CN2396579Y - Single-channel program-controlled telephone switching device - Google Patents

Abstract

The utility model relates to a single-passage program-controlled telephone switching device which comprises a machine box, a circuit board and an inner connecting wire, wherein, the circuit board is composed of a power supply circuit part, a control circuit part and a signal passage part. The control circuit part uses a single-chip computer as a center, is controlled by program, and plays the functions of identifying the state of a circuit and controlling process. A signal passage part is orderly provided with a lightning protection circuit, a connecting circuit, a circuit of a constant current source, an isolating circuit, an amplifying circuit, another amplifying circuit, another isolating circuit, another circuit of a constant current source, another connecting circuit and another lightning protection circuit from a local wire interface terminal to an army wire interface terminal. The utility model can conveniently realize single-passage program-controlled switching between different telephone networks.

Description

Single channel program controlled telephone switching device

The utility model relates to a kind of program controlled telephone switching device of program controlled telephone switching device, particularly a kind of single channel.

The domestic telephone network of China is made up of local net, army's net, the railway network etc., and the coverage of different telephone networks is different, and wherein the coverage rate maximum of local net uses most convenient.In the army little, far away, inclined to one side, the throwaway bit comparison is many, these units are general all in the coverage of place net, and wherein quite a few not in the scope of army net, there is bigger difficulty in telephone contact in they and the army between other unit, if the army's of use line couples together these units fully on the one hand, just need general's line to guide to these units, lay very expensive, safeguard the expense height, past contact meeting causes the repetition stringing of army from far-off regions line and local line, and these units can not utilize the directly army's of dialing line of on-site local line on the other hand.Also do not see the babyphone switching device that to realize intercommunication between local net and the army's net in the market.

The purpose of this utility model is to provide a kind of single channel program controlled telephone switching device, and it can utilize local line and army's line to realize intercommunication between local net and the army net easily.

The purpose of this utility model is achieved in that a kind of single channel program controlled telephone switching device; comprise cabinet; wiring board and interconnector; it is characterized in that wiring board is by the power circuit part; control circuit part and signal path part three parts are formed; control circuit partly comprises the monolithic computer circuit; send the telephone number initialization circuit; the audio frequency transmitter/receiver circuit; signal tone produces circuit; the signal tone identification circuit; system's automatic reset circuit; state control circuit; the ringing-current transtation mission circuit; the signal path part is followed successively by lightning protected circuit by local line interface end to army's line interface end; connecting circuit; constant-current source circuit; buffer circuit; amplifying circuit; amplifying circuit; buffer circuit; constant-current source circuit; connecting circuit; lightning protected circuit; signal path part switch on and off the realization that switches on and off by monolithic computer control two ends connecting circuit; when two ends have phone to dial in; signal is through lightning protected circuit; connecting circuit is delivered to monolithic computer and is detected; signal tone produces circuit by being connected between local line interface end buffer circuit and the amplifying circuit to local line mail call; the audio frequency transmitter/receiver circuit also is the transmission that realizes signal between local line interface end buffer circuit and the amplifying circuit with local line by being connected, and the signal tone identification circuit is by being connected the monitoring that realizes between the amplifying circuit signal condition on the signal path.

On the basis of technique scheme, the mains switch of complete machine, fuse holder, power interface, ground connection mouth, telephone line interface and the configuration switch of transmission telephone number and the configuration switch of state control circuit are arranged on the panel of cabinet.The configuration switch of state control circuit and the configuration switch of transmission telephone number are set on the panel of cabinet can make use of the present utility model simple more, convenient.

Just the utility model has the advantages that on the basis of existing local net and army's net communication timely fast between other unit in little, far away, inclined to one side, throwaway position in can the army of guarantee and the army, enlarged the coverage rate of army's net, be equivalent to general's net and expand whole local net to.Just because of this, avoided repetition stringing, can save a large amount of stringing materials and construction, maintenance cost at an area local net particularly from far-off regions and army's net.Monnolithic case of the present utility model is flat cuboid, and volume is little, cost is low, in light weight, and easy to use, and the place that is installed in local line and army's line gets final product.In addition, phone and stored-program control exchange are practical product, and the utility model is guarantee with these two kinds of mature technique exactly, adopt chip portfolios such as single-chip microcomputer, transceiver, signal identifier to form, be used for realizing being dynamically connected certainly between two telephone networks, technical scheme is simple and reliable.This technical scheme can not only reach the intercommunication of local net and army's net, can also confidentiality and the reliability that cryptographic means guarantees communication be set by employing.

