JPS6343957B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention connects a plurality of telephone devices such as key telephone devices or exchanges using inter-device links and inter-device data lines and controls them so that they can be regarded as one device with a large line capacity. It is related to the method.

In conventional key telephone equipment and exchanges, there was a method of connecting multiple devices and using a dedicated line to increase the apparent capacity, but with this method, the devices could only be connected and disconnected and could not be considered as a single device. Therefore, in order to increase the capacity and achieve the same functionality as a smaller capacity device, it was necessary to replace it with another device with a larger capacity.

In order to eliminate these drawbacks, the present invention provides an independent inter-equipment link including a communication link and a control information line between the apparatuses, and a device on the calling side of a telephone call via the inter-equipment link receives the telephone call. control and make the called party's device subordinate to the calling party's device,
This makes it possible to provide an inter-telephone device connection control system that has the same function as the function of a call within a single device with respect to the telephone call.

The present invention will be explained in detail below with reference to the drawings.

Figure 1 is a configuration diagram of device connections, and shows 1, 2, 3
4, 5, and 6 are telephones, and 7 is a control information line that transmits control information between the central devices 1, 2, and 3, and is configured in a network or bus format. Ru. Reference numeral 8 denotes a communication link between the central units 1, 2, and 3, which is composed of a space-division type communication link or a time-division type communication link. The control information line 7 and the inter-device communication link 8 constitute an inter-device link.

An outline of the present invention will be explained based on FIG.
When a call is made by dialing from the telephone set 4 of the central unit 1 to call the telephone set 5 of the central unit 2, the call is made through the inter-device communication link 8, but the central unit 1 on the caller side is the master for this call. The central device 2 on the called party side becomes the slave side, and the master central device 1 controls all sequences related to this call, and sends control information through the control line 7 to the slave central device 2 as necessary. send. The slave-side central device 2 does not perform any sequence control regarding this call, but merely sends information regarding this call that occurred within its own device to the master-side central device 1 through the control information line 7. By passing the information sent through the control information line 7 to the telephone 5 of the own device 2, even though the telephones 4 and 5 belong to different central devices 1 or 2, It provides the same control as if it belonged to one single central unit.

FIG. 2 shows an embodiment of the call links in the button telephone device of the present invention, in which 1 and 2 are the central unit, 11, 12, 51, and 52 are central office lines, and 13 and 1 are central units, respectively.
4, 53, 54 are station arrival detection circuits (IR), 15, 1
6, 55, 56 are hold relay contacts, 17, 18,
57, 58 are sound sources on hold (MOH), 20, 21,
60, 61 are button telephones (KT), 22 to 27,
62-67 are cross point switches, 30-3
5, 70-75 are inter-device link switches; 40;
80 is an extension circuit, 41 and 81 are extension supply current switches, and 90 and 91 are inter-device communication links.

The operation of communication between devices according to the present invention will be explained based on FIG. First, when transferring the telephone line 11 to the telephone set 60 of the central apparatus 2 while the telephone line 11 of the central unit 1 and telephone 20 are talking, first switch the hold relay contact 15 of the central unit 11 to the hold sound source 17 side. Hold. The telephone 20 calls the telephone 60 of the central unit 2 via the control information line 7 in FIG. 1, and when the telephone 60 answers, the telephone 2
0 is [Crosspoint switch 26 → Inter-device link switch 34 → Inter-device communication link 90 → Inter-device link switch 74 → Crosspoint switch 6
6] to make a call to the telephone 60. At this time, the extension supply current switch 41 is closed, and the communication current between the telephone 20 and the telephone 60 is supplied from the extension circuit 40. When the telephone 20 is turned on, all call routes within the central device 1 are disconnected, the hold relay contact 17 is restored to the link side, and the office line 11 is connected to the [hold relay contact 15 → inter-device link switch 30 → device] Interlink 90 → Interdevice link switch 74 → Cross point 66]
A conversation is established with the telephone 60 via the route . At this time, the communication current for the telephone 60 is supplied from the central office line 11, and the extension line supply current switch 81 is open.

FIG. 3 is a diagram showing the concept of the control method of the present invention,
1 and 2 are central units, 110 and 120 are sequence control circuits, and 111, 112, 121, 1
22 is a changeover switch, 113 and 123 are telephones,
130 is a control information line.

The concept of the control method of the present invention will be explained based on FIG. In FIG. 3, the telephone 113 is the calling side, and the telephone 123 is the called side.As mentioned above, regarding this call, the central device 1 is the master side, the central device 2 is the slave side, and the changeover switch 111,
112, 121, and 122 are on the solid line side.
At this time, the information of the telephone 123 is [switch 12
2→switch 121→control information line 130→switch 112→sequence control circuit 110], and the sequence control circuit 120 of central device 2 is not concerned with the information from telephone 123. First, the information from the sequence control circuit 110 of the central device 1 is transmitted to the telephone 123 by a route opposite to the above-mentioned route, and the sequence control circuit 120 of the central device 2 is not concerned with the control of the telephone 123. In other words, the slave-side central device 2 merely functions as a relay for transmitting and receiving control information for the telephone 123, and the master-side central device 1 controls the telephones 113 and 123.

FIG. 4 shows an embodiment of a button telephone device using an inter-device connection control system according to the present invention. 1,
2 are central devices, 200, 201,
300, 301 are button telephones, 220, 320
is a subscriber circuit, 221, 321 is a receiving circuit, 22
2, 322 is a transmitting circuit; 223, 323 is a switching circuit consisting of gates, etc.; 224, 324 is an inter-device circuit consisting of gates, flip-flops, etc.; 225, 325 is a mode register consisting of flip-flops, registers, etc. , 227, 32
7 is a link control circuit composed of gates, flip-flops, etc.; 228, 328 are link circuits composed of thyristors, relays, etc.; 229, 329
is an extension circuit, 230 and 330 are translators composed of ROM, 231 and 331 are office line circuits,
232, 332 are timing signal generation circuits, 24
0, 241, 340, 341 are the data lines of the button telephone, 242, 243, 342, 343 are the talk lines of the button telephone, 244, 245, 344, 3
45 is a central office line, 250 and 350 are a subscriber circuit 220 or 320 and a switching circuit 223 or 323, respectively.
The data buses 251 and 351 are the output lines of the receiving circuit 221 or 321, respectively, and 252 and 3
52 is an input line of the transmitting circuit 222 or 322, respectively, 254, 354 is a data bus between the switching circuit 223 or 323, the extension circuit 229 or 329, and the office line circuit 231 or 331, respectively;
5 and 355 are switching circuits 223 and 323, respectively.
The data buses 257 and 357 between the subscriber circuit 220 and the inter-device circuit 224 or 324 respectively
or 320, the control line for the link control circuit 227 or 327, 258, 358, the control line for the link control circuit 227 or 327 of the inter-device circuit 224 or 324, respectively, 259, 359, the link circuit 228 of the link control circuit 227 or 327, respectively. or drive line for 328, 260,3
60 is a part of the extension link, 262 and 362 are parts of the central office line link, 261 and 361 are data buses between the translator 230 or 330 and the extension circuit 229 or 329, respectively, and 400 and 401 are data lines between devices. , 410, 411 are communication links between devices.

