WO1999046954A2 - Atm transmission system - Google Patents
Atm transmission system Download PDFInfo
- Publication number
- WO1999046954A2 WO1999046954A2 PCT/IB1999/000887 IB9900887W WO9946954A2 WO 1999046954 A2 WO1999046954 A2 WO 1999046954A2 IB 9900887 W IB9900887 W IB 9900887W WO 9946954 A2 WO9946954 A2 WO 9946954A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- transmission
- vpi
- virtual
- vci
- atm
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
- H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
- H04Q11/0478—Provisions for broadband connections
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5614—User Network Interface
- H04L2012/5615—Network termination, e.g. NT1, NT2, PBX
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5619—Network Node Interface, e.g. tandem connections, transit switching
- H04L2012/5624—Path aspects, e.g. path bundling
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5629—Admission control
- H04L2012/563—Signalling, e.g. protocols, reference model
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5638—Services, e.g. multimedia, GOS, QOS
- H04L2012/564—Connection-oriented
- H04L2012/5642—Multicast/broadcast/point-multipoint, e.g. VOD
Definitions
- the invention relates to an ATM (Asynchronous Transfer Mode) transmission system, comprising mutually connected transmission exchanges, transmission nodes connected with these exchanges via virtual transmission paths and access means connectable with these nodes via virtual transmission channels for exchanging data in packet or cell form via a transmission combination comprising a virtual transmission channel and a virtual transmission path, in which each cell contains an identification of an activated transmission combination.
- ATM Asynchronous Transfer Mode
- ATM transmission systems have been developed for transporting and exchanging in a uniform way data with different characteristics and properties. Because all ATM cells are provided with an own label (header), cells of different users can be mixed on a transmission connection, so that the transmission means can be used dynamically. For that reason with ATM there is spoken about transmission connections in the form of virtual transmission paths (Virtual Path Connections) (VPCs) and virtual channels (Virtual Channel Connections). Virtual paths can be regarded as semi-permanent connection pipes, switched by the nodes. The throughput capacity of a virtual channel can be chosen according to the need. The virtual channels can be regarded as a dial connection (on demand).
- VPCs Virtual Path Connections
- Virtual channels Virtual Channel Connections
- VPC/VCC virtual channel
- VPC/VCC transmission combinations are utilised in which 8 bits are reserved for choosing a virtual transmission path (Virtual Path Identifier) (VPI) and 16 bits for selecting a virtual transmission channel (Virtual Channel Identifier) (VCI). This means that for exchanging information with more than 256 users, continually a VPI/VCI value us required for identifying a user in question or the access means in question.
- VPN Virtual Path Identifier
- VCI Virtual Channel Identifier
- a large number of transmission nodes will be required for connecting users or their access means to the transmission exchanges. Furthermore, the transmission nodes need to be able to rout the cells sufficiently fast, to prevent undesired delays, which is especially the case for exchanging speech or other so-called real time data.
- the invention provides to this end an ATM transmission system, characterised in that a transmission node comprises connection means for exchanging data with an accompanying transmission exchange of data via a transmission combination comprising a pre-assigned virtual transmission path.
- the invention is based on the understanding that the switching functions of a transmission node can be highly reduced by pre-assigning of default virtual transmission paths for exchanging data between a transmission node and an accompanying transmission exchange.
- connection means are fit out for exchanging data via pre-assigned virtual transmission paths on the basis of desired transmission properties or services such as via pre-assigned virtual transmission paths of different transmission capacity.
- the access to one of the pre-assigned or default virtual transmission paths concerned can be guided on the basis of a subscription or on request, via suitable signalling data.
- connection means can comprise a routing table for selecting assigned virtual transmission paths via in advance adjustable routing data.
- connection means in a transmission node are fit out in such a way, that cells originating from a transmission exchange can be exchanged with one or more of the connected access means and that cells originating from the access means can exclusively be exchanged via one of the assigned virtual transmission paths for exchanging information and signalling data with an exchange.
- a so-called copy function in which data of e.g. a service, in which video data are disseminated on demand, can be simultaneously exchanged with different users or access means.
- the transmission nodes are also provided with means for monitoring the use of a transmission combination according to in advance adjustable user parameters.
- monitoring policing
- the user parameters will in practice mostly be related to the transmission capacity that has been assigned to a user, like e.g. 64 kb/s for telephone and e.g. up to 2 MB/s for data interchange for Internet traffic and the like.
- connection means of a transmission node are fit out for exchanging information and signalling data with an accompanying transmission exchange via separate, pre-assigned virtual transmission paths and in which the signalling data of the access means are joined on one or more virtual transmission paths which are specially assigned for exchanging signalling data.
