The O-RAN IP provides delay management service to ensure that it receives correct data over the fronthaul interface despite packet delay variation (PDV). The IP refers to concept and latency models from the eCPRI specification. The IP manages transmission and receiver windows, which you can place relative to the air interface based on predefined or measured transport delay. The IP exchanges RU parameters and network characteristic over M-plane messages. The IP monitors and counts packets transmitted or received out of the window to warn the other node and discard them if necessary. The IP also transmits and receives non-delay managed U-plane traffic for which normal windows are not applicable.