CN1120879A

CN1120879A - A telephone system and adapter therefor

Info

Publication number: CN1120879A
Application number: CN94191729A
Authority: CN
Inventors: 阿维施·雅各布·韦纳; 德奥·内迪维
Original assignee: Eisenberg Co Ltd
Current assignee: Eisenberg Co Ltd
Priority date: 1993-02-09
Filing date: 1994-02-09
Publication date: 1996-04-17
Also published as: EP0683953A1; WO1994018780A1; IL104668A; IL104668A0; CA2155665A1; AU6174794A; NZ262308A; AU682174B2

Abstract

A telephone adapter (21), comprising an outlet (32) for coupling to a telephone outlet socket having a d.c. voltage across a telephone line connected to a pair of terminals thereof, an inlet (34) for coupling to a telephone extension unit (20), and a switch connected between the outlet (32) and the inlet (34) and operable between a first position in which the telephone extension unit (20) is directly connected to the telephone outlet socket (33) and a second position in which the extension coupling means is a.c. coupled to the line coupling means so as to block said d.c. voltage when the adapter (21) is connected to the telephone outlet socket. The invention also contemplates a system comprising several adapters each connecting respective telephone extension units to a common telephone line, whereby a respective control unit operating in accordance with suitable logic permits connection of one extension unit to the telephone line (11) or, alternatively, to another internal extension unit. Such a system operates as a PABX, auto small exchange without requiring a line interface where the telephone line (11) connects to the extension units.

Description

A kind of telephone system and adapter thereof

The present invention relates to allow at least one external call line to be connected to a plurality of internal users, one of them can carry out the outside line conversation still makes remaining internal user carry out the sort of telephone system of interior lines conversation simultaneously.

Small branch exchange such as usually being provided with in office etc. allows a plurality of internal users to carry out the outside line conversation by one or more outside line, also use this system simultaneously as intercom and mutually interior lines converse.In these systems, each completely restricted extension has unique identification code, must dial this identification code in order to call out corresponding extension set.Usually, in order to obtain an outside line, must dial a certain special number, such as " 9 ".

Exist a large amount of this systems, the characteristic that each tool is different, but all existing systems all need the inner exchanging machine is connected in the outside line, are connected respectively on each completely restricted extension with the radial pattern configuration then.This requirement makes the installation cost height of this system, because each completely restricted extension must be connected on respectively on the inner exchanging machine, this is one and had not only taken labour but also time-consuming and inconvenient work.

Many small enterprises and family expenses are installed to have and are connected an extension in the single outside line publicly.This provides the convenience that can answer the call at a more than place, but do not provide a user can be whereby from a room via the INCOM intercom condition of another user's communication in telephone network and another room.Up to now, the inner exchanging machine that provides the unique method of this device that a above-mentioned type must be installed, this is to hinder the obvious fact of using in extensive use, the especially family of this system.

Proposed to solve at least in part the system of this requirement.For example No. 4821,319, United States Patent (USP) people such as () Middleton discloses and has been used to provide four interior lines services and to the single line telephonic communication system of PABX (PABX) the type characteristic of a plurality of handsets.Each handset is provided with a station adapter and is applicable to and connects on single a pair of indoor circuit, and also needs a line interface adapter that is connected between indoor circuit and the outside line in addition.The many complicated wiring that is associated with other system has been eliminated in the configuration that people such as Middleton propose, because each phone handset is parallel is connected on the indoor circuit and do not need to be wired on the line interface respectively.Thereby, on line interface, have only an internal interface line end.Even now, line interface itself must be connected in the outside line, does not just accomplish this point and this system is not installed, and this may be the consuming capacity that exceeds general domestic consumer.

United States Patent (USP) 4,893, No. 334 (Parnello) discloses a kind of intercommunicating system on many telephone sets that are used in a single extension set, comprises a single main website and a plurality of slave station.Connect main website so as to discontinue social contacts right in the telephone wire of a centrex.Each slave station mobile phone best and on the extension set is associated.When extension set was not used in INCOM intercom service or outside line conversation, any mobile phone with keypad on the extension set can both send by master unit and receive and the signal of decoding.When main website received this signal, it just disconnected the circuit from the extension set to the telephone exchange and telephone exchange is connected on the circuit, and the calling that this electric circuit inspection is come in is so that can send signal to the user.Main website also sends the signal that starts the INCOM intercom function to each slave station.

In this configuration, main website rises and the similar function of line interface shown in the people such as Middleton, is that it must be connected between external call line and the built-in system.

One object of the present invention is particularly suitable for small enterprise and dwelling house and uses for a kind of telephone system is provided, and it does not need the interface with the telephone wire that enters, and has therefore eliminated the demand to special equipment.

According to the present invention, provide a kind of telephone system.Comprise:

Be connected at least two phone lead-out wire sockets on the telephone wire, effect has a direct voltage on the telephone wire,

Be used to be connected a corresponding telephone extension unit on the telephone wire, and

The switching device of a correspondence, be connected between this phone lead-out wire socket respectively and the coupling corresponding extension unit thereon, and can between a primary importance and a second place, change, this extension unit directly links to each other with phone lead-out wire socket in primary importance, and in the second place this extension unit and phone lead-out wire socket AC coupled so as blocking-up from the direct voltage of extension unit;

This system also comprises relevant with each extension unit:

The call signal dispensing device is used for a call signal is sent to another extension unit;

A call signal detector is used to detect the described call signal of a remote phone extension unit transmission and generate a calling detection signal,

A calling indicating device responds this calling detection signal and calls out index signal to generate one,

A state indicating device generates corresponding condition indicative signal according to the state of system,

A starting drive is used to generate an enabling signal, and

A control unit, be coupling in this state indicating device, starting drive, call signal detector, call out on indicating device, call signal dispensing device and the switching device, and responsive state indication, startup and calling detection signal, and operate this calling indicating device, call signal dispensing device and switching device.

Also comprise a kind of adapter in the scope of the present invention, this adapter can be connected in traditional many subordinate machine systems of a shared public telephone line between its corresponding phone lead-out wire of each extension socket, so that all extension cell translation that will connect like this become to have the telephone system of the characteristic of all traditional PABX system.Comprise a control circuit in this adapter, be used to provide all facilities that are associated with these systems usually, therefore must duplicate some parts set in more advanced telephone set.In addition, also telephone set itself can be revised, in this case, just adapter can be saved so that comprise all specialized property of electric wire connecting junction therein.

In order to understand the present invention and to understand how to realize the present invention in practice, with the mode of limiting examples several preferred embodiments are described with reference to the accompanying drawings, in the accompanying drawing:

Fig. 1 is for showing the functional block diagram according to a system of the present invention;

Fig. 2 is used for the circuit diagram of an adapter of the system shown in Fig. 1 for schematic presentation;

Fig. 3 is for showing how a controller shown in Figure 2 is added the into block diagram of the system shown in Fig. 1; And

Fig. 4 to 10 is for showing the flow chart of the main operational steps that is associated with the adapter shown in Fig. 2.

Fig. 1 illustrates a system that uses 10 appointments generally, comprises the three pairs of telephone wires 11,12 and 13 that are connected on the central office switch 14.Telephone wire 11,12 is connected on the telephone set 15 via an adapter 16 with 13, and in a similar manner, an answering machine 17 is connected on telephone wire 11,12 and 13 via adapter 18.

Telephone wire 11 wherein has only an extension can start an outside line conversation, and the INCOM intercom facility is not provided corresponding to the normal tip and the ringing wire (Tip andring lines) that are connected the multi-extension telephone machine in the family expenses installation at large.This connection is by a telephone set 19 expressions that directly are connected on the telephone wire 11.In contrast, wherein show via adapter 21 and be connected a telephone set 20 on the telephone wire 11.Equally, the door lock 22 of a phone operation connects on online 11 via adapter 23; A modulator-demodulator 24 is connected on the telephone wire 11 via adapter 25; A facsimile machine 26 is connected on the telephone wire 11 via adapter 27; And remote-operated household electrical appliance 28 and 29 are connected on the telephone wire 11 via adapter 30.A control unit is coupling in the control sequence that is used to control all automatic extension units on the telephone wire 11 publicly, and this will specifically illustrate in greater detail with reference to Fig. 3 below.

All adapters shown in Fig. 1 are provided with and are shown schematically as an exit (constituting a circuit coupling device) of 32 and are used to be coupled to and schematically are appointed as a phone exit socket of 33, and are provided with and schematically are appointed as a leading-in end (constituting an extension set coupling device) of 34 and are used to be coupled to telephone corresponding.Thereby, by taking out telephone corresponding or other household electrical appliance from telephone wire, adapter being connected on its position, connecting telephone set or other household electrical appliance then and each adapter is connected on the telephone wire 11 via circuit coupling device 32.All adapters all are identical except the less important correction by the type defined of the household electrical appliance that it connected basically.Thereby, by it the adapter 21 that telephone set 20 connects on online 11 is provided with an inner ringer, with it the adapter 16 that telephone set 15 is connected on one of three lines 11,12 and 13 then there is not inner ringer.Similarly, the adapter 23 of controlling door lock 22 with it does not have inner ringer yet but is provided with an in check switchgear (not shown).

Referring to Fig. 2, a kind of concrete configuration of the adapter 27 shown in Fig. 1 is described below.To enter the tip of telephone wire 11 and ring terminals (see figure 1) via circuit coupling device 32 and be connected on separately the diode 40a and 40b, cross over their coupling optical coupler 41a separately and 41b (such as Motorola Inc with catalogue name 4N28 manufacturing).The emitter of optical coupler 41a and 41b is connected on the common bus 43 via rectification diode 42a and 42b separately.A DTMF (dual-tone multifrequency) transceiver 44 is connected on the bus 43 and via each capacitor 45a and 45b and is connected across on the telephone wire 11.Similarly, ringing detector 46 is connected on the bus 43 and also is connected across on the telephone wire 11.

