Receiver for CATV system

摘要

The receiver includes a reception unit which receivers downstream data frames including range parameters (R0,R1) and mini slot parameters (MAP). The mini slot parameter defines mini slots (MS0) for new messages and mini slots (MS1) for old messages for the following upstream data frame. A transmission parameter N1 is generated within a range which is defined by the range parameter R1 and a transmission parameter N0 is generated within a range which is defined by the range parameter R0. The transmission parameter N1 is generated when the receiver has to transmit again a reserving request for an old message. The transmission parameters N0 are generated when the receiver has to transmit a reserving request for a new message. The reserving request for the old message is transmitted in a mini slot of an upstream data frame when the parameter N1 corresponds to one of the mini slots MS1 for old messages. The reserving request for the new message is carried out in a mini slot of an upstream data frame, when the parameter N0 corresponds to the mini slots MS0 for old messages.