The operation of the embodiment shown in FIG. 4 will be explained. The switching circuits 223 and 323 respectively correspond to the switching switches 111, 112 and 121, 122 in FIG.
The above-mentioned master and slave switching is performed according to the contents of , and the other circuits correspond to the sequence control circuits 110 and 120 in FIG.

First, the independent operations of the central devices 1 and 2 will be described. Since the independent operations of the central devices 1 and 2 are exactly the same, only the central device 1 will be described.

Button telephones 200 and 201 and central unit 1
transmits and receives lamp information, key information, and switch information through the data lines 240 and 241 according to the time allocation shown in FIG. Controls the central office line or extension line regarding the timing. For example, when a call is received on the office line 244 (the office line in FIG. 5), the office line circuit 231 sends a "ringing" signal at timing T1 [data bus 254 → switching circuit 223 → data bus 250]
The subscriber circuit 220 generates incoming lamp information (office line lamp) at timing T1, generates a paging signal at timing T12, and sends it to the subscriber circuit 220 via the data lines 240 and 24.
1 to telephones 200 and 201, and to telephones 200 and 201, a ringing indication is outputted to the office line lamp and a ringing tone is outputted. Here, when the telephone 200 goes off-hook and presses the office line key, this key press information is sent from the telephone 200 at timing T33 via the route [data line 240 → subscriber circuit 220 → control line 257] as "telephone connected". It is sent to the link control circuit 227 as a.

The link control circuit 227 is a station line (station line 244) output from the timing pulse generation circuit 232.
of the telephone line 242 and central office line 244 in the link circuit 228 determined by the line number (LNO) of The cross point switch is driven through the drive line 259, and the telephone 200 and the office line 244 are placed in a communication state (a office line call).

Also, if the hold key of the telephone 200 is pressed in this state, this press information is transmitted to the subscriber circuit 220 through the data line 240 at timing T43 (T _HK ).
The subscriber circuit 220 sends the signal to the station line 244 as a "hold" signal at timing T33 [data bus 250 → switching circuit 223 → data bus 254]
The station line circuit 231 takes in this "hold" signal at timing T33 and operates the hold circuit of the office line 244 to hold the office line 244 (station line hold).

Next, the operation of connection between devices will be explained.

First, the telephone 200 of the central device 1 is connected to the central device 2.
A case where a telephone 300 is called and a conversation is made (an inter-device extension conversation) will be described.

When the telephone 200 presses the extension key, this press information is sent from the telephone 200 to the link control circuit 227 as "telephone connected" information at the timing T41 via the route [data line 240 → subscriber circuit 220 → control line 257]. It will be done. The link control circuit 227 receives the extension line number (LNO) output from the timing signal generation circuit 232 and the control line 2.
57 from the subscriber circuit 220;
Telephone 200 is connected to an extension. At this time, the extension circuit 229 sends a dial tone from the OR (outgoing register) therein to the telephone 200 on the telephone line 242.
However, when the number of the telephone 300 is dialed from the telephone 200 using the pushbutton dial, this dial is sent to the telephone line 24 in the form of an MF signal.
2, sent to the extension circuit 229 through the extension link 260, received at the OR in the extension circuit 229,
When OR receives the specified number of digits, it operates the translator 230 at timing T41. Since the received dialed number is the extension number of another device, the translator 230 outputs to the extension circuit 229 the accommodation position number corresponding to the extension number and the “MENO” signal indicating that the telephone is of another device. The extension circuit 229 sends the "ME connection request" signal by the "MENO" signal [data bus 254 → switching circuit 223 → input line 252 → transmission circuit 222 →
It is sent to the inter-device circuit 324 of the central device 2 via the inter-device data line 401→reception circuit 321→switching circuit 323→inter-device circuit 324]. Now, if the inter-device call link 410 is empty and the extension (line number 10) of the central device 2 is empty, the inter-device circuit 324
is the inter-device communication link 41 of the mode register 325
Extension line number “10” to the address corresponding to 0
and the "slave" flag, and the confirmation signal (sending side) "ACK (S)" [switching circuit 323→
The receiving circuit 22 of the central device 1 is connected to the receiving circuit 22 of the central device 1 via the route of transmitting circuit 322 → inter-device data line 400 → receiving circuit 231].
Send to 1. The receiving circuit 221 receives this “ACK(S)”
is changed into an acknowledgment signal (receiving side) "ACK (R)" and sent to the inter-device circuit 224 through the switching circuit 223. Based on this "ACK(R)", the inter-device circuit 224 sets the line number "9" of the extension used by the telephone 200 in the mode register 225 of the inter-device communication link 410.
and the "master" flag, and sends the cross point drive information ("MELI connected" signal) of the inter-device communication link 410 to the link control circuit 227 at the timing of the extension line, and the link control circuit 227
is the link circuit 22 of the link 410 between the extension and the device.
8 inter-device link switches are driven through the drive line 259. With the above operation, the mode register 225 corresponding to the inter-device communication link 410 of the central device 1
The line number “9” of the extension of the central unit 1 and the “master” flag are set in the mode register 325 corresponding to the inter-device link 410 of the central unit 2.
The extension line number "10" of the central unit 2 and the "slave" flag are set.

The inter-device circuits 224 and 324 constantly compare the line number output from the timing signal generation circuit 232 or 332 with the line number set in the mode register 225 or 325, and when they match, the line number is set in the mode register 225 or 325. A state identification signal indicating whether this line is a "master" or "slave" is output to the switching circuit 223 or 323 according to the flag. In this case, since the line number "9" and the "master" flag are set in the mode register 225 corresponding to the inter-device call link 410 of the central device 1, the receiving circuit 221 receives the inter-device call of the central device 2. The switching circuit 223 switches information such as the telephone switch and hold key of the telephone connected to the link 410 at the timing of line number "9" (T41)
It is output to the data bus 254 and taken in by the extension circuit 229. Also, from the extension circuit 229 to the data bus 2
The switching circuit 223 sends the lamp information etc. related to the extension line outputted to the input line 54 to the subscriber circuit 220 through the data bus 250, and also sends it to the input line 2 of the transmitting circuit 222.
52 to the transmitting circuit 222.

