EP0406759A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
System for controlling data transmission in an ATM switching network
Assignee: Fujitsu Ltd
•
Filing: 1990-07-02
•
Granted: —
•
Expires: 2010-07-02
Abstract
Abstract A transmission control system includes an ATM switching network (3), terminals (1-1 - 1-n, 1′-n) and terminal adapters (2-1 - 2-n) respectively connected to the plurality of terminals. The transmission control system also includes a table circuit (4) registering virtual channels presently formed in the ATM switching network in a management table, and a retrieval part (5) for receiving a communication request from one of the terminals and for determining whether or not the management table registers a virtual channel corresponding to the communication request at present. Data output from the one of the terminals is transferred to a different one of the terminals addressed by the communication request through the virtual channel corresponding to the communication request and corresponding two of the terminal adapters when the retrieval part determines that the management table has the virtual channel corresponding to the communication request. A virtual channel setting part (5) registers the virtual channel corresponding to the communication request in the management table when the retrieval processor determines that the management table does not have the virtual channel corresponding to the communication request. Data output from the one of the terminals is transferred to the different one of the terminals addressed by the communication request through the virtual channel registered in the management table by the virtual channel setting part.
Inventors
- 👤 Ryuji Hyodo
- 👤 Eisuke Iwabuchi
- 👤 Tetsuo Nishino
- 👤 Osamu Isono
- 👤 Tetsuo Tachibana
- 👤 Toshimasa Fukui
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 12:03
CPC Classifications
H; H04; H04L; H04L49/00; H04L49/30; H04L49/3081; H04L49/25; H04L49/253; H04Q; H04Q11/00; H04Q11/04; H04Q11/0428; H04Q11/0478; H04L12/00; H04L12/54; H04L12/56; H04L12/5601; H04L2012/5614; H04L2012/5615; H04L2012/5616; H04L2012/5629; H04L2012/563; H04L2012/5631; H04L2012/5632; H04L2012/5638; H04L2012/5645
Claims Analysis
Total Claims: 45
Claim 1
Independent Claim
298 words
A transmission control system including: an asynchronous transfer mode (ATM) switching network (3, 13, 33); a plurality of terminals (1-1 - 1-n, 1′-n); and a plurality of terminal adapters (2-1 - 2-n, 12, 32) respectively connected to said plurality of terminals, each of said terminal adapters coupling a corresponding one of said terminals to said ATM switching network, data being transferred between said terminals through corresponding terminal adapters from among said terminal adapters and said ATM switching network, characterized in that said transmission control system comprises: management table means (4, 27, 56) for registering virtual channels presently formed in said ATM switching network in a management table (4, 27, 56), each of said virtual channels mutually connecting corresponding two of said terminal adapters through said ATM switching network; retrieval means (5, 28, 57) for receiving a communication request from one of said terminals and for determining whether or not said management table registers a virtual channel corresponding to said communication request at present, data output from said one of the terminals being transferred to a different one of the terminals addressed by said communication request through the virtual channel corresponding to said communication request and corresponding two of said terminal adapters when said retrieval means determines that said management table has the virtual channel corresponding to said communication request; and virtual channel setting means (5, 29, 58) for registering the virtual channel corresponding to said communication request in said management table when said retrieval means determines that said management table does not have the virtual channel corresponding to said communication request, data output from said one of the terminals being transferred to said different one of the terminals addressed by said communication request through the virtual channel registered in said management table by said virtual channel setting means.
