CN2199648Y - Program-controlled telephone centralised arrangement - Google Patents

Abstract

The utility model relates to a miniature program-controlled telephone concentrator, which is divided into a remote terminal machine and a local terminal machine and uses an MT8870 chip as a main receiver, an MT5089 chip as a main signal device and a double tone multiple frequency communication module composed of transmitting and receiving signals share branch. The concentrator using the module has the advantages of stable and reliable product performance, ripe technology, convenient operation and maintenance, low cost, etc., particularly a pair of trunk lines does not need to be specially arranged as signaling link line, and the quality requirement of the trunk line is low, so the utility model is especially suitable for use in the telephone network of wide rural areas with less trunk lines and poor quality.

Description

Program-controlled telephone centralised arrangement

The utility model relates to a kind of communication apparatus, specifically is a kind of program controlled telephone concentrator.

The form of communication of the program controlled telephone concentrator in the modern telephone communication system is diversified, great majority adopt modulation (MODEM) mode at present, its advantage is that transmission rate is fast, the signaling kind is many, is applicable to relatively large concentrator, but its internal structure complexity, producing integration techno logy requires high, involve great expense, in use require to have the strength of safeguarding of strong technology, particularly it requires to have the measured transmission line of matter.And the vast rural area of China, telephone penetration rate is low, and transmission line is of poor quality, maintenance strength weakness, ability to shoulder economically is relatively poor, so generally adopt the concentrator with modulator-demodulator, more difficulty is arranged.

The purpose of this utility model provides and a kind ofly is suitable for that vast rural area uses, circuit is simple, technology maturation, stable and reliable for performance, cost is low, the small-sized program controlled telephone concentrator being convenient to keep in repair, and this kind concentrator is specially adapted to use on transmission line of low quality.

The utility model is to realize like this, the program controlled telephone concentrator is divided into remote termination and central office terminal's two parts, there are four trunk lines to link to each other mutually between the far-end trunk interface of remote termination and the local side trunk interface of central office terminal, the far-end trunk interface has four speech channels to communicate with the net that continues, the far-end trunk interface also with remote controller generation information exchange, the net that continues joins with 16 subscriber line circuits respectively, the net that continues is subjected to the control of remote controller, remote controller is controlled each subscriber line circuit, and has information to return.Each subscriber line circuit all has an ab port to be used to connect phone, and communication module has information exchange with remote controller, far-end trunk interface respectively.Central office terminal is similar to remote termination, if 16 subscriber line circuits are changed into 16 Fabric Interfaces, the far-end trunk interface changes the local side trunk interface into, and is just identical.Adopt the dual-tone multifrequency communication module on form of communication, it has and corresponding four the shared branch roads of transceiver of relaying, four two single multifrequency receiving branch circuits and the shared transmitting branch of dual-tone multifrequency.The change-over circuit that continues that shared route of each transceiver is connected with trunk interface is in series with the transmitting-receiving change-over circuit, and every receiving branch circuit is in series by double voice multi-frequency receiver and audio frequency coupling circuit.The control of the controlled device of double voice multi-frequency receiver, and produce information exchange with it.The touch-tone signal that receives is taken from the transceiver change-over circuit.Transmitting branch is made of the touch-tone signal device that is controlled by the controller and the coupling circuit of posting a letter, and touch-tone signal sends through the transceiver change-over circuit.

Accompanying drawing 1 is the structure chart of ET-SLC-16 type program controlled telephone concentrator remote termination (or central office terminal).

Accompanying drawing 2 is the circuit block diagram of ET-SLC-16 type program controlled telephone concentrator.

Wherein (A) is concentrator remote termination A, (B) is the B of concentrator central office terminal.

Accompanying drawing 3 is the communication module circuit diagram in the ET-SLC-16 type program controlled telephone concentrator.

According to accompanying drawing embodiment is done detailed explanation below.

