Patent ID: 7715374

Claim:
A redundancy gateway system, including a plurality of gateway units, configured in a multiplex manner between a packet network and a Time Division Multiplexing (TDM) network, and which performs TDM conversion processing to a plurality of packets supplied from the packet network, by the gateway units, and supplies a resulting TDM signal to the TDM network, the redundancy gateway system comprising: a same packet supply unit that generates a duplicate of the packet and thus supplies packets of the same content to the plurality of gateway units; a common write pointer generating unit that generates, for each of the packets, a common write pointer corresponding to identification information appended to the packet; and a selective supply unit that selectively switches one of the plurality of gateway units and supplies only a TDM signal acquired from the one gateway unit to the TDM network; wherein each of the plurality of gateway units includes at least one jitter buffer, a unit that generates a read pointer for the jitter buffer, and a jitter buffer control unit that writes, for each supplied packet, the packet into the jitter buffer in accordance with the common write pointer corresponding to the packet, and sequentially reads out a written packet from the jitter buffer in accordance with the jitter buffer read pointer and provides it for the TDM conversion processing; wherein the common write pointer generating unit and the read pointer generating unit are provided in each of the plurality of gateway units; and wherein only one gateway unit, corresponding to an operation command generates the write pointer and the read pointer and commonly supplies them to all the gateway units.