Extension unit 20 is connected across on the telephone wire 11 via a pair of normally closed double pole double throw switch contact 47a and the 47b that is operated by relay A respectively.Corresponding normally opened

contact

48a and 48b are connected on the ring driver 49, and the latter also is connected on the common bus 43.Normally opened contact 48a is also connected on the local offhooking detector 50, the latter via the elementary winding coupled of coupling transformer 52 on power supply 51.

Ring trap filter and ring tone generator 53 are connected across on the secondary winding of coupling transformer 52 and are connected across on the telephone wire 11 via a pair of normally opened contact 54a and the 54b of a relay B, an ac coupling capacitor device 55 is connected between normally opened relay contact 54a and the telephone wire 11, thereby so that with direct voltage decoupling zero and form extension unit 20 on ring notch filter and the ring tone generator 53.The output of local offhooking detector 50 is coupling on the common bus 43 via rectifier diode 56.

Be connected across on the telephone wire 11 have in addition corresponding just with the bridge rectifier 57 of negative output bar 58a and 58b.Positive and negative output bars 58a of cross-over connection and 58b's is two voltage dividers that have resistor 59a, 59b respectively, reach 60a, 60b.The input of an inverter 61 is connected on the public wiring point between resistor 59a and the 59b, and inverter 62 then has an input on the common node that is connected resistor 60a and 60b.Inverter 61 and each output of 62 are coupling on the microcontroller 63.

The forward transportation shaping 58a of bridge rectifier 57 is connected on the sound signal transmitting apparatus 64, and the latter responsively is coupling on the microcontroller 63.A manually operated push-button switch 65 is connected on the microcontroller 63, and a LED 66 also connects thereon.A switch contact 67 responsively is coupling in the household electrical appliance 28 (shown in Fig. 1) that are used for operating and remote controlling on the microcontroller 63.

This system 10 is by the DC power supply that provides by the family expenses alternating current after the rectification usually.Be provided with that to schematically show be 68 back-up source, constitute by an internal battery usually, be used for when family expenses alternating current fault to inner circuit supply.

The following describes the operation of circuit.Diode 40a and 40b constitute an extension set on-hook/offhooking detector and pulse detector together with optical coupler 41a and 41b and rectifier diode 42a and 42b, and it is connected across the off-hook condition that is used for surveying any one extension unit on online 11 that is coupled on the telephone wire 11 and generates a total off hook signal.Diode 40a is in parallel with 41b so that polynary independence with 40b and optical coupler 41a separately, and make configuration with respect to tip and ring connecting line symmetry, and making no matter be connected on the circuit coupling device with what order tip and ring connecting line, circuit can both correctly be worked.

Capacitor 45a and 45b are used for DTMF transceiver 44 AC coupled at telephone wire 11, and capacitor 55 then is used for a voice signal on the telephone wire 11 is ac-coupled to ring notch filter and ring tone generator 53.

The internal communication of signaling between the extension unit (only showing extension unit 20 wherein among Fig. 2) is to accomplish by being ac-coupled on the telephone wire 11 by the sound signal of capacitor 55 and DTMF sounding via capacitor 45a and 45b.The AC coupled that is used for the communication between the system 10 is finished by pressed hand push button switch 65 before picking up mobile phone.Thereby, press the button switch 65 and cause being connected with interchange between the telephone wire 11 via transformer 52 and the extension unit 20 of capacitor 55.This is that state by changing relay A is whereby with extension unit 20 decoupling zero and replace and be connected to normally opened

relay contact

48a and 48b accomplishes from the telephone wire 11.In this case, power supply 51 is supplied with extension unit 20 by the elementary winding of transformer 52 with the direct current speech voltage.

When pressing the button switch 65, just transmitting one, so-called " clever sign indicating number (" smart code ") at this moment just can be picked up the mobile phone of extension unit 20 and dial the extension number of another completely restricted extension unit with pulse or DTMF mode at interval in (such as 5 seconds) at a preset time, is coupling in the extension number that all other adapters in the system can both receive " clever yard " and follow later via their DTMF transceiver 44 and ac coupling capacitor device 45a and 45b separately whereby.The extension number that has only the extension set adapter that is dialled just to respond to be dialled is its extension unit of AC coupled by the state that changes its relay B, subsequently, its direct current speech voltage will be supplied with rather than be supplied with by telephone wire 11 by the corresponding power 51 of itself adapter 27 inside.Simultaneously, its adapter and all other extension units of the extension number dialled of nonrecognition state that will change their relay A separately under the control of their microcontrollers 63 separately separately in the system is so that disconnect their extension unit 20 and prevent their eavesdropping Internal call persons and talked with by the inside between the extension number of inner dialing from telephone wire 11.

In a similar fashion, any one participant who attends can allow intrasystem other completely restricted extension unit to participate in ongoing dialogue by the extension number of pressing its push-button switch 65 and group another unit, thereby allows conference call.If receive an External Call after producing an INCOM intercom, then ring tone generator 53 generates the indication tone that a kind of all inner participants can both hear, has occurred an External Call on the line with indication.Will be as the back specifically with reference to Fig. 5 explanation, when pressing the button switch 65, just changed the state of relay A and B, thereby the relay B that had connected in the past is disconnected now, is connected to now on normally closed contact 47a and the 47b and be connected in the past the relay A that normal off opens on contact 48a and the 48b.Use this measure,, and they directly are connected in the outside line 11 from the completely restricted extension unit disconnection direct current speech voltage of all participations.Rely on to have disconnected ring tone generator 53, just interrupted the ring tone, rely on extension unit directly is connected on the telephone wire 11, just can receive External Call.

A light-emitting diode (LED) 66 can responsively be coupling on the output of microcontroller 63, no matter so that current extension unit 20 externally or in the off-hook in the internal communication pattern time, provides a visible indication when occurring calling out.In this condition, the relay A that switches current extension unit 20 makes extension unit 20 direct current from the telephone wire 11 disconnect, and also disconnects relay B simultaneously and makes current extension unit 20 also exchange from telephone wire 11 to disconnect.Thereby indicate this situation (constituting one the 3rd position of switching device) by the LED20 that lights.

Direct current offers system via power supply 68, and power supply 68 is typically to be obtained by the interchange domestic power supply after rectification of the storage battery reserve of an inner rechargeable.When the family expenses AC power failure, all adapters all are connected on the telephone wire 11 by their extension units 20 separately, though and system 10 is not re-used as an inner exchanging machine system works, yet extension unit 20 will continue as normal extension unit work.

Diode 40a and 40b are together with optical coupler 41a and 41b and rectifier diode 42a and extension set off-hook of 42b formation and pulse dialing detector 70, and it plays two aspects.The first, its detects whether off-hook of extension unit 20.The second, when extension unit 20 adopts pulse dialings, the pulse of being dialled be by extension set off-hook and 70 detections of pulse dialing detector and present to microcontroller 63, the latter instructs DTMF transceiver 44 to transmit the pulse of being dialled with DTMF.Local offhooking detector 50 detects local off-hook condition when extension unit 20 connects into the internal communication pattern.

Bridge rectifier 57 constitutes a total off-hook and zero deep-sited pulse towards detector 72 together with voltage divider 59a, 59b and 60a, 60b and inverter 61 and 62, in picking up system 10 mobile phone of any extension unit or another extension unit from telephone wire 11 send one zero deep-sited pulse towards the time, it just generates a total off hook signal.

When transformer 52 constitutes an ac-coupled circuit 73 and is used for needing to be connected to another completely restricted extension unit during the INCOM intercom pattern together with ring notch filter and ring tone generator 53, relay B and capacitor 55, extension unit 20 is connected on the telephone wire 11.

Rectifier diode 42a, 42b and 56 constitute the OR-gate of local offhooking detector 50, extension set off-hook and pulse dialing detector 70 respectively, make that any one generates in the incident of suitable detection signal in these detectors, a local off hook signal is presented to microcontroller 63 via common bus 43.

The positive and negative output bars 58a of cross-over connection bridge rectifier 57 and the voltage of 58b are approximately 50 volts of direct currents, and this is the direct voltage of cross-over connection telephone wire 11.On the other hand, must supply with

inverter

61 and 62 and the voltage of supplying with microcontroller 63 should not be higher than about 5 volts of direct currents.If picked up the mobile phone of an extension unit, just the voltage of cross-over connection telephone wire 11 drops to about 10 volts of direct currents from the original value of 50 volts of direct currents in the whole system 10.Thereby, can utilize voltage drop to determine a total off-hook condition.

In summing up in the point that a practical embodiments of practice, the value of resistor 59a and 59b is respectively 50M Ω and 50M Ω, make that the voltage on their common node is about 5 volts when therefore the voltage of having closed all mobile phones and cross-over connection telephone wire 11 become 50 volts of direct currents.In this case, the voltage on the output of inverter 61 is 0 (logic low).If at this moment picked up one of mobile phone, the voltage that cross-over connection telephone wire 11 occurs is just reduced to about 10 volts of direct currents from about 50 volts of direct currents, the voltage that appears at subsequently on the common node of resistor 59a and 59b just is brought down below 1 volt of direct current, and at this moment the output of inverter 61 enter logic high.Thereby voltage divider 59a and 59b constitute a total offhooking detector together with inverter 61, when being used for the mobile phone whenever any extension unit 20 of picking up system 10, generate a total off hook signal.

