DE3343280A1 - MESSAGING SYSTEM - Google Patents

Description

F.H. Rees 28

Messaging system

The invention relates to a message switching system according to the preamble of the main claim.

In the German patent specification 12 83 296 a message switching system is described / in which a Ver center contains two coupling fields. A coupling field serves to mediate telephone users, the other serves to mediate text participants. Each coupling field has its own control equipment, other parts of which Controls are connected to both heads. the Other parts of the control are used to process the switching order, especially when a participant is assigned to has access to both coupling fields, these two switching fields are required during the same connection.

The invention is based on the object of continuing the principles on which the aforementioned German patent is based to expand.

The object is achieved according to the invention by a news management system according to the teaching of the main claim.

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Advantageous refinements of the invention can be found in the subclaims.

The use of the invention in a fully electronic connection network is described, which of a NUMBER OF FULLY DIGITAL EXCHANGE POINTS THAT connected to each other by digital transmission paths are. In the majority of cases it is Time division multiplex PCM paths. The subscriber connection lines can at the same time be operated fully digitally, they however, in some cases between the participant and the associated subscriber connection unit in the Vermi tt Lungsste I Le anaLog. It is about a messaging system with multilevel architecture; one of the levels is a control level, the other Levels are communication levels. In this respect it is very similar to that mentioned above German patent 12 83 296 described system. However, the present system expands those described there Principles strong.

In a digital interconnection network of the one described above Type intended for voice connections only a connection level for control and signaling available, the one level with circuit exchanges controls. This works, for example, at 64 kb / s. in the In the present system, one or more switching levels are also provided. This opens up further possibilities that are required if a system is to be expandable for various digital performance features, for example an Integrated Services DigitaL Network (ISDN). Such a level can convey more broadband information than is the case with voice communication.

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Lung is required. Another level can be used for data packet switching be provided. Further such levels are controlled from the original control level. The control level only needs relatively little for this be modified.

The full given by an arrangement according to the invention Integration of control, in which a single control and signaling level serves all switching levels, offers great advantages in terms of construction and operation of the system. If necessary, services can be offered involving various institutions Belong to levels of the connection network. For example a participant in a normal telephone conversation can die Capacity of 64 kb / s if desired for a short time during the call by adding a broadband connection expand. Such an extension could be one or both directions. Because such connections are more expensive as a normal telephone conversation, it is useful such To be able to establish connections for a short time if necessary.

In some cases the routing is done by the system be different within each level, especially when one level is relatively underdeveloped compared to another. The broadband routes that don't are as busy as the others, for example run through two or more exchanges, while the more frequented services run through direct ones Running paths. In this way, the controlled switching levels considerable differences among each other exhibit. Newer technical developments, for example the upcoming fiber optic transmission technology with the far higher possible bit rates enable the establishment

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broadband networks that are more attractive than previous ones Networks. It is possible that a broadband level is two or more has more sub-levels, for example one for the There and one for the return direction ^ connections between two levels run via multiplexers to the sub-levels and broadband coupling networks within the sub-levels Such coupling networks generally consist of a large number of very fast gates.

In the case of data packet switching, both a ΡΙΟ channel (8 kb / s) or a b-channel (64 kb / s) can be accessed will. A subscriber is therefore able, depending on the type of connection desired between the to choose both types of channels. This choice would involve requesting an additional service, for example by dialing a special code. The D channel also transmits signaling information between a Subscriber circuit and the subscribers that are required for control purposes.

In the following, the invention is further explained with reference to the embodiment shown in the drawing. A packet network is attached to a telephone network operating digitally in time division multiplex (TDM). A digital concentrator unit is for this purpose In addition, a package module control unit 1 is attached at the level of the package network. The concentrator contains a PCM switching network 2, known as a DSSS switching network; this is the main element of the concentrator. To it connected are digital connection modules 3, each as an interface for a PCM connection cable or a remote multiplexers are used, which summarizes subscriber lines. Each connection module 3 has

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carries information at 2048 Mb / s and works with a Connection line control unit 4 together, from one ModuL control unit 5 is controlled.

Tei subscriber line units 6 are also connected to the PCM coupling network 2, each of which has up to 15 di summarize digital participants. The connected Participants each transmit information at 80 kb / s. Each subscriber line unit 6 is connected to a connection line control unit 7 via which the information to the PCM coupling network 2. The connection line control units 7, like the PCM coupling network 2, are controlled by the module control unit 5. The module control unit 5 also exchanges messages further connection modules 8 and 9, about the information at 2048 Mb / s to the central part of a local exchange, which is a main switching network 10 (DSSS).

The switching network 10 is controlled by a processing unit 11 (processing unit, PU) controlled. The processing a 11 is with the switching network 10 via a message transmission unit 12 connected. The processing unit 11 also controls a subsystem 13, whose task is the routing of the traffic of the data packet streams. That Subsystem 13 contains circuits (hardware), which by fixed programs (firmware) are controlled; It is with of the packet module control unit 1 is connected in the manner shown.

