SK369092A3 - Arrangement of telephonic calls in local contact - Google Patents

Abstract

For the optional connection of telephone terminals, particularly system telephones, to two-wire or four-wire subscriber line interfaces whilst in each case fully obtaining the implemented performance features, the terminal is provided with two modems. In four-wire operation, one modem is used for direct-current data transmission with low level and in two-wire operation one modem is used for data transmission with a carrier frequency above the voice band. Diodes and chokes with high dynamic impedance are used for coupling speech and signalling wires. In four-wire operation, the terminal is fed with power via the signalling wires and in two-wire operation is fed with power via the speech wires from the private branch exchange. <IMAGE>

Description

(57) Annotation:

In four-wire operation, a modem (GDN) is used to transmit data at a low DC level. In two-wire operation, a modem (DOV) for data transmission is deployed at one carrier frequency above the speech band. Diodes (DI) and dynamic high-power inductors (ED) are used to connect the voice conductors (A, B) and the brand conductors (C, D). In four-wire operation, the terminal apparatus is fed by branded conductors (C, D) in two-wire operation, then by voice conductors (A, B) from the telecommunications equipment.

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Arrangement of telephone terminals

Common area

The invention relates to an arrangement of telephone terminals for optional connection to a computer-controlled telecommunications device having a plurality of implementing power features, two wires. or four-wire subscriber line by shear adjustment for the content of any power features.

P <3 of the prior art

For comfort. computer-controlled telecommunications equipment are terminal telephones already known. they are connected by a four-wire setup, two connection wires serving for voice transmission and the other two connecting wires serving for power and signaling (DE-39 23 960 A1).

Such devices contain performance features such as necessity of different ways of dialing, official authorization, call signaling, call order, night connection, peace of mind, record keeping, wake-up call, faultlessness, redial, handset selection, crosstalk, loud traffic, free speech as well as the control of ancillary equipment such as door opening, remote operation and acoustic room monitoring,

Terminal telephones are connected in two terminals to conventional telecommunications equipment without known performance features. Changing the system towards comfort devices is always associated with the replacement of the previous two-wire installation with a new four-wire installation. This disadvantage is circumvented in the known telecommunication devices with a wireless setting. that their phone wired twice. The performance features are limited.

the shear system is delayed

Further connected is the development of the above mentioned equipment allowed? telecommunication system exclusively two wires. where power, speech transmission and signaling are secure? only through two conductors without limiting the performance characteristics: P b; k. 167. 0).

SUMMARY OF THE INVENTION The present invention is based on the object of solving a universal terminal telephone system or a telephone system which can be connected to a four-wire cut. In comparison with the previously mentioned device (DE-39 23 960 A1), as well as with the two wire cutter adjustable by the latter device (P 42 10 167. 0), it controls independently the ability of the cutter assembly and knows both using the performance characteristics of telecommunication equipment.

SUMMARY OF THE INVENTION

The object is solved by the invention, as indicated by the first claim, are the subject of the subclaims.

is in the Other beneficial edits feature

The configuration of telephony terminals for optional connection to a computer-controlled telecommunications device has a plurality of implementing power features, via a two-wire or four-wire subscriber line by shear adjusting with unlimited power feature content. According to the invention, the terminal device has four connection lines, one modem being connected between the speech conductors for data transmission of the traffic:

a low-DC data modem is connected with one carrier frequency above the speech band and between the branded conductors. An accumulator detector is connected to the voice conductor for separate assignment of connected local loops - shear adjustment. The voice and signal wires are coupled to each other via chokes. Signaling and tagging is controlled by: n from the wires above the speech band and in two-wire transmission with one carrier in four-wire modem data transmission:

low level of direct current.

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In the following, the invention will be explained in more detail on the basis of a block drawing, with no overvoltage protection and switching-over measures being shown.

DETAILED DESCRIPTION OF THE INVENTION

The telephone system of the aforementioned computer-controlled telecommunications equipment, which is four-wire connected, includes the following components: speech stage SS, voltage regulator SR, MC microcomputer with keyboard T and LC display, RS power resistors and one low data GDN modem level of direct current. It can be connected to such a terminal in two wires: SD storage detector. coupling capacitor CK. chokes ED and one DOV modem. The DOV modem allows power as well as simultaneous data and voice transmission over a two - wire line.

