Patent ID: 7724779
Filing Date: 2010-05-25
Classification: H04L

Abstract:
1. A transmission system having a synchronization control server which supplies, to a plurality of data output servers at a predetermined time interval, synchronization control packets to designate a transmission timing in transmitting isochronous data packets, and a plurality of intermediate devices which mediate transmission of the isochronous data packets and the synchronization control packets, wherein at least one of the intermediate devices comprises: a receiving unit which receives isochronous data packets that are transmitted by a first data output server toward a first destination terminal and isochronous data packets that are transmitted by a second data output server toward a second destination terminal; a buffer which temporarily stores the received isochronous data packets; a determination unit which determines to send the isochronous data packets, at the predetermined time interval, that originate from the first and the second data output servers in a transmission path of said isochronous data packets; and an output unit which outputs the isochronous data packets and non-isochronous data packets in the transmission path; wherein said output unit inhibits output of the non-isochronous data packets in a section going back from an output time of the isochronous data packets to a time corresponding to the maximum length of the non-isochronous data packets, and wherein said output unit outputs with collection of the isochronous data packets, which originate from the first and second data output servers and are temporarily stored at the buffer, to next intermediate device of the transmission path when said determination unit determines to send the isochronous data packets that originate from the first and the second data output servers in the transmission path of said isochronous data packets so that the period when non-isochronous data packets output is inhibited is shortened.