The value of resistor 60a is that the value of 50M Ω resistor 60b then is 30M Ω.Therefore, when the voltage of closeall mobile phone and leap telephone wire 11 was 50 volts of direct currents, the voltage that occurs on the common node of resistor 60a and 60b was approximately 30 volts of direct currents.Yet in fact this voltage can not exist, because the inverter 62 that is connected on the common node of resistor 60a and 60b is cmos circuits, has the internal protection diode of voltage clamp on the highest 5 volts of direct currents.The high value of resistor 60a and 60b guarantees to have only minimum electric current to flow to inverter 62 (in order to avoid damaging the internal protection diode), and under normal operation, therefore the voltage that occurs on the common node of resistor 60a and 60b be clamped on 5 volts of direct currents.

Reduce to 10 volts of direct currents if at this moment cross over the voltage of telephone wire 11, then the voltage on the input of inverter 62 is reduced to 6 volts of direct currents (from the theoretical value of 30 volts of direct currents), thereby makes the output of inverter 62 keep low.Even picked up more than one mobile phone in the system 10 simultaneously, and made line voltage distribution reduce to a less value from 10 volts of direct currents, the voltage that appears on the common node of resistor 60a and 60b is still high as to be enough to guarantee that the output of inverter 62 keeps low.

Yet, when picking up arbitrary mobile phone and simultaneously telephone wire 11 is by temporary transient short circuits, appear at voltage on the common node of resistor 60a and 60b and drop to zeroly, in this case, the voltage that appears on the output of inverter 62 rises to height.When pressing the button switch 65, telephone wire 11 is short circuit temporarily really, and this is to take place under the control of microcontroller 63 or when picking up or putting back to the mobile phone of extension unit 20 in the INCOM intercom pattern.Thereby voltage divider 60a, 60b constitute a 0-10 and 10-50 deep-sited pulse towards detector together with inverter 62, and when pressing the button switch 65 and need wake DTMF transceiver in all the other all adapters up, it just generates a detection signal.

The household electrical appliance 28 that switch 67 is worked under the control of microcontroller 63 and controlled remote control make and can or turn off household electrical appliance with the phone remote activation.Sound signal generates equipment 64 and is made of spring sound device, buzzer or a loud speaker usually, just sends sound signal or sound notification when being subjected to visiting under the control of microcontroller 63.DTMF transceiver 44, ringing detector 46, ring driver 49, local offhooking detector 50, ring notch filter and ring tone generator 53 and sound signal generation equipment 64 all be person skilled in the art person known standarized component, therefore need not further description.To specifically describe the operation and the programming of microcontroller 63 in detail below with reference to the flow chart shown in Fig. 4 to 10.

Should be understood that in the adapter schematically illustrated in Fig. 2 26, DTMF transceiver 44 keep dormancy (promptly inactive) when being pressed push-button switch 65 or in the INCOM intercom pattern, to pick up or zero deep-sited pulse that produced when putting back to mobile phone till wake up.Then it just under the control of microcontroller 63 operation carry out needed any function, after this it once again (under the control of microcontroller 63) be switched off up to being waken up once more later on by another pulse.This is necessary, especially when adapter 21 is operated by internal battery 68, because the most of parts when inoperation in the adapter 21 only need minimum electric current, DTMF transceiver 44 then has the current drain of 10MA, this can about two weeks with the interior internal battery 68 that just runs out of.By 45 of DTMF transceivers are worked when needed, because the current drain of remaining part is the order of magnitude of 20-30 μ A, so the life-span of internal battery 68 can extend to about 2 years.

In addition, by only when needs send or receive dtmf signal, just waking DTMF transceiver 44 up, just can guarantee that a dtmf signal that sends on telephone wire 11 does not act on, push-button switch 65 has waken up unless the DTMF transceiver 44 of corresponding adapter 21 has been pressed earlier.This replys an External Call and is important by pressing the button that switch 65 (so that waking DTMF transceiver 44 up) dials suitable internal number then and this calling is transferred in the situation of another completely restricted extension at an internal user.The corresponding DTMF sign indicating number of Sheng Chenging not only is transferred to this completely restricted extension like this, and in fact also transmission on telephone wire 11.Obviously do not wish to make the dtmf signal of transmission to startle a completely restricted extension that has the extension address sign indicating number identical on the far-end with the local extension set that this calling will be sent to it.Yet in fact this can not take place, though because the really transmission on telephone wire 11 of this dtmf signal, be not transferred to its wake-up signal because the extension set on the far-end keeps dormancy and its DTMF transceiver does not receive this signal.

Fig. 3 illustrates in greater detail the being used for controller 31 that allowance (connecting and control) is connected all the automatic-answering back device extension units on the telephone wire 11 shown in Fig. 1.When needing, controller 31 can be coupled on the multiple phone line.

Controller 31 comprises a DTMF/ impulse circuit interface 75 that is connected on the telephone wire 11.An offhooking detector 76 and a ringing detector 77 are coupling on the telephone wire 11 equally, are connected to simultaneously on the microcontroller 78, and a DTMF receiver 80 also is coupled on microcontroller.A fax modem signal detector 81 is connected on telephone wire 11 and the microcontroller 78.This circuit is by power supply 82 power supplies, and this power supply can be from the household AC power after the rectification or also can be obtained from an inner backup battery.

The operation of controller 31 is as follows.Ringing detector 77 detects an outside line ring and wakes microcontroller 78 up on telephone wire 11.Microcontroller 78 allows that a local user has adequate time, for example ring is four times, picks up the mobile phone of coupling extension unit thereon, if after this do not pick up local handset, then controller 31 just is connected across the load of one 600 Ω on the telephone wire 11, thus the simulation off-hook condition.DTMF/ impulse circuit interface 75 generates the pseudo-bell signal of a different frequency and it is transmitted along telephone wire 11.With this method, an External Call person obtains the impression of extension set in on-hook.

Yet if the remote call-in person is a machine, such as a facsimile machine or modulator-demodulator, it is ignored pseudo-bell signal and detects the off hook state of local extension unit and begin to send its handshaking protocol signal.In order to determine whether the remote call-in person to be connected to a playscript with stage directions ground facsimile machine, computer modulating demodulator, remote-operated household electrical appliance etc., the facsimile machine in the controller 31/modem signal detector 81 is according to its handshaking protocol signal desired COS of person of discerning the remote call-in.If in a preset time (such as three seconds) do not detect above-mentioned signal, it is local echoing machine service and send an appropriate control signals to microcontroller 78 that controller 31 is just supposed desired, and the latter generates suitable " a clever sign indicating number " again and comes the extension unit of addressing correspondence.

Fig. 4 to 10 describes the logic that microcontroller 63 (Fig. 1) is operated according to this in detail.Fig. 4 is depicted as the state of judging each adapter and the main routine of carrying out continuously (100) transferred to subroutine in case of necessity.

Particularly, in step 101, call the state that an initialization procedure is checked relay A and B, and they are turned back to their reset modes separately where necessary, as shown in Figure 2, all inner marks similarly also reset.

In step 102, judge the state of total offhooking detector 72 and local offhooking detector 50.Contain or picked up an outside mobile phone or do not picked up local handset with the negative reply of step 102, in last situation, total offhooking detector 72 generates the local offhooking detector 50 of signal and does not then generate, in one situation of back, total offhooking detector 72 and local offhooking detector 50 do not generate signal.In arbitrary situation, judge the check whether total offhooking detector 72 has generated a signal in step 104.If, just contain and picked up intrasystem another mobile phone, transfer to outside line appurtenant machine routine in step 105 control in this case, with reference to Fig. 6 it is described in more detail below.

If do not detect signal at the total offhooking detector 72 of step 104, then carry out check and judge the push-button switch of whether supressing in the local handset 65 in step 106.If, then transfer to INCOM intercom master routine at step 107 once single spring sound of starting and control, this will specifically be described in detail with reference to Fig. 7 below.

If do not pressed the button switch 65, then judge whether detected a pulse in step 108 check, if, being controlled at step 109 and transferring to INCOM intercom appurtenant machine routine, this will specifically be described with reference to Fig. 8 below in detail.If do not detect pulse, then judge in step 110 check whether ringing detector 46 has detected a bell signal.If just set " ring " four seconds of sign and control and transfer to the place that begins that circulates in step 102 place in step 111.

Yet, if in step 102, detected signal from total offhooking detector 72 and local offhooking detector 50 boths, this means and picked up current mobile phone that this may be that one of two kinds of reasons cause.Perhaps local handset will start call, and perhaps local handset receives an External Call and replied this calling.Therefore, judge the state that " ring " indicates in step 112, as illustrating, it is to be provided with immediately after ringing detector 46 detects a bell signal that is caused by the calling that enters.If " ring " is masked as OFF, then be controlled at the outside line main frame routine that step 113 is transferred to step 200 place.Otherwise, be controlled at the outside line main frame routine that step 114 is transferred to step 202 place.

Referring to Fig. 5, the key step of outside line main frame routine 200 is described below.In step 201, the INCOM intercom sign that resets in case of necessity, and blocking-up push-button switch 65 five seconds.From the description of top Fig. 4, as can be known, only be masked as OFF and execution in step 201 just when containing local handset call will be started in " ring ".Describe as following, the function of push-button switch 65 is for starting internal call, and in this pattern, must be before picking up mobile phone rather than press it afterwards.Therefore, for fear of any obscuring and the user being forgotten before picking up mobile phone, press push button 65 of may occurring, so, make that pressing the button switch 65 does not unintentionally produce consequence with time interval of a weak point of push-button switch 65 blocking-up.Yet, after five seconds the time interval, allow once again to enable push-button switch 65 so that allow transfer call or call conference call of user at session.