- the invention also provides transmission nodes provided with connection means and/or monitoring means for application in an ATM transmission system with pre-assigned virtual transmission paths and provides an access means provided with means for disseminating with a cell of a transmission combination comprising a pre-assigned virtual transmission path and means for receiving of a cell with a transmission combination comprising a pre-assigned virtual transmission path, such as described in the above.
- Fig. 1 schematically the exchange of data between a transmission exchange and different users of their access means via an intermediate transmission node in an ATM transmission system, which is known per se.
- Fig. 2 schematically the exchange of data between a transmission exchange and different users or their access means via an intermediate transmission node in an ATM transmission system according to the invention.
- Fig. 3 schematically the monitoring in a transmission node of the data exchange between access means and a transmission exchange in an ATM transmission system according to the invention.
- Fig. 1 shows schematically the make-up of an ATM (asynchronous Transfer Mode) transmission system 1 . Of these, are shown only a single transmission exchange (Switch) (SW) 2, a single transmission node connected herewith (Connection Point) (CP) 2 and some users I, J, K, L to be connected to the transmission node 3 that are provided with access means 4, as is illustrated in more detail for user K.
- a practical ATM transmission system 1 comprises a number of mutually connected transmission exchanges 2 with a plurality of transmission exchanges and access means 4 that are connected to it.
- VPCs virtual transmission paths
- VCCs virtual Channel Connections
- a virtual transmission path and a virtual transmission channel are identified with a transmission combination consisting of an identification of the transmission path (Virtual Path Identifier) (VPI) and an identification of the virtual transmission channel (Virtual Channel Identifier) (VCI).
- the transmission combination concerned or VPI/VCI combination represents in fact a transmission connection via physical media like metallic cables, fibre optic cables and/or radio connections.
- Virtual paths can be selected on the basis of a certain transmission capacity and/or transmission quality.
- VCC Virtual Channel Connections
- the transmission channels concerned are indicated by means of a VCI value (Virtual Channel Identifier).
- VCI Virtual Channel Identifier
- data are exchanged between the access means 4 and the transmission exchange 2 in the form of cells, each having an own label (header), which comprises among others a selected transmission combination, i.e. a VPI/VCI combination.
- the connections between a transmission exchange 2 and the access means 4 of the users, via a transmission node 3, are thus in fact so called dial connections, in which a transmission connection concerned is selected after exchanging signalling information, for which a separate transmission combination, different from the transmission combination for exchanging information, is used. Therefore, in Fig. 1 a distinction is made between exchanging information, such as voice or computer data, indicated by solid double arrows and signalling data, indicated by dashed double arrows.
- a suitable VPI/VCI combination with the transmission exchange 2 is for instance selected on request of the access means 4 by the transmission node 3 and the transmission connection concerned is established.
- a connection from the transmission exchange 2 to a user concerned I, J, K, L a connection is realised by the administration and control means 5 from the transmission node 3 to the user concerned.
- the transmission nodes 3 perform an important switching function by analysing the signalling data and the labels (headers) of the cells to be transported.
- the administration or control means 5 must therefore be fit out with adequate administration and control software in order to establish the desired virtual connections.
- Fig. 2 shows an ATM transmission system 6 according to the invention, comprising a transmission exchange 2, a transmission node 7 and access means 8, with which users I, J, K, L, can exchange information through virtual transmission channels and virtual transmission paths via the transmission node 7 with a transmission exchange 2.
- the virtual transmission paths between the transmission exchange 2 and the transmission node 7 have been pre-assigned in the ATM transmission system 6 according to the invention. That means that the information between a user I, J, K, L, and the transmission exchange 2 cannot be handled through a random virtual transmission path, but is restricted to the pre-assigned default virtual transmission paths concerned, which can have different transmission capacities, if desired.
- connection means 9 in the form of routing tables or other connection means controlling on the basis pre-adjusted data.
- connection means 9 need only to perform a simple translation or mutual imaging of the VCI values concerned.
- This is a so-called copy function, in which for instance video data and other data that are distributed on demand are exchanged simultaneously with different users or access means.
- singular connections between a transmission exchange 2 and a user I, J, K, L are possible.
- Cells originating from the access means 8 can in general be exchanged only via one of the assigned virtual transmission paths for exchanging information and signalling data with an exchange 2.
- the information and signalling data are exchanged with an accompanying transmission exchange 2 via separate, pre-assigned or default virtual transmission paths.
- the transmission node 7 only needs to perform a simple translation of the transmission combination on the path between the transmission node 7 and the access means 8 concerned to the virtual transmission path between the transmission node 7 and the transmission exchange 2 and vice versa.
- the assignment of a default virtual transmission path can be controlled on the basis of a subscription, a desired transmission quality (Quality of Service) (QoS) and other parameter values, among which of course the transmission capacity for e.g. video or voice services.
