EP0439098A2
Expired / Lapsed
EP
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Packet switching system having self-routing switches
Assignee: Hitachi Ltd
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Filing: 1991-01-21
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Granted: —
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Expires: 2011-01-21
Abstract
Abstract In a packet switching system made up of a single or a plurality of switching nodes or local units (l-l to l-k) each including a label conversion unit (26) for accommodating a plurality of packet circuits (8) 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 (3-l; 3-k) for performing switching on the basis of the output port information, and a control unit (6) for terminating a control packet and performing the call processing function, and a switching node or tandem unit (2) including a single or a plurality of self-routing switches (4-l to 4-p) for interconnecting the local units, there are provided a device (7) 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 (7), 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.
Inventors
- 👤 Shirou Tanabe
- 👤 Taihei Suzuki
- 👤 Shinobu Gohara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 11:05
CPC Classifications
H; H04; H04L; H04L49/00; H04L49/30; H04L49/3009; H04L12/00; H04L12/54; H04L12/56; H04L12/5601; H04L49/10; H04L49/104; H04L49/105; H04L49/106; H04L49/15; H04L49/1553; H04L49/1584; H04L49/25; H04L49/253; H04L49/255; H04L49/256; H04L49/3081; H04L49/309; H04Q; H04Q11/00; H04Q11/04; H04Q11/0421; H04L2012/5629; H04L2012/563; H04L2012/5631; H04L2012/5632; H04L2012/5678; H04L2012/568; H04L49/1507; H04L49/50
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
248 words
A packet switching system comprising: one or a plurality of local units (l-l to l-k) each accommodating a plurality of packet circuits (8), each of said local units including label conversion means (26), a self-routing switch (3-l; 3-k) and control means (6) for performing call processing control in respect of a control packet, said label conversion means being operable to generate output port information of said switch from a logic channel on said packet circuit and said self-routing switch being operable to effect self-routing on the basis of the output port information; and a tandem unit (2) including at least one self-routing switch for interconnecting said local units; each of said local units further including means (7) for setting, between said 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 said tandem unit in respect of a call destined for a local unit other than this local unit and means (7), operable in the originating-side local unit for information transfer, for inserting output port information of the self-routing switch inside said tandem unit into a packet destined for the local unit other than this local unit, whereby in said tandem unit, setting of logic channel conversion information is not required to be done and even when any control signal packet from said originating-side local unit arrives at said tandem unit, said packet is transferred to said destination-side local unit without undergoing call processing control.
Claim 2
Dependent Claim
72 words
A packet switching system according to Claim 1 wherein said destination-side local unit operative for information transfer is so constructed as to determine a logic channel of a reception call (120 to 122 in Fig. 12), whereby different logic channels are allotted to calls from a plurality of different local units so that logic connection may be identified by only a logic channel number VCI without resort to said originating-side local unit.
Claim 3
Dependent Claim
104 words
A packet switching system according to Claim 1 wherein when a plurality of packet circuits exist between the originating-side local unit and destination-side local unit, said originating-side local unit is so constructed as to transfer to said destination-side local unit a start signal including a circuit use condition between said originating-side local unit and tandem unit, and said destination-side local unit is so constructed as to select a circuit in accordance with said use condition and a circuit use condition between said destination-side local unit and tandem unit and transmit a start completion signal to inform said originating-side local unit of the selected circuit.
Claim 4
Dependent Claim
268 words
A packet switching system comprising: a plurality of local units (l-l to l-k) each accommodating a plurality of packet circuits (8), each of said local units including label conversion means (26), a self-routing switch (3-l; 3-k) and control means (6) for performing call processing control in respect of a control packet, said label conversion means being operable to generate output port information of said switch from a logic channel on said packet circuit and said self-routing switch being operable to effect self-routing on the basis of the output port information; and a tandem unit (2) including at least one self-routing switch for interconnecting said local units; each of said local units further including means (7) for setting, between said tandem unit and a destination-side local unit, the same logic channel as that between an originating-side local unit for information transfer and said tandem unit in respect of a call destined for a local unit other than this local unit and means (7), operable in the originating-side local unit operative for information transfer, for inserting output port information of the self-routing switch inside said tandem unit into a packet destined for the local unit other than this local unit; at least two of said plurality of local units accommodating packet circuits which are of the same outgoing route circuit; each of said two local units having means (182 in Fig. 15) for storing the bandwidth allotment state in respect of each outgoing route so that a local unit originating an outgoing route call may select a local unit which accommodates a circuit of the outgoing route permissible for allotment.
Claim 5
Dependent Claim
65 words
A packet switching system according to Claim 4 wherein each of said at lest two local units has means (205) operable to indicate said bandwidth allotment state in terms of at least one threshold value and when said threshold is exceeded upon setting of outgoing route call or release of outgoing route call, inform all of the other local units that said threshold is exceeded.
Claim 6
Dependent Claim
40 words
A packet switching system according to Claim 5 wherein said threshold value (α in Fig. 15) is different for the time that the outgoing route call setting is effected and the time that the outgoing route call release is effected.
Claim 7
Dependent Claim
35 words
A packet switching system according to Claim 6 wherein desired one of said two local units transmits said bandwidth allotment state in respect of each outgoing route periodically to all of the other local units.
Claim 8
Dependent Claim
196 words
A packet switching system comprising: one or a plurality of local units each accommodating a plurality of packet circuits (8), each of said local units including label conversion means, a self-routing switch and control means (6) for performing call processing control in respect of a control packet, said label conversion means being operable to generate output port information of said switch from a logic channel on said packet circuit and said self-routing switch being operable to effect self-switching on the basis of the output port information; and a tandem unit (2) including at least one self-routing switch (4-l; 4-p) for interconnecting said local units, and at least one self-routing switch (255) connected to a trunk network (251) or to said trunk network and at least one of said plurality of local units, whereby a packet is switched which is present in a call between local units, a leaving and connecting call transmitted from one local unit to said trunk network, an incoming call from said trunk network and destined for one local unit and a call from said trunk network and subjected to routing to a different trunk network without arriving at said packet switching system.
References Cited (Backward Citations)
No citation records indexed.
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