CN2124532U - Switchover caller for bridging telephone - Google Patents

Abstract

The utility model discloses a switchover caller of an extension telephone for the bridging telephone. The utility model is designed for realizing the functions of mutual independent, mutual no jamming, mutual call transfer, mutual talking, the indication of the off-hooking and line busy of the other telephone, etc. of the bridging telephones. The utility model is added on the bridging telephone and comprises an isolating circuit of talking, a polar changeover circuit of voltage, a discrimination circuit of the voltage, an electric switch circuit, an indicating circuit of the off-hooking, a call transfer circuit, a quadric circuit of music ringing, a calling button for the call transfer, and a talking button for mutual talking. The utility model is suitably used for a program control telephone network of the controlling mode of the calling resetting and has the advantages of simple structure and convenient use.

Description

Switchover caller for bridging telephone

The utility model relates to a kind of subscriber equipment of telephone communication, more precisely a kind of extension set of collinear bridging set conversion calling device.

The conversion calling set of existing a kind of collinear bridging set, connect by two collinear bridging sets, make have collinear, the first of jack per line, the second extension set all can be transmitted the recall bell signal mutually by the calling button of changing separately on the calling set, the calling party just can set up conversation with desirable callee (first or second), this conversion calling set makes two phones in parallel separate except possessing, do not disturb mutually, maintain secrecy mutually, outside the characteristics easy for installation, also have the characteristics that extension set in parallel is just being paid each other, but first and second phones in parallel can not be conversed mutually, do not have the indication that the line is busy of the other side's off-hook yet, use is made troubles.

The purpose of this utility model is the conversion calling set of a kind of collinear bridging set of design, be additional to by two telephone sets that are attempted by on the pair of telephone lines, or directly be produced in the telephone set, extension set each other, except that function with conversation isolations, calling diverting call, the indication of diverting call acousto-optic, also have the other side's extension set off-hook indicate and extension set two between the function of call conversation mutually.

Design principle of the present utility model is when conversion is called out, and telephone line voltage is remained on about 25V, adopts voltage identificating circuit, electronic switching circuit again, and the secondary call signal circuit reaches the purpose of diverting call.

This calling set is by two identical circuits, the capsule that element is assembled, there are two lead-ins to meet a pair of telephone exchange user line A respectively, B, two lead-out wire C are arranged, D connects telephone set separately, calling set is by the conversation buffer circuit, the polarity of voltage change-over circuit, voltage identificating circuit, electronic switching circuit, the off-hook indicating circuit, diverting call circuit and secondary music bell circuit are formed, the conversation buffer circuit is positioned between telephone exchange user line A and telephone line C, be used for when side's extension set off-hook isolating being connected of the opposing party's extension set and telephone exchange user line, the polarity of voltage change-over circuit is positioned between telephone exchange user line A and telephone line D, and telephone exchange user line B and telephone line D short circuit, be used for telephone exchange user line voltage is carried out polar switching, its output connects voltage identificating circuit, when the voltage of being differentiated is lower than certain value, electronic switching circuit is opened in control, the off-hook indicating circuit gets electric indication off-hook, and the line is busy, telephone line voltages is remained on about 25V after button is called out in operation with off-hook indicating circuit and the diverting call circuit that connects, drive the luminous and startup music bell drives loud speaker sounding of ringing pilot lamp, contain the conversation button in the conversation buffer circuit, be used for conversation mutually between two extension sets in parallel.

Describe technology of the present utility model in detail below in conjunction with the embodiment accompanying drawing:

Accompanying drawing 1 is the connection diagram of bridging set and party-line calling set.

Accompanying drawing 2 is a party-line calling set circuit structure schematic diagram.

Referring to accompanying drawing 1, first, the second of jack per line phone 100,200 in parallel respectively uses a party-line calling set 101,201 among the figure, each calling set has 4 lead end A, B, C, D, A, B fetch subscribers feeder a, the b from telephone exchange (program control), C, the D machine of answering the call uses if existing first, second phone is in parallel, then only needs calling set is inserted in the former phone circuit, backguy is in addition installed very easy.