The drawing explanation:

Fig. 1 is a circuit structure block diagram of the present utility model;

Fig. 2 is an overall structure schematic diagram of the present utility model.

Below in conjunction with drawings and Examples the utility model is described in further detail.

With reference to Fig. 2, the single channel telephone switching apparatus comprises cabinet 4, wiring board 7 and interconnector, the monnolithic case of this device is flat cuboid, wiring board 7 is installed in the cabinet 4, mains switch, telephone line interface, power interface, fuse holder, ground connection mouth are arranged on the rear board of cabinet, the configuration switch 6 that sends telephone number and the configuration switch 5 of state control circuit are arranged on the front panel of cabinet, and the switch on wiring board 7 and cabinet 4 panels, interface etc. link to each other with lead.6 one groups 4 totally 8 groups of telephone number configuration switchs, by these toggle switches can set by army's line dial when being local line to dial the place of call number that cries automatically.With reference to Fig. 1, power circuit part 1 can external 48V or 220V power supply on the wiring board, and the required 5V working power of conversion cost machine, and for control circuit part 2 and signal path part 3 provide power supply, it mainly is made of the 48D05 integrated circuit (IC) chip.Control circuit part 2 is the center with monolithic computer 21, by software program control, plays identification circuit state and process control effect, and monolithic computer 21 adopts the 89C51 chip.Send telephone number initialization circuit 22, can finish army's line dial when being local line to dial the setting task of the place of call number that cries automatically, it mainly is made of four 74LS245 integrated circuit (IC) chip.Audio frequency transmitter/receiver circuit 26 can send this machine preset phone number to local switch, and can receive the double-audio signal that the local switch of detection is sent here, and it mainly is made of the MT8880 integrated circuit (IC) chip.Signal tone produces circuit 25 can send signal tone to local exchanger user, finish different actions with the indication user, it mainly is made of 4060 integrated circuit (IC) chip and relay, produces signal tone with the mode of the orderly adhesive of monolithic computer 21 control relays.Signal tone identification circuit 27 is state such as the busy tone on the identification signal path, dialing tone, conversation correctly, and it mainly is made of the TC35307P integrated circuit (IC) chip.System's automatic reset circuit 23 when system crashes owing to external interference, can automatically reset, and system is never crashed, and it mainly is made of the DS1232 chip monitoring.State control circuit 24 can the initialization circuit operating state,---switching or automatically---automatically magnetite switching and whether allow to revise password etc. as automatically.Ringing-current transtation mission circuit 28 if army's network users use is magnetic telephone, can insert the army's of making network users ring with ringing-current or 2100HZ by this circuit.Signal path part 3 is followed successively by lightning protected circuit 31, connecting circuit 32, constant-current source circuit 33, buffer circuit 34, amplifying circuit 35, amplifying circuit 35, buffer circuit 34, constant-current source circuit 33, connecting circuit 32, lightning protected circuit 31 by local line interface end to army's line interface end.Lightning protected circuit 31 can prevent lightning impulse and damage telephone switching apparatus that it is made of the TR250-120 device that is serially connected in the signal path.Connecting circuit 32 plays control and whether connects signal path, promptly controls local network users or whether army's network users connects the other side, and it is realized with relay switch.Constant-current source circuit 33 effects are to send a constant current signal, make group side of crying enter next step action, and it mainly is made of the L3845B integrated circuit (IC) chip.Buffer circuit 34 adopts the 256b3 isolating transformers, and its effect is to guarantee the connection of both sides' signal and cut off carrier voltage.Amplifying circuit 35 can further amplify signal, and to guarantee call-information accurately and reliably, it mainly is made of the HF01 integrated circuit (IC) chip that plays two-way amplification.

