DE3033337A1 - SUBSCRIBE CIRCUIT FOR ELECTRONIC AUTOMATIC HOME PHONE CONTROL PANELS - Google Patents

Description

HOFFMANN · EITLE & PARTNER 3 Q 3 3 3 3

PATENT LAWYERS

DR. ING. E. HOFFMANN (1930-1976) DIPL.-ING. W.EITIE DR. RER. NAT. K. H OFFMANN. Dl PL.-ING. W. LEHN

DIPL.-ING. K. FOCHSLE DR. RER. NAT. B. HANSEN ARABELLASTRASSE 4 (STERN HAUS) D-8000 MD NCH EN 81 TELEPHONE (009) 911087. TELEX 05-29il »(PATH E)

44 961

ISKRA 5OZD elektrokovinske industrije n. Sol. Ο., j Ljubljana / Yugoslavia

Subscriber circuit for electronic automatic in-house telephone exchanges

The invention relates to a subscriber circuit, which is the most common element in any electronic auto attendant.

Previously known solutions for subscriber circuits were implemented using relay technology. With the development of new revolutionary electronic components (microprocessors, LSI circuits, computers, electronic matrices, etc.) new development opportunities appeared. However, because of the 5V logic, it was not possible to use certain circuits to be realized according to known principles. Therefore new solutions had to be found.

The object of the invention is to create such a subscriber circuit which is implemented using semiconductor technology and meets the following requirements:

- the supply of the subscriber's telephone with 60 mA direct current,

- the supply of the subscriber telephone / which is locally blocked, with 22 mA direct current,

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- D * "

- the detection of the lifting of the handset,

- the detection of the lifting of the handset during the call (as a B-subscriber),

- the determination of the impulse feed,

- the determination of the earth potential on one of the telephone lines,

- sending a call signal to the telephone,

- sending a 450 Hz tone to the telephone,

- the transmission of an 800 Hz tone (special tone) to the telephone.

This object is achieved with a circuit, the features of which are specified in claim 1.

Developments or useful embodiments of the Invention emerge from claims 2 to 10.

The circuit according to the invention is shown in the single figure shown in the drawing and is described below in the order of the required functions:

Supply of the telephone with 60 mA current.

The circuit is closed by the following components: Relay ground mr, a resistor R1, a diode 0C1 of an optocoupler, a first half of the primary winding of a supply transformer Tr ₇ a telephone line a, the telephone (when the receiver is lifted), a telephone line b, a contact a2 of a relay A, the second half of the primary winding, a contact al of the relay A, a resistor R2, a diode 0C2 of an optocoupler / a transistor T1 and -48 V supply. It must be emphasized that the transistor T1 must be in the conductive state (open), which is why a diode OC3 of an optocoupler must be controlled via a control input N / LB.

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The telephone is supplied with a current of 22 mA.

The circuit is exactly the same as the one from the previous case, only the transistor TT is closed (it flows no current through the diode OC3) and the current branch is closed by a diode D4 at the voltage -20 V. Diodes D2 and D6 protect the transistor T1 from negative voltage peaks.

Determination of the lifting and putting down of the receiver and the impulse feed.

All three possibilities represent a closure or an opening of the subscriber loop (power supply via the telephone) represents what a current hzw. represents the dataless state through the diodes 0C1 and OC2 of the optocoupler. Therefore, the sampling points which collectors of the transistors 0C1 'and 0C2' of the optocoupler are in the high state and in the impulse state (+ 5 V and O V).

Detection of the lifting of the receiver of the subscriber telephone during the call (as B-subscriber).

The lifting of the handset during the call is detected by a hardware circuit or a detector , which is formed by the following components: resistors R1 , R7 and R3, a capacitor C3, transistors T2, T3 and a diode 0C6 of an optocoupler. The principle is based on the decrease of part of the ringing voltage (frequency 25 Hz ₇ which superimposes the DC voltage supply of -4 8 V) at the resistor RI. When the receiver is on-hook, only alternating current flows during the call, which cannot open the Darlington pair of transistors T2 and T3. Therefore, the current flows through the diode 0C6 of the optocoupler, which enables the calling relay A to hold. The circuit only closes via relay ground, relay A _{f is} protected by diodes D5, OC7, OC6, and - 20 V. When you lift the receiver, direct current also flows to diode 0C6. This opto-element

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ment is no longer conductive and relay A fails. With its contact a2 interrupts the calling and extends the lines a and b to MX.

Determination of the earth potential

In this case, the direct current feed flows through only one of the lines a, b, which is why only one of the two sampling points is in the low state. This is used in the further information processing with a minicomputer via a Equivalence relay detected.

Sending a call signal

The circuit is closed by the following components: call 25 Hz, the contact a2, the line b, the telephone / the line a, one half of the primary winding of the supply transformer Tr, the diode OC1 (D1 in reverse Direction), the resistor R1 and relay ground mr.

The call is issued by the diode OC7 via the control input p, which opens a transistor OC7 ', is controlled. The second condition is an open transistor OC6 ', which is always the case when the receiver is on-hook.

Output of the 450 Hz and 800 Hz tones .

Both tones are emitted in the same way by Diodes 0C4 and 0C5 controlled via their transistors 0C4 ', 0C5' (the resistor R6 allows you a direct current through the secondary winding of the transformer). The induced voltage at inputs B1 or B2 causes the current in the telephone (handset).

