DE3315885A1 - Circuit arrangement for a connection device for connecting a plurality of telephone subscriber stations to a digital broadband switching system - Google Patents

Abstract

At the subscriber end of a broadband line, a connection device is provided which serves to connect digital as well as analog telephone subscriber stations. In this case, the analog telephone subscriber station can be operated in parallel with the digital telephone subscriber station. A line circuit and a multiplexer/demultiplexer, which is connected to it and has a plurality of inputs/outputs for speech and signalling channels, serves as an interface for connection of the digital subscriber connection line. A special connection circuit serves to connect an analog telephone subscriber station. With the aid of a changeover device, a line carrying speech signals can be connected alternatively to a multiplexer/demultiplexer or to the special connection circuit. The relevant signalling, however, is carried via the associated digital telephone subscriber station.

Description

Telefonbau und Normalzeit GmbH, Mainzer Landstrasse 128 -

6000 Frankfurt am Main 1

Circuit arrangement for a connection device for Connection of several telephone subscriber stations on a digital broadband switching system

The invention relates to a circuit arrangement for a connection device for connecting a plurality of telephone subscriber stations on a digital broadband switching system, wherein the connection device by one or more multiplexers / demultiplexers via a subscriber line-specific broadband line is connected to the switching system and the multiplexer / Demultiplexer the information transmitted on the individual transmission channels of the broadband line (voice, Radio, television, data, signaling, etc.) on 'individual lines or on these lines occurring information for transmission on the broadband line summarizes.

Kit help from so-called broadband services is given the possibility of subscriber connections via an individual subscriber connection To provide broadband lines with a variety of communication services. Below telephony, telex, data and text transmission, telecontrol, television and radio programs, video telephony, etc. The broadband line is either an Eoax cable or also a fiber optic provided. Access to the various types of networks is provided by the exchange by a subscriber line-specific device which combines the various types of messages and via the broadband line to another partially

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Subscriber connection-individual device transmits which is assigned to the subscriber terminals and the information arriving on the broadband line to the divides individual terminals of the subscriber, or summarizes the information arriving from them, which are then transmitted over the broadband line to the exchange, where again a breakdown is made the individual different communication networks takes place. More details about the individual subscriber connection Facilities and the broadband line itself, for example, can be found in the magazine PITCE (Federation of Higher Telecommunications Engineers of the European Community), Issue 1 (January February - March) 1982 on pages 37 to 42.

In Fig. 11 of this document, there is shown a block diagram with the individual subscriber connection facilities shown on both sides of the broadband line. Here is a special one for the transmission of television programs Transmission path provided. Multiplexers / demultiplexers are installed at both ends of the broadband line for each transmission path needed.

The above block diagram also shows a digital telephone set, which is followed by a further telephone set. It cannot be inferred from the cited document whether the second telephone set is also a digital or an analog telephone set.
The object of the invention is to provide a circuit arrangement for a connection device for connecting several telephone subscriber stations, the individual devices being designed in such a way that they can be used universally and also allow the connection of analog telephone subscriber stations.

This object is achieved in that the connection of a digital telephone subscriber station via a connecting line takes place on a line circuit, which the

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Generated feed current for the connecting line and with a multiplexer / demultiplexer is connected, which has three sin / outputs and information offered to them transmits successively on the connection line or information arriving on the connection line divided accordingly to the inputs / outputs, with the first and second input / output (P1, P2) voice and / or Data channels and can be connected to the third input / output of the corresponding signal channel or channels.

A further development of the invention is that a first voice channel at the first input / output of a first Multiplexer / demultiplexer and a second voice channel is connected to the first input / output of a second multiplexer / demultiplexer. In this way you can Connect two digital telephone subscriber stations to the connection device, with the multiplexer / The demultiplexer and the line circuits are identical are constructed.

A further development of the invention is that a special connection circuit for connecting an analog Telephone subscriber station is provided, which the incoming digital voice signals at the input / output in analog signals for transmission on the connecting cable or: converts the incoming speech signals into digital speech signals at the input / output and that the Input / output is connected to a voice channel. With. You cannot use this special connection circuit only analogue telephone subscriber stations, but also other analog ones. Facilities such as telephone call answering machines, paksimile devices, etc. on the broadband line operate.

In the journal telcom report, 5 (1982), issue 2, also a broadband network on pages 123 to 129 described, with a block diagram on page 128 in Figure 4 the individual subscriber connection facilities will be shown. In addition to a digital telephone subscriber station, further subscriber stations of the

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relevant subscriber line shown, however It remains to be seen whether these are also digital Telephone subscriber stations acts. More details about connection circuits can be found in your block diagram do not remove.

