Hitachi, Ltd.

Shirou Tanabe

Yoshito Sakurai

Shinobu Gohara

Hiroshi Kuwahara

Taihei Suzuki

Eiichi Amada

Takao Kato

Kenichi Ohtsuki

Akihiko Takase

Takahiko Kozaki

Nobuo Tsukamoto

Kumiko Takikawa

Kenji Kawakita

Takashi Morita

Hirotoshi Shirasu

Masao Kunimoto

Yukihito Maejima

Yoshiaki Tokita

Yuji Sakamoto

A packet switching system including at least one switching node or local unit each including a label conversion unit for accommodating a plurality of packet circuits and performing conversion into output port information of a switch based on a logic channel on a packet circuit, a self-routing switch for performing switching based on the output port information, and a control unit for terminating a control packet and performing the call processing function. A switching node or tandem unit is provided including at least one self-routing switch for interconnecting the local units. A device is provided 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.

Packet switching system having self-routing switches

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 terminating a control packet and performing the call processing 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 originating 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.

Packet switching system having-having self-routing switches

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, land a control unit for terminating a control packet and performing the call processing 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 originating-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.

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 terminating a control packet and performing the call processing 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 originating-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.

Time-division channel arrangement

A packet switching system which includes a device for setting, between a tandem unit and a destination local unit, the same logic channel as that between an originating local unit operative for information transfer and the tandem unit in respect of a call destined for a local unit other than the originating local unit and a device, operable in the originating-side local unit for information transfer, for inserting output port information of a self-routing switch inside the tandem unit into a packet destined for the local unit other than this local unit; 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 originating local unit arrives at the tandem unit, the packet is transferred to the destination local unit without undergoing termination of packet and concomitant call processing control.

A packet switching system which includes a device for setting, between a tandem unit and a destination local unit, the same logic channel as that between an originating local unit operative for information transfer and the tandem unit in respect of a call destined for a local unit other than the originating local unit and a device, operable in the originating-side local unit for information transfer, for inserting output port information of a self-routing switch inside the tandem unit into a packet destined for the local unit other than this local unit. 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 originating local unit arrives at the tandem unit, the packet is transferred to the destination local unit without undergoing termination of packet and concomitant call processing control.

A digital signal multiplexing method and apparatus include statistically multiplexing packet signals which are transferred through first transmission lines having a first speed to a second transmission line having a second speed, the second speed being higher than the first speed. The method includes the steps of dividing the signal transmitted to the second transmission line through a plurality of logical transmission paths, distributing the packet signals to the plurality of logical transmission paths and transmitting on a packet unit basis, distributing the multiplexed packet signals which are statistically multiplexed to the second transmission line through receiving logical transmission lines corresponding to the plurality of logical transmission lines, and generating the received packet signals from the receiving logical transmission lines; the received packet signals corresponds to the first transmission lines.

Method and apparatus of multiplexing digital signal

A digital signal multiplexing method and apparatus include statistically multiplexing packet signals which are transferred through first circuits having a first speed to a second circuit having a second speed, the second speed being higher than the first speed. The method includes the steps of dividing the signal transmitted to the second circuit into a plurality of circuit management units, distributing the packet signals to the plurality of circuit management units and transmitting on a packet unit basis, dividing the multiplexing packet signals which were statistically multiplexed to the second circuit into receiving circuit management units corresponding to the plurality of circuit management units, and generating the received packet signals included in the receiving circuit management units corresponding to the first circuits.

Method and apparatus for multiplexing digital signal

A switching system which comprises an initial stage including the plurality of first switch devices and in which respective input terminals of the plurality of first switch devices are connected in common to corresponding one incoming highway, and each first switch device selectively delivers to its output terminal an inputted packet in accordance with routing information of the packet so that packets of different outgoing highway numbers are delivered out of the output terminals of the respective first switch devices, and a final stage including the plurality of second switch devices and in which each output terminal of the respective second switch devices is connected to corresponding one outgoing highway, and respective input terminals of a particular second switch device are connected to respective output terminals of the first switch devices which deliver outgoing highways of the same numbers as those of outgoing highways connected to the particular second switch device.

High-speed packet switching system

A method and system are provided for concentrating calls for a packet switching system in a hierarchical communication network. A plurality of terminals communicate with an associated plurality of packet concentrators that, in turn, communicate with switching equipment. The system and method comprise initiating a call at a call terminal to be communicated to the packet concentrator and identifying the call terminal by associating a line number communicating the terminal with the concentrator with a first logical channel number for communication from the packet concentrator to the switching equipment. The logic channel number is recorded in association with the first number line at the packet concentrator whereby call communication back to the call terminal can be made on the proper line number by relating the line number with the logic channel line of the call and thereby avoiding the need to switch logic channels between the concentrator and the switching equipment to avoid costly call processing at the concentrator. Further benefits provided by executing of the general call processing at the switching equipment including tariff control.

Packet concentrator and packet switching system

A communication system including a plurality of portable terminal apparatuses each capable of calling a partner terminal apparatus via a radio channel and a plurality of fixed terminal apparatuses each being connected via an ISDN interface to a time-division switch and each being connectable to the portable terminal in which when two portable terminals having an established cell are respectively attached to two fixed terminal apparatuses arbitrarily selected, the state of the call is automatically transferred to the two fixed terminal apparatuses so that the speech can be achieved between the fixed terminal apparatuses without conducting another call establishing procedure.

Communication system including portable terminals and fixed terminals

In a packet network which includes a plurality of packet switching stations and in which a packet including in its header portion a VPI (Virtual Path Indentifier) for identifying one of logical paths multipliexed on a transmission line and a VCI (Virtual Connection Identifier) for identifying one of logical connections multiplexed on one logical path is communicated between the switching stations, each switching station preliminarily designates a VCI to be given to a packet directed to that station when a logical connection is to be set up between that station and another station. When receiving an information packet from the other station, the each station makes access to header label conversion tables on the basis of a VCI included in the received packet to read internal routing information necessary for a packet switching operation and a VCI to be given to a packet to be delivered.

Packet switch communication network using packet having virtual channel

An I/O prescription table (I/O PTBL) is associated with a processing program module that is executed by a conventional sequential execution type processor. Each processing program module fetches the input data according to its associated I/O PTBL and stores the output data in the same table. An execution control program makes reference to the I/O PTBL associated with the processing program module, updates the designated I/O PTBL so as to indicate that the corresponding input data is prepared, and starts the processing program module associated with the I/O PTBL which is furnished with all of the necessary input data.

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Hachioji, Japan

Shirou Tanabe