| 摘要 |
The system has a central station (ZE), several wideband network nodes (BONT) and several subscribers (TN). The nodes are connected to the central station and groups of subscribers are connected to each node. Video and television signals can be transferred from the central station to the subscribers via a forward channel and request signals can be passed for the subscribers to the central station by a return channel. The return channel can be distributed amongst groups of subscribers by a time multiplex method. Individual members of a group have equal access to the part of the channel allocated to the group. Simultaneous transmission of a request signal by different subscribers in a group can be detected by a controller (CONTROL) which prevents their transmission. |