Claim 2
Dependent Claim
298 words
A transmission control system including: an asynchronous transfer mode (ATM) switching network (3, 13, 33); a plurality of terminals (1-1 - 1-n, 1′-n); and a plurality of terminal adapters (2-1 - 2-n, 12, 32) respectively connected to said plurality of terminals, each of said terminal adapters coupling a corresponding one of said terminals to said ATM switching network, data being transferred between said terminals through corresponding terminal adapters from among said terminal adapters and said ATM switching network, characterized in that said transmission control system comprises: management table means (4, 27, 56) for registering virtual channels presently formed in said ATM switching network in a management table (4, 27, 56), each of said virtual channels mutually connecting corresponding two of said terminal adapters through said ATM switching network; retrieval means (5, 28, 57) for receiving a communication request from one of said terminals and for determining whether or not said management table registers a virtual channel corresponding to said communication request at present, data output from said one of the terminals being transferred to a different one of the terminals addressed by said communication request through the virtual channel corresponding to said communication request and corresponding two of said terminal adapters when said retrieval means determines that said management table has the virtual channel corresponding to said communication request; and virtual channel setting means (5, 29, 58) for registering the virtual channel corresponding to said communication request in said management table when said retrieval means determines that said management table does not have the virtual channel corresponding to said communication request, data output from said one of the terminals being transferred to said different one of the terminals addressed by said communication request through the virtual channel registered in said management table by said virtual channel setting means.
Claim 3
Dependent Claim
53 words
A transmission control system as claimed in claim 1, characterized by further comprising virtual channel releasing means (29, 58), coupled to said management table means, for deleting said virtual channels from said management table (4) of said management table means when a predetermined condition is satisfied, so that said virtual channels are released.
Claim 4
Dependent Claim
63 words
A transmission control system as claimed in claim 2, characterized by further comprising timer means (21, 29, 58) for periodically measuring a predetermined time, wherein said virtual channel releasing means (5, 29, 58) comprises means for deleting all of said virtual channels from said management table when said timer means indicates the predetermined time, so that all of said virtual channels are released.
Claim 5
Dependent Claim
92 words
A transmission control system as claimed in claim 2, characterized by further comprising count means (21, 29, 58) for counting a number of times that each of said virtual channels registered in said management table (4, 27, 56) has been used and for comparing the number of times obtained for each of said virtual channels with a predetermined number of times, wherein said virtual channel releasing means comprises means (5, 29, 58) for deleting, from said management table, a virtual channel which has been used less than said predetermined number of times.
Claim 6
Dependent Claim
95 words
A transmission control system as claimed in claim 2, characterized by further comprising timer means (21, 29, 58) for measuring a passage time from a time (T) when each of said virtual channels registered in said management table (4, 27, 56) was last used and for comprising said passage time obtained for each of said virtual channels with a predetermined threshold time, wherein said virtual channel releasing means comprises means (5, 29, 58) for deleting, from said management table, a virtual channel which has a passage time which is longer than said predetermined threshold time.
Claim 7
Dependent Claim
87 words
A transmission control system as claimed in claim 2, characterized by further comprising determining means (5, 29, 58) for determining whether or not said management table has an idle area which is sufficient to register a new virtual channel, wherein said virtual channel releasing means comprises means (5, 29, 58) for releasing at least one of said virtual channels from said management table when said determining means determines that said management table does not have an idle area which is sufficient to register the new virtual channel.
Claim 8
Dependent Claim
92 words
A transmission control system as claimed in claim 6, characterized by further comprising count means (5, 21, 29) for counting a number of times that each of said virtual channels registered in said management table (4, 29, 58) has been used and for comparing the number of times obtained for each of said virtual channels with a predetermined number of times, wherein said means of the virtual channel releasing means deletes (5, 29, 58), from said management table, a virtual channel which has been used less than said predetermined number of times.
Claim 9
Dependent Claim
90 words
A transmission control system as claimed in claim 6, characterized by further comprising timer means (5, 21, 29) for measuring a passage time from a time when each of said virtual channels registered in said management table was last used and for comprising said passage time obtained for each of said virtual channels with a predetermined threshold time, wherein said means (5, 29, 58)of the virtual channel releasing means deletes, from said management table, a virtual channel which has a passage time which is longer than said predetermined threshold time.
Claim 10
Dependent Claim
37 words
A transmission control system as claimed in claim 2, characterized in that said management table (4, 27, 56) includes a flag which inhibits a corresponding one of the virtual channels from being deleted from said management table.