On the other hand, since the line number "10" and the "slave" flag are set in the mode register 325 corresponding to the inter-device communication link 410 of the central unit 2, the circuit number "10" is set through the subscriber circuit 320.
The switching circuit 323 does not send the line key information of the extension and information on the switch, hold key, etc. of the telephone connected to the extension sent at the timing (T42) to the extension circuit 329 but to the transmission circuit 322. The transmitting circuit 322 sends the signal to the receiving circuit 221 of the central device 1. Further, the switching circuit 32 transmits lamp information, etc. regarding the extension of the central device 2 connected to the inter-device data line 401 received by the receiving circuit 321.
3 connects directly to subscriber circuit 32 through data bus 350.
Send to 0. Therefore, in the above operating state, a call regarding the inter-device communication link 410 is controlled by the central office circuit 229 of the calling party's central equipment 1, and by the central office circuit 229 of the called party. 2 extension circuit or office line circuit (in this case, extension circuit 329)
is not involved in the control, and the subscriber circuit 320 is controlled by the line circuit of the central unit 1.

As a result of the above, the central devices 1 and 2 become master and slave states, and after transmitting and receiving the above-mentioned "ACK(S)" and "ACK(R)" signals, the translator 230 of the central device 1 sends a message to the telephone 30.
The accommodation position number 0 is output by the extension circuit 229 together with the individual call information to the data bus 254 at timing T41, and the information on this data bus 254 is transmitted through [switching circuit 223 → transmitting circuit 222 → inter-device data line 401 → receiving circuit 321 → switching circuit 323
→ subscriber circuit 320], and the subscriber circuit 320 sends a calling signal to the telephone 300 via the data line 340 at timing T12, and the telephone 300 enters the calling state. Also, at this time, if the telephone 300 goes off-hook and presses the extension line key, the information will be transmitted from the telephone 300 to T.
42 through the data line 340 by the subscriber circuit 320 as "line capture" information [data bus 350 → switching circuit 323 → transmitting circuit 322
→ Inter-device data line 400 → Receiving circuit 221 → Switching circuit 223 → Data bus 254 → Extension circuit 22
9] route, and the extension circuit 229 changes from the calling state to the talking state. This state is also transmitted to the subscriber circuit 320 of the central equipment 2 via the above-mentioned route, and the telephones 200 and 300 are connected to the telephone line 24.
2→link of extension of link circuit 228→interdevice call link 410→link of extension of link circuit 328→talk line 342]. Also, according to the above explanation, the inter-device communication link 41
It can be seen that the holding of an inter-device extension call via the central device 1 is performed in substantially the same manner as the holding in the central device 1 described above. However, in this case, telephone 20
Even if 0 or 300 presses the hold key, the hold circuit of the extension circuit 229 of the central unit 1 operates as the hold circuit, and the hold tone is transmitted from the extension circuit 229 to the telephone 30.
0 or 200.

Next, a case where the office line 244 of the central device 1 is transferred to the telephone 300 of the central device 2 (inter-device line transfer) will be described.

First, the subscriber circuit 220 stores, for each telephone, the number of the line that was last put on hold by that telephone. In the above explanation of the central office line hold, the central office line 2 is connected to the part of the subscriber circuit 220 corresponding to the telephone 200.
44 line number "1" is stored.

If the telephone 200 is currently talking to the central office line 244 and transfers the central office line 244 to the telephone 300,
The station line 244 is put on hold by performing the above-mentioned station line hold operation. Next, by operating the inter-device extension connection described above, telephone 200 uses the extension to communicate with telephone 300 through inter-device communication link 410. Next, phone 2
00 goes on-hook, the subscriber circuit 220 sends the previously stored hold line number "1" and the "ME transfer" signal to the extension line at timing T41 [data bus 250 → switching circuit 223 → inter-device circuit 224]
The inter-device circuit 224 changes the line number of the mode register 225 corresponding to the inter-device communication link 410 from "9" to "1".
Change to After this, the subscriber circuit 3 of the central unit 2
"Busy" information from 20 [data bus 350 →
It is sent to the office line circuit 231 via the following route: switching circuit 323 → transmission circuit 322 → inter-device data line 400 → reception circuit 221 → switching circuit 223 → data bus 254 → office line circuit 231], and the office line circuit 231 enters the hold state. unlock. At this time, the subscriber circuit 220 of the telephone 200 informs the link control circuit 227 that "the telephone is connected" at the extension timing T41.
Since the signal transmission is stopped, the telephone 200 is disconnected from the extension link, and the timing T33 of the central office line is reached.
Since the inter-device circuit 224 outputs drive information (“MEL1 connected”) for the inter-device link switch of the link circuit 228 that connects the office line 244 and the inter-device link 410,
0 is connected. On the other hand, since the central device 2 maintains its previous state during this time, the telephone 30 ends up
0 is [office line 244 → office line circuit 231 → office line link 262 → link circuit 228 → inter-device communication link 4
10→link of extension of link circuit 328→talk line 342], a call is made to the office line 244, and the office line transmission between the devices is completed. In this state, the telephone 300 of the central device 2 is operated in the same manner as described above.
can hold the central office line 244 of the central unit 1.

Next, the details of each circuit in FIG. 4 will be explained.

FIG. 6 is a block diagram showing a specific example of the telephone 200 shown in FIG. In the figure, 240 is a data line, 24
2-1 and 242-2 are the communication lines 242 and 4 in FIG.
00 is a line receiver, 401 is a line driver, 402 is a shift register, 403 is a latch register, 404 is an RS flip-flop, 405,
406 and 409 are AND gates, 407 is a counter, 408 is a JK flip-flop, 410 is a multiplexer, 411 and 412 are non-lock line keys and hold keys, 413 is a switch, 414 and 415 are resistors, and 416 and 417 are key switches. Light emitting diode, 418 is a ringing sound source, 419 is an analog switch, 420 is a speaker, 421 is a frequency divider, 422 is a clock signal generator, 423 is a communication circuit network, 424 is an MF
(multi-frequency) dial. Note that +V in the figure is a power supply.

The telephone 200 sends and receives data to and from the central unit 1 according to the timing allocation shown in FIG. The central device 1 and the telephone set 200 are synchronized by a method of starting (start-stop synchronization method). Specifically, in FIG. 6, when the RS flip-flop 404 is reset, its output causes the counter 407 and the JK flip-flop 40 to be reset.
8 and the frequency divider 421 have been reset (waiting for a start signal). In this state, when the first pulse (start signal at timing T0) is sent from the central device 1 through the data line 240,
This pulse passes through line receiver 400 and RS
Flip-flop 404 is set and counter 4
07, the reset of the JK flip-flop 408 is canceled, and the reset of the frequency divider 421 is also canceled, so the frequency divider 421 is activated by the clock signal generator 4.
The output of 22 is frequency-divided and a clock pulse CL matched to the transmission timing is output. This clock pulse CL causes the shift register 402 to switch to the data line 2.
Data sent from the central device 1 on the line receiver 400 is taken in through the line receiver 400. counter 4
07 outputs a carry when it counts a certain number of clock pulses CL, and flip-flop 408
Set. When flip-flop 408 is set, AND gate 405 opens and the contents of shift register 402 are transferred to latch register 403 on clock pulse CL. Also, at the same time
Since the AND gate 409 opens, the counter 40
7 until the next carry is output, information on line keys 411 to 413, etc., switch switches, etc. corresponding to the value of the counter 407 output from the multiplexer 410 is passed through the AND gate 409 and the line driver 401 to the data line 240. Output. At this time, since the AND gate 406 is also opened by the output of the flip-flop 408, when the counter 407 outputs a carry again, the flip-flop 404 is reset, and the output of the flip-flop 404 causes the counter 40 to open.
7. The flip-flop 408 and frequency divider 421 are reset and enter a state of waiting for the start signal from the central unit 1 described above.