- QoS Quality of Service
- Monitoring on the right usage of the facilities assigned to a user can, in the embodiment of the ATM transmission system according to the invention, be carried out as illustrated in Fig. 3.
- the access means 8 communicate in this example via three virtual transmission channels and the transmission node 7 with the transmission exchange 2.
- these are a 2 MB/s connection for exchanging computer data and the like, and a 64 kb/s connection for signalling.
- monitoring means 1 1 , 1 2, 1 3 can be applied in the transmission node 7 to prevent improper use of the assigned virtual transmission connection.
- a monitoring function (policing) of the use of the transmission means can also be fit, such as schematically indicated with the monitoring means 14 for information traffic, such as voice, computer data etc. and monitoring means 1 5 for signalling traffic.
- VPI values By the pre-assignment of VPI values, cells with other than the default VPI values can easily be recognised by the monitoring means 1 1 -15 and be removed from the data stream, because these cells are not exchanged via a transmission node 7. This gives an effective monitoring of the correct use of the transmission connections.
- the access means 8 (X-box) are established in such a way, by means of means 16 which are suitable for this purpose, that they place the VPI/VCI values concerned in the labels (headers) of the cells and can recover the VPI/VCI values of labels of cells received via means 17.
- the assigned or default VPI values can be taken up semi-permanently in the access means s8 concerned of the user I, J, K, L, which reduces the complexity of a transmission node even further.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99918216A EP1062836A2 (en) | 1998-03-13 | 1999-03-15 | Atm transmission system |
AU36230/99A AU3623099A (en) | 1998-03-13 | 1999-03-15 | Atm transmission system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL1008583 | 1998-03-13 | ||
NL1008583A NL1008583C2 (en) | 1998-03-13 | 1998-03-13 | ATM transmission system. |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1999046954A2 true WO1999046954A2 (en) | 1999-09-16 |
WO1999046954A3 WO1999046954A3 (en) | 1999-11-04 |
Family
ID=19766737
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB1999/000887 WO1999046954A2 (en) | 1998-03-13 | 1999-03-15 | Atm transmission system |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1062836A2 (en) |
AU (1) | AU3623099A (en) |
NL (1) | NL1008583C2 (en) |
WO (1) | WO1999046954A2 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5469543A (en) * | 1991-08-14 | 1995-11-21 | Nec Corporation | Policing circuits arranged in matrix array for selectively transferring virtual path identifier (VPI) responsive to either VPI or service class identifier (SCI) threshold value |
WO1995032570A1 (en) * | 1994-05-24 | 1995-11-30 | Nokia Telecommunications Oy | Method and equipment for prioritizing traffic in an atm network |
US5627836A (en) * | 1995-01-31 | 1997-05-06 | Bell Atlantic Network Services, Inc. | VPI/VCI administration |
-
1998
- 1998-03-13 NL NL1008583A patent/NL1008583C2/en not_active IP Right Cessation
-
1999
- 1999-03-15 EP EP99918216A patent/EP1062836A2/en not_active Withdrawn
- 1999-03-15 WO PCT/IB1999/000887 patent/WO1999046954A2/en not_active Application Discontinuation
- 1999-03-15 AU AU36230/99A patent/AU3623099A/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5469543A (en) * | 1991-08-14 | 1995-11-21 | Nec Corporation | Policing circuits arranged in matrix array for selectively transferring virtual path identifier (VPI) responsive to either VPI or service class identifier (SCI) threshold value |
WO1995032570A1 (en) * | 1994-05-24 | 1995-11-30 | Nokia Telecommunications Oy | Method and equipment for prioritizing traffic in an atm network |
US5627836A (en) * | 1995-01-31 | 1997-05-06 | Bell Atlantic Network Services, Inc. | VPI/VCI administration |
Non-Patent Citations (2)
Title |
---|
HUBER M N ET AL: "PROPOSED EVOLUTIONARY PATHS FOR B-ISDN SIGNALLING" PROCEEDINGS OF THE INTERNATIONAL SWITCHING SYMPOSIUM, YOKOHAMA, OCT. 25 - 30, 1992, vol. 1, no. SYMP. 14, 25 October 1992 (1992-10-25), pages 334-338, XP000337669 INSTITUTE OF ELECTRONICS;INFORMATION AND COMMUNICATION ENGINEERS * |
ONVURAL R O ET AL: "ENABLING ATM NETWORKS" IBM SYSTEMS JOURNAL, vol. 34, no. 4, 21 September 1995 (1995-09-21), pages 672-692, XP000542406 * |
Also Published As
Publication number | Publication date |
---|---|
NL1008583C2 (en) | 1999-09-20 |
AU3623099A (en) | 1999-09-27 |
EP1062836A2 (en) | 2000-12-27 |
WO1999046954A3 (en) | 1999-11-04 |
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