Claim 11
Dependent Claim
68 words
A transmission control system as claimed in any of claims 1 to 9, characterized in that said management table (4, 27, 56) includes a first area which registers an address (AD) of each of said terminals related to said virtual channels registered in said management table, and a second area which registers an identification number (VCI/VPI) of each of said virtual channels presently registered in said management table.
Claim 12
Dependent Claim
81 words
A transmission control system as claimed in claim 5, characterized in that said management table (4, 27, 56) includes a first area which registers an address (AD) of each of said terminals related to said virtual channels registered in said management table, a second area which registers an identification number (VCI/VPI) of each of said virtual channels presently registered in said management table, and a third area which registers said time (T) when each of said virtual channels was last used.
Claim 13
Dependent Claim
27 words
A transmission control system as claimed in any of claims 1 to 11, characterized in that said data comprises cells, each having a predetermined length of data.
Claim 14
Dependent Claim
86 words
A transmission control system as claimed in any of claims 1 to 12, characterized in that each of said terminal adapters comprises request means (5, 29) for generating a virtual channel setting request when said retrieval means determines that said management table does not have the virtual channel corresponding to said communication request and for sending said virtual channel setting request to said ATM switching network, so that the virtual channel is formed in said ATM switching network in response to said virtual channel setting request.
Claim 15
Dependent Claim
72 words
A transmission control system as claimed in claim 13, characterized in that: said ATM switching network (33) comprises means (53) for informing said virtual channel setting means of the fact that the virtual channel is formed in response to said virtual channel setting request; and said virtual channel setting means (5, 29, 58) registers said virtual channel in said management table when said virtual channel setting means is informed of said fact.
Claim 16
Dependent Claim
286 words
A transmission control system including: an asynchronous transfer mode (ATM) switching network (3, 13); a plurality of terminals (1-1 - 1-n, 1′-n); and a plurality of terminal adapters (2-1 - 2-n, 12) respectively connected to said plurality of terminals, each of said terminal adapters coupling a corresponding one of said terminals to said ATM switching network, data being transferred between terminals through corresponding terminal adapters from among said terminal adapters and said ATM switching network, characterized in that each of said terminal adapters comprises: management table means (4, 27) for registering virtual channels presently formed in said ATM switching network in a management table (4, 27), each of said virtual channels being coupled to another one of said terminal adapters through said ATM switching network; retrieval means (5, 28) for receiving a communication request from one of said terminals and for determining whether or not said management table registers a virtual channel corresponding to said communication request at present, data output from said one of the terminals being transferred to a different one of said terminals addressed by said communication request through the virtual channel corresponding to said communication request when said retrieval means determines that said management table has the virtual channel corresponding to said communication request; and virtual channel setting means (5, 29) for registering the virtual channel corresponding to said communication request in said management table when said retrieval means determines that said management table does not have the virtual channel corresponding to said communication request, data output from said one of the terminals being transferred to said different one of the terminals addressed by said communication request through the virtual channel registered in said management table by said virtual channel setting means.
Claim 17
Dependent Claim
286 words
A transmission control system including: an asynchronous transfer mode (ATM) switching network (3, 13); a plurality of terminals (1-1 - 1-n, 1′-n); and a plurality of terminal adapters (2-1 - 2-n, 12) respectively connected to said plurality of terminals, each of said terminal adapters coupling a corresponding one of said terminals to said ATM switching network, data being transferred between terminals through corresponding terminal adapters from among said terminal adapters and said ATM switching network, characterized in that each of said terminal adapters comprises: management table means (4, 27) for registering virtual channels presently formed in said ATM switching network in a management table (4, 27), each of said virtual channels being coupled to another one of said terminal adapters through said ATM switching network; retrieval means (5, 28) for receiving a communication request from one of said terminals and for determining whether or not said management table registers a virtual channel corresponding to said communication request at present, data output from said one of the terminals being transferred to a different one of said terminals addressed by said communication request through the virtual channel corresponding to said communication request when said retrieval means determines that said management table has the virtual channel corresponding to said communication request; and virtual channel setting means (5, 29) for registering the virtual channel corresponding to said communication request in said management table when said retrieval means determines that said management table does not have the virtual channel corresponding to said communication request, data output from said one of the terminals being transferred to said different one of the terminals addressed by said communication request through the virtual channel registered in said management table by said virtual channel setting means.