FIG. 7 is a detailed diagram of the receiving section of the subscriber circuit 220 in FIG. 4 corresponding to the telephone set 200. In the figure, 240 is a data line between the phone 200, 450 is a line receiver, and 451 and 463 are
OR gate, 452, 455, 464, 470,
471 is an AND gate, 453 is a shift register,
454, 460, 461, 462 are D flip-flops, 464 is a delay circuit consisting of one shot, 472 is a gate circuit consisting of AND gate, 480 is an inverter, 481 is NAND gate, 482 is a register, 483 is a coincidence circuit, 4
90,491,492,493 are buffers. Note that T _KEY , T _HOOK , and T _HK in the figure are timing signals shown in FIG. 5 and are supplied from the timing generation circuit 232 in FIG. 4. In addition, CL and LNO (line numbers) are each provided by a timing signal generation circuit 232.
The clock signal and line number supplied from

The operation of the circuit example shown in FIG. 7 will be explained. When the AND gate 452 is opened by the T _KEY signal, the output of the OR gate 451 is sequentially shifted and set in the shift register 453 and flip-flop 454 by the clock pulse CL. Here, the key information of the line key is sent from the telephone 200 to the data line 2.
40, the line receiver 45
0 and the shift register 45 through the OR gate 451
Key information is set in the keys 3 and flip-flop 454 in the key order shown in FIG. Since the total number of bits in the shift register 453 and flip-flop 454 is made to match the number of line keys, the output of the flip-flop 454 is the information one cycle before the key information currently being sent through the data line 240. , flipflop 4
Since the output of 54 is the input of the OR gate 451, even if there is no output on the data line 240 at the current timing, if there was an output before, that output will be held by the shift register 453 and flip-flop 454. Become. This is an operation for equivalently continuing the key press state even if the key press information does not come continuously because the line key or the like is a non-lock key.

The switch information of the telephone 200 obtained by the T _HOOK signal through the data line 240 and the line receiver 450 is set in a flip-flop 460, and the flip-flop 462 updates its contents at the timing of T _HOOK with the output of the flip-flop 460. Therefore, flip-flops 460 and 462 remain set while telephone 200 is off-hook. When on-hook, flip-flops 460 and 462 are in the reset state, so the output of flip-flop 462 passes through OR gate 463 and resets register 453 and flip-flop 454.

When the flip-flop 460 is set, the shift register 453 and the flip-flop 454 hold the line key information of the telephone 200 as described above, but if a line key is pressed during off-hook, for example, the timing of that line will be changed. The signal is outputted from the flip-flop 454 and sent to the switching circuit 223 in FIG. 4 as "busy (K)" information through the buffer 490. Furthermore, at the moment when a line key is pressed during off-hook, the flip-flop 454 is in a reset state at the timing of that line, and the output of the line receiver 450 is "1", so an output is obtained at the AND gate 455.
It is sent to the switching circuit 223 through the buffer 491 as "line capture (K)" information. At the next timing, the flip-flop 454 at that line timing is set, so the AND gate 454 is set.
55 has no output. Therefore, "line capture (K)"
The signal is output only once when the line key is pressed in the off-hook state.

The held key information of telephone 200 obtained by the _THK signal through data line 240 and through line receiver 450 is set in flip-flop 461, and its output is ANDed with the output of flip-flop 454 by AND gate 470, so that it is "busy". At the timing of the line in the state (currently in use), it is sent to the switching circuit 223 as a "hold (K)" signal through the buffer 492.
Also, at the same timing, a line number (LNO) is set in the register 482 by the output of the AND gate 470, and is stored as the pending line number. A match circuit 483 constantly compares the output of this register 482 and the line number (LNO), and when they match, outputs a match output. The output of AND gate 470 is also delayed by delay circuit 464 and passes through OR gate 463 to reset register 453 and flip-flop 454. As mentioned above, the flip-flop 462 is the flip-flop 4 of the previous cycle.
60, so when the telephone 200 goes from off-hook to on-hook,
The output of the AND gate 464 is "1" for one cycle. Therefore, when telephone 200 puts the central office line on hold, for example, and goes on-hook while talking with another telephone using an extension, an output is output to AND gate 464, but this output is output from flip-flop 454 by AND gate 471. It is ANDed with a certain "busy" signal and sent to the switching circuit 223 through the buffer 493 as an "ME transfer (K)" signal. Also, at the same time, the gate circuit 472 is opened by the output of the AND gate 471, and the line number of the office line stored in the register 482 becomes "hold line number".
(K)" and is sent to the switching circuit 223.

Note that when the "on hold (K)" signal sent from the switching circuit 223 is "0" (not on hold), the output of the inverter 480 becomes "1", so the register 482 is connected to this output and the above. matching circuit 4
When 83 matching outputs are issued simultaneously,
It is reset by the output of NAND gate 481.

FIG. 8 is a detailed diagram of the transmitting section of the subscriber circuit 220 in FIG. 4 corresponding to the telephone set 200. In the figure, 240 is a data line between the phone 200, 500 is a line driver, and 501 and 507 are
OR gate, 502-505, and 508 are AND
The gate 506 is a D flip-flop.

The operation of the circuit example shown in FIG. 8 will be explained. “In use (L)” and “on hold (L)” output from the switching circuit 223 in FIG.
According to 4, “Calling (L)” and “Individual calling (L)”
passes through OR gate 507 and then AND gate 502
As a result, the lamp blinking interval signal “busy lamp” output from the timing generation circuit 232
INT”, “Hold lamp INT”, “Incoming call lamp INT”
is ANDed and sent to OR gate 501. In addition, the "individual calling (L)" and "calling (L)" signals sent from the switching circuit 223 are sent to the flip-flop 5 by a clock pulse gated by the timing signal T32 at the AND gate 508.
06, and its output and the ringing interval signal "ringing" from the timing generation circuit 232.
INT'' and the call signal timing T12 output from the timing signal generation circuit 232 are ANDed by the AND gate 505 and the OR gate 501
sent to. Additionally, the timing signal generation circuit 232
The start signal timing T0 output from
It is sent to OR gate 501. OR gate 501
The output of
40, and the start signal, lamp information for each line, and calling signal are sent to the telephone set 200 according to the timing assignment shown in FIG.