In step 202, judge the state of total offhooking detector 72, if it does not detect signal, then transfer to the main routine at step 100 place, as shown in Figure 4 in step 203 control.If total offhooking detector 72 detects a signal, then judge the state of local offhooking detector 50 in step 204.If it does not receive signal, then in step 205 in order to check the possibility of putting back to immediately after picking up local handset and judge the state of total offhooking detector 72 again.In these situations, detect less than total off hook signal, therefore at step 205A, the main routine at step 100 place is transferred in control again.If still detect a total off hook signal in step 205, then be controlled at step 205B and transfer to outside line appurtenant machine routine, this routine is described with reference to Fig. 6 below.

Yet, if detect a local off hook signal, this means that local handset do not put back to, therefore carry out check and judge whether current adapter receives one " clever sign indicating number " from a long-range built-in adapter at step 205C.When a local user picks up its mobile phone for the purpose of carrying out External Call but finds that circuit is occupied owing to exist the outside line conversation, can send this " clever sign indicating number ".In this case, another adapter is an outside line subordinate adapter, and as below will be specifically with reference to Fig. 6 explanation, for warn the outside line main frame it to use outside line and send " warning " signal.In this case, the outside line main frame has two kinds of selections: in order to start one " clever sign indicating number " outside line subordinate adapter can be connected immediately, he can press the button switch 65 immediately; Perhaps through after ten seconds comity time, in any case all will connect outside line subordinate adapter.

This logic is reflected in step 205E place, wherein be provided with ten seconds timer, during this, hear the spring sound in the adapter of outside line main frame,, make check and judge that whether the outside line main frame is in order to allow that connecting outside line subordinate adapter supresses its push-button switch 65 in step 207.If not, then circulate and repeat from step 202.Yet, if supressed push-button switch 65 in step 207, if perhaps be through with ten second time interval in step 206, just stop the spring sound and allow to use push-button switch, so that produce the effect that push-button switch 65 has been pressed.At this moment the output of step 207 is sure and stops the spring sound in step 208, wakes DTMF up and generates by one " clever sign indicating number " after the pulse and and then constituting such as one " # " so that allow outside line subordinate adapter to add dialogue.Thereby when the outside line primary adapter was not invested outside line subordinate adapter inlet by the suitable transmission of " clever sign indicating number ", time-delay in ten seconds just provided an outside line subordinate adapter with discontinuous connection.In fact, existing now two the outside line main frames that add the mobile phone of dialogue just now that reach corresponding to current phone in the system.

Up to the present in the described logic, the second outside line main frame is initiatively participated in dialogue by sending an interrupt signal.Yet,, can initiatively determine to comprise another local handset corresponding to the outside line main frame of the current phone of being engaged in outside line conversation according to another scheme.This is by pressing the button switch 65 and dial the local extension number of desired extension unit then and finish in order to send one " clever sign indicating number ".

In step 209, determined to supress push-button switch, wake DTMF up and be provided with five seconds timers (step 208), just carry out check and judge whether detect local off hook signal.This test is necessary, although detected this fact of local off hook signal in step 204, because if current phone pulse dialing work, then local off hook signal will be rendered as vibration between ON (leading to) and OFF (breaking) in per 0.05 second.Thereby, if do not detect local off hook signal in step 209, then carry out check and judge whether local handset adopts pulse dialing in step 210, if, then step 211 with dialled the sign indicating number from the pulses switch to DTMF, road along the line sends this dtmf signal, stops dtmf signal and controls and transfer to step 202.

Otherwise, step 212 is transferred in control, whether check detects a total off hook signal, and at the fixed local off hook signal of step 209, if not, then current mobile phone (it is the outside line main frame) is the mobile phone of unique off-hook in the system, transfers to major cycle 100 and be controlled at step 213, and major cycle was described with reference to Fig. 4.Yet,, further check to judge whether detect local off hook signal in step 214 if detect a total off hook signal.This further check be necessary, be stranded for current mobile phone may be in order to be transferred to external call the number that another completely restricted extension has been dialled this extension set, and put back to its mobile phone.Certainly, detect in this case that current phone changes to outside line appurtenant machine state from the outside line Host Status less than local off hook signal, transfer to outside line appurtenant machine routine 300 and be controlled at step 215, this routine will be described in detail with reference to Fig. 6 below.

Yet,, judge the state of push-button switch 65 in step 216 if detect a local off hook signal in step 214.If current phone still is being transferred to call in the process of another completely restricted extension by DTMF, then push-button switch will be pressed, and in this case, control is transferred to step 208.Otherwise, in step 217, determine elapsed time at interval, if 5 second time interval is not intact excessively as yet,, control goes repetitive cycling just transferring to step 209.Otherwise, in the past during 5 seconds, step 202 is transferred in control.

Referring to Fig. 6, outside line appurtenant machine routine 300 is described below.To a certain degree explained with reference to Fig. 5 as top, an outside line appurtenant machine is when engaging in the dialogue between an External Call machine and at least one outside line main frame, any completely restricted extension that on-hook.Outside line appurtenant machine routine 300 allows the outside line appurtenant machines to interrupt the possibility of outside line main frames, has as described above, perhaps can accept the dialing of outside line main frame and External Call is transferred to this outside line appurtenant machine promptly allows this appurtenant machine to participate in dialogue.

When entering outside line appurtenant machine routine 300, the relay A in the outside line subordinate adapter is reset extension unit 20 is connected on the telephone wire 11.Therefore, for extension unit is set relay A from the circuit disconnection at its place and in step 302, judge the state of total offhooking detector in step 302.If do not detect total off hook signal, then the outside line main frame of off-hook becomes on-hook immediately, and therefore at step 303 reset relay A, permission is used the push-button switch 65 in the local adapter and controlled and transfer to the top main routine of describing with reference to Fig. 4 100.

Otherwise if detect a total off hook signal, then the outside line main frame remains connection, and judges the state of the push-button switch 65 in the local adapter at step 302A.If it is pressed, then send a single spring sound at step 302B, the back and then one dash by zero deep-sited pulse and the back with " the clever sign indicating number " that constitute such as DTMF " A ".Also produce a series of DTMF spring sounds so that provide a state indication to the outside line appurtenant machine.Simultaneously, clever sign indicating number is transferred to the outside line main frame and makes wherein produce a series of DTMF spring sounds, so that provide corresponding state indication to the outside line main frame.Illustrated as the front, and at this moment started ten seconds timer and the sign that pauses is set.Whether ten seconds time restrictions of step 302C check are intact excessively, in this case at step 302B reset relay A, whereby local handset is connected on the line, on this circuit, this local call extension unit becomes an outside line main frame and controls and transfer to step 202 (Fig. 5).If ten second time limit is not intact excessively as yet, even just then judge whether received the outside line main frame in order before having crossed ten second time limit local extension unit to be connected in the dialogue and along a pulse of telephone wire 11 transmissions in step 304 check.If do not detect this pulse, just control is transferred to step 302 and repetitive cycling.Otherwise, supply to detect an interrupt signal that send by the outside line main frame, in order to allow time enough, and wake one second kind of DTMF up, if do not detect this signal again, just step 302 is transferred in control to constitute such as DTMF " # " in step 306.Otherwise, at judge the to pause state of sign of step 307, and if it is provided with, then stop DTMF spring sound (this in step 302B startup to send indication) to the outside line appurtenant machine at step 307B, reset relay A, and the outside line main frame routine (see figure 5) at step 202 place is transferred in control.

If in step 307 sign that pauses is not set, this means that the outside line main frame attempts to call out local extension unit on one's own initiative rather than local extension unit request is done like this.In this case, set 5 seconds timer, and step 308 to circulation of 309 formations checks whether received any DTMF numeral at step 307C.When 5 second time interval finished, if do not receive the DTMF numeral, then stop DTMF, and control turns back to step 302 in step 310.

If receive a DTMF numeral in step 308, then whether the DTMF numeral that is received in step 311 check is corresponding to the sign indicating number of current adapter.If not, then step 312 checks whether the DTMF sign indicating number that is received is " 0 ".If not, just stop DTMF, and control turns back to step 302 in step 313.Yet, if receive DTMF sign indicating number " 0 ", just whether receive another DTMF numeral in step 314 check, if then the DTMF numeral that is received in step 315 storage stops DTMF, and step 316 is transferred in control, starts the connection routine of describing in detail below with reference to Fig. 9.If do not receive other DTMF numeral in step 314, then step 317 allows repeated execution of steps 314 when 5 second time interval do not cross as yet, and perhaps step 318 makes control transfer to step 310, stops DTMF and step 302 is returned in control.If in yard the address code that step 311 received corresponding to current phone, then start the connection routine once again, so that the extension unit that is addressed can be connected on the telephone wire, whereby its state is changed to the outside line main frame from the outside line appurtenant machine.

When reference Fig. 9 has described the connection routine, step 312 (whether its DTMF sign indicating number of being received of check is " 0 ") and related step 314 and 315 (their allow to store one after with the DTMF numeral) meaning will become clear.Yet, present stage in brief, it allows that the outside line main frame calls out a desired outside line appurtenant machine by sending to all outside line appurtenant machines with the spring sound of the corresponding given number of address code of desired outside line appurtenant machine, and one is identified this yard and just can pick up in the outside line appurtenant machine any one for the internal user of its extension number.In contrast, the DTMF numeral of only dialling desired adapter will only make this adapter ring, and if the user in another room, he will not receive the indication of attempting to transfer.

Fig. 7 illustrates the logic relevant with INCOM intercom master routine 400, and this routine pressed the button switch 65 and calls when reporting system will be transferred to an internal call whereby before an extension unit is picked up mobile phone.

