retransmisji

Retransmission refers to the process of sending a previously transmitted signal or data again. This can occur in various contexts, including telecommunications, broadcasting, and data networks. Retransmission is often necessary when the initial transmission is corrupted, lost, or not received correctly by the intended recipient. The primary goal of retransmission is to ensure the integrity and reliability of the communication.

In telecommunications, retransmission can be used to address issues such as signal fading, interference, or congestion in the network. Techniques like Automatic Repeat reQuest (ARQ) are commonly employed to manage retransmissions. ARQ involves the receiver sending a feedback signal to the sender, indicating whether the data was received correctly. If the data is corrupted or lost, the sender retransmits the data until a successful transmission is confirmed.

In broadcasting, retransmission is used to extend the reach of a signal to areas where the original transmission may not be strong enough. This is often done by relay stations that receive the original signal and then retransmit it to a wider audience. Retransmission is also crucial in digital broadcasting systems, such as DVB (Digital Video Broadcasting), to ensure that viewers receive a clear and uninterrupted signal.

In data networks, retransmission is essential for maintaining the accuracy of data transfers. Protocols like TCP (Transmission Control Protocol) use retransmission to ensure that all data packets are received in the correct order and without errors. If a packet is lost or corrupted during transmission, the protocol will request the retransmission of that packet until it is successfully received.

Retransmission is a fundamental aspect of modern communication systems, enabling the reliable delivery of information despite the challenges posed by signal degradation, interference, and network congestion. By employing various techniques and protocols, retransmission ensures that data and signals are accurately and efficiently transmitted to their intended recipients.