Patent ID: 7843933
Filing Date: 2010-11-30
Classification: H04L

Abstract:
1. A non-stop switching equipment for packet-based communication links in a transmission system for transmitting image data packet by packet using a plurality of systems of a redundant configuration, comprising: means for selecting packets, which selects packets from the plurality of systems and allows selected packets to pass to an output side of said non-stop switching equipment; means for holding output record information of packets, which holds the record information of packets passed by the packet selecting means; and means for adjusting a phase to absorb an average difference in delay for transmission between the systems at a stage prior to the selecting by the packet selecting means, wherein the packet output record information holding means holds the sequence numbers of the packets as the record information whenever the packet selecting means selects packets and allows the selected packets to pass to the output side, and the packet selecting means determines, when a packet arrives from the respective systems, whether or not the packet has already been passed to the output side, based on the sequence numbers in the packet output record information, interrupts passing of the packet to the output side if already been passed to the output side, and allows the packet to pass to the output side if not already passed.