Patent ID: 8289841

Claim:
A redundant gateway system comprising: a plurality of gateway devices including at least first gateway device and second gateway device positioned between a time division multiplexing (TDM) network and a plurality of packet networks with multiplex structure, and configured to perform TDM conversion on data from multiple packets supplied from the packet networks to generate TDM signals; and a TDM exchange unit configured to switch to the first gateway device from the second gateway device of the plurality of gateway devices to supply the TDM network with only the TDM signal generated by the first gateway device, wherein each of the at least first and second gateway devices includes: a packet interface connected with one of the plurality of packet networks and configured to capture a packet supplied from the connected packet network based on a physical address of the packet; a jitter buffer configured to sequentially store data from each packet captured through the packet interface; and a jitter buffer controller configured to determine a packet read order, read the data stored in the jitter buffer in accordance with the determined packet read order, and supply the thus-read data for the TDM conversion, wherein when the TDM exchange unit switches to the first gateway device from the second gateway device, the jitter buffer controller of the second gateway device notifies the first gateway device of the packet read order determined by the jitter buffer controller of the second gateway device, and the first gateway device determines the same packet read order as the packet read order determined by the jitter buffer controller of the second gateway device.