What are the Transport Protocols used and why IP Multicast?
The solution that we propose is fully compliant with the Internet Protocols: 2-way transmissions between the server and the receivers can be TCP/IP, or UDP Unicast/IP or UDP Multicast/IP depending on technical characteristics of the network and economical requirements. The most frequent situation is to use a TCP/IP connexion between 2 sites in order to deliver media and report back reception and access acknowledgements. When UDP is used then the delivery platform enables methods to check that all packets are received in the correct order and that none is missing: either Forward Error Correction high performance mechanisms to automatically reconstitute possibly lost packets are implemented or the automatic retransmission carrousel of non-received packets is performed until all transmissions are completed. IP multicast is implemented when it comes to transmit the same content to a large number of receivers and when the delivery network allows that. Such approach can be efficient economic