Referring to accompanying drawing 2, the utility model will be guaranteed whose conversation earlier of whose first off-hook when being used to give orders or instructions or being talked about, and this moment, should there be the off-hook indication off-hook side, and promptly LED 1 is lighted, and the line is busy to express the other side.When being used for diverting call, then clicking earlier and call out button K1, this moment, ringing pilot lamp LED2 lighted, on-hook then, and two calling sets all send secondary music ringing tone, and the ringing pilot lamp LED2 of two calling sets all lights, until either party's off-hook call disestablishment state.When being used for two extension set both sides and conversing mutually, the first off-hook of a side clicks then and calls out on-hook behind the button K1, and the ringing pilot lamp LED2 of the other side's calling set lights, and secondary music ringing tone is arranged, and behind the other side's off-hook, our LED2 lights, off-hook at once, press-to-talk button K2 again, both sides can converse.

The following describes Fig. 2 circuit is how to finish above-mentioned functions.Frame of broken lines 1 is depicted as the conversation buffer circuit among the figure, frame of broken lines 2 is depicted as the polarity of voltage change-over circuit, frame of broken lines 3 is depicted as voltage identificating circuit, frame of broken lines 4 is depicted as electronic switching circuit, frame of broken lines 5 is depicted as the off-hook indicating circuit, frame of broken lines 6 is the diverting call circuit, and frame of broken lines 7 is a music bell circuit.

Diode D5～D8 is connected into bridge circuit, constitutes the polarity of voltage change-over circuit, and its input is connected across on A, the B line, its output connects voltage identificating circuit etc., and when hook state, 48V(is program control for A, B line voltage), triode T1 conducting, thereby the electronic switch of being made up of triode T2, T3 is off state.Have only the A of working as, B line voltage to be lower than 30V, the triode T1 that constitutes voltage identificating circuit ends, T2, T3 conducting, and electronic switch is closure state.

Diode D1～D4, voltage-stabiliser tube ZD1, controllable silicon SCR 1, capacitor C 1, resistance R 1, R2 constitutes the conversation buffer circuit, K2 is the conversation button, during hook state, do not constitute the loop between conversation buffer circuit and telephone exchange user line, have only when having a side to give orders or instructions earlier in the extension set in parallel or being talked about off-hook earlier, make conversation buffer circuit and telephone subscriber line constitute the loop by telephone set, the about 40V of voltage-stabiliser tube ZD1 both end voltage punctures conducting, thereby triggers controllable silicon SCR 1 conducting, at this moment, A, B line voltage descends, and suitably selects controllable silicon SCR 1, for example makes A, B line voltage drops to about 10V, at this moment, even another extension set in parallel is off-hook subsequently also, because of A, B line undertension is to puncture the controllable silicon SCR 1 in himself calling set, so the other side's phone and telephone line are isolated, realize that two phones in parallel are secret mutually, non-interfering function, off-hook side is not because of A, B line voltage descends, and triode T1 ends, T2, the T3 conducting, off-hook indication LED 1 is lighted, and tells not off-hook side the other side that the line is busy.

When being used for diverting call, press and call out button K1 elder generation off-hook side, short circuit voltage-stabiliser tube ZD2, trigger controllable silicon SCR 2 conductings, assignment lamp LED2 lights, indication is in call state, by triode T4, T5, resistance R 11～R13, capacitor C 3, C4, the constant-current source circuit that diode D9 forms provide for ringing pilot lamp LED2 and controllable silicon SCR 2 and keep electric current, after the on-hook of first off-hook side, because controllable silicon SCR 2 is in conducting state, so A, B line voltage remains on about 30V, makes the not voltage-stabiliser tube ZD2 puncture conducting of off-hook side, thereby triggers the not SCR2 conducting of off-hook side, A, the B line drop is to the 25V, start both sides' music bell IC circuit work, and drive both sides' loud speaker Y and send secondary music bell, until being called out the end off-hook, also can use original electronic bell circuit in the telephone set in the enforcement, with among the figure 10, the electronic bell circuit of 20 termination telephone sets gets final product.