The remote termination of ET-SLC-16 type program controlled telephone concentrator or central office terminal pack in the cabinet of cuboid.The structure chart of accompanying drawing 1 is a component placement schematic diagram of taking out a side plate, sees motherboard 11 from figure, rechargeable battery set 14, city's piezoelectric transformer 6, be installed in base plate 12 above.User's plate 3, control board 4, power panel 5 all by socket be plugged on motherboard 11 above.On company's edge of the motherboard 11 at machine rear portion, cable pigtail socket 10 is housed, there is panel 15 front portion of machine, that is close to mutually with it has a display circuit board 9, it is by inside cable 7, socket 13 is obtained signal contact with motherboard 11, there is side plate 2 two sides of machine, and there is backboard 1 back, also have cover plate 8 above.The net 21 that continues is housed on user's plate 3, and subscriber line circuit 16 perhaps is equipped with the net 24 that continues, Fabric Interface 25; Remote controller 18 is housed on the control board 4, communication module 19, far-end trunk interface 22, perhaps the local side controller 27, communication module 28, local side trunk interface 23; On the two block power supply plates 5 power supply module 20 or 29 are housed, its each parts in machine provides+two groups of power supplys of 5V+12V, it be by civil power through city's piezoelectric transformer 6 transformations after two groups of direct voltages of output after the rectification, filtering, isolation, voltage stabilizing.Operating key of this machine and indicator light all are installed on the display panel 9, and the hole that sees through panel 15 can and be observed for operation.Mains switch, parts such as fuse are installed on the backboard 1.

Fig. 2 block diagram has disclosed remote termination A and the B of central office terminal each other and the correlation between inner each assembly.

The course of work of ET-SLC-16 program controlled telephone concentrator is as follows:

1, the concentrator substation is done caller:

1. off-hook detection: behind certain substation 17 off-hook, be assumed to be receiver off-book No. 7, No. 7 subscriber line circuit 16 that then should correspondence delivered to off-hook information on the scan line of remote controller 18, remote controller 18 collect this information and through computing determine should (promptly No. 7) phone 17 off-hooks after, at first attitude is changed the user into " doing " from " spare time ", check then and have or not idle relay, if there is not idle relay, then by subscriber line circuit 16, send busy tone to this (promptly No. 7) phone 17, if idle relay is arranged, then select a relaying and the off-hook information of substation 17 is passed through communication module 19 by the mode of " polling successively ", far-end trunk interface 22 is sent to local side.

2. liaison: at first introduce the shared branch road 31 of transceiver here, the situation of shared transmitting branch 32 of dual-tone multifrequency and dual-tone multifrequency receiving branch circuit 30.Two ends of the shared branch road 31 of transceiver have two relays to control its conversion, one termination of relay J 1 coil+12V power supply, other end CJ1 receives on the output control line of remote controller 18, and the normally closed contact J1-1 of relay J 1, J1-2 receive 3,4 ends of audio frequency transformer T1 coil respectively.Normal opened contact J1-1, J1-2 receive 3,4 ends of transformer T5 coil in the transmitting branch 32 respectively, and the movable contact of J1-1 joins through the normally closed contact J5-1 of capacitor C 10 resistance R 21 with relay J 5.The movable contact of J1-2 joins with normally closed contact J5-2 through capacitor C 11 resistance R 22.The joining of C10 and R21 is also by piezo-resistance R13 ground connection.The joining of C11 and R22 is also by piezo-resistance R14 ground connection.One termination+the 12V of relay J 5 coils, other end CJ5 receives on the output control line of remote controller 18, movable contact J5-1, J5-2 receives the TRR1a of far-end trunk interface 22 respectively, on the TRR1b, the path that normal opened contact J5-1, J5-2 receive respectively in the far-end trunk interface 22 takies testing circuit 33.

1 pin of the MT5089 chip of the shared transmitting branch 32 of dual-tone multifrequency connects+the 5V power supply, and 6 pin ground connection meet crystal oscillator CR5 between 7 pin and 8 pin, 3,4,5 of chip, 9,11,12,13,14 pin are received the X1 of remote controller 18, X2 respectively, X3, X4, Y4, Y3, Y2, Y1,16 pin are output, receive coil 1 end of audio frequency transformer T5 through capacitor C 9, and 1 end are through the voltage-stabiliser tube ground connection of two butt joints, the 2 end ground connection of T5,3 of T5 terminates to relay J 1-1, J2-1, J3-1, on the normal opened contact of J4-1,4 of T5 terminates to relay J 1-2, J2-2, J3-2 is on the normal opened contact of J4-2.