In this way, assemblies 3, 6, 2, 8, 9 and

10 the usual "telephone" level, the modules 4, 7, 5, 11 and 12 form a control level and the assemblies 1

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and 13 form a package level. It is pointed out that at the packet level the transmission takes place at 2048 Mb / s, but that it is not a time-multiplexing process acts / because each data packet contains information about S contains the route of the parcel. It is further pointed out that that the control level exerts influence on the other two levels, with assemblies such as the connection line processing control unit 4 act as an interface. the in the drawing on the left side of the package module control unit 1 and the module control unit 5 as narrow The assemblies shown in rectangles are the input stages of these control units. The module control unit 5 also has, as indicated. Access to a broadband network and the subsystem 13 has access to (not shown) Participants of the packet network.

As can be seen from the drawing, each connection line control unit can send 4 or 7 messages to the packet module control unit 1 via their input stages or received from it. As a result, data packets arriving at a line control unit 4 or 7 are transmitted to the packet module control unit 1, if whose address field shows that they are via the packet module control unit 1 must be conveyed. Hence, each port line control unit 4 and 7 requires at least two Part of the connector parts, one for the module control unit 5 and one for the package module control unit 1. The Package module control unit 1 also has at each stage a part of the interface through which the module control unit 5 the connection to an ISDN (Integrated Services Digital Network) control is established can be. All data packets are switched in the packet level 1-13, so that the packet module control unit 1

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The only purpose is to enable data packets to be exchanged between the line control units 4 and 7 and the package level.

A large part of the program (software) for control the route structure for the packet transmission and its triggering is contained in the processing unit 11. These works with peripheral 'microprocessors at the packet level via an output unit of the processing unit 11 together. The processing unit 11 contains the program for the transport of data packets on the packet level, as it is during the connection establishment through the Control level program for routing the data packets is conveyed.

Since normal telephone numbering in a fully integrated ISDN is used, the program has to do the packet switching in the processing unit 11 access to allocation tables between the subscriber number and the device number. One local switch has a local facility for routing data packets.

The network node shown in the drawing contains both a language level such as a data packet level. In many cases this is the capacity required for packet switching less than that for language teaching. In such a In this case, some of the network nodes, especially those that are local exchanges, do not have a packet layer. Even some of the intermediate network nodes will not Facility for - having packet switching. If only one there is little need for packet switching this can be unwound in a small number of designated ways. This situation will of course change when the proportion of non-telephone services increases.

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In the case of a skills placement system with several Levels and a multitude of rental nodes each level will enforce several switching nodes. It can be sensible, not just in terms of the transmission serving levels ("telephone" and data packets) to connect lying headers with each other through transmission paths, but also those in the control level Lying control and processing units by soLche To connect paths that are independent of those for the transmission of messages paths are used. These paths are then used for signaling between the switching nodes.

One of the possible uses for a multilevel network is to build a virtual path through one of the levels. So can through while the connection is being established the first header a virtual path between the participants involved in the connection through one of the additional header fields can be set up and used for continuous signaling. Such a virtual one The route can be cleared again after the connection has been successfully established will. Such a virtual path is built up parallel to the through path. Such a connection with a continuous virtual path gives the connected Stations, for example the interconnected ones Participants, the possibility of a continuous Signalization. The tax level is done this way Protected against excessive use, which in some cases could occur when the whole Continuous signaling via the control level is successful would have to.

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Claims (6)

International Standard Electric
Corporation, New York F.H. Rees 28 Claims (T) Automated na ural skills placement system that has a number of interconnection networks corresponding to a multi-level architecture are functionally structured, with a first digital switching network through which Connections between telephone subscribers or through connections be set up between data terminals and with a control network that has access to the first switching matrix, ■ to control the establishment of a connection through this switching matrix characterized in thatat least Another digital switching matrix is available, via which connections for a different type of traffic are set up can be used, for example for a broadband data service, that the control network also has access to the other switching matrices in order to also establish the connection in to control these switching matrices so that the same control network controls the connection setup in all switching matrices causes and that at least for some of the connected participants a certain connection is optional is possible via one of several of the switching matrices mentioned, provided that this is done by those involved in the connection Participants is desired. ZT / P1-BS / BI, 11/29/1983 -Ζ- ' BATH ORIGINAL F.H. Rees 28 2. Message switching system according to claim 1, characterized in / that the first digital switching network a number of switching nodes of the system interconnect that the control network at least at some these switching nodes processing units includes that at least one of the further switching matrices at least some of the switching nodes of the system connects with each other and that the access of the control network to the further switching matrices takes place in each switching node that is connected to the further switching matrices that is. 3. Message switching system according to claim 1 or 2, characterized in that the messages are transmitted in time division multiplex PCM in one level and that in at least one of the other levels of news digital, but not in time division multiplex, but rather, for example, in packets. 4. Message switching system according to one of claims 1 to 3, characterized in that the parts located in different switching nodes of the control network connected to one another by such paths are those used by those used for messaging Because are independent and that these paths are used for signaling between the switching nodes. 5. Message switching system according to one of claims 1 to 4, characterized in that during the Connection setup through the first switching matrix a virtual path between those involved in the connection Subscribers through one of the other coupling fields - *? _ ■ H.F. Rees 28 is built and that this virtual path is used for end-to-end signaling. 6. Message switching system according to claim 5, characterized in that the virtual path is only during the connection is established.