RU2066927C1 - Device for connection of two subscribers to one subscriber's line - Google Patents

Abstract

FIELD: communication equipment; can be used in automatic telephone sets. SUBSTANCE: device comprises analyzers 1, 2 of the condition of line of the first and second subscribers, control unit 3, interlocks 4 and 5 of the first and second subscribers, magneto ringing receiver 6, test unit 7, load simulator 8, subscriber's number receiver 9 and subscribers call unit 10. EFFECT: reduced time of connection of subscribers to subscriber's line. 1 dwg

Description

 The invention relates to communication technology and can be used in automatic telephone networks.

 A device is known for connecting one of several subscriber units to a single subscriber line (see application FRG 2251827, class N 04 M 9/00). The specified device does not select incoming calls to subscribers.

 The closest in technical essence to the claimed device is a device for connecting telephone subscribers to one subscriber line, carrying out their full switching (see invention by AS 1354440, class N 04 M 9/00). This device comprises a first subscriber line state analyzer, a second subscriber line state analyzer, a control unit, the first and second inputs of which are connected respectively to the first outputs of the first and second subscriber line state analyzers, a first subscriber blocking unit, a second subscriber blocking unit, an inductor call receiver, the first input of which is connected to the first input of the blocking block of the first subscriber and the first input of the blocking block of the second subscriber, the output of which is connected to the first input a of the analyzer of the second subscriber’s line status, the first input of the first subscriber’s line state analyzer is connected to the output of the first subscriber’s blocking unit, the second input of which is connected to the first output of the control unit, the second output of which is connected to the second input of the second subscriber’s blocking unit, and the output of the inductor call receiver is connected to third input of the control unit.

 The disadvantage of the prototype is the long procedure for calling the second subscriber, which consists in double-dialing the number of the subscriber line.

 The task is to reduce the time of connecting subscribers to the subscriber line.

 This task is achieved by the fact that a gating unit is included in the device, connected between the output of the inductor call receiver and the fourth input of the control unit, a load simulator, a subscriber number receiver, the output of which is connected to the fifth input of the control unit, the third output of which is connected to the second input of the inductor call receiver and the output of the latter is connected to the first input of the load simulator, the output of which is connected to the input of the receiver of the subscriber's number, and the subscriber’s call block, the first and second inputs of which are connected numbers to the fourth and fifth outputs of the control unit, the first and second outputs of the subscriber unit are connected respectively to the second inputs of the analyzers of the state of the lines of the first and second subscribers, the third output of the control unit is connected to the third input of the subscriber unit, the third output of which is connected to the second input of the load simulator and the first input of the inductor call receiver.

 The drawing shows an electrical block diagram of a device for connecting two telephone subscribers to one subscriber line.

 The device contains state analyzers of the lines of the first and second subscribers 1 and 2, a control unit 3, blocking blocks of the first and second subscribers 4 and 5, an inductor call receiver 6, a gating unit 7, a load simulator 8, a subscriber number receiver and a subscriber call unit 10. Block control 3 contains the element OR NOT 11, the first 12, the second 13 elements AND, the first 14, the second 15, the third 16 elements OR, the inverter 17 and the trigger 18.

 The device operates as follows. When the telephone is removed by the first subscriber, the direct current from the stationary battery is fed to the input of the analyzer 1 of the state of the line of the first subscriber, which leads to the appearance on its first output of a signal fed to the first input of control unit 3 and through the third element OR 16 passing to the second input of the unit blocking the second subscriber 5, which leads to disconnection of the line of the second subscriber from the subscriber line. At the end of the conversation by the first subscriber (the handset is placed on the lever switch), the aforementioned signal is removed and the device returns to its original state. Similarly, when the second subscriber picks up the handset, a signal is output to the second input of the control unit 3 and, through the second OR element 15, enters the second input of the block block of the first subscriber 4, which disconnects the line of the first subscriber from the subscriber line.