In step 401, finish various initialization steps, especially wake DTMF up and send after the pulse with such as " # " along telephone wire, stop DTMF then.Relay A is arranged to extension unit is changed over AC coupled via transformer 52 and capacitor 54a to the coupling of telephone wire from direct coupling.In step 402, the testing total off hook signal.If ON this means that another extension unit picked up mobile phone, therefore, describe with reference to Fig. 6 as top at reset timer and call outside line appurtenant machine routine 300 of step 403.Otherwise, have only the mobile phone of current extension unit to be picked up, and assess the output of ringing detector 46 in step 404.If ON then is an External Call on the circuit, and step 405 reset timer and make control transfer to main routine 100, as shown in Figure 4.As do not detect bell signal, then judge the state of local offhooking detector 50 in step 406.If ON has then picked up local handset and has set relay B in step 407, wake DTMF up and send one and be used for the user number counting variable that increment is stored in all adapters such as DTMF sign indicating numbers such as " C ", as described below.Simultaneously, set five seconds timer.Otherwise, if do not detect local off hook signal in step 406, though this means and supress push-button switch 65 but do not pick up mobile phone, and that step 408 allows to repeat this circulation is at interval intact excessively up to five-second period, this moment is in the step poly-409, if mobile phone is not picked up yet, just main routine 100 shown in Figure 4 is transferred in control.

Yet, if in 5 second time interval, picked up mobile phone, just can dial a completely restricted extension sign indicating number in order to call out another completely restricted extension.Thereby whether the current extension of step 410 check unit adopts pulse dialing, as whether, whether has a dtmf signal in step 411 check.If do not detect dtmf signal, then check the state of local offhooking detector once more, and if sure, bell signal of step 413 check is to allow the arrival of a possible External Call in step 412.If do not detect bell signal, then whether step 414 5 second time interval of check finishes, and in this case, step 434 is transferred in control, and this will describe in detail below.Otherwise, repeat this circulation and crossed or up to owing to one of following condition withdraws from circulation up to 5 second time interval.

Should point out that subscriber's meter is whenever picking up a local handset and system in the INCOM intercom pattern time, with respect to each the adapter increment in the system 10.Thereby, before receiving an External Call, the subscriber's meter in the necessary resetting system in all adapters.Thereby if detect a bell signal in step 413, then step 416 is checked and whether is supressed push-button switch 65 for the purpose of accepting External Call.If supress push-button switch 65, then send spring sound, reset relay B in step 417, INCOM intercom sign (being provided with in step 401) resets, the main routine 100 shown in Fig. 4 is transferred in reset relay A and control, thereby the intercom master set direct current is connected on the telephone wire 11, becomes the outside line main frame whereby so that can accept External Call.Because the outside line main frame is an off-hook, total offhooking detector 72 generates a total off hook signal, this is responded the subscriber's meter in all extension unit that reset.

If in step 416, do not press the button switch 65, then control is transferred to 410 and is gone to repeat this circulation, and the push-button switch 65 in supressing local extension unit or up to the end in 5 second time interval is transferred to step 434 and control.If do not detect local off hook signal in step 412, this shows has put back to local handset.Therefore, wake DTMF up, send one and disconnect sign indicating number " D ", stop DTMF, subscriber's meter in all adapters of increment and reset relay B in step 418.If in step 419, user number counting is then transferred to the step 525 of INCOM intercom appurtenant machine routine greater than " 0 " at the current control unit of step 420, and this routine will specifically be described in detail with reference to Fig. 8 below.Otherwise if user number counting is " 0 ", this shows that all local handsets all put back to, comprising current phone, therefore in step 421, reset relay A, reset at the INCOM intercom sign that step 401 is provided with, and the main routine 100 shown in Fig. 4 is transferred in control.

In step 410, if the test of paired pulses dialing is sure, then pulses switch is become dtmf signal in step 422, set 15 seconds timer road also along the line and send the spring sound.In step 423, if current phone under DTMF, work, just set these 15 seconds timers and send the spring sound.Whether step 424 check DTMF sign indicating number is " C " (promptly connecting).If not, whether step 425 check has detected local off hook signal.If whether step 426 check ringing detector 46 detects a bell signal, if not, whether step 427 detects has supressed push-button switch 65.If not, whether step 428 15 second time interval of check finishes, and repeats to finish up to 15 second time interval from the circulation of step 424 beginning.If supress push-button switch 65 in step 427, step 429 15 seconds timers that reset then send after the pulse with such as " # ", and control this moment is transferred to step 410 and allowed intercom master set to dial another completely restricted extension.

If in step 428,15 second time interval is intact excessively, and then step 430 stops DTMF, stops the spring sound and control is turned back to step 434.Connect sign indicating number (such as DTMF " C ") if detect one in step 434, then step 431 timer that resets stops the spring sound, and increment is with respect to the user number counting of adapters all in the system, and step 434 is transferred in control after this.If in step 426, detect a bell signal, then the state of step 432 checkout button switch 65.If supress push-button switch 65, then transfer to step 417, so that the External Call machine can be connected from step 433.

If detect a pulse in step 434, this shows that another completely restricted extension unit (constituting an INCOM intercom appurtenant machine) require to participate in dialogue and supressed push-button switch on its mobile phone and reminded its requirement of connecting of intercom master set.If do not detect pulse, then whether step 435 check detects local off hook signal, if whether step 436 check detects a bell signal.If not, might require to connect and remind the intercom master set this point by pressing its push-button switch in another completely restricted extension unit, thereby be provided with the sign that pauses at step 445B.Whether step 436A check is provided with the sign that pauses, and intercom master set has the connection of allowing for 10 seconds in this case, and failure back INCOM intercom appurtenant machine will under any circumstance carry out desired connection.Whether step 436B check has pass by this time interval of 10 seconds, and in this case, step 437C resets to pause and indicates, stops the spring sound, and control is turned back to step 434.Otherwise,, then check the state of the push-button switch 65 in the intercom master set if 10 second time interval do not finish as yet.If do not press, then control turns back to step 434.Otherwise, generate a single spring sound in step 438, stop the spring sound then, set 5 seconds timer, wake DTMF up, send after the pulse with such as " # ", and control turns back to step 410, allow intercom master set to dial the extension set sign indicating number and carry out being connected with the desired of INCOM intercom appurtenant machine accordingly.

If detect a pulse in step 434, this may be because the intercom master set of the inner dialogue of another participation requires to disconnect, perhaps in contrast: an INCOM intercom appurtenant machine requires to connect.In arbitrary situation, step 442 is waken DTMF up and is set one second timer and is used to receive a DTM F sign indicating number.Step 443,444,445 is checked the DTMF sign indicating number " C " that is connected, disconnects and report to the police that is used to carry out an inner subordinate mobile phone, " D " and " A " that arrived respectively with 445A in one second time interval.Connect sign indicating number if receive one, then step 446 increases user number counting and gives step 434 with control, repeats this circulation up to having put back to local handset, transfers to step 418 and control.Disconnect sign indicating number if receive one, then reduce user number counting, and step 419 is transferred in control.If receive an alarm code, then set 10 seconds timer at step 445B, the pause sign being set and sending the spring sound, so that remind the extension unit (INCOM intercom appurtenant machine) of a current disconnection of intercom master set to require connection along telephone wire.Control moves on to step 434 then.

Fig. 8 describes the INCOM intercom appurtenant machine routine 500 that walks abreast with the top intercom master set routine of describing with reference to Fig. 7 400.Therefore, even for the sake of completeness, all relevant steps all illustrate in the drawings, but and are not described in detail all steps.

At the beginning, recalling INCOM intercom appurtenant machine routine 500 carries out in one of two kinds of conditions: intercom master set will be called out the mobile phone (INCOM intercom appurtenant machine) of a disconnection and participate in the dialogue that once exists; Perhaps the INCOM intercom appurtenant machine initiatively requires to participate in dialogue in arbitrary situation by sending an alarm signal, sets one second timer in step 501, wakes DTMF up, after this appearance of step 502 DTMF of check " # " sign indicating number.If do not occur, repeat this circulation and determine that up to step 503 one second time interval pass by, after this stop DTMF and main routine 100 (Fig. 4) is transferred in control in step 504.Yet if detect a DTMF " # " sign indicating number in step 502, step 504 is set 5 seconds timer and is waken DTMF up.The appearance of a total off hook signal of step 506 check, its appearance shows that one of extension unit is connected in the outside line certainly.Therefore in these conditions, do not allow other extension unit to interconnect, in step 507 user number counting that resets, the outside line appurtenant machine routine of describing with reference to Fig. 6 above reset relay B and control are transferred to 300 by the INCOM intercom pattern.

If do not detect total off hook signal in step 506, then whether step 508 check receives that intercom master set is used to connect INCOM intercom appurtenant machine mobile phone and a DTMF " C " sign indicating number that sends.If do not detect DTMF " C " sign indicating number, then step 509 makes circulation repeat to finish up to the 5 second time interval that is used to carry out desired connection, after this stops DTMF and controls and transfer to main routine 100 (Fig. 4) in step 510.Detect a DTMF " C " sign indicating number else if, then step 511 is provided with relay A, so that extension unit is connected on the circuit via transformer 52 and electric capacity 55, sets 6 seconds timer, wakes DTMF and increment user number counting up.Use this method, thereby another extension unit has been entered off-hook the number of off-hook mobile phone is increased by this Statement of Facts in the adapter of current INCOM intercom appurtenant machine, and guarantee that all adapters all are updated to the mobile phone number of the off-hook in the INCOM intercom pattern at any time.This is important, because in the INCOM intercom pattern, there is not total off hook signal, therefore judge any mobile phone whether the unique method of off-hook be the frequent counting that in all adapters, keeps the mobile phone of an off-hook, only when this number equals zero, know that just all mobile phones all put back to, thereby allow control to transfer to main routine 100 (Fig. 4).