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Claims (10)

- HOFFMANN · EITUS & PARTNER DR. ING. E. HOFFMANN (1930-1976) Dl TL-I NG. W. EITLE DR. RER. NAT. K. HOFFMANN DIPL.-ING. W. LEHN DIPL.-ING. K.FOCHSLE DR. RbR. NAI. B. HANSEN ARABELLASTRASSE 4 (STERNHAUS) - D-SOOO MO N C H EN BL TELEFON (089) 911087. TELEX 05-29619 {PATH E) 33 961 ISKRA-SOZD elektrokovinske industrije n. Sal. ο., Ljubljana / Yugoslavia Subscriber circuit for electronic automatic in-house ■ j switchboards Claims; 1 / subscriber circuit for electronic automatic House telephone exchanges made in semiconductor. · Technology, characterized in that it one circuit for the supply of the subscriber telephone with 60 mA direct current, one circuit for the supply of the subscriber telephone, which is locally blocked, with 22 mA direct current, a circuit for the determination of the lifting of the receiver of the subscriber telephone, a circuit for the detection of the lifting of the handset of the subscriber telephone during of the call as B-subscriber, a circuit for the determination of the impulse feed, a circuit for the Determination of the earth potential on one of the telephone lines, a circuit for the transmission of the ringing signal to the subscriber telephone, a circuit for delivering a 450 Hz tone to the subscriber telephone and a circuit for delivering an 800 Hz tone as a special tone to the subscriber telephone. 130013/1318 2. subscriber circuit for electronic automatic in-house telephone exchanges according to claim 1, characterized in that. that the circuit for supplying the subscriber telephone with 60 mA direct current is connected in series with a resistor (R1), a diode (0C1) of an optocoupler, the first half of the primary winding of the supply transformer (Tr), the telephone via two lines (a, b), one contact (a2) of a relay (A), the second half of the primary winding of the supply transformer (Tr), another contact (al) of the relay (A), a resistor (R2), another diode (0C2) one Contains optocoupler and the collector of a transistor (T1), the base of the transistor (T1 ^{) being fed via a transistor (0C3 1} ) of an optocoupler and resistor (R5). 3. Subscriber circuit for electronic automatic in-house telephone exchanges according to claim 1 and 2, characterized characterized in that the circuit for supplying the subscriber telephone / which is in local blocking The same components as the power supply circuit are connected in series with 22 mA direct current of the subscriber telephone with 60 mA, the circuit, however, via a further diode (D4) and not via the transistor (T1) closes, since its base is not fed. 4. Subscriber circuit for electronic automatic in-house telephone exchanges according to claims 1, 2 and 3, characterized in that the circuit for the detection of the lifting of the receiver of the subscriber telephone contains components connected in series which form the circuit for supplying the subscriber telephone with 60 mA direct current, and that the state from the diodes (0C1, 0C2) of the first optocouplers is transmitted to the transistors (0C1 ', 0C2') of these optocouplers and causes the collectors of the transistors (0C1 ', 0C2 ¹ ) of these optocouplers to be in a high pulse state +5 V loading ^find 130013/1318 5. subscriber circuit for electronic automatic in-house telephone exchanges according to claims 1 to 4, characterized / that the circuit for determining the lifting of the handset during the call as a B-subscriber is a series connection of resistors (R1 , R7, R3) and the base of a Darlington -Circuit of transistors (T2 / T3), the connection of the two collectors of the transistors (T2, T3) with a resistor (R4) and the diode (OC6) of an optocoupler contains / and 'that the diode (OC6) of this optocoupler contains the transistor (OC6 ') controls this optocoupler / which is connected in series with the transistor (OC7 ^J ) of another optocoupler and the relay (A). 6. Subscriber circuit for electronic automatic in-house telephone exchanges according to claims 1 to 5 _r characterized / that the circuit for the determination of the pulse feed contains the same circuit of the components as that for the determination of the lifting of the handset / with information about the pulse feed the state on the collectors of the transistors (OC1 ', OC2') of the first optocoupler, which can be / is used in high or low pulse state. 7. 'Subscriber circuit for electronic automatic House telephone exchanges according to Claims 1 to 6, characterized / that the circuit the same circuit as the circuit for determining the earth potential on one of the telephone lines for the 60 mA supply, with one of the collectors in the event of an earth fault on one of the lines of the transistors (0C1 ', OC2') of the first optocoupler in low pulse state O V is. 130013/1318 8. subscriber circuit for electronic automatic in-house telephone exchanges according to one of claims 1 to 7, characterized in that the circuit for sending a call signal to the subscriber telephone is a series connection of one contact (a2), of the telephone via the two lines (a, b), half of the primary winding of the supply transformer (Tr), the diode (OC1) of the first optocoupler with the anti-parallel diode (D1) and the first resistor (R1). 9. Subscriber circuit for electronic automatic in-house telephone exchanges according to one of claims 1 to 8, characterized in that the circuit for the transmission of the tone with a frequency of 450 Hz to the subscriber telephone contains a diode (0C4) of an optocoupler, which contains the information of a transistor ( 0C4 ¹ ) passes this optocoupler, which is connected in series with the secondary winding of the supply transformer (Tr) and a capacitor (C2), the collector of the transistor (0C4 ') of the optocoupler being fed via a resistor (R6). 10. Subscriber circuit for electronic automatic in-house telephone exchanges according to claims 1 to 9, characterized in that the circuit for the transmission of the tone with a frequency of 800 Hz to the subscriber telephone contains a diode (0C5) of a further optocoupler, which contains the information of a transistor ( 0C5 ¹ ) passes this optocoupler, which is connected in parallel to the transistor (0C4 ¹ ) of the optocoupler of the circuit for 450 Hz. 130 013/1318