EP0441393A2
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EP
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A signaling cell switching system
Assignee: Fujitsu Ltd
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Filing: 1991-02-08
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Granted: —
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Expires: 2011-02-08
Abstract
Abstract An index value output circuit (8) outputs an index value in response to a VCI added to the first signalling cell outputted from a terminal unit (2). A switching data output circuit (14) outputs switching data for determining a path for signalling cells, based on the index value. Hence, by revising the index value according to a congestion state of an ATM switch, the above path is dynamically changed. The same index value is inserted in the second and subsequent signalling cells outputted from the terminal unit (2). Because switching data are based on the same index value, all signalling cells from the same terminal units are fed to the same signalling terminator (6).
Inventors
- 👤 Masami Murayama
- 👤 Atsuhisa Takahashi
- 👤 Satoshi Kakuma
- 👤 Shuji Yoshimura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 23:22
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/54; H04L12/56; H04L12/5601; H04L2012/5629; H04L2012/563; H04L2012/5631; H04L2012/5636
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
252 words
A signaling cell switching system in an ATM switch for feeding a signaling cell outputted from a terminal unit to a signaling terminator via a path autonomously formed in a switching network according to switching data inserted into said signaling cell, said signaling cell switching device comprising: an index value outputting means for outputting an index value corresponding to a virtual channel identifier inserted in a first signaling cell outputted from the terminal unit; a switching data output means for outputting switching data corresponding to an index value; an index value selecting means for outputting to said switching data outputting means an index value from said index value outputting means in response to "route unselected" information of a signaling cell, said index value being inserted into a signaling cell in response to "route selected" information of said signaling cell; a data inserting means for inserting said index value outputted from said index value outputting means or said switching data output from said switching data outputting means; and an index value returning control means for returning the index value of said first signaling cell received at said signaling cell terminator back to said terminal unit that sends said first signaling cell: said signaling cell switching device inserting: said "route unselected" information into said first signaling cell outputted from said terminal unit; and said "route selected" information and said index value returned from said index value returning control means in all signaling cells subsequent to said first signaling cell outputted from said terminal unit.
Claim 2
Dependent Claim
60 words
The signaling cell switching device according to claim 1, wherein: said index value outputting means comprises a first table for memorizing index values for respective virtual channel identifiers; and said index value outputting means outputs a corresponding index value by accessing said first table with the virtual channel identifier inserted in the first signaling cell outputted from said terminal unit.
Claim 3
Dependent Claim
48 words
The signaling cell switching device according to claim 1, wherein: said switching data outputting means comprises a second table for memorizing switching data for respective index values; and said switching data outputting means outputs switching data corresponding to the input index value by referring to said second table.
Claim 4
Dependent Claim
32 words
The signaling cell switching device according to claim 1, wherein: said index value or said switching data inserted into said signaling cell is added to a header part of said signaling cell.
Claim 5
Dependent Claim
36 words
The signaling cell switching device according to claim 1, further comprising: an index value revising means for revising the index value output from said index value outputting means according to the state of said switching network.
Claim 6
Dependent Claim
27 words
The signaling cell switching device according to claim 5, wherein: said index value revising means revises said index value according to the workload of said signaling terminator.
Claim 7
Dependent Claim
27 words
The signaling cell switching device according to claim 5, wherein: said index value revising means revises said index value according to the congestion of said switching network.
Claim 8
Dependent Claim
293 words
A signaling cell switching method in an ATM switch for feeding signaling cells outputted from a terminal unit to a signaling terminator over a path autonomously formed in a switching network according to switching data inserted in said signaling cell, said signaling cell switching method utilizing: an index value output step for outputting an index value corresponding to a virtual channel identifier inserted in a first signaling cell transmitted from said terminal units; a first switching data output step for outputting switching data corresponding to said index value; a first signaling cell transmission step for feeding said first signaling cell output from said terminal unit according to said switching data through said switching network to said signaling terminator; a signaling cell return step for inserting said index value in a response cell for returning information corresponding to said first signaling cell terminated in said signaling terminator and for returning said response cell from said signaling terminator through said switching network to said terminal unit; an index value inserting step for inserting in second and subsequent signaling cells, the index value inserted in said response cell and display information indicating that the orders of signaling cells are second and subsequent when said terminal unit outputs said second and subsequent signaling cells after said first signaling cell; a second switching data output step for outputting the same switching data as said switching data outputted to said first signaling cell, in response to said index value and said display information inserted in said second and subsequent signaling cells transmitted from said terminal unit; and a second signaling cell transmission step for feeding said second and subsequent signaling cells transmitted from said terminal unit according to said switching data through said switching network to said signaling terminator.
Claim 9
Dependent Claim
38 words
The signaling cell switching method according to claim 8, further utilizing: an index value revising step for revising the index value to be outputted in said index value outputting step according to the state of said switching network.
References Cited (Backward Citations)
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