Claim 18
Dependent Claim
57 words
A transmission control system as claimed in claim 15, characterized in that each of said terminal adapters comprises virtual channel releasing means (5, 29), coupled to said management table means, for deleting said virtual channels from said management table of said management table means when a predetermined condition is satisfied, so that said virtual channels are released.
Claim 19
Dependent Claim
68 words
A transmission control system as claimed in claim 16, characterized in that each of said terminal adapters comprises timer means (21, 29) for periodically measuring a predetermined time, and in that said virtual channel releasing means comprises means (5, 29) for deleting all of said virtual channels from said management table when said timer means indicates the predetermined time, so that all of said virtual channels are released.
Claim 20
Dependent Claim
95 words
A transmission control system as claimed in claim 16, characterized in that each of said terminal adapter means comprises count means (21, 29) for counting a number of times that each of said virtual channels registered in said management table has been used and for comparing the number of times obtained for each of said virtual channels with a predetermined number of times, and in that said virtual channel releasing means comprises means (5, 29) for deleting, from said management table, a virtual channel which has been used less than said predetermined number of times.
Claim 21
Dependent Claim
97 words
A transmission control system as claimed in claim 16, characterized in that each of said terminal adapters comprises timer means (21, 29) for measuring a passage time from a time (T) when each of said virtual channels registered in said management table was last used and for comprising said passage time obtained for each of said virtual channels with a predetermined threshold time, and in that said virtual channel releasing means comprises means (5, 29) for deleting, from said management table, a virtual channel which has a passage time which is greater than said predetermined threshold time.
Claim 22
Dependent Claim
92 words
A transmission control system as claimed in claim 16, characterized in that each of said terminal adapters comprises determining means (5, 29) for determining whether or not said management table has an idle area which is sufficient to register a new virtual channel, and in that said virtual channel releasing means comprises means (5, 29) for releasing at least one of said virtual channels from said management table when said determining means determines that said management table does not have an idle area which is sufficient to register the new virtual channel.
Claim 23
Dependent Claim
92 words
A transmission control system as claimed in claim 20, characterized in that each of said terminal adapters comprises count means (5, 29) for counting a number of times that each of said virtual channels registered in said management table has been used and for comparing the number of times obtained for each of said virtual channels with a predetermined number of times, and in that said means of the virtual channel releasing means deletes, from said management table, a virtual channel which has been used less than said predetermined number of times.
Claim 24
Dependent Claim
95 words
A transmission control system as claimed in claim 20, characterized in that each of said terminal controllers comprises timer means (5, 29) for measuring a passage time from a time (T) when each of said virtual channels registered in said management table was last used and for comprising said passage time obtained for each of said virtual channels with a predetermined threshold time, and in that said means of the virtual channel releasing means deletes, from said management table, a virtual channel which has a passage time which is longer than said predetermined threshold time.
Claim 25
Dependent Claim
36 words
A transmission control system as claimed in claim 16, characterized in that said management table (4, 27) includes a flag which inhibits a corresponding one of the virtual channels from being deleted from said management table.
Claim 26
Dependent Claim
68 words
A transmission control system as claimed in any of claims 15 to 23, characterized in that said management table (4, 27) includes a first area which registers an address (AD) of each of said terminals related to said virtual channels registered in said management table, and a second area which registers an identification number (VCI/VPI) of each of said virtual channels registered in said management table at present.
Claim 27
Dependent Claim
79 words
A transmission control system as claimed in claim 21, characterized in that said management table includes a first area which registers an address (AD) of each of said terminals related to said virtual channels registered in said management table, a second area which registers an identification number (VCI/VPI) of each of said virtual channels registered in said management table at present, and a third area which registers said time (T) when each of said virtual channels was last used.
Claim 28
Dependent Claim
27 words
A transmission control system as claimed in any of claims 15 to 25, characterized in that said data comprises cells, each having a predetermined length of data.