The effect of shifting the capacitor C 2 in the call circuit 7 among the figure is when the off hook state of telephone line during by not diverting call changes to hook state, guarantee controllable silicon SCR 2 not conductings, the effect of C3 and D9 is when telephone line changes to off hook state by the diverting call state, guarantee that SCR2 reliably ends, the effect of C4 is to guarantee the reliable conducting of SCR2 when diverting call.

When being used for two extension sets in parallel and conversing mutually, the main first off-hook of end of calling out, by aforementioned analysis as can be known, called out end off-hook indication LED 1 this moment and light, the main end of calling out is pressed calling button K1, on-hook again, cause and called out end controllable silicon SCR 2 triggering and conducting, call out indication LED 2 and light, and, called out the end off-hook with secondary call signal, when main call out end see our off-hook indication LED 1 light after off-hook and press-to-talk button K2 again, trigger our controllable silicon SCR 1 conducting, our phone is also connected with telephone line, extension set two can be conversed.

Because the utility model is wanted first on-hook operation when diverting call, thereby be only applicable to use in the telephone network of calling party's release control, program controlled telephone switching network for example, if the switched telephone network of called release control or calling and called release control, can initiatively take out stitches because of Called Onhook, thereby can not use the utility model.

The utility model does not in use have impact to telephone switching system when static, have simple in structure, but many characteristics of function.

Claims (7)

1, a kind of conversion calling set of collinear bridging set, between a pair of telephone user line A, B and telephone line C, D, it is characterized in that: the conversation buffer circuit that is positioned between telephone exchange user line A and telephone line C, is used for isolating the opposing party's phone and telephone exchange user line when side's off-hook is conversed is arranged; Have and be positioned at the polarity of voltage change-over circuit that carries out polar switching between telephone exchange user line A and telephone line D, to telephone exchange user line voltage; Telephone exchange user line B and telephone line D short circuit; The voltage identificating circuit that is connected across polarity of voltage change-over circuit output, differentiates telephone exchange user line voltage is arranged; There is electronic switching circuit to accept voltage identificating circuit output, control polarity of voltage change-over circuit output voltage is added to two and the off-hook indicating circuit and the diverting call circuit that connect, in the described conversation buffer circuit conversation button is arranged, in the described diverting call circuit calling button is arranged.

2, the diverting call device of collinear bridging set according to claim 1 is characterized in that described diverting call circuit also includes the music bell circuit that is made of music integrated circuit and loud speaker.

3, the diverting call device of collinear bridging set according to claim 1, it is characterized in that described conversation buffer circuit is a diode bridge, between its output and be connected to controllable silicon SCR 1, its trigger electrode connects the diode bridge output plus terminal by the parallel circuits that resistance, voltage-stabiliser tube series circuit and resistance, conversation button series circuit constitute, between described controllable silicon SCR 1 trigger electrode and negative electrode and be connected to electric capacity.

4, the diverting call device of collinear bridging set according to claim 1 is characterized in that described polarity of voltage change-over circuit is a diode bridge.

5, the diverting call device of collinear bridging set according to claim 1 is characterized in that described voltage identificating circuit is that base stage has divider resistance, collector electrode that the transistor circuit of load resistance is arranged.

6, the diverting call device of collinear bridging set according to claim 1, it is characterized in that described electronic switch is made up of two triodes, the collector electrode of first triode connects the base stage of second triode and is just connecing described polarity of voltage change-over circuit output by resistance by resistance, and the e of second triode, the c utmost point are serially connected between described polarity of voltage change-over circuit output just.

7, the diverting call device of collinear bridging set according to claim 1, the controllable silicon SCR 2 that it is characterized in that described diverting call circuit be serially connected in the output of polarity of voltage change-over circuit negative between, the parallel circuits that resistance and electric capacity are arranged between its control utmost point and negative electrode, its control utmost point also connects the collector electrode of second triode of described electronic switch by resistance, voltage-stabiliser tube series circuit, described calling button is attempted by the voltage-stabiliser tube two ends, and second transistor collector of controllable silicon SCR 2 anodes and described electronic switch has constant-current source circuit indirectly.