In a four-wire connection, the terminal is fed via the branded conductors C, D. The supply current flows through the RS-line resistors from the marking conductor C to the terminals of the terminal which are symbolized by the load resistor RL in parallel to the Shunt voltage regulator SR. voltage VC, and through the additional resistance of the power supply RS to the marker wire D.

The voice conductors A, B transmit signals without direct current to the transmitting and receiving device. Speech level SS includes a visual switch, a direction indicator, a microphone amplifier, a loose device.

headphone, speaker impedance of voice conductors A, E.

law o · v a c; at

The signaling data is transmitted via a GDN modem. for example, the button operation of the keyboard 7, or the display on the LC display. The voltage between and D is here modulated by correspondingly conductor C with logic signals on the line Txl m of the microcomputer MC to the GDN modem.

When the two-wire terminal is connected, the branded conductors C, D are not connected. Shunt - voltage regulator SR is just a switch made of diodes D.I and inductors ED connected to voice conductors A, B.

Chokes ED which may be in serve for symmetrical decoupling of direct current. The chokes ED are highly ohmic against the speech alternating current. so that the currents cannot act on the Shunt voltage regulator SR. In order to keep the speech stage SS without direct current, coupling capacitors CK are connected to the call conductors A, B.

The signaling data is transmitted, for example, at 32 kHz in two-wire operation using a DOV modem with one carrier frequency above the speech band. Correspondingly to the input Tx2 of the DOV modem, the amplitude is modulated to the voice conductors A, B.

the carrier signal

The bandpass filter in the modem transmits logical states of the signal share ran out of band. Also, by switching the carrier eliminated fault causes

DOV prevents both of them from matching their fault-noise-free low-pass speech signal

The low-band filter in the speech stage SS e I i m i me receiving disturbances by translating the speech signal by the carrier signal of the DOV modem.

separate link recognition>

In the market setting, the SD stack detector connected to the voice conductor is measured and the two-wire connection of the conductor A is measured. The potential of the speech microcomputer MC is processed. With a terminal, the potential is higher than with a four-wire connection. in the latter case, there is no direct voltage between the voice conductors A, B. The supply current looks for its way, depending on the shear setting, either through the power supply resistors RS or via the chokes ED. The diodes connected in the series prevent in the four-wire operation the operating voltage VC from penetrating through the chokes ED to the voice conductors A and B, which are free of direct current.

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Claims (4)

1. Arrangement of telephone terminal circuits for optional connection to a computer-controlled telecommunications regulation having a plurality of implicit power features, pricing of two- or four-wire subscriber shear lines with unlimited content of any power features. s u u u u u s s u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u d i clasp j · -. · C. D). where: • one modem (DOV) for m, not the end conductor (A, 3. 3) data transmission with one carrier frequency above the speech band is connected and a modem (GDN) for data transmission with low level of direct current is connected between the branded conductors (C, D), that a buffer detector (SD) is connected to speech wire (A) ) to separately identify connected lead lines - shear adjustments, The voice wires (A, B) and the tag wires (C, D) are coupled to each other via chokes (ED) and that signaling and tagging is controlled in dual-wired traffic via a single carrier data modem over the speech band and 4-wire modem (GDN) traffic for low-DC data transmission. Circuit arrangement according to claim 1, characterized in that, in four-wire operation, the terminal is fed via the marking wires (C, D) and the power resistors (RS). like Shunt - voltage regulator (SR) for production of constant operating voltage (VC). Circuit arrangement according to claim 1, characterized in that in two-wire operation the terminal is fed via speech conductors (A, B), the electronic chokes (ED) serving on one side for symmetrical coupling of the direct current supply and blocking on the other side AC current before Schunt voltage regulator (SR). 4. The choke (ES) arrangement is a direct current to the operating voltage of the circuits according to claims 1 and 2. characterized in that in series with electronic; arranged diodes (D1) for blocking, from pure, speech conductors (A. B) against u (VC) in four wires »; prevádzks.