Claim 29
Dependent Claim
86 words
A transmission control system as claimed in any of claims 15 to 26, characterized in that each of said terminal adapters comprises request means (5, 29) for generating a virtual channel setting request when said retrieval means determines that said management table does not have the virtual channel corresponding to said communication request and for sending said virtual channel setting request to said ATM switching network, so that the virtual channel is formed in said ATM switching network in response to said virtual channel setting request.
Claim 30
Dependent Claim
69 words
A transmission control system as claimed in claim 27, characterized in that: said ATM switching network comprises (13) means (53) for informing said virtual channel setting means of the fact that the virtual channel is formed in response to said virtual channel setting request; and said virtual channel setting means registers said virtual channel in said management table when said virtual channel setting means is informed of said fact.
Claim 31
Dependent Claim
289 words
A transmission control system including: an asynchronous transfer mode (ATM) switching network (3, 33); a plurality of terminals (1-1 - 1-n, 1′-n); and a plurality of terminal adapters (2-1 - 2-n, 32) respectively connected to said plurality of terminals, each of said terminal adapters coupling a corresponding one of said terminals to said ATM switching network, data being transferred between said terminals through corresponding terminal adapters from among said terminal adapters and said ATM switching network, characterized in that said ATM switching network includes: management table means (4, 56) for registering virtual channels presently formed in said ATM switching network in a management table, each of said virtual channels mutually connecting corresponding two of said terminal adapters through said ATM switching network; retrieval means (5, 57) for receiving a communication request from one of said terminals and for determining whether or not said management table presently registers a virtual channel corresponding to said communication request, data output from said one of the terminals being transferred to a different one of the terminals addressed by said communication request through the virtual channel corresponding to said communication request and corresponding two of said terminal adapters when said retrieval means determines that said management table has the virtual channel corresponding to said communication request; and virtual channel setting means (5, 58) for registering the virtual channel corresponding to said communication request in said management table when said retrieval means determines that said management table does not have the virtual channel corresponding to said communication request, data output from said one of the terminals being transferred to said different one of the terminals addressed by said communication request through the virtual channel registered in said management table by said virtual channel setting means.
Claim 32
Dependent Claim
289 words
A transmission control system including: an asynchronous transfer mode (ATM) switching network (3, 33); a plurality of terminals (1-1 - 1-n, 1′-n); and a plurality of terminal adapters (2-1 - 2-n, 32) respectively connected to said plurality of terminals, each of said terminal adapters coupling a corresponding one of said terminals to said ATM switching network, data being transferred between said terminals through corresponding terminal adapters from among said terminal adapters and said ATM switching network, characterized in that said ATM switching network includes: management table means (4, 56) for registering virtual channels presently formed in said ATM switching network in a management table, each of said virtual channels mutually connecting corresponding two of said terminal adapters through said ATM switching network; retrieval means (5, 57) for receiving a communication request from one of said terminals and for determining whether or not said management table presently registers a virtual channel corresponding to said communication request, data output from said one of the terminals being transferred to a different one of the terminals addressed by said communication request through the virtual channel corresponding to said communication request and corresponding two of said terminal adapters when said retrieval means determines that said management table has the virtual channel corresponding to said communication request; and virtual channel setting means (5, 58) for registering the virtual channel corresponding to said communication request in said management table when said retrieval means determines that said management table does not have the virtual channel corresponding to said communication request, data output from said one of the terminals being transferred to said different one of the terminals addressed by said communication request through the virtual channel registered in said management table by said virtual channel setting means.
Claim 33
Dependent Claim
56 words
A transmission control system as claimed in claim 29, characterized in that said ATM switching network comprises virtual channel releasing means (5, 58), coupled to said management table means, for deleting said virtual channels from said management table of said management table means when a predetermined condition is satisfied, so that said virtual channels are released.
