Abstract: The invention relates to a method and a system for the transferring of packet-switched information in a telecommunication system which comprises a router (R) to which an optical cable (LC) is connected that consists of optical fibres (LF) to which two wavelengths of light are sent and which is connected to the telecommunication network (CN), in which method, at the router (R), the piece of address information is received from the address wavelength (AWL) of the optical fibre (LF); and the payload information is received at the router (R) from the payload wavelength (DWL) of the optical fibre (LF). In the method, the payload wavelength (DWL) is routed based on the received piece of address information.

Abstract: The invention relates to an ATM telecommunication switch for switching telecommunication connections, said telecommunication switch comprising incoming lines, outgoing lines, and a switching field for switching any connection from an incoming line to a desired outgoing line, said switching field comprising inputs for supplying connections to said switching field, and outputs for supplying connections out of said switching field. The telecommunication switch of the invention is characterized in that it comprises a pre-selector provided between said incoming lines and said inputs for connecting a desired incoming one of said telecommunication switch to a desired input of the switching field.

Abstract: The invention relates to a method and a system for the transferring of packet-switched information in a telecommunication system which comprises a router (R) to which an optical cable (LC) is connected that consists of optical fibres (LF) to which two wavelengths of light are sent and which is connected to the telecommunication network (CN), in which method, at the router (R), the piece of address information is received from the address wavelength (AWL) of the optical fibre (LF); and the payload information is received at the router (R) from the payload wavelength (DWL) of the optical fibre (LF). In the method, the payload wavelength (DWL) is routed based on the received piece of address information.

Abstract: A method for notifying a frame relay network of traffic congestion in an ATM network. When the ATM network provides a notification of congestion, a management message, which is independent from a user-traffic carrying message, is generated at an interface between the ATM network and the frame relay network and transmitted to the frame relay network sending user traffic to the ATM network.