DE4409669C2 - Adapter for connecting at least one analog telephone device to a digital telephone network - Google Patents

Description

The invention relates to an adapter for connection min at least an analog telephone device to a digita les (ISDN) telephone network which in the preamble of claim 1 specified type.

Through the services-integrating, digital telecommunications network ISDN (Integrated Services Digital Network) are the  Users are offered a variety of new services. Through the Digitization of the telephone network makes it possible to digi tal signal connections from user to user with a Standard bit rate of (up to twice) 64 kbit / s for ver provision and additional mediation information mations via a control channel operated at 16 kbit / s (D₀ channel).

To also use conventional telephone sets with analog To be able to connect modules to the ISDN network appropriate adapters known, for example from DE 43 02 723 A1. These adapters carry the necessary channel selection and digital / analog conversion of the signals offered by the ISDN network.

Based on the shortcomings of the prior art the invention has for its object an improved To create ISDN adapters of the type mentioned at the outset, for efficient additional use of the over the ISDN network - For example also in the 16 kbit / s operated D₀ channel - to enable offered telecommunications services.

This task is carried out with the characteristic features of the Claim 1 solved.

The invention includes the knowledge that through Elimination of the data signals, in particular the D₀ channel, and transmission to a data connection, especially in the form of a serial Interface that possible there exists, this on a downstream data to further process the terminal. This enables the evaluation especially this digital data directly in corresponding  Data processing programs take place.

By combining the modules in an adapter housing results in a cost reduction, especially by reducing installation expenses a telephone system with additional data end direction. In this way, the over the S₀ channel transmitted information different inexpensive (or already existing) end devices feed.

According to the preferred embodiment of the invention is in the commonly used ISDN adapter Lich a device for variable distribution of the ISDN Line provided data channels provided. This one direction already enables at the exits of the ISDN Adapters an optional assignment of the ISDN system offered data channels for the respective intended Data terminal equipment or a telephone set. The be Special advantage is that parallel to a ge made additional telephone call, the content of the tele amounts of data relating to phonates on a different channel required, evaluated on a data terminal or for the call can be used.

According to another inexpensive further education of the Invention is the device for dividing the ISDN system provided data channels as distribution Matrix trained.  

The control unit permitted in conjunction with a functional memory cher and a processor an optional access to the data channels offered by the ISDN system and the appropriate selection of the desired data terminal tion, for example telephone sets, fax systems or screen devices, for use on these channels transferable data.

Other advantageous developments of the invention are in the subclaims or are identified below along with the description of the preferred embodiment the invention with reference to the figures. It demonstrate:

Fig. 1 is a schematic representation of the preferred embodiment of the invention,

Fig. 2 shows an advantageous embodiment of the adapter provided in Fig. 1 and

Fig. 3 shows a favorable development of the embodiment of the invention shown in Fig. 2 in a schematic representation.

In Fig. 1, an embodiment of an adapter 13 according to the Invention is shown as a block diagram, which is via a Western connector with an S₀-interface 12 is connected to an ISD network 2 . The adapter 13 has an internal assembly 1 , from which the telecommunications functions to be described below are carried out. Details of this circuit are described below. An analog telephone set 8 is connected to the output of the adapter by means of a TAE plug 11 . The voice information of one of the basic channels is supplied to this apparatus in an analog form. A data terminal 10 with a connected screen 9 is connected to the module 1 via a V.24 interface forming a data connection. The adapter is designed in such a way that in this unit there is both a digital / analog conversion of the transmitted data for handling the telephone voice communication and the division and adaptation of the other channels of the ISDN system to other data terminal equipment for the use of further telecommunications services.

Depending on the selected function of the adapter 1 (see FIGS. 2 and 3), this advantageously makes it possible to evaluate the data offered via the ISDN channels while simultaneously handling a telephone call, without a complete system for adaptation or preparation provided for ISDN of the information transmitted in the data channels must be present.

The illustration in Fig. 2 shows in greater detail the construction of the assembly 1, the direction in which a switching input 4 in the form of a decoder in the manner of a switching matrix for separation of control data of D₀ channel from the data of the base channels is provided. This unit, the signals supplied via the connected digital ISDN line, which are transmitted on data channels B₁, B₂ and D₀, are supplied together.

In addition to the well known selection of one of the Basic channels existing information and - according to appropriate digital-to-analog conversion - forwarding it to an analog terminal, for example in the form of a conventional speech apparatus, is replaced by a switch switch off the information contained in the D₀ channel separately and the connection for the data terminal fed. This information can be particularly in the call number or other identifier of the calling part subscriber or other mediation information such as the number of accrued Charge impulses or a time or phone number information mation. Digital information can also be found here Mailbox or other messages in coded form via be averaged. In the case of two connected analog If necessary, terminals can also use the information both D₀ channels are forwarded to these devices.