A further development of the invention also consists in that a Umsehalteinrichtung is provided which one Speech channel switches optionally to one of two inputs / outputs, that the first input / output with the first Input / output of a multiplexer and the second input / output is connected to the input / output of the particular connection circuit.

With the help of this switching device, it is possible to operate a digital or analog telephone station.

Further advantages result from the subclaims. 20th

The invention is explained in more detail using an exemplary embodiment which is shown in the drawing.

The broadband line DAL on which the information all communication services are transmitted is connected to a multiplexer M. This multiplexer provides the Subscriber-side interface of the subscriber line The multiplexer / demultiplexer M has a plurality of inputs / outputs, the outputs SP1 and SP2 respectively for the transmission of a telephone voice channel and the inputs / outputs SK1 and SK2 for the transmission of the signaling · information of the two voice channels are used. The Sin / Output X is for the information of the rest Communication services provided, especially for the transmission of radio and television information. The exit T supplies the corresponding clocks for the connection device AE, so that the outputs of the multiplexer / Demultiplexer M occurring information can be processed further in the correct phase or at the inputs of the multiplexer / demultiplexer M offered information

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can be taken over correctly by this.

It should also be pointed out that for each of the two directions of transmission there are corresponding inputs and outputs are provided on the multiplexer. There are also separate lines for each of the two transmission directions necessary, since these are to be treated in the same way with regard to the functions, these are only shown in the drawing each shown as a line.

To connect a digital telephone subscriber station DT via a subscriber line DL is used in the Connection device AE a line circuit LE. the Subscriber line DL is used for the simultaneous transmission of information in both directions, whereby these either via separate cores or also via a common core, for example using the separate layer method can be done. In the line circuit LE, the direction is divided into separate inputs / outputs. One Another task of the line circuit LE is to supply the subscriber line DL with power. In addition, the line circuit LE is with a corresponding Means for recognizing a call initiated by the digital telephone subscriber station DT are provided.

The line circuit LE is a multiplexer / demuliplexer (MUX) connected. Basically there is a multiplexer and a demultiplexer, which have separate Lines are connected to the line circuit LE in accordance with the direction of transmission. Both bodies have three inputs and outputs P1, P2 and S. As already mentioned, there is only one to simplify the illustration common multiplexer / demultiplexer MUX shown in drawing. The inputs / outputs P1 and P2 are used to connect the the lines transmitting voice information, while that line is connected to input / output S, which the associated signaling information transmits. The corresponding lines are, as described above, with corresponding inputs / outputs of the multiplexer /

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Demuliplexer M connected.

The transmission of the voice signals within the connection device AE takes the form of PCM words with a length of 8 bits with a transmission speed of 64 kbit / s, while the transmission of the signaling information is carried out at a speed of 16 kbit / s. The maximum transmission speed on the subscriber line. DL is 160 kbit / s (64 + 64 +16 + 16).

At the input / output S of the Muliplexers / Demuliplexers MUX can now be a line to be connected, via which either the signaling information for one or "^ also be transmitted for both voice channels. The decision ^η 5 decision is made as in the Muliplexer / demultiplexer M .

The voice information which is transmitted via the inputs / outputs SP1 and SP2 of the multiplexer / demuliplexer M, can be assigned to two separate phone numbers. If both pieces of information from a digital subscriber station DT1 supplied via the subscriber line DL, so can this is followed by a second digital subscriber station DT1, not shown, with both telephone subscriber stations Have access to both language information. However, it is also possible to connect to the connection device AE zxvei digital telephone subscriber stations DT1 and DT2 to be connected via separate subscriber lines DL. For this purpose, a further line circuit LE and a associated multiplexer / demuliplexer MUX is required. The connection is made in such a way that a multiplexer / Demultiplexer MUX connected to the multiplexer / demuliplexer M with one of the two lines carrying voice signals is, the input / output P1 of the respective multiplexer / demuliplexer MUX serves as the connection point, while the Lines for the associated signaling information with the input / output S of the respective multiplexer / demuliplexer MUX is connected. The inputs / outputs P2 of the multiplexer / demuliplexer remain unconnected in this case.

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In certain cases the requirement for 'connection an analog conventional telephone subscriber station exist. As an interface for connecting an analog Connection line AL is one in the connection device AE Connection circuit AN provided. This is not shown devices for feeding the subscriber line AL, for recognizing the end of the loop in the Telephone subscriber station AT, for generating Körtönen and Rufsignen and a device for receiving from

"• 0 of the telephone subscriber station AT transmitted dial code on. Furthermore, the connection circuit AN is provided with a device, not shown, for converting digital signals into analog signals and vice versa.

