EP0445251A1

EP0445251A1 - Digital telecommunications device

Info

Publication number: EP0445251A1
Application number: EP19900913808
Authority: EP
Inventors: Werner Friedrich Zucker
Original assignee: Stollmann Computer- und Kommunikations-Technik GmbH
Current assignee: Stollmann Computer- und Kommunikations-Technik GmbH
Priority date: 1989-09-23
Filing date: 1990-09-20
Publication date: 1991-09-11
Also published as: DE3931776C2; AU6403390A; WO1991004639A1; DE3931776A1

Abstract

Dispositif numérique de télécommunications dans lequel un nombre quelconque de modules de raccordement pour des utilisateurs ou des postes secondaires sont groupés autour d'un réseau couplé. Le réseau couplé forme un central avec des parties pilotes et avec un module pour la saisie des états internes appartenant aux fonctions de commande. Le module peut être appelé comme tous les autres utilisateurs.Digital telecommunications device in which any number of connection modules for users or secondary stations are grouped around a coupled network. The coupled network forms a central with pilot parts and with a module for entering internal states belonging to the control functions. The module can be called like any other user.

Description

Digital telecommunication device.

The invention relates to a digital telecommunications device in which any number of connection modules for subscribers or extensions is grouped around a digital switching network, which together with a plurality of control parts and in particular at least one module for the detection of A switching center forms part of the internal functions belonging to the operating functions and can be connected to other subscribers via a further switching network (e.g. the public network).

Known telecommunications systems (telecommunication systems) are switching systems (private branch exchanges or local exchange systems or long-distance switching systems) which establish (switch) connections (lines) between two terminals (subscribers) A and B.

This used to be done manually, in that the "Miss von Amt" established the physical line connection between A and B by plugging the lines on a switching matrix.

The "Miss vom Amt" was replaced by automatic dialing devices, the dialog with the dialing device being carried out using a dialing method (telephone disk). Terminal A transmits a phone number to the PBX and the PBX automatically switches the selected terminal B. Device B, however, only receives the connection request signals (the doorbell rings). The voice connection is only established when someone activates device B ("picks up").

Older switching systems established a physical connection via a rotary selector - which in principle simulated the "plugging process".

Modern - digital - switching systems no longer produce real electrical individual connections, but select digital (logical) channels from a supply of digital channels for connection. In a digital system, a special wire connection is no longer established between A and B, but only a logical connection (digital switching matrix).

The way in which A or B communicates with an exchange F is called the signaling protocol (previously this was a conversation with the "Miss von Amt"). In conventional - analog - technology, z. B. a multiple frequency dialing method or a pulse dialing method is used. The telephone number was the most important thing that was transmitted to the F.

A modern ISDN PBX mediates digitally and it supports digital - instead of analog - connections. After the connection between A and B has been established, a continuous (end-to-end) digital connection is established. The digital connection can be a "voice" or "data channel" - although this is transparent to the PBX, i. H . it cannot "notice" whether there is talk over this connection or whether data is being transmitted over it. However, it is sent by the post office via a so-called Service intervened because it has the monopoly over "real time" language switching. There are various signaling protocols, e.g. B. "1 TRβ", "Q931", "DKZE", etc. In Germany, the 1 TR6 on the main connection in traffic with a local exchange is the standard and the DKZE protocol (agreed by the ZVEI with the post office) on the private branch exchange.

The PBX extensions "sub-mediate" incoming calls, and all possible combinations occur, in particular a local exchange can again be a sub-exchange of a long-distance exchange.

The following facts are now important: No subscriber (A, B) has "insight" into the PABX. In particular, the exchange F does not inform any subscriber of the internal exchange status (e.g. who is on the phone with whom?). That seems to be a matter of course, because in conventional technology it was not (or almost not) possible because the end device was a telephone that could not do much with "data".

However, knowledge of the internal status is required:

for maintenance and diagnostics, for the switching center on the private branch exchange (which telephone is busy?) and for parameterizing the connection requests: which device can make long-distance calls, which device can go "outside" at all, etc.

In known telecommunications systems, special devices are connected via data lines (mostly so-called V-2 connections), specifically

the central operator or the Diagnostic place.

This connection technology is currently also used in modern ISDN systems.

The present invention is concerned with designing a device of the type mentioned at the outset in such a way that it is easier to handle and to maintain.

This is achieved by the features specified in the claim.

At the core of the invention is the fact that the module can be selected for recording the internal states belonging to the operating functions.

No additional device is required for maintenance and diagnostics, for switching and also for parameterizing the connection requests.These functions can be carried out from the outside with the help of a completely normal end device, through which the module mentioned above is selected.