Furthermore there is also the possibility of the content one of the D₀ channels on the connection of the data terminal to switch, in which case the forwarding is the same in digital form or - if for reasons of use uniform modules in the D₀ channel already a digital Analog conversion in listening frequencies was made - after implemented again in a modem to be provided can.

The signal flow in the switch is controlled according to the external control signals. A control unit 6 is provided to control the device 4 . All the necessary functions of the device 4 for dividing the data channels are combined in a separate memory 7 and can be called up at any time in accordance with the desired telecommunications power to activate the device 4 . Due to the complex implementation processes in the assignment of the channels, where appropriate simultaneous digital / analog conversion of the data, the use of a processor 5 is provided for operating the ISDN adapter 1 , which is controlled by appropriate software for triggering timely switching processes.

The function memory 7 has an operating keyboard (not shown) or other actuating means, by means of which the desired mode of operation of the adapter can be optionally set. Depending on the selected function of the adapter 13 , an evaluation or other use of the data offered via the ISDN channels with simultaneous handling of a telephone call is possible without additional auxiliary devices, for example a modem, being used to adapt or prepare the data channels have to.

The schematic representation of FIG. 3 shows an advantageous possible embodiment of a means for dividing the information provided by an ISDN system data channels B₁, B _2, and D₀, while conforming to the corresponding data terminal equipment of the adapter according to the Invention (see position in Figure 3 . 1), the switch in the form of a two-line distributor matrix 4 with the matrix fields Ia, Ib,. . . until IId is implemented as an example. This matrix represents the different switching processes to be triggered by the microprocessor, in order to connect the sequentially nested signals of the S₀ channel to the outputs in good time.

In the present case, the matrix field Ic is switched through and connects the ISDN channel B₂ to the wires a / b of a telecommunication line, to which the telephone set (compare position 8 according to FIG. 1) is connected. At the same time, it would be possible to switch the matrix field IIa through a corresponding function and to establish a parallel fax connection via the data channel B 1. However, these "changes" take place sequentially at high clock speeds. A digital-to-analog converter can also be implemented in a controlled manner by the processor, in which case clock-wise - depending on the desired instantaneous amplitude of the analog signal - corresponding voltage dividers are activated. In this way, it is evident that analog and digital can be provided simultaneously on the output side with little effort, and thus conventional analog and digital terminals can be supplied with the required signal levels and forms in accordance with the standards.

The invention is not restricted in its implementation to the preferred embodiment given above game. Rather, a number of variants are conceivable which of the solution shown also in principle makes use of different types.

Claims (6)

1. Adapter for the connection of at least one analog telephone device to a digital (ISDN) telephone network (S₀ interface) with basic channels for the transmission of the useful information and an additional control channel, where the information of at least one basic channel via a digital-to-analog converter is a connection be supplied for an analog terminal, with a switch ( 4 ) for separating at least one information transmitted via the control channel from the information of the base channels and connecting means for switching a data output to the switch for the purpose of transmitting the data of the control channel to a downstream digital end, In particular a PC, characterized in that the connection means for switching on the data output are designed as a serial interface and a control unit ( 6 ) is provided for controlling the switch ( 4 ), which has an input for control data, which the selection of the base and d / or determine the control channel, the data of which are supplied to the data terminal, the control unit ( 6 ) being controllable from the downstream data terminal via the serial interface. 2. Adapter according to claim 1, characterized records that means for converting the number of the calling party or another conversation related information in a serial data tensignal, in particular according to V.24, are provided.   3. Adapter according to one of the preceding claims, characterized in that means ( 5 , 7 ) are provided which enable an optional transmission of the digital data of one of the basic channels or of data of the control channel to the data output. 4. Adapter according to one of the preceding claims, characterized in that the switch ( 4 ) is designed in the manner of a switching matrix, by means of which an assignment of the information transmitted on the channels offered by the ISDN system ( 2 ) to the connection for the analog Terminal ( 8 ) or the data connection for the data terminal device ( 9 , 10 ). 5. Adapter according to one of the preceding claims, there characterized by that the data of the base channel before transfer to the data output at Acceptance after analog-digital conversion using a modem be digitized again.   6. Adapter according to one of the preceding claims, characterized in that manual actuating means for controlling the control unit ( 6 ) are provided.