The function of the connection circuit AN is primarily to transmit the digital signals arriving at the input / output P3 To convert voice signals into analog voice signals and to send them out to the subscriber line AE or the analog voice signals arriving from there to convert it into digital voice signals and pass them on at input / output P3. The ones arriving at the input / output SA Signaling information is in appropriate line criteria on the subscriber line AL passed on accordingly (hoof stream, audible tones, etc.). Conversely, those on the subscriber line are grounded AL line criteria generated by the analog telephone subscriber station AT in corresponding signaling information is converted and passed on at the SA input / output. It is possible to use the input / output P3 of the connection circuit To connect AN directly to an input / output of the multiplexer / demuliplexer M, for example SP2. Likewise, the input / output SA of the connection circuit AN can be directly connected to one provided for the signaling information Input / output of the multiplexer / demuliplexer M are connected. However, should the analog telephone subscriber station AT are operated in parallel with a digital telephone subscriber station DT, so this is done a changeover device UM is required. The one in the The example shown in the drawing assumes

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that the analog telephone subscriber station AT operated in parallel with the digital telephone subscriber station DT2 shall be. However, it is also possible without further notice Such a parallel operation can be carried out in the presence of only one digital subscriber station DT. For this the individual devices must be wired accordingly.

Be the Umschalt.eeinrichtung UM, the switch shown as ^"1 is O, can be used as electrical or as an electronic switch formed. It is connected to a, voice, signals leading input / output of the multiplexer / demultiplexer M and outputs the incoming voice information either to a multiplexer / demultiplexer MIX ^ 5 or to the connection circuit AN "or feeds the speech information offered by the devices mentioned to the multiplexer / demultiplexer M. The switching device UM is controlled by the connection circuit AN.
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The puncture and the mode of action of the individual facilities the connection device AE will then be explained in more detail with the aid of a few examples of the connection setup.

1.) Incoming call to a digital subscriber st at ion DT.

As soon as the presence in the multiplexer / demultiplexer M a call is detected, are via the - Input / output STM signals corresponding to the 'control input · Direction ST sent, which causes the switching on of the supply in the relevant line circuit LE. After adjusting the synchronization between the connection device AE and the digital telephone subscriber station DT is the transmission of signaling information, which is in the digital Telephone subscriber station DT result in the acoustic and / or visual indication of the call. The notice of posting also reaches the multiplexer / demultiplexer M in the form of signaling information, which forwards this to the exchange. The above-

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the language information is conveyed in the already described way. The hanging message of the digital telephone subscriber station DT is also in the form of corresponding signaling information transmitted to the exchange. It also goes to sleep for the digital subscriber station DT recognized in the line circuit LE 'and to the control device ST transmitted, which causes the disconnection of the supply of the subscriber line DL.

2.) Incoming call for an analog subscriber station AT. ·

The processes are initially the same as already described. In the event that at both stations is to be called at the same time, the digital telephone subscriber station DT also receives the acoustic signal and visual display of the call, but not in the other case. In both cases, however, the digital one sends Telephone subscriber station DT from corresponding signaling information that is available at the input / output P2 of the multi " piexers / demultiplexers MUX occur and the input / output SA are fed to the connection circuit AN. The signaling information has in the connection circuit AN the transmission of call signals to the analog telephone subscriber station AT result. Will if the handset is lifted at the digital subscriber station T, a corresponding one arrives Signaling information to the connection circuit AN, which results in the disconnection of the ringing signals.

If the handset is picked up at the analog telephone subscriber station AT, this is done in the connection circuit AN recognized and also switched off the call signals. The detection of the unhooking message also has one Actuation of the Umsehalteinrichtung UM result in which now connects the input / output of the multiplexer M leading to the voice information with the connection circuit AN. The hanging of the handset on the analog telephone subscriber station AT has the switching back Switching device UM result.

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3 ·) · Outgoing call from a digital telephone subscriber station DT.

As soon as you pick up the handset on the digital Telephone subscriber station DT is recognized, this is indicated by a corresponding criterion on the subscriber line DL communicated to the line circuit LE, which then sends a corresponding signal to the control device ST sends. This informs the multiplexer / demultiplexer M of the presence of an outgoing call with, whereupon the multiplexer / demultiplexer takes appropriate measures to initiate a connection setup. After switching on the supply on the digital subscriber line, the synchronization takes place the transmission path and the transmission of the signaling information as part of the connection setup. After the requested participant has reported, the voice information is transmitted. the The procedures for hanging up the handset have already been described.

4.) Outgoing connection from an analog telephone subscriber station AT.

