| 摘要 |
Ingress stage module (1) for a packet switching fabric (SF) for broadcasting an original video program (OP) to groups of users over at least one dedicated path (a-f) in a network, comprising means for receiving packets of the program (OP), means for extracting a label for each of them and means for storing them, further comprising means for sending to a switching module (5), for each of the packets, the label and the local address wherein it is stored, so that they will be forwarded to egress ports (3a, 3b, 3d, 3e) according to said labels, the program (OP) comprising at least one avail wherein a secondary video program (sp1-sp4) can be inserted, the module (1) comprising a receiver with means for monitoring the program (OP) to detect the occurrence of said avail, and means for sending to a control processor a signal upon such a detection, so that said processor retrieves and transmits packets of a program (sp1-sp4) to the module (1), the module (1) further storing them and sending to the switching module (5) a label for each of them, so that they will be forwarded to said egress ports according to said secondary labels to be inserted in said avail. |