FIG. 9 is a detailed diagram of the portion of the extension circuit 229 in FIG. 4 relating only to the extension line and the translator 230.

In FIG. 9, 230 is a translator, and all other circuits are extension circuits. In the figure,
260-1 and 260-2 are extension links and are the fourth
This is a portion of extension link 260 in the figure. 510,
511 is a resistor, 512 is a power supply, 513 is an oscillation register (OR), 514 is a gate circuit, 516, 5
22 to 526, 529, 535 are AND gates,
518 is an OR gate, 519 is a JK flip-flop, 520 is an analog switch, 521 is a hold sound source, 517, 527, 528 is an inverter, 53
0,531 is a D flip-flop, 540 is
ROM, 532 is a relay driver, 533 is a relay, and 534 is a contact of the relay 533.

The operation of the circuit example shown in FIG. 9 will be explained. For example, when the telephone 200 presses the extension key as described above, this press information is transferred to the data line 240 → subscriber circuit 220 → data bus 250 → switching circuit 223 → data bus in FIG. 254] route, the switching circuit 223 sends it as "Line Capture (L)" information to the extension circuit 229 of the extension shown in FIG. This “Line Capture (L)” information is gated by an AND gate 516 with a timing signal of T41 and sent to a transmission register 513. The originating register 513 uses this signal to send a dial tone to the extension links 260-1 and 260-2, and starts accumulating MF dials. When a predetermined number of digits have been accumulated, an accumulation completion signal is sent to the gate circuit 514, and the gate circuit 514 sends the dial number accumulated by the transmission register 513 to the translator 230 at timing T41. Translator 2
30 outputs an accommodation position number corresponding to the dialed number and a "MENO" signal indicating whether the dialed number is a number in the own device or a number in another device by the ROM 540. When the "MENO" signal is "1", it is a number in another device. At this time, when the "MELINK empty (L)" signal output from the switching circuit 223, which indicates that the inter-device data link 401 is empty, is "1", the AND gate 522 causes the "ME connection request" at the timing T41. L)” signal is output to the switching circuit 223. Also, the accumulation end signal output from the transmission register 513 is outputted from the AND gate 523 to T.
9 is ANDed with the timing signal of
(L)" signal is sent to the switching circuit 223.

Furthermore, as described above, when telephone 200 in FIG. When either presses the hold key, the switching circuit 223
A “Hold (L)” signal is sent to the extension circuit 229 through the data bus 254 at the timing T41 of the extension line, and this signal is sent to the flip-flop 51 by the clock signal CL41 at the timing T41.
It is set to 9. The analog switch 520 is opened by the output of the flip-flop 519, and the hold music from the hold sound source 521 is transferred to the extension links 260-1 and 260-2.
It is output to 60-2. Furthermore, the output of the flip-flop 519 is gated by the AND gate 524 at timing T9, and is sent to the switching circuit 223 as a "pending (L)" signal.

Also, when this inter-device call is on hold, the telephone 200 or 20 of the central device 1 in FIG.
1 or from the telephone 300 or 301 of the central equipment 2, the press information is transmitted through the subscriber circuit 220 of the central equipment 1 in the former case, and through the subscriber circuit 220 in the central equipment 1 in the latter case. subscriber circuit 320→switching circuit 323→transmission circuit 3
22 → data line 400 → receiving circuit 2 of central device 1
21] to the switching circuit 223 of the central unit 1, and the switching circuit 223 sends it as a "line capture (L)" signal to the extension circuit 229 at timing T41, but this signal is sent to the extension circuit 229 through the AND gate in FIG. 516
is gated at the timing of T41, passes through OR gate 518, and the clock signal is output by this output.
The flip-flop 519 is reset by CL41 and the pending state is released.

Furthermore, when all the telephones connected to this extension (including the telephone of the central unit 2 which is connected through this extension and the inter-device link in the case of an inter-device connection call) go into an on-hook state, a signal is sent from the switching circuit 223. The "busy (L)" signal outputted at the timing of T41 becomes "0", and this signal passes through the inverter 527 in FIG.
The flip-flop 519 is reset by CL41 and the pending state is released.

Also, when there is one or more telephones connected to this extension, the "busy (L)" signal output from the switching circuit 223 at the timing T41 becomes "1", and at the timing T41, the "busy (L)" signal output from the switching circuit 223 as shown in FIG. Flip-flop 530 is set when flip-flop 519 is reset (not on hold) and inverter 52 is set.
When there is no output in 6 (not being called), T
At timing 9, the AND gate 525 outputs an "in use (L)" signal to the data bus 254 and sends it to the switching circuit 223. Also, inverter 517
When the output of flip-flop 519 is "1" (when not being called), flip-flop 519 has been reset (when not on hold), and flip-flop 5
30 is reset (not busy), the AND gate 526 outputs a "line empty (L)" signal to the data bus 254 at timing T41.

Further, the "slave" signal from the switching circuit 223 is inverted by an inverter 528, and this output and the "busy (L)" signal from the switching circuit 223 are gated by an AND gate 529.
When an output is generated, flip-flop 531 is set, and the output passes through relay driver 532 and drives relay 533 to close relay contact 534 and supply current to extension link 260. After all, this means that when there is one or more telephones connected to the extension circuit of the extension shown in Figure 9, and this extension circuit is in a state other than slave, it supplies the telephone current, but when it is in the slave state, it supplies the telephone current. It will not be supplied. In the latter case, communication current is supplied from the extension circuit of another central device on the master side to the extension link in the slave state through the inter-device link.

Note that the clock signal CL41 in the timing signal T41 supplied to the flip-flops 530 and 531 in FIG. 9 is the clock signal CL outputted from the timing generation circuit 232 and the timing signal T4.
1 is gated with AND gate 535.

FIG. 10 is a detailed diagram of a portion of the station line circuit 231 in FIG. 4 relating only to the station line. In FIG. 10, 244-1, 244-2 are station line links 244, 262-1, 262-2 in FIG. 4 are station line links, which are part of the station line link 262 in FIG. 550 is a station arrival detection circuit for detecting an incoming call to the station line, 553 is a transformer, 554 is an analog switch, 555 is a hold sound source, 560 is a JK flip-flop used for a hold flag, 56
1 is a D flip-flop that serves as a busy flag, 5
62 is a relay driver, 563 is a holding relay, 5
64,571-574 are AND gates, 565 is an inverter, 551,552 is a holding relay 563
This is the point of contact.