18 pin of the MT8870 chip of dual-tone multifrequency receiving branch circuit 30 connect+the 5V power supply, 17 foot meridian capacitor C ₁Join with 18 pin, 16 pin pass through resistance R ₁Link to each other with 17 pin, be connected in series a crystal oscillator CR between 7 pin and 8 pin ₁5,6,9 pin ground connection of chip, 10 pin are received on the control line of remote controller 18,15 pin are received on the scan line of remote controller 18, receive 4 scanning element Q of remote controller 18 scan lines after 11 pin of 4 MT8870 chips, 12 pin, 13 pin, each corresponding pin of 14 pin are connected together mutually more respectively ₁, Q ₂, Q ₃, Q ₄On, 3 pin are through resistance R ₅Join with 2 pin, 2 pin pass through resistance R ₆Capacitor C ₅Receive audio frequency transformer T ₁1 end of coil, and through the voltage stabilizing didoe ground connection of 2 butt joints.T ₁Coil 2 end ground connection, T ₁3,4 ends of coil are received respectively in the shared branch road 31 of transceiver and are gone.Above-mentionedly introduced a branch road situation in shared branch road 31 of transceiver and the receiving branch circuit 30 and the situation of other 3 branch roads is identical, repeated no more here.

Remote controller 18 is at its control line x ₁, x ₂, x ₃, x ₄, y ₁, y ₂, y ₃, y ₄On send the code level signal that a representative should (No. 7) phone 17, the touch-tone signal device 32 of communication module 19 just goes out the double-audio signal that (No. 7) phone is somebody's turn to do in a representative from 16 human hair combing wastes of chip MT5089, this signal is by the shared branch road 31 of transceiver, far-end trunk interface 22 is delivered on the trunk line, through local side trunk interface 23, pass to the communication module 28 of the B of concentrator central office terminal, this double-audio signal is sent into the dual-tone multifrequency receiving branch circuit 30 of this relaying through the shared branch road 31 of transceiver in communication module 28, filtering through the MT8870 chip, decoding deposits this double-audio signal in corresponding to local side controller 27 Q with the form of tetrad sign indicating number ₁, Q ₂, Q ₃, Q ₄In four buffer latch of scan line, and present a high level, the 15th pin of MT8870 and the scan line S of local side controller 27 at the 15th pin of MT8870 chip ₂(or S ₄, or S ₆, or S ₈) link, after local side controller 27 collects this level, just known that concentrator remote termination A has user's receiver off-book and chosen this relaying, so local side controller 27 is put " doing " with the state of this relaying and from control line S ₁(or S ₃, or S ₅, or S ₇) send high level, the code of No. 7 user of representative during corresponding MT8870 chip just latchs buffering is presented on Q ₁, Q ₂, Q ₃, Q ₄On, the code name synthetic " exchange coordinate " that local side controller 27 adds this code this relaying use when continuing, and this User Status put " doing ".Dual Tone Multifrequency chip MT5089(posts a letter) and MT8870(collect mail) be the product of Canadian quick enlightening (MITEL) company, also can adopt 5089 and 8870 chips of other manufacturer production.

3. path continues: so far, the controller 18 and 27 of B of concentrator central office terminal and remote termination A has understood that all which user that need continue is, which number relaying what select is, this is embodied in " exchange coordinate " fully, the corresponding node (relay) of net is connected so they almost will continue simultaneously, the remote termination of concentrator, central office terminal all only takies testing circuit 33 with the path of this relaying respectively and is linked in this relaying loop, and other circuit is broken away from this loop, path takies the intervention attenuation very little (about 0.3dB) of testing circuit 33, so be a network that full impregnated is bright 17 from switch 26 to substation.Concentrator substation 17 has just been heard the dialing tone of being sent here by switch 26 at this moment, and the state of concentrator does not change in the process of subscriber dialing and conversation.

4. on-hook: if called subscriber's on-hook, then switch 26 send busy tone to the substation 17 of concentrator, but this caller loop from switch to concentrator substation 17 still keeps.After concentrated substation 17 on-hooks as caller, the path of B of central office terminal and remote termination A takies testing circuit 33 and detects less than loop current, so provide on-hook information to local side controller 27 and remote controller 19 respectively, the controller scan for inquiries disconnects the net 21 that continues after on-hook information, 24, the path of dismantling takies testing circuit 33, and this User Status and this relay state are shown " spare time ", and two terminals all revert to initial state.

2, the concentrator substation is done called:

Switch 26 is to certain substation 17 ring of concentrator, after this ringing signal is detected by the Fabric Interface 25 among the B of concentrator central office terminal, provide a bell signal level to a scan line of local side controller 27, local side controller 27 collects this signal level, confirm that through computing substation 17 is by ring, thereafter the flow process that workflow is done caller with top described concentrator phone is similar, also comprise liaison and the path part that continues, just touch-tone signal is to pass to far-end from local side, and treat that path connects, after ringing-current passes to substation 17, the controller of two terminals is inner opens a ringing-current timer, and judges in conjunction with the message level that path takies testing circuit 33 and provides whether path should discharge.After by the concentrator user off-hook of ring, the ringing-current timer is closed, and only the message level that is taken testing circuit 33 and provided by path judges whether path should discharge.In communication process, the state of concentrator does not change.Situation when the course of work of on-hook is done caller with above-mentioned concentrator user is identical.