Step 512 allows the INCOM intercom appurtenant machines to monitor the extension set sign indicating number that intercom master set is dialled to 520, and at the extension set sign indicating number of the extension set sign indicating number of being dialled and this INCOM intercom appurtenant machine to carrying out desired the connection at once.If wear before the extension set of being dialled " 0 ", then corresponding with the extension set of being dialled several times spring sound will be heard by INCOM intercom appurtenant machines all in the system.For example, if internal host will be dialled extension set 5, then can directly dial DTMF " 5 " (the extension unit ring that at this moment only is addressed); Perhaps can dial DTMF " 05 ", at this moment need only this timer not then, perhaps up to having picked up one of inner appurtenant machine mobile phone.On-hook adapters all in the system all will send the spring sound five.As top with reference to the explanation of outside appurtenant machine routine, just even this allow one not the User Recognition in his room he just called out, and the mobile phone (not necessarily he) that allows him to pick up any on-hook is participated in dialogue.

Whether step 521 to 524 checks receive a DTMF " D " sign indicating number or a DTMF " C " sign indicating number, indicate an internal host to disconnect respectively or another inner appurtenant machine connects, and user number counting is then done corresponding adjustment.

Crossed at interval and do not received in the situation of DTMF sign indicating number at five-second period, step 525 is transferred in control.In this case, step 525 stops DTMF and whether step 526 check detects a total off hook signal.If, step 527 user number counting that resets, reset relay B and transfer to outside appurtenant machine routine 300 (Fig. 6).If do not detect total off hook signal in step 526, then whether occur one 0 deep-sited pulse on the step 528 check circuit and dash the back with " # ", this is to be generated by an intercom master set supressing its push-button switch 65 before the extension set sign indicating number of dialling an inner appurtenant machine that will connect.If in step 529 sign that pauses is set, this shows that internal host starts to connect, and sets 5 seconds timer in this case, wakes DTMF up and control turns back to step 512, allows intercom master set to dial desired extension set sign indicating number.Otherwise if be provided with the sign that pauses in step 529, this shows that current adapter starts connection and intercom master set to reply by sending an alarm signal in ten second time interval, thereby allows the INCOM intercom appurtenant machine to carry out desired connection.In this case, step 534 is transferred in control, stop DTMF spring sound therein and relay B is set, connect current extension unit whereby, this unit has stopped becoming an intercom master set as an INCOM intercom appurtenant machine, and step 434 (see figure 7) in the intercom master set routine is transferred in control.

Fig. 9 illustrates and is connected routine 600 by top outside line appurtenant machines of describing with reference to Fig. 6 and 8 and INCOM intercom appurtenant machine routine call.Set 15 seconds timer in step 601, be used for allowing in 15 second time interval, connecting current extension unit.In step 602, stop DTMF, the current adapter of step 602 differentiation is simultaneously just directly dialled its extension number institute addressing or is dialled " 0 " earlier and is addressed.If do not detect " clever sign indicating number " in step 603, then the DTMF " D " that interior lines main frame extension unit of expression disconnects appears in step 603A check on the line.If detect DTMF " D ", then whether step 603B inspection user counting is zero, in this case, stops spring sound and control and transfers to main routine 100 (see figure 4)s.Otherwise step 603D stops the spring sound and control is turned back to the INCOM intercom appurtenant machine routine 500 shown in Fig. 8.If do not detect DTMF " D " sign indicating number at step 603A, then whether step 604 check exists local off hook signal, if there is no, and the state of step 604A check INCOM intercom sign.If be provided with, then system 10 is not in the INCOM intercom pattern, so whether step 604B check detects a total off hook signal.If not, step 604C stops the spring sound and control is returned to main routine 100 (Fig. 4).

Otherwise if detect a total off hook signal, this shows the modulated connection routine of having used of outside line appurtenant machine routine 300 (Fig. 6).Whatsoever routine call connects routine 600, all repeats this circulation in case of necessity, up to finishing to 15 second time interval or detecting one " clever sign indicating number " up to step 603, perhaps detects a local off hook signal up to step 604.If in step 605,15 second time interval finished, then step 606 stops the spring sound, and step 607,608 and 609 makes controls the step 525 of transferring to interior lines appurtenant machine routine or the step 300 that arrives outside line appurtenant machine routine, and this depends on which at first calls this connection routine in this two routine.

If detect one " clever sign indicating number " in step 603, then step 610,611 and 612 turns back to the step 501 of INCOM intercom appurtenant machine routine with control or to the step 305 of outside line appurtenant machine routine, this depends on that again which calls this connection routine in these two routines, otherwise, if detect a local off hook signal in step 604, then step 613,614 and 615 stops the spring sound and allows to use push-button switch.Moreover step 614 is provided with relay B, increases user number counting, and sends DTMF " C " and be used to connect the INCOM intercom appurtenant machine, and the step 434 of the intercom master set routine shown in Fig. 7 is transferred in control after this.Otherwise, for an outside line appurtenant machine, reset relay A, and this outside line main frame routine is transferred in control.

In described system up to the present, the condition of defaulting is the outside line main frame, thereby any extension unit can both start an External Call by picking up mobile phone, so that directly extension unit is coupling in the outside line 11, after this just can dial an outer extension number.In this configuration, before picking up mobile phone, press the button switch adapter is placed the INCOM intercom pattern.

Yet, understand easily, this only a kind of design alternative, and the condition of defaulting is that the INCOM intercom pattern also is same feasible, the condition of defaulting of one of them extension unit is an intercom master set, and must be by picking up mobile phone and selecting the outside line main frame such as dialling " 9 ".

Figure 10 is illustrated in the key step of calling in the configuration of what is called " main normal off create a precedent journey " 700.Step 701 initialization adapter disconnects relay A and is connected relay B, and the INCOM intercom sign is set.After this, whether step 703 check detects a local off hook signal, and if not, whether step 704 check detects one 0 deep-sited pulse is on the line dashed.If not, whether step 705 check ringing detector has detected a bell signal, and if not, whether step 706 check has detected a total off hook signal.Dash if detect one 0 deep-sited pulse in step 704, this shows that an intercom master set will call out one of on-hook extension unit, therefore is controlled at the interior lines appurtenant machine routine that step 707 is transferred to step 501 place.Otherwise,, then disconnects relay B and be connected relay A, and outside line main frame routine is transferred in control in step 708 if detect a bell signal in step 705.If detect a total off hook signal in step 706, this shows that another mobile phone has started an External Call, and in order to guarantee the right of privacy, step 709 disconnects relay B and transfers to the step 302 of the outside line appurtenant machine routine shown in Fig. 6.

If detect a local off hook signal in step 703, then step 710 is transferred in control, judges the state of push-button switch therein.If do not press it, then whether step 711 check has dialled " 9 ".This is suitable for all local extension units and is connected situation in the INCOM intercom pattern usually, and an outside line obtains by at first dialling " 9 ".If do not detect " 9 ", then whether step 712 check detects a local off hook signal, so that whether check puts back to the mobile phone of current extension unit, control turns back to step 703 in this case.If detect a button signal in step 710, then step 716 sends " clever sign indicating number " back with DTMF " C ", and the intercom master set routine shown in Fig. 7 is transferred in control, otherwise, if detect in step 711 " 9 ", this shows has dialled an outside line and step 717 disconnection relay B, connects relay A, and transfers to the step 202 of outside line main frame routine.

Dash if detect one 0 deep-sited pulse, then transfer to the step 501 (Fig. 8) of INCOM intercom appurtenant machine routine in step 718 control in step 713.Otherwise if do not detect bell signal in step 714, then whether step 715 check detects a total off hook signal.If not, step 703 is returned in control.

A bell signal occurs in step 714 and indicate once External Call on the circuit, step 719 disconnects relay B in this case, connects relay A and control is turned back to outside line main frame routine (Fig. 5).If detect a total off hook signal in step 715, this shows that outside line conversation carries out, step 720 disconnects relay B and control is turned back to the step 302 of outside line appurtenant machine routine in this case, after this, current extension unit stops to become an outside line appurtenant machine as an intercom master set.

Though the present invention is concrete with reference to providing a telephone system to outside line and completely restricted extension visit to describe, it also can be used for the system that only is used for inside such as field telephone.For example, field telephone only is provided with one and is connected many interior lines on the extension set that does not have an extension number.For " dialling " extension set, swagger usually or by a button, and this can generate the call signal that all interconnection extension set is all heard.This system does not provide privacy, and mobile phone separately just can be participated in dialogue because all extension sets need only be picked up them.

By with extension set via being connected on the interior lines according to adapter of the present invention, this field telephone just can be transformed into an intercommunicating system, wherein each extension set has unique extension number and can guarantee the right of privacy at two or more users' session, makes other user (i.e. " subordinate ") not hear dialogue by the mobile phone of picking up them.Because this system only is used for inside, the coupling alternating current-direct current that adapter provides all can.Yet should understand the needed adapter of this system and just go up the form of mask body with reference to a kind of simplification of the adapter of Fig. 2 detailed description.Particularly in the reducing adaptor for a field telephone system use, relay B, transformer 52, local offhooking detector 50 and total offhooking detector 72 all can save, and correspondingly change the logic of microcontroller.

Preferred embodiment allows addressable extension unit that a unique extension number is respectively arranged.Yet be appreciated that this is dispensable, and such as firm traditional field telephone of describing or have only two extension sets to connect on the line the situation and can save extension number.