The operation of the circuit example shown in FIG. 10 will be explained. Now, when there is an incoming call on the office lines 244-1 and 244-2, the station arrival detection circuit 550 operates and outputs a detection output, and this output is gated by the timing signal T1 of the office line by the AND gate 571, and the call is called. It is sent to the switching circuit 223 through the data bus 254 as a medium (L) signal.

Also, when the central office line 244 and the telephone 200 or 201 of the central device 1 are in use, or when the central office line 244
is in a call with the telephone 300 or 301 of the central unit 2 through the inter-device call link 410 or 411, and when the telephone which is talking to the central office line 244 presses the hold key, the press information in FIG. 4 is stored in the data of the telephone. In the former case, the route is [subscriber circuit 220 → switching circuit 223 → data bus 254 → office line circuit 231], and in the latter case, the route is [subscriber circuit 320 → switching circuit 323 →
Transmission circuit 322 → inter-device data line 401 → reception circuit 221 → switching circuit 223 → data bus 254 →
The signal is passed as a "hold (L)" signal to the office line circuit 231 of the office line I in FIG. 10 via the route of the office line circuit 231]. This "hold (L)" signal is set in flip-flop 560 by clock signal CL33 at timing T33. flip flop 560
The output passes through the relay driver 562 and drives the hold relay 563, so its contacts 551 and 55
2 is switched to the transformer 553 side and the central line 244-
1,244-2 is withheld. Also, at this time, the analog switch 554 is opened by the output of the flip-flop 560, and the output of the held sound source 555 is outputted to the central lines 244-1 and 244-2 through the transformer 553 and relay contacts 551 and 552.
Also, while in this hold state, press the line key for the central office line of the central unit 1 telephone, or press the central office line 2 line key.
44 is connected to, for example, an extension of the central unit 2 through an inter-device link, when the line key of the extension of the telephone of the central unit 2 is pressed, this key press information causes the switching circuit 223 to send a "busy" message as described above. (L)" signal becomes "1" and is sent to the central office line circuit 231 at timing T33, but this "busy (L)" signal is transmitted to the flip-flop 56 in FIG.
0, the flip-flop 560 is reset by the clock signal CL33 at the timing signal T33, and the pending state is released.

Also, when there is one or more telephones connected to this office line 244, the "busy (L)" signal at T33 output from the switching circuit 223 becomes "1",
Flip-flop 561 in FIG. 10 is set by clock signal CL33 at timing signal T33, but at this time flip-flop 560 is reset (not on hold) and when inverter 565 has an output (arrival detection When there is no output from the circuit 550), at the timing of T1
The AND gate 573 outputs an “in use (L)” signal to the switching circuit 223.

Further, when the output of inverter 565 is "1" (when not calling), when flip-flop 560 is reset (when not on hold), and when flip-flop 561 is reset (when not busy), AND gate 57
4, a "line empty (L)" signal is output to the data bus 254 at timing T33.

Note that the clock signal CL3 at the timing signal T33 supplied to the flip-flop in FIG.
3, the clock signal CL output from the timing signal generation circuit 232 and the timing signal T33 are
It is gated with an AND gate 564.

FIG. 11 is a detailed diagram of the inter-device circuit 224 and mode register 225 of the central device 1 in FIG.

In FIG. 11, 600 and 620 correspond to the inter-device communication links 410 and 411 in FIG. 4, and respectively control the inter-device communication links 410 and 411, and in FIG. This circuit is a common circuit within the inter-device circuit 224 in FIG. Further, in the control circuit 600, 602, 610, and 611 are parts related to the inter-device communication link 410 of the mode register 225 in FIG.

In FIG. 11, 601 is a multiplexer;
602 is a register, 603 is a matching circuit, 604,
607, 647, 650 are OR gates, 605,
606,608,612-615,642,64
3.646,649 is AND gate, 609 is
NAND gate, 610, 611 are JK flip-flops, 644, 645 are D flip-flops,
648 and 651 are encoders.

Next, the operation of the circuit example shown in FIG. 11 will be explained. 1st
By the AND gates 642 and 643 in Figure 1,
The clock signal CL output from the timing signal generation circuit 232 is output from the timing signal generation circuit 232.
The D flip-flops 644 and 6 are gated with the extension timing signal T41 and the extension timing signal T42 output from the D flip-flops 644 and 6, respectively.
45, the D flip-flops 644 and 645 have T41 and T42.
"Line empty (L)" of each extension from the extension circuit 229 sent through the switching circuit 223 at the timing of
The signal is set. AND gate 646 is D
Flip-flop 644 is reset (when extension is not empty) and D flip-flop 64
When 5 is set (when the extension is empty)
However, when the output of the D flip-flop 644 is "1", the encoder 648 outputs the extension line number "9", and when the output of the AND gate 646 is "1", the encoder 648 outputs the extension line number Output the number “10”. As a result, the encoder 648 outputs a smaller empty extension number.

Furthermore, when the "ACK(R)" signal on the data bus 255 is "1", the line number (LNO) from the timing signal generation circuit 232 is output from the multiplexer 601, and the line number (LNO) from the AND gate 649 ("ACK(R)" signal is "1"). (S)” signal) is “1”, the air extension number which is the output of the encoder 648 is
When the output of AND gate 606 is "1", the reserved line number (L) on data bus 255 is output.

A case in which the control circuit 600 performs master operation in the above operating state will be described.

Now, the telephone 200 is talking to the office line 244 (office line) of the central unit 1 in FIG. shall be. Here, if the inter-device communication link 410 is vacant, the extension circuit 229 of the central device 1 transmits the "ME connection request" signal at the timing T41 as described above [switching circuit 223 → transmitting circuit 222 → receiving circuit 3
21 → switching circuit 323 → inter-device circuit 324] is sent to the inter-device circuit 324 of the central device 2,
The inter-device circuit 324 checks the antenna of the central device 2, and if there is an antenna, sends an "ACK (S)" signal to the switching circuit 3.
23→transmission circuit 322→reception circuit 221], and the reception circuit 221 converts this "ACK (S)" signal into an "ACK (R)" signal and passes it through the switching circuit 223 to the inter-device circuit 224. send to
In the control circuit 600 of FIG. 11, the line number (LNO) is output to the multiplexer 601 by this "ACK (R)" signal, but the "ME connection request" signal is output and the "ACK (R)" signal is output. Since there is no time delay until the signal returns, multiplexer 601 outputs the line number (LNO) "9" of the extension used by telephone 200. Further, the JK flip-flop 610 is a flip-flop that stores whether the inter-device communication link 410 is idle or in use, and is reset when it is empty and set when it is in use. In this case, since the inter-device communication link 410 is empty, this
JK flip-flop 610 is reset, and its output outputs AND gates 605 and 6.
12 is open. Therefore, the above “ACK(R)”
The signal is [OR gate 604 → AND gate 605 →
AND gate 608 at the root of OR gate 607]
is input to the clock terminal of the register 602 after being gated by the clock signal CL from the timing signal generation circuit 232 by the AND gate 608.
Line number (LNO) of the extension output from 1
"9" is set. Also, at the same time, OR gate 6
The output of the JK flip-flop 610 is input to the J terminal of the JK flip-flop 610, and the "ACK (R)" signal is input to the J terminal of the JK flip-flop 611 through the AND gate 612. is set. The JK flip-flop 611 is a flip-flop that stores whether the inter-device communication link of the central device 1 is used in master or slave mode, and the set state is master and the reset state is slave. , in this case, it is set to master.

