps of converting separately the analogue signal in each sub band into a digital signal in a plurality of Analogue-Digital converters (11), each Analogue-Digital converter being associated to one sub band, and activating and deactivating each Analogue-Digital converter in dependence of the presence of a signal in the associated sub band. A plurality of bandpass filters (10) is operatively connected to an analogue line (12) at a receiving side. Each bandpass filter is operatively connected to an Analogue-Digital converter (11) for converting an analogue signal into a digital signal. A control unit (13) is operatively connected to each of said Analogue-Digital converters (11) for activating and deactivating each converter.

Abstract: A device and method for mapping 65-bit DTM slots onto an optical network system that is based on bytes of 8 bits is described. The 64 data bits of each DTM slot are separated from the single control bit. The data bits are then grouped into a set of 8-bit bytes while all the single control bits are grouped into separate control byte groups. The separation of the data bytes from the control bytes eliminates the need for 8B10B encoding and the number of DTM slots may be adapted to the particular optical network used so that the number of bits of the DTM slots is an integral multiple of the size of the optical network interface.