Can see that from above-mentioned introduction the utility model advantage has: 1. this ET-SLC-16 type concentrator has adopted Dual Tone Multifrequency communication module, chip MT5089 and MT8870 design for phone and inter-exchange transmit subscriber signaling specially, the generation of its dual-tone multifrequency and reception technique maturation, circuit take chip as main body, circuit is simple, and maintenance is easy, and cost is low, and the performance of product is good, the reliability height is difficult for being disturbed, and network adaptability is strong. 2. this concentrator all is used as interconnection simultaneously to each bar trunk, does not make interconnection and do not need to take specially a pair of junction line, so this line efficiency is very high, for junction line originally with regard to few vast rural area particularly suitable. 3. the channel associated signalling of the utility model concentrator adopts " successively polling " mode, has avoided in the common signal channel mode on business fault of interconnected transmission line altogether (such as common broken string, short circuit, insulation bad etc.) and causes the defective of communication disruption. That is to say that certain bar trunk contact is not smooth, be unlikely having influence on other relaying, this can be satisfied with the very complicated rural telephone network of line status at the quality requirement that has objectively relaxed the center line circuit.

Claims (8)

1, a kind of remote termination of program controlled telephone concentrator, there are four trunk lines to link to each other between the local side trunk interface [23] of its far-end trunk interface [22] and central office terminal, far-end trunk interface [22] has four speech channels to communicate with the net that continues [21], information exchange also takes place with remote controller [18] in far-end trunk interface [22], the net [21] that continues joins with 16 subscriber line circuits [16] respectively, the net [21] that continues is subjected to the control of remote controller [18], remote controller [18] is controlled each subscriber line circuit [16], and there is information to return, each subscriber line circuit [16] all has an a, the b port is used to connect phone [17], communication module [19] respectively with remote controller [18], far-end trunk interface [22] has information exchange, it is characterized in that dual-tone multifrequency communication module [19] has and corresponding four the shared branch roads of transceiver of trunk line [31], four dual-tone multifrequency receiving branch circuits [30] and a shared transmitting branch of dual-tone multifrequency [32].

2, remote termination according to claim 1 is characterized in that dual-tone multifrequency receiving branch circuit ［ 30 ］ is to constitute with double voice multi-frequency receiver and audio frequency coupling circuit that 8870 chips are formed, and 18 pin of chip 8870 connect positive supply, and 17 pin connect through capacitor C ₁Join with 18 pin, 16 pin pass through resistance R ₁Link to each other with 17 pin, be connected in series a crystal oscillator CR between 7 pin and 8 pin ₁9 pin ground connection of chip, 10 pin are received on the control line of remote controller ［ 18 ］, 15 pin are received on the scan line of remote controller ［ 18 ］, receive 4 scanning element Q of remote controller ［ 18 ］ scan line after 11 pin of 4 8870 chips, 12 pin, 13 pin, each corresponding pin of 14 pin are connected together again respectively ₁, Q ₂, Q ₃, Q ₄On, 3 pin are through resistance R ₅Join with 2 pin, 2 pin are signal input part, and it and dual-tone multifrequency input coupling circuit join.

3, remote termination according to claim 1 is characterized in that two ends of the shared branch road of transceiver ［ 31 ］ have two relays to control its conversion, relay J ₁Coil one termination positive supply, other end CJ ₁Receive on the control point of remote controller ［ 18 ］ J ₁Two normally closed contact J of relay _1-1, J _1-2Join with the dual-tone multifrequency input coupling circuit, two normal opened contacts and shared transmitting branch ［ 32 ］ join J ₁Two movable contacts after resistance-capacitance coupling, meet J ₅Two normally closed contacts of relay, J ₅One termination positive supply of relay coil, other end CJ ₅Receive on the control point of remote controller ［ 18 ］ J ₅Two movable contacts receive the T of far-end trunk interface ［ 22 ］ respectively _RR1a, T _RR1bOn, J ₅Two normal opened contacts path of receiving far-end trunk interface ［ 22 ］ take on the testing circuit ［ 33 ］.