Further, the coincidence circuit 603 constantly compares the line number (LNO) outputted from the timing signal generation circuit 232 and the contents of the register 602, and when they match, outputs a coincidence output. Therefore, in this case, since the extension line number "9" is set in the register 602, the matching circuit 6 is activated at the timing of the extension line.
A coincidence output is output from 03, and this coincidence output is sent by the encoder 651 to the switching circuit 223 as an inter-device communication link number "MELNO (M)" at the timing of the extension. Also, in this case, since flip-flops 610 and 611 are set, the AND gate 614 is activated by the coincidence output.
A "MASTER" signal is sent to the switching circuit 223 at the timing of the extension. Further, the coincidence output is sent to the link control circuit 253 as a "MEL1 connected" signal at the timing of the extension, and the link control circuit 253 drives a switch that connects the extension link in the link circuit 228 and the inter-device communication link 410. Ru.

From then on, while the telephone 200 is using the extension to make an inter-device call, the control circuit 600 always sends the above-mentioned "MELNO (M)" at the timing of the extension.
“MASTER” and “MEL1 connected” are output.

Here, when the telephone 200 goes on-hook, the subscriber circuit 220 in FIG. The "ME transfer (L)" signal and the "held line number (L)" are sent to the inter-device circuit 224, but this "ME transfer (L)" signal is sent to the AND gate 60 in FIG.
6, and the “held line number (L)” is input to multiplexer 601. Since the line number "9" of the extension line was stored in the register 602, a match output was output from the match circuit 603 at the timing of the extension line, the AND gate 606 was opened, and the "ME transfer (L)" signal was ANDed. It is output to gate 606. According to the output of the AND gate 606, the output of the multiplexer 601 is the "held line number (L)".
is output, and the output of AND gate 606 is OR
The clock signal CL passes through gate 607 and is gated by AND gate 608, and is input to the clock terminal of register 602.
The above-mentioned ``hold line number (L)'' is set in .
In this case, the reserved line number is the station line number "1", and the contents of the register 602 are eventually changed from "9" to "1". Therefore, from now on, the coincidence circuit 603 outputs a coincidence output at the timing of the office line, and the control circuit 600 outputs the above-mentioned "MELNO (M)" and "MELNO (M)" at the timing of the office line until the office line becomes empty. "MASTER" and "MEL1 connected" are output.

Furthermore, since the AND gate 613 is opened when the coincidence output is output from the coincidence circuit 603,
When an output is sent to the AND gate 613, the "line empty (L)" signal from the switching circuit 223 is output to the register 6.
This is when the line number stored in register 602 becomes "1" at the timing of the line number stored in register 602, that is, when the line stored in register 602 becomes empty. Since it is input to the K terminal and NAND gate 609, it ends up in register 60.
JK when the line stored in 2 becomes empty
Flip-flops 610, 611 and register 602 are reset.

Next, a case where the control circuit 600 performs slave operation will be described.

Now, assume that the telephone 300 of the central device 2 in FIG. 4 dials the telephone 200 of the central device 1 using an extension. Here, assuming that the inter-device link 410 is free and the extension of the central device 1 is free, the "ME connection request (L)" signal from the extension circuit 329 of the central device 2 is sent at the timing of the extension of the central device 2. At T42, the "ME"
The connection request (R) signal is input to the AND gate 649 in FIG. Since the extension line of the central unit 1 is currently vacant, the flip-flop 644 is set as described above.
The output of 44 passes through the OR gate 647 and opens the AND gate 649, so the above-mentioned "ME connection request (R)"
The signal passes through the AND gate 649 and is sent to the switching circuit 223 as an "ACK (S)" signal. This "ACK(S)" signal is shown in FIG.
23→transmission circuit 222→reception circuit 321→switching circuit 323→interdevice circuit 324], the signal is converted into an "ACK(R)" signal and sent to the interdevice circuit 324 of the central device 2.

Also, in FIG. 11, the AND gate 64
As mentioned above, the output of the multiplexer 601 is sent to the encoder 64 by the output "ACK(S)" signal of the multiplexer 601.
Since the line number "9" of the extension coded 8 is output and the inter-device communication link 410 is empty, the flip-flop 610 has been reset, and this output opens the AND gate 605. The “ACK(S)” signal is [OR
Gate 604 → AND gate 605 → OR gate 6
07] route to the AND gate 608,
Since the clock signal CL is gated by the AND gate 608 and input to the clock terminal CL of the register 602, the multiplexer 60
The line number "9" of the extension line output from 1 is set. At the same time, the output of OR gate 607 is input to the J terminal of JK flip-flop 610, so JK flip-flop 610 is set by clock signal CL. Note that the JK flip-flop 611 remains reset.

As mentioned above, the coincidence output of the coincidence circuit 603 is output when the line number (LNO) from the timing signal generation circuit 232 and the output of the register 602 match, so in this case, the coincidence output is output at the timing of the extension line. This coincidence output is sent by the encoder 651 to the switching circuit 223 as the inter-device communication link number "MELNO (M)" at the timing of the extension. Also, since flip-flop 610 is set and flip-flop 611 is reset, the coincidence output
A "SLAVE" signal is sent from the AND gate 615 to the switching circuit 223 at the timing of the extension line.
Further, the coincidence output is sent to the link control circuit 25 as a "MEL1 connected" signal at the timing of the extension line.
3, and the link control circuit 253 connects the extension link in the link circuit and the inter-device call link 410.
The switch that connects is driven.

Hereinafter, in FIG. 4, the extension circuit 3 of the central device 2
From 29 [switching circuit 329 → transmitting circuit 322 → receiving circuit 221 → switching circuit 229 → inter-device circuit 22
4] route, the “line empty (L)” signal is input to the AND gate 613 in FIG. 11, and the register 602,
Until the flip-flops 610 and 611 are reset, the control circuit 600 always sends the above-mentioned "MELNO (M)", "SLAVE",
“MEL1 connected” signal is output.

FIG. 12 shows the switching circuits 223 and 323, the receiving circuits 221 and 321, the transmitting circuits 222 and 322, and the inter-device data line 400 in FIG.
and 401 are detailed diagrams.