 When calling any of the subscribers, the number of the PBX subscriber line is first dialed, and the inductor call signal from the subscriber line is sent to the first input of the inductor call receiver 6. The emerging signal from its output passes to the first input of load simulator 8, the input of gating block 7 and to the third input control unit 3. In this case, the load simulator 8 includes in the subscriber line load, simulating a telephone, which leads to the termination of the inductor call signal and the establishment of a connection between the incoming subscriber load simulator 8. The gating unit generates a signal lasting 3-4 seconds, arriving at the fourth input of the control unit 6, and the signal from the third input through the OR elements 15 and 16 acts on the second inputs of the blocking blocks of the first 4 and second 5 subscribers and causes the lines to turn off these subscribers from the PBX subscriber line

 Further operation of the circuit will depend on the actions of the caller during the period of the signal duration of the gating block 7 in 3-4 seconds. If the caller, after dialing the number of the PBX subscriber line, is waiting, then at the end of the signal of the gating block 7, through the OR-NOT 11 element, permission is issued to the third input of the call block 10, from the first output of which the call signal through the state analyzer 1 enters the line of the first the subscriber, and from the third output of the block of the call of the subscribers 10 in the subscriber line of the PBX passes the signal control call.

 When the telephone is removed by the first subscriber and the DC component of the call current is exposed to the second input of the line subscriber’s line state analyzer, the signal from its first output confirms the blocking of the second subscriber’s line through the OR 16 element, and through the OR 14 element it goes to the second input of the inductor call receiver 6, which causes the disappearance of the signal at its output. The load simulator 8 is turned off, the signal from the first and third outputs of the call block 10 is terminated and a connection is established with the first subscriber, because the blocking signal at the second input of the blocking block of the first subscriber 4 disappears.

 If the handset of the first subscriber is not picked up, then after 25-30 seconds the signal at the output of the inductor call receiver 6 disappears and the device returns to its original state. To call the second subscriber, you need to dial an additional digit of sufficient significance, for example 3 or more, after dialing the number of the PBX subscriber line and during the action of the signal at the output of the gating block 7 (3-4 seconds). In this case, a series of pulses, propagating along the PBX subscriber line through a load simulator 8, is fed to the input of the receiver of subscriber number 9 and accumulating in it causes a short-term signal to appear at its output, which, through the AND-12 element, sets trigger 18 to the unit, the output signal which is fed to the second input of the call block 10.

 At the end of the operation of the gating signal through the OR-NOT 11 element, permission is issued for the third input of the call block 10 and the call signal from its second output through the analyzer block 2 passes to the second subscriber line, and the call control signal goes to the PBX subscriber line. When the second subscriber lifts the handset, processes similar to those described above for the first subscriber occur.

 The advantage of the invention in comparison with the prototype is to reduce the call time of the second subscriber by dialing an additional digit after the number of the PBX subscriber line.

Claims (1)

 A device for connecting two telephone subscribers to one subscriber line, comprising a first subscriber line state analyzer, a second subscriber line state analyzer, a control unit, the first and second inputs of which are connected respectively to the first outputs of the first and second subscriber line state analyzers, a block of the first subscriber, block blocking the second subscriber, an inductor call receiver, the first input of which is connected to the first input of blocking blocks of the first subscriber and to the first input of the block the second subscriber, the output of which is connected to the first input of the line state analyzer of the second subscriber, while the first input of the line state analyzer of the first subscriber is connected to the output of the block block of the first subscriber, the second input of which is connected to the first output of the control unit, the second output of which is connected to the second input block block of the second subscriber, and the output of the receiver of the inductor call is connected to the third input of the control unit, characterized in that the gate block included between the output ohm of the inductor call receiver and the fourth input of the control unit, a load simulator, a subscriber number receiver whose output is connected to the fifth input of the control unit, the third output of which is connected to the second input of the inductor call receiver, the output of which is connected to the first input of the load simulator, the output of which is connected to subscriber number receiver input, and a subscriber call block, the first and second inputs of which are connected to the fourth and fifth outputs of the control unit, and the first and second outputs of the subscriber call block are connected s respectively with the second inputs of the line state analyzers of the first and second subscribers, and the sixth output of the control unit is connected to the third input of the subscriber call block, the third output of which is connected to the second input of the load simulator and to the first input of the inductor call receiver, while the second outputs of the line state analyzers the first and second subscribers are respectively the first and second outputs of the device, the input of which is the input of the inductor call receiver.