Moreover, though the interchange coupling circuit in preferred embodiment comprises a transformer and a capacitor, be to be understood that other configuration, such as a single capacitor, also be suitable for.

It is that example is used that DTMF sign indicating number " # ", " A ", " C " that should also be understood that the connection that is used to call out switching and warning, extension unit and disconnection etc. waits with " D ".Other DTMF sign indicating number also can be used for equally well and above-mentioned dial logic compatibility.

Relay A and B it should also be further understood that, though also can use such as solid-state elements such as triacs to replace being to be used to operate various switches shown in the preferred embodiment.In order to observe the regulation of telephone operator, this triac is preferably in when powering up and disconnects.

Be depicted as normal off and open though also should understand remote-operated switch 67, it is also normally closed.Equally, multipole multithrow switch can be remote control, and switch can be dynamo-electric or solid-state, perhaps the switch of any kind in fact.

Be also pointed out that to comprise a kind of telephone plant of revising in the scope of the present invention all associated components that relative this adapter is described above comprising in this equipment.Obviously can save this adapter in this case.Moreover this adapter packs put into the unnecessary repetition that telephone plant itself has been avoided these parts, such as extension set offhooking detector, audio signal transmitting apparatus etc., they are needed in the adapter, but also all are arranged in the telephone plant in any situation.In the context of specification and appending claims, comprise any equipment that is connected on the telephone wire in the scope of " telephone plant " speech, such as extension unit, facsimile machine, automatic-answering back device machine or the like.

Thereby the present invention just just provides a kind of integrated telephony switch system by adapter of insertion between each phone subdivision phone lead-out wire socket corresponding with, and need not to install interface unit on telephone wire enters the point of system.Though described in outside line or INCOM intercom pattern the logic that the extension unit is connected in the system in detail, should be able to easily understand available in case of necessity facsimile machine, modulator-demodulator, answering machine, remote-operated household electrical appliance and wait and replace the extension unit.In this case, a standard telephone extension unit can be dialled suitable extension set sign indicating number and come addressing, any household electrical appliance then can respond suitable remote signal exchange agreement visit, perhaps in the situation of answering machine, just it are not conducted interviews when not picking up mobile phone in the ring of pre-determined number.

Claims

1. telephone system comprises:

At least two phone lead-out wire sockets are coupling on the telephone wire of a supply direct voltage,

The extension unit of a correspondence supplies to be coupling on the telephone wire, and

The switching device of a correspondence, be connected between each phone lead-out wire socket and thereon the corresponding extension unit of coupling, and can between a primary importance and a second place, switch, this extension unit directly is connected on the phone lead-out wire socket in primary importance, in the second place extension unit then be AC coupled on phone lead-out wire socket in case blocking-up from the described direct voltage of extension unit;

This system also comprises with respect to each extension unit:

The call signal dispensing device is used for a call signal is sent to another extension unit,

A calling indicating device responds this calling detection signal and generates a calling index signal,

A state indicating device, a kind of state of responding system generates the condition indicative signal of a correspondence,

A starting drive is used to generate an enabling signal, and

A control unit that is coupling on this state indicating device, starting drive, call signal detector, calling indicating device, call signal dispensing device and the switching device responds this state indication, startup and calling detection signal and operates this calling indicating device, call signal dispensing device and switching device.

2. according to the system of claim 1, wherein this switching device switches to one the 3rd position, and Dui Ying extension unit disconnects from telephone wire therein.

3. according to the system of claim 1, wherein:

This state indicating device comprises a total offhooking detector, is used for detecting a total off-hook condition of any one extension unit and generates a total off hook signal.

4. according to the system of claim 3, wherein:

This switching device switches to one the 3rd position, should disconnect from telephone wire correspondence extension unit therein,

This state indicating device also comprises an extension set offhooking detector, is used for detecting an extension set off-hook condition of corresponding extension unit and generating an extension set off hook signal, and

Respectively this control unit responds described total off hook signal and does not have a described extension set off hook signal, and the switching device of correspondence is switched on the 3rd position.

5. according to the system of claim 4, wherein:

Respectively this extension unit has a unique extension number,

This call signal dispensing device comprises code device, be used for along telephone wire send one with respect to the sign indicating number of another corresponding unique extension number in extension unit, and

Respectively this control unit enabling signal of also responding extension set off hook signal back makes the work of call signal dispensing device.

6. according to the system of claim 4, the enabling signal of this control unit response extension set off hook signal front and the switching device of correspondence is switched to the second place and sends a predetermined sign indicating number along telephone wire respectively wherein.

7. according to the system of claim 4, wherein respectively the enabling signal of this control unit response extension set off hook signal front switches to the switching device of correspondence primary importance and sends a predetermined sign indicating number along telephone wire.

8. according to the system of claim 4, wherein:

This calling indicating device comprises a ring tone generator, is used to generate an indication and the once indication tone of the outside calling that enters occurs, and

During the inside between at least two extension unit connects, control unit separately in described at least two extension unit also responds wherein any one enabling signal that starting drive generated separately, the switching device of correspondence is switched to primary importance, so that the extension unit direct current of correspondence is connected on the corresponding phone lead-out wire socket.

9. according to the system of claim 4, wherein one first INCOM intercom people on the first extension unit with during a outside line between the outside line telephone user is connected, the control unit that is coupling on the first extension unit responds the enabling signal that starting drive generated that is coupling on one the second extension unit, generates an alarm signal and is used to indicate the first INCOM intercom people, the second INCOM intercom people to require to use this system.

10. according to the system of claim 9, the control unit that wherein is coupling on the second extension unit responds the enabling signal that starting drive generated that is coupling on the first extension unit, and the switching device that is coupling on the second extension unit is switched to primary importance.

11. according to the system of claim 9, wherein:

The control unit that is coupling on the second extension unit comprises a timing device, is used for after having generated described enabling signal, generating the intact time signal of a mistake at interval through a preset time, and

This control unit responds this and has crossed time signal, and the switching device of correspondence is switched to primary importance.

12. system according to claim 4, comprise at least three extension unit, wherein during interior lines between first and second INCOM intercom people of the correspondence on first and second extension unit connect, each control unit that is coupling on first and second extension unit respectively responds the enabling signal that starting drive generated that is coupling on one the 3rd extension unit, and the warning signal that generates separately indicates one the 3rd INCOM intercom people of first and second INCOM intercom people to require to use this system.

13. system according to claim 12, wherein be coupling in control unit response on the 3rd extension unit and be coupling in the enabling signal that any one generated in each starting drive on first and second extension unit, the switching device that is coupling on the 3rd extension unit is switched to the second place.

14. system according to claim 12, the control unit that wherein is coupling on the 3rd extension unit comprises a timing device, be used for after generating described enabling signal, generating the intact time signal of a mistake at interval through a preset time, this control unit responds this and has crossed time signal, and separately switching device is switched to the second place.

15. according to the system of claim 3, wherein:

This switching device switches to one the 3rd position, and the extension unit with correspondence disconnects from telephone wire therein,

The corresponding total off hook signal of this control unit response reaches and does not have the extension set off hook signal, and switching device is switched to the 3rd position

16. according to the system of claim 6, wherein:

This control unit responds described predetermined sign indicating number, and switching device is switched to the 3rd position.

17. according to the system of claim 16, wherein said predetermined sign indicating number is that one zero deep-sited pulse is dashed the back with a dialing.

18. according to the system of claim 5, wherein:

This calling indicating device is the equipment that can hear, and

This call signal is to be encoded into the signal characteristic of hearing that generates a needed extension unit in the extension unit of each disconnection.

19. according to the system of claim 1, wherein each control unit also be coupled to the response this calling detection signal transmit audibly on the loud speaker separately of a call.

20. according to the system of claim 1, wherein:

At least one of extension unit is remote-operated household electrical appliance that respond enabling signal and operate, and

This control unit responds calling detection signal and generates enabling signal.

21. according to the system of claim 20, wherein these household electrical appliance are remote-operated switches.

22. according to the system of claim 1, comprise that also one is used to allow to connect and a controller of all automatic answering equipments of control connection on telephone wire, this controller comprises:

A switching device, be connected between this controller and the telephone wire and also can between a primary importance and a second place, switch, this controller directly is connected on the telephone wire in this primary importance, and in the second place this controller AC coupled on telephone wire, thereby blocking-up comes the described direct voltage of self-controller

A call signal detector, operation is used to detect a device type signal characteristic of a needed automatic answering equipment and generates a corresponding address signal after a total off-hook condition, and this automatic answering equipment will be coupled on the line,

The call signal dispensing device responds this address signal the call signal of a correspondence is sent to the automatic answering equipment of described needs, and

A control unit is coupling on this state indicating device, call signal detector, call signal dispensing device and the switching device, and responds this condition indicative signal and address signal comes Operational Call Sign dispensing device and switching device.

23. according to the system of claim 22, wherein:

This state indicating device comprises a total offhooking detector, is used for detecting total off-hook condition of any one extension unit, and generates a total off hook signal,

Also comprise a ringing detector, respond an outside bell signal, and generate the ring detection signal of a correspondence, and

This control unit is coupling on the ringing detector and responds the cumulative number that the ring detection signal is counted bell signal, so that generate a total off-hook condition after the bell signal of pre-determined number.

24. according to the system of claim 1, wherein this call signal detector is common dormancy, and responds a wake-up signal and operate.

25. according to the system of claim 24, wherein:

This enabling signal comprises one zero deep-sited pulse dashes, and

This call signal detector is coupling in one and is used to detect this zero deep-sited pulse and dashes and generate the zero deep-sited pulse of described wake-up signal towards detector.

