H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
344/28
H04Q 3/42 (2006.01) H04L 12/56 (2006.01) H04Q 11/04 (2006.01)
Patent
CA 2034695
ABSTRACT OF THE DISCLOSURE In a packet switching system made up of a single or a plurality of switching nodes or local units each including a label conversion unit for accommodating a plurality of packet circuits and performing conversion into output port information of a switch on the basis of a logic channel on a packet circuit, a self-routing switch for performing switching on the basis of the output port information, and a control unit for termi- nating a control packet and performing the call proces- sing function, and a switching node or tandem unit including a single or a plurality of self-routing switches for interconnecting the local units, there are provided a device for setting, between the tandem unit and a destination-side local unit, the same logic channel as that between an originating-side local unit operative for information transfer and the tandem unit in respect of a call destined for a local unit other than this local unit and a device, operable in the originating-side local unit for information transfer, for inserting output port information of the self- routing switch inside the tandem unit into a packet destined for the local unit other than this local unit, whereby in the tandem unit, setting of logic channel conversion information is not required to be done and even when any control signal packet from the originat- ing-side local unit arrives at the tandem unit, the packet is transferred to the destination-side local unit without undergoing termination of packet and concomitant call processing control.
Gohara Shinobu
Suzuki Taihei
Tanabe Shirou
Hitachi Ltd.
Kirby Eades Gale Baker
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