Claim 34
Dependent Claim
68 words
A transmission control system as claimed in claim 30, characterized in that said ATM switching network comprises comprising timer means (53, 58) for periodically measuring a predetermined time, and in that said virtual channel releasing means comprises means (5, 58) for deleting all of said virtual channels from said management table when said timer means indicates the predetermined time, so that all of said virtual channels are released.
Claim 35
Dependent Claim
93 words
A transmission control system as claimed in claim 30, characterized in that said ATM switching network comprises count means (53, 58) for counting a number of times that each of said virtual channels registered in said management table has been used and for comparing the number of times obtained for each of said virtual channels with a predetermined number of times, and in that said virtual channel releasing means comprises means (5, 58) for deleting, from said management table, a virtual channel which has been used less than said predetermined number of times.
Claim 36
Dependent Claim
96 words
A transmission control system as claimed in claim 30, characterized in that said ATM switching network comprises timer means (5, 58) for measuring a passage time from a time (T) when each of said virtual channels registered in said management table was last used and for comprising said passage time obtained for each of said virtual channels with a predetermined threshold time, and in that said virtual channel releasing means comprises means (5, 58) for deleting, from said management table, a virtual channel which has a passage time which is longer than said predetermined threshold time.
Claim 37
Dependent Claim
91 words
A transmission control system as claimed in claim 30, characterized in that said ATM switching network comprises determining means (5, 58) for determining whether or not said management table has an idle area which is sufficient to register a new virtual channel, and in that said virtual channel releasing means comprises means (5, 58) for releasing at least one of said virtual channels from said management table when said determining means determines that said management table does not have an idle area which is sufficient to register the new virtual channel.
Claim 38
Dependent Claim
91 words
A transmission control system as claimed in claim 34, characterized in that said ATM switching network comprises count means (5, 58) for counting a number of times that each of said virtual channels registered in said management table has been used and for comparing the number of times obtained for each of said virtual channels with a predetermined number of times, and in that said means of the virtual channel releasing means deletes, from said management table, a virtual channel which has been used less than said predetermined number of times.
Claim 39
Dependent Claim
92 words
A transmission control system as claimed in claim 34, characterized in that said ATM switching network comprises timer means (5, 58) for measuring a passage time from a time when each of said virtual channels registered in said management table was last used and for comprising said passage time obtained for each of said virtual channels with a predetermined threshold time, in that said means of the virtual channel releasing means deletes, from said management table, a virtual channel which has a passage time which is greater than said predetermined threshold time.
Claim 40
Dependent Claim
36 words
A transmission control system as claimed in claim 30, characterized in that said management table (4, 56) includes a flag which inhibits a corresponding one of the virtual channels from being deleted from said management table.
Claim 41
Dependent Claim
67 words
A transmission control system as claimed in any of claims 29 to 37, characterized in that said management table (4, 56) includes a first area which registers an address (AD) of each of said terminals related to said virtual channels registered in said management table, and a second area (VCI/VPI) which registers an identification number of each of said virtual channels presently registered in said management table.
Claim 42
Dependent Claim
78 words
A transmission control system as claimed in claim 34, characterized in that said management table includes a first area which registers an address (AD) of each of said terminals related to said virtual channels registered in said management table, a second area which registers an identification number (VCI/VPI) of each of said virtual channels presently registered in said management table, and a third area which registers said time (T) when each of said virtual channels was last used.
Claim 43
Dependent Claim
27 words
A transmission control system as claimed in any of claims 29 to 39, characterized in that said data comprises cells, each having a predetermined length of data.
Claim 44
Dependent Claim
79 words
A transmission control system as claimed in any of claims 29 to 40, characterized in that each of said terminals comprises request means for generating a virtual channel notice request subsequent to said communication request and for sending the same to said ATM switching network, and in that said ATM switching network comprises means (53) for sending back each said terminal information about the virtual channel obtained by said control means in response to said virtual channel notice request.
Claim 45
Dependent Claim
52 words
A transmission control system as claimed in claim 41, characterized in that when said retrieval means (5, 55) determines that said management table does not have the virtual channel corresponding to said communication request, said virtual channel setting means registers the virtual channel corresponding to said communication request in said management table.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.