Central network entity (101; 200) for allocating an optical channel to a local network node (103, 105, 107, 109; 300) for an optical data transmission in a wavelength-division multiplexing communication network, wherein the central network entity is arranged at a network edge, the central network entity (101; 200) comprising the following: an optical communication interface for receiving optical data via a first optical channel of the wavelength-division multiplexing communication network, and for receiving optical data via a second optical channel of the wavelength-division multiplexing communication network; a processor that is configured - to determine a first probability of data collisions in the first optical channel of the wavelength-division multiplexing communication network on the basis of the received optical data of the first optical channel of the wavelength-division multiplexing communication network, - to determine a second probability of data collisions in the second optical channel of the wavelength-division multiplexing communication network on the basis of the received optical data of the second optical channel of the wavelength-division multiplexing communication network, - wherein the data collisions relate to a simultaneous use of the optical channels by different network subscribers, characterized in that processor is configured - to allocate that optical channel having the lower probability of data collisions to the local network node (103, 105, 107, 109; 300) for the optical data transmission in the wavelength-division multiplexing communication network, - wherein the local network node (103, 105, 107, 109; 300) has the first optical channel allocated to it, - wherein the first probability of data collisions is greater than the second probability of data collisions, and - wherein the processor is designed to initiate a change from the first optical channel to the second optical channel by allocating the second optical channel to the local network node (103, 105, 107, 109; 300) only if the first probability of data collisions exceeds a predetermined threshold value. an optical communication interface for receiving optical data via a first optical channel of the wavelength-division multiplexing communication network, and for receiving optical data via a second optical channel of the wavelength-division multiplexing communication network; a processor that is configured - to determine a first probability of data collisions in the first optical channel of the wavelength-division multiplexing communication network on the basis of the received optical data of the first optical channel of the wavelength-division multiplexing communication network, - to determine a second probability of data collisions in the second optical channel of the wavelength-division multiplexing communication network on the basis of the received optical data of the second optical channel of the wavelength-division multiplexing communication network, - wherein the data collisions relate to a simultaneous use of the optical channels by different network subscribers, characterized in that processor is configured - to allocate that optical channel having the lower probability of data collisions to the local network node (103, 105, 107, 109; 300) for the optical data transmission in the wavelength-division multiplexing communication network, - wherein the local network node (103, 105, 107, 109; 300) has the first optical channel allocated to it, - wherein the first probability of data collisions is greater than the second probability of data collisions, and - wherein the processor is designed to initiate a change from the first optical channel to the second optical channel by allocating the second optical channel to the local network node (103, 105, 107, 109; 300) only if the first probability of data collisions exceeds a predetermined threshold value. - to determine a first probability of data collisions in the first optical channel of the wavelength-division multiplexing communication network on the basis of the received optical data of the first optical channel of the wavelength-division multiplexing communication network, - to determine a second probability of data collisions in the second optical channel of the wavelength-division multiplexing communication network on the basis of the received optical data of the second optical channel of the wavelength-division multiplexing communication network, - wherein the data collisions relate to a simultaneous use of the optical channels by different network subscribers, characterized in that processor is configured - to allocate that optical channel having the lower probability of data collisions to the local network node (103, 105, 107, 109; 300) for the optical data transmission in the wavelength-division multiplexing communication network, - wherein the local network node (103, 105, 107, 109; 300) has the first optical channel allocated to it, - wherein the first probability of data collisions is greater than the second probability of data collisions, and - wherein the processor is designed to initiate a change from the first optical channel to the second optical channel by allocating the second optical channel to the local network node (103, 105, 107, 109; 300) only if the first probability of data collisions exceeds a predetermined threshold value.