The invention consistently makes use of the ISDN technology of the respective PBX, so that other types of connections (for example V 24 or connections deviating from the subscriber circuit) are no longer required.

The connection technology according to the present invention not only enables

- a central operator console, but several, integrated executive / secretary functions,

- any number of maintenance and diagnostic places, other status queries or parameterization places.

In particular, all seats can also be removed (remote), i.e. can be connected via other telecommunications systems (e.g. public exchanges) without special connection technology (modem) or the like. to use.

The connection is a "normal" ISDN connection without any change in the signaling protocol.

This connection technology has the following advantages over the conventional one: It can also be used to maintain, diagnose and parameterize smaller PBXs "remotely".

According to the OSI 7-tier model, a switch consists of the protocols for the participants and the switch.

The B channel is the voice / or data channel (the "line"). The D channel is the switching channel with the corresponding switching protocol (signaling protocol or D channel protocol).

A signaling channel can (need not) switch more than one B channel (for the standard connection 2, more for multiplex connections, eg 30 for the primary multiplexer).

The protocol in the B channel is not standardized for data transmission, with speech it is "the language", i.e. protocol levels 2 to 6 are empty, layer 7 is the PCM (pulse code modulation) of the language.

The B channel is conveyed transparently, ie what is transmitted and how is an end-to-end protocol agreement (with the service features language and data). A wide variety of agreements are possible for the data, e.g. B .:

Asynchronous protocols (V.24) with rate adaptation HDLC (Layer 2), T70, T90 X.25 (Layer 2-3) SDLC

The present invention is based on a protocol between subscribers (A or B) with the switching system

(F) is introduced in the B channel, with which the operator station tasks (see above) can be fulfilled. The invention comprises the layer 1 communication protocol

(physical layer according to OSI definition):

- Layer 1 is a physical ISDN connection that the switching system provides for digital ISDN terminals.

Example: S _σ , üpo / ZVEI, üκo and related ("private") connections.

So that this operating protocol is also compatible with the existing (partially standardized) D-channel protocols, a "virtual subscriber" is required. Virtual subscribers are intelligent units in the switching system, e.g. B. the diagnostic server, the status server, the parameterization server. The connection between the operator station (like a participant A) and the virtual participant within F (participant B _v ) is established in exactly the same way as the connection between A and B (via F). Only the subscriber B _{v is} not outside the switching system, but inside (eg on the "PCM-Highway" as a subscriber circuit. You can therefore select these operator functions with it - like normal B subscribers. That means the connection to The internal intelligence of the system is made exactly like the connection to an external one (e.g. a telephone or data terminal). The "virtual subscriber" is represented by an intelligence unit embedded in the system, which behaves like a data terminal. However, this has access to the TK internal resources and states so that all requested operating functions can be fulfilled.

A subscriber circuit (subscriber module, usually a component insert with about 4 or 8 terminal connections) for the mediation of end-to-end communication is replaced by a subscriber circuit which does not necessarily have external connections, but does so via a normal one Called number of selected B channels can be recognized as an "internal" terminal. The data exchange required to operate the PBX takes place between this internal data terminal (virtual subscriber) and the operator station (e.g. a PC).

The virtual subscriber (possibly in contrast to the normal subscriber circuits) has access to the resources necessary for the operation.

It is within the scope of the present invention for the communication between F (the virtual subscriber B _v ) and the operator station (A or B) for layer 2 the protocol

HDLC LAP-B (ISO)

to be used, namely between a real subscriber A or B (operator station) and the switching system F (virtual subscriber B _v ) • The only figure of the drawing shows a schematic representation of a device according to the invention.

The switching center shown in the figure contains a plurality of connection modules for the individual subscribers, but only two are shown in the drawing. These connection modules are connected to the internal switching network, which in turn can be connected to the public network or other switching centers.

The module for recording the internal states, which has already been mentioned several times, is also arranged within the switching center. Arrows indicate that the most diverse information can get into this module.

According to the invention, the module is now associated with a connection module which, like the other connection modules, can be connected to the switching network, as indicated by a dash.

It can be seen that one can reach the connection module from the outside, from the subscribers, or only from very specific subscribers, via the switching network in order to carry out desired functions.

Claims

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Claim

Digital telecommunication device in which any number of connection modules for subscribers or extensions is grouped around a digital switching network which, together with a plurality of control parts and in particular at least one module, forms a switching center for recording the internal states belonging to the operating functions, which can be connected to other subscribers via a further switching network (e.g. the public network), characterized in that the module for recording the internal states belonging to the operating functions with the aid of an assigned connection module in the manner customary for the other connection modules, can be dialed in particular via a separate phone number.