In the course of the work; when local line has phone to squeeze into; signal is through the lightning protected circuit 31 of local line interface end; connecting circuit 32 passes to monolithic computer 21 1 high level; after monolithic computer 21 detects; with the relay adhesive in the local line interface end connecting circuit 32; send a constant current signal by L3845B chip in the local line interface end constant-current source circuit 33; make group side of crying enter next step action; monolithic computer 21 forms toot by the mode of the orderly adhesive of control signal sound generation circuit 25 repeat circuits with the signal that signal tone produces circuit 25 generations simultaneously--and toot sound is passed to and is dialled the side of crying; the side's of crying input password is dialled in prompting; monolithic computer 21 is waited for by audio frequency transmitter/receiver circuit 26 and is dialled the password that the side of crying dials in afterwards; if the password of dialling in is correct; the relay adhesive of monolithic computer 21 in will the army's of making line interface end connecting circuit 32; signal tone in army's line just can be by the lightning protected circuit 31 of army's line interface end at this moment; connecting circuit 32; constant-current source circuit 33; buffer circuit 34; amplifying circuit 35; pass through the amplifying circuit 35 of local line interface end again; buffer circuit 34; constant-current source circuit 33; connecting circuit 32; lightning protected circuit 31; pass to local line and dial in the person's of crying the ear, so that local line is dialled the phone that the person's of crying two-stage dialing is dialed army's line.Meanwhile, signal tone identification circuit 27 is the monitoring busy-back signals in real time, and as either party on-hook of both sides, circuit will revert to initial condition.

When army's line has phone to squeeze into; signal passes to monolithic computer 21 1 high level through lightning protected circuit 31, the connecting circuit 32 of army's line interface end; after monolithic computer 21 detects with the relay adhesive in the local line interface end connecting circuit 32; and the telephone number that the need that will collect push local line sends to local switch through audio frequency transmitter/receiver circuit 26; relay adhesive in general's line interface end connecting circuit 32 makes that the signal path part is unimpeded simultaneously.At this moment local user's information will be dialled in the person's of crying the ear by the army's of being delivered to line by signal path.Army's line is dialled the person of crying and can disposablely be connected efficiently and easily that army is little, far away, inclined to one side, the throwaway position like this, and crosses over the sensation of local net.Signal tone identification circuit 27 is the monitoring busy-back signals in real time, run into either party on-hook of both sides, and circuit will be resumed and be initial condition.

Claims (2)

1. single channel program controlled telephone switching device; comprise cabinet (4); wiring board (7) and interconnector; it is characterized in that wiring board (7) is by power circuit part (1); control circuit part (2) and signal path part (3) three parts are formed; control circuit part (2) comprises monolithic computer circuit (21); send telephone number initialization circuit (22); audio frequency transmitter/receiver circuit (26); signal tone produces circuit (25); signal tone identification circuit (27); system's automatic reset circuit (23); state control circuit (24); ringing-current transtation mission circuit (28); signal path part (3) is followed successively by lightning protected circuit (31) by local line interface end to army's line interface end; connecting circuit (32); constant-current source circuit (33); buffer circuit (34); amplifying circuit (35); amplifying circuit (35); buffer circuit (34); constant-current source circuit (33); connecting circuit (32); lightning protected circuit (31); signal path part (3) switch on and off the realization that switches on and off by monolithic computer (21) control two ends connecting circuits (32); when two ends have phone to dial in; signal is through lightning protected circuit (31); connecting circuit (32) is delivered to monolithic computer (21) and is detected; signal tone produces circuit (25) by being connected between local line interface end buffer circuit (34) and the amplifying circuit (35) to local line mail call; audio frequency transmitter/receiver circuit (26) also is the transmission that realizes signal between local line interface end buffer circuit (34) and the amplifying circuit (35) with local line by being connected, and signal tone identification circuit (27) is by being connected the monitoring that realizes between the amplifying circuit (35) signal condition on the signal path.

2. single channel program controlled telephone switching device according to claim 1 is characterized in that the panel of cabinet (4) is provided with the configuration switch (5) of state control circuit and the configuration switch (6) of transmission telephone number.

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