26. according to the system of claim 1, wherein in the described second place of this switching device, extension unit separately is connected the phone lead-out wire via a capacitive circuit and broadcasts on the seat.

27. according to the system of claim 26, wherein said capacitive circuit also comprises a transformer.

28. a telephone adapter comprises:

The circuit coupling device is used to be coupled to the telephone wire with a direct voltage of its pair of terminals of cross-over connection,

An extension set coupling device is used to be coupled to an extension unit, and

A switching device, be connected between this circuit coupling device and this extension set coupling device, and can between a primary importance and a second place, operate, the extension unit directly is connected on the phone lead-out wire socket in primary importance, and in the second place this extension set coupling device AC coupled on the circuit coupling device, so that when adapter is connected on the phone lead-out wire socket, block described direct voltage.

29. according to the telephone adapter of claim 28, wherein this switching device switches to one the 3rd position, each extension unit disconnects from telephone wire therein.

30. the telephone adapter according to claim 28 also comprises:

The call signal dispensing device is used to send a call signal to another telephone adapter,

A call signal detector is used to detect the described call signal of a remote telephone adapters transmission and generate a calling detection signal,

A calling indicating device responds this calling detection signal and generates one and call out index signal,

A state indicating device, response is connected a kind of state of the institute's adapter on the telephone wire, and generates the condition indicative signal of a correspondence.

A starting drive is used to produce an enabling signal, and

A control unit, be coupling in this state indicating device, starting drive, call signal detector, call out on indicating device, call signal dispensing device and the switching device, and respond this state indication, startup and calling detection signal, operate this calling indicating device, call signal dispensing device and switching device.

31. connect the telephone adapter of wanting grave 30 according to right, wherein:

This state indicating device comprises a total offhooking detector, is used for detecting a total off-hook condition of any telephone adapter that is connected on the telephone wire and generates a total off hook signal.

32. according to the telephone adapter of claim 30, wherein:

This switching device switches to one the 3rd position, therein extension unit separately disconnected from telephone wire,

This state indicating device also comprises an extension set offhooking detector, is used for detecting an extension set off-hook condition of extension unit separately, and generates an extension set off hook signal, and

This control unit responds described total off hook signal and does not have described extension set off hook signal and this switching device is switched to the 3rd position.

33. according to the telephone adapter of claim 32, wherein:

This telephone adapter has a unique extension number,

This call signal dispensing device comprises code device, is used for sending a sign indicating number corresponding to unique extension number corresponding with another adapter along telephone wire, and

This control unit also responds the enabling signal of extension set off hook signal back and starts this call signal dispensing device.

34. according to the telephone adapter of claim 32, the enabling signal of this control unit response extension set off hook signal front wherein switches to the second place with separately switching device, and sends a predetermined sign indicating number along telephone wire.

35. according to the telephone adapter of claim 32, the enabling signal of this control unit response extension set off hook signal front wherein switches to primary importance with separately switching device, and sends a predetermined sign indicating number along telephone wire.

36. according to the telephone adapter of claim 32, wherein:

This calling indicating device comprises a ring tone generator, is used to generate the indication tone that the calling that an outside enters appears in indication, and

At least two each be coupling in via separately adapter during interior lines between the extension unit on the telephone wire connect, the enabling signal that any one generated in this corresponding control unit response starting drive separately respectively, switching device is separately switched to primary importance, so that described at least two extension unit direct currents are connected on the telephone wire.

37. telephone adapter according to claim 32, wherein during an outside line between one the first INCOM intercom person on an external call person and first extension with first adapter is connected, the control unit that is coupling on first adapter responds an enabling signal that starting drive generated that is coupling on second adapter, generate a request signal, indicate one second INCOM intercom person to require to use telephone wire to the first INCOM intercom person.

38. telephone adapter according to claim 37, the control unit that wherein is coupling on second adapter responds the enabling signal that starting drive generated that is coupling on first adapter, and the switching device that is coupling on second adapter is switched to primary importance.

39. according to the telephone adapter of claim 37, wherein:

The control unit that is coupling on second adapter comprises a timing device, is used for after generating described enabling signal generating a mistake and finishing time signal through a preset time at interval, and

This control unit responds this and has crossed time signal, and switching device is switched to primary importance.

40., be used for one first extension unit is coupled to a telephone wire according to the telephone adapter of claim 33, be coupled with the second and the 3rd extension unit via separately first, second and the 3rd adapter at least on this telephone wire, wherein:

During interior lines between first and second INCOM intercom person separately on first and second adapter connect, the corresponding control unit that is coupling on first and second adapter respectively responds an enabling signal that starting drive generated that is coupling on the 3rd telephone adapter, to generate the warning signal of a correspondence, be used for indicating one the 3rd INCOM intercom person to require to use telephone wire to first and second INCOM intercom person.

41. telephone adapter according to claim 40, wherein be coupling in control unit response on the 3rd telephone adapter and be coupling in the enabling signal that one of corresponding starting drive on first and second telephone adapter generates, the switching device that is coupling on the 3rd telephone adapter is switched to the second place.

42. according to the telephone adapter of claim 40, wherein:

The control unit that is coupling on the 3rd telephone adapter is connected on the timing device, and this timing device is used for after generating described enabling signal generating a mistake and finishing time signal through a preset time at interval, and

This control unit responds this and has crossed time signal, and switching device is switched to the second place.

43. according to the telephone adapter of claim 31, wherein:

This switching device switches to one the 3rd position, and Dui Ying extension unit disconnects from telephone wire therein, and

This control unit responds total off hook signal and does not have the extension set off hook signal, and switching device is switched to the 3rd position.

44. according to the telephone adapter of claim 34, wherein:

45. according to the telephone adapter of claim 44, wherein said predetermined sign indicating number is that one zero deep-sited pulse is dashed the back with a dialing.

46. according to the telephone adapter of claim 33, wherein:

This calling indicating device is the equipment that can hear,

This call signal is encoded into the signal characteristic of hearing that generates needed telephone adapter in the adapter of each disconnection.

47. according to the telephone adapter of claim 30, wherein this control unit also is coupling in a responsive state index signal and transmits audibly on the loud speaker of a call.

48. according to the telephone adapter of claim 30, wherein have a remote-operated household electrical appliance coupling that responds an enabling signal and operate at least in the above, and

This control unit responds calling detection signal and generates this enabling signal.

49. according to the telephone adapter of claim 48, wherein these household electrical appliance are a remote-operated switch.

50., be a controller according to the telephone adapter of claim 28, be used to allow to connect and control connection all automatic answering equipments on telephone wire, this controller comprises:

A switching device, be connected between this controller and the telephone wire, and can between a primary importance and a second place, switch, this controller is directly to be connected on the telephone wire in primary importance, and be that AC coupled is on telephone wire at second place middle controller, so that blocking-up comes the described direct voltage of self-controller

A call signal detector total off-hook condition back operation, detects the device type signal characteristic of the desired automatic answering equipment on line that will be coupled, and generates a corresponding address signal,

A state indicating device, a kind of state of responding system and generate the condition indicative signal of a correspondence,

The call signal dispensing device responds this address signal, and the call signal of a correspondence is sent to the automatic answering equipment of described needs, and

A control unit is coupling on this state indicating device, call signal detector, call signal dispensing device and the switching device, and responds this condition indicative signal and address signal and operate this call signal dispensing device and switching device.

51. according to the telephone adapter of claim 50, wherein:

This state indicating device comprises a total offhooking detector, is used for detecting anyly being connected a total off-hook condition of the adapter on the telephone wire and generating a total off hook signal,

Wherein also comprise a ringing detector, respond an outside line bell signal and generate the ring detection signal of a correspondence, and

This control unit is coupling on this ringing detector, and responds this ring detection signal and count a bell signal cumulative number, so that generate a total off-hook condition after the pre-determined number bell signal.

52. according to the telephone adapter of claim 30, wherein this call signal detector is common dormancy, and responds a wake-up signal and operate.

53. according to the telephone adapter of claim 52, wherein:

This enabling signal comprises one zero deep-sited pulse dashes, and

This call signal detector is coupling in one zero deep-sited pulse on detector, is used for detecting zero deep-sited pulse dashing and to generate described wake-up signal.

54. according to the telephone adapter of claim 30, wherein in the described second place of switching device, telephone adapter separately is connected on the phone lead-out wire socket via a capacitive circuit.

55, according to the telephone adapter of claim 54, wherein said capacitive circuit also comprises a transformer.

56. a telephone system comprises:

, a telephone wire,

At least two extension unit that are coupling on this telephone wire, and

Be connected a corresponding switching device between each extension unit and the telephone wire, can between a primary importance and a second place, switch, this extension unit is coupling on the telephone wire in primary importance, and this extension unit then disconnects from telephone wire in the second place;

This system also comprises with respect to each extension unit:

A calling indicating device is coupling on this call signal detector and responds its calling detection signal that generates and generate one and call out index signal,

A state indicating device responds a kind of state of this system and generates the condition indicative signal of a correspondence, and

A control unit, be coupling in this state indicating device, call signal detector, call out on indicating device, call signal dispensing device and the switching device, respond this state indication, startup and calling detection signal and operate this calling indicating device, call signal dispensing device and switching device.

57. a telephone adapter comprises:

The circuit coupling device is used to be coupling in a telephone wire,

An extension set coupling device is used to be coupling in an extension unit, and

A switching device, be connected between this circuit coupling device and the extension set coupling device, and can between a primary importance and a second place, operate, this extension set coupling device is coupling on the circuit coupling device in primary importance, and this extension unit then disconnects from telephone wire in the second place.

58. according to the adapter of claim 30, with a telephone plant one.