4, remote termination according to claim 1, it is characterized in that the shared transmitting branch of dual-tone multifrequency ［ 32 ］ is to constitute with touch-tone signal device and coupling circuit that 5089 chips are formed, 1 pin of 5089 chips connects positive supply, and 6 pin ground connection meet crystal oscillator CR between 7 pin and 8 pin ₅, 3,4,5,9,11,12,13,14 pin of chip meet the X on the output control line of remote controller ［ 18 ］ respectively ₁, X ₂, X ₃, X ₄, Y ₄, Y ₃, Y ₂, Y ₁End points, 16 pin are output, receive in the audio frequency coupling circuit and go, the output of shared transmitting branch ［ 32 ］ is connected with four shared branch roads of transceiver ［ 31 ］ simultaneously.

5, a kind of central office terminal of and the corresponding program controlled telephone concentrator of claim 1, there are four trunk lines to link to each other between the far-end trunk interface ［ 22 ］ of its local side trunk interface ［ 23 ］ and remote termination, local side trunk interface ［ 23 ］ has four speech channels to communicate with the net that continues ［ 24 ］, information exchange also takes place with local side controller ［ 27 ］ in local side trunk interface ［ 23 ］, the net ［ 24 ］ that continues joins with 16 Fabric Interfaces ［ 25 ］ respectively, the net ［ 24 ］ that continues is subjected to the control of local side controller ［ 27 ］, local side controller ［ 27 ］ is controlled each Fabric Interface ［ 25 ］, and there is information to return, each Fabric Interface ［ 25 ］ all joins with switch ［ 26 ］, communication module ［ 28 ］ respectively with local side controller ［ 27 ］, local side trunk interface ［ 23 ］ has information exchange, it is characterized in that dual-tone multifrequency communication module ［ 28 ］ has and corresponding four the shared branch roads of transceiver of trunk line ［ 31 ］, four dual-tone multifrequency receiving branch circuits ［ 30 ］ and a shared transmitting branch of dual-tone multifrequency ［ 32 ］.

6, central office terminal according to claim 5 is characterized in that dual-tone multifrequency receiving branch circuit ［ 30 ］ is to constitute with double voice multi-frequency receiver and audio frequency coupling circuit that 8870 chips are formed, and 18 pin of chip 8870 connect positive supply, and 17 pin connect through capacitor C ₁Join with 18 pin, 16 pin pass through resistance R ₁Link to each other with 17 pin, be connected in series a crystal oscillator CR between 7 pin and 8 pin ₁9 pin ground connection of chip, 10 pin are received on the control line of local side controller ［ 27 ］, 15 pin are received on the scan line of local side controller ［ 27 ］, receive 4 scanning element Q of local side controller ［ 27 ］ scan line after 11 pin of 4 8870 chips, 12 pin, 13 pin, each corresponding pin of 14 pin are connected together again respectively ₁, Q ₂, Q ₃, Q ₄On, 3 pin are through resistance R ₅Join with 2 pin, 2 pin are signal input part, and it and dual-tone multifrequency input coupling circuit join.

7, central office terminal according to claim 5 is characterized in that two ends of the shared branch road of transceiver ［ 31 ］ have two relays to control its conversion, relay J ₁Coil one termination positive supply, other end CJ ₁Receive on the control point of local side controller ［ 27 ］ J ₁Two normally closed contact J of relay _1-1, J _1-2Join with the dual-tone multifrequency input coupling circuit, two normal opened contacts and shared transmitting branch ［ 32 ］ join J ₁Two movable contacts after resistance-capacitance coupling, meet J ₅Two normally closed contacts of relay, J ₅The coil one termination positive supply of relay, other end CJ ₅Receive on the control point of local side controller ［ 18 ］ J ₅Two movable contacts receive the T of local side trunk interface ［ 23 ］ respectively _RR1a, T _RR1bOn, J ₅Two normal opened contacts path of receiving far-end trunk interface ［ 23 ］ take on the testing circuit ［ 33 ］.

8, central office terminal according to claim 5, it is characterized in that the shared transmitting branch of dual-tone multifrequency ［ 32 ］ is to constitute with touch-tone signal device and coupling circuit that 5089 chips are formed, 1 pin of 5089 chips connects positive supply, and 6 pin ground connection meet crystal oscillator CR between 7 pin and 8 pin ₅, 3,4,5,9,11,12,13,14 pin of chip meet the X on the output control line of local side controller ［ 27 ］ respectively ₁, X ₂, X ₃, X ₄, Y ₄, Y ₃, Y ₂, Y ₁End points, 16 pin are output, receive in the audio frequency coupling circuit and go, the output of shared transmitting branch ［ 32 ］ is connected with four shared branch roads of transceiver ［ 31 ］ simultaneously.

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