The hanging of the handset on the analog telephone subscriber station AT is recognized in the connection circuit AN and communicated to the control device ST. This sends a corresponding message to the relevant line circuit LE to switch on the Supply and to the multiplexer / demultiplexer M to initiate the connection setup. In addition, the Changeover device UM operated. The one from the connection circuit Signaling information sent to AN to identify the unhooked status, use the Input / output P2 of the multiplexer / demultiplexer MUX of the digital telephone subscriber station DT transmitted, whereupon in this the off-hook state of the analog telephone subscriber station AT correspondingly optically is marked. The ones from the multiplexer / demultiplexer M incoming signaling information is in the digital telephone subscriber station DT on the second Voice channel implemented and used by the multiplexer / demultiplexer

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MUX via the input / output P2 of the connection circuit AF fed. The analog telephone subscriber station AT then receives the audible tone. The one from the analog Telephony subscriber station AT transmitted Vahlkennzeichen are received by the connection circuit AH " and converted into corresponding signaling information, which is transmitted via the second voice channel (P2) the digital telephone subscriber station DT supplied which these to the corresponding signaling channel implements. These go from the multiplexer / demultiplexer MUX (input / output S) to the multiplexer / demultiplexer M, which dlie forwarding to the exchange caused. The voice signals arrive via the switch device UM to the termination circuit AN ,, where these are converted into analog values and fed to the analog telephone subscriber station AT. the from the analog telephone subscriber station AT transmitted analog voice signals are in the connection circuit AN converted accordingly and fed to the multiplexer / demultiplexer M via the opposite route. The processes involved in the mounting notification have already been described.

With the connection circuit AF it is not only possible to connect an analog telephone subscriber station, rather analog telephone answering machines, Facsimile machines, etc., basically all facilities that are connected under an analog Subscriber connection can be operated.

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Claims (7)

Telefonbau und Normalzeit GmbH, Mainzer Landstrasse 128 - 146 6000 Frankfurt am Main 1 Circuit arrangement for a connection device for connecting several Pernspre'ch subscriber stations to a digital broadband switching system Claims 1 / Circuit arrangement for a connection device for connection of several Pernsprechunterstation to ■ a digital broadband switching system, wherein the connection device is connected to the switching system by one or more multiplexers / demultiplexers via a subscriber connection-individual broadband line and the multiplexer / demultiplexer is connected to the divides information transmitted to individual transmission channels of the broadband line (voice, radio, television, data, signaling, etc.) onto individual lines or summarizes the information occurring on these lines for transmission to the broadband line,
characterized, that the connection of a digital telephone subscriber station (DT) via a connection line (DL) to a Line circuit (LE) takes place, which generates the feed current for the connection line (DL) and with a Multiplexer / demultiplexer (MUX) is connected, which has three inputs / outputs (P1, P2, S) and which are connected to these The information offered is transmitted one after the other to the connection line (DL) or the information on the connection line (DL) incoming information accordingly - OQPY ' on the inputs / outputs (P1, P2, S), with the first and second input / output (P1, P2) voice and / or Data channels (SPI, SP2) and at the third input / output (S) the corresponding signal channel (s) (SK1, SK2) are connectable. 2. Circuit arrangement according to claim 1, characterized in that that a first voice channel is connected to the first input / output (PI) of a first multiplexer / demultiplexer (MUX1) and a second voice channel to the first ¹ input / output (P1) of a second multiplexer / demultiplexer (MUX2). 3. Circuit arrangement according to one of claims 1 or 2, characterized in that that a special connection circuit (AIT) is provided for the connection of an analog telephone subscriber station (AT) is which converts the incoming digital voice signals to the input / output (P3) into analog signals for transmission on the connecting line (AL) or the speech signals arriving on this into digital speech signals at the input / output (P3) and that the input / output (P3) is connected to a voice channel (SP). 4. Circuit arrangement according to claim 3 » characterized, that the special connection circuit (AH) has a further input / output (SA), the there incoming signaling information of the relevant voice channel (SP) into a corresponding ^ for analog Subscriber stations (AT) suitable signaling or this in signaling information at the input / output (SA) is implemented. 5. Circuit arrangement according to one of claims 1 to 4, characterized in that that a Umsehalteinrichtung (UM) is provided which switches a voice channel (SP) optionally to one of two inputs / outputs (P4, P5) so that the first input / Output (Ρ4) with the first input / output (P1) of a multiplexer / demultiplexer (MUX) "and the second input / output Output (P5) with the input / output (P3) of the special Connection circuit (AN) is connected. 6. Circuit arrangement according to one of claims 1 to 5, characterized, .that the further input / output (SA) of the special connection circuit (AN) is connected to the second input / output (P2) of the relevant multiplexer (MUX). 7. Circuit arrangement according to one of claims 3 to 6, characterized, that the special connection circuit (AN) upon detection of the loop closure of the connection line (AL) the Umsehalteinrichtung (UM) operated in such a way that the voice channel separated from the multiplexer (MUX) and connected to the special connection circuit (AN). P 3810
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