In Figure 12, 700~703,800~
803 is a gate circuit composed of AND gates,
704, 705, 804, 805 are OR circuits composed of OR gates, 706, 806 are decoders, 707, 807 are inverters 710, 71
1,810,811 is a multiplexer, 712,
713, 812, 813 are registers, 714, 8
14 is a demultiplexer. Furthermore, transmitting circuit 2
22 and 322 are line drivers.

The operation of the circuit example shown in FIG. 12 will be explained. Registers 712 and 812 are inter-device communication links 41 in FIG.
0, registers 713 and 813 are associated with device-to-device communication link 411. Now, assume that the telephone 200 of the central device 1 uses an extension to dial the telephone 300 of the central device 2.

As mentioned above, the "ME connection request (L)" signal is output from the extension circuit 229 in FIG. 4 to the data bus 254, and this "ME connection request (L)" signal is input to the switching circuit 223 in FIG. [Transmission circuit 222→
"ME connection request (R)" via the switching circuit 323 via the route of the inter-device data line 401 → receiving circuit 321]
It is sent as a signal to the inter-device circuit 324 through the data bus 355. In the central device 2, if the extension is busy and the extension is free, the inter-device circuit 324 sends an “ACK” message to the data bus 355 as described above.
(S)" signal is input to the switching circuit 323, passes through the switching circuit 223 via the route of [transmission circuit 322 → inter-device data line 400 → reception circuit 221], and this "ACK (S)" signal is input to the switching circuit 323. R)" signal is sent to the inter-device circuit 224 through the data bus 255. After this, the mode register 225 of the central device 1 corresponding to the inter-device call link 410 is set to master, while the mode register 325 of the central device 2 is set to slave, and the "MESTER" signal is sent at the timing of the extension of the central device 1. , the "SLAVE" signal is output from each inter-device circuit 224 and 324 at the timing of the extension of the central device 2, as described above. Therefore, at the timing of the extension of the central unit 1, the data bus 255
Since the above "SLAVE" signal is "0", the "" signal output from the inverter 707 becomes "1", and at the timing of the extension of the central unit 2, the "SLAVE" signal on the data bus 355 becomes "1". ”, the “ ” signal output from the inverter 807 becomes “0”.

In this state, at the timing of the extension of the central device 1, the "MASTER" signal and the "" signal are both "1", so the gates 701, 702, and 703 are opened. Therefore, busy (K), line seize (K), hold (K) signals from subscriber circuit 220 on data bus 255
The signals are output to the data bus 254 as busy (L), line capture (L), and hold (L) signals to the extension circuit 229 via the route [gate 701→OR circuit 705]. “Ringing (L)”, “Holding (L)”, “In use” from the extension circuit 229 on the data bus 254
(L)" each signal is connected to the gate 703 and the OR circuit 70.
4 to the data bus 250 for the subscriber circuit 220 as "calling (K),""on hold (K)," or "in use (K)."
”
are output as each signal. At the same time, the extension circuit 229 on the data bus 254 sends information such as "accommodation position number (L),""calling(L),""on hold (L)," and "in use (L)."
” passes through the gate 702 [transmission circuit 222 →
Inter-device data line 401 → demultiplexer 81
4] route, the data terminal is input to the demultiplexer 814. At this time, the inter-device circuit 22
4 onto the data bus 255 at the timing of the extension of the central device 1.
Since the inter-device call link number "MELNO (M)" of 0 is input to the select terminal of the demultiplexer 814 through the route, the input signal of the data terminal of the demultiplexer 814 is input to the register 812.
It is output to the side and set in the register 812.
As a result, the register 812 contains information such as "accommodation position number (L)", "ringing (L)", "on hold (L)", and "in use (L)" from the extension circuit 220 of the central unit 1. Each information is set.

On the other hand, at the timing of the extension of the central device 2, the "SLAVE" signal on the data bus 355 is "1", and the device of the inter-device communication link 410 is sent from the inter-device circuit 324 onto the data bus 355. The inter-call link number "MELNO (M)" is output. The multiplexer 810 takes in the output of the register 812 based on the "MELNO" signal, and sends the output of the register 812 to the OR circuit 804 since the "SLAVE" signal is "1". Among the outputs of the OR circuit 804, the “accommodation position number (L)” signal is developed for each telephone by a decoder 806 and output to the data bus 350 as an “individual ringing (K)” signal. The output is directly output to the data bus 350, and indicates "Calling (K)" and "Pending".
(K)" and "In use (K)" signals from the subscriber circuit 32.
Sent to 0.

Also, as mentioned above, at the timing of the extension of the central unit 2, "SLAVE" on the data bus 355
Since the signal is "1" and the "MASTER" signal is "0", only the gate 800 is opened at the timing of the extension of the central device 2, and the other gates 801 and 80 are opened.
2,803 is closed. Therefore, the central unit 2 uses the data bus 3 at the timing of an extension line.
"Busy (K)" from subscriber circuit 320 on 50,
The “Line Seize (K)” and “Hold (K)” signals are [Gate 8
01→OR circuit 805→data bus 354], but instead passes through gate 800 and is sent to the demultiplexer via the route [transmission circuit 322→interdevice data line 400→demultiplexer 714]. 714 data terminal. At the same time, the inter-device communication link number "MELNO (M)" of the inter-device communication link 410, which is output from the inter-device circuit 324 onto the data bus 355 at the timing of the extension of the central device 2, is selected by the demultiplexer 714 through the above route. The input signal of the data terminal of the demultiplexer 714 is input to the register 712.
The signal is output to the side and set in the register 712.
As a result, the register 712 is set with information regarding the extension from the subscriber circuit 320 of the central unit 2, such as "busy (K)", "line capture (K)", and "hold (K)".

As mentioned above, at the timing of the extension of the central device 1, the "MASTER" signal on the data bus 255 is "1" and the inter-device communication link number of the inter-device communication link 410 is output as the "MELNO" signal, so the multiplexer 711 sends the output of register 712 to OR circuit 705. Also, OR circuit 70
5 also receives the information of the subscriber circuit 220 through the gate 701 as described above, so the OR
The output of the circuit 705 at the timing of the extension of the central equipment 1 includes "hold (L)" and "line capture (L)" regarding the extension of the subscriber circuit 220 of the central equipment 1 and the extension of the subscriber circuit 320 of the central equipment 2. )","busy
(L)'' are output and sent to the extension circuit 229 of the extension of the central device 1.

Above, we have described the case where the extension line is used as the master operation in the central unit 1, but the same applies to the case where the extension line or the office line is used. In this case, the description of the central units 1 and 2 in the above description is simply reversed.

Further, when the inter-device communication link 411 is used, the above information is set in registers 713 and 813 instead of the registers 712 and 812.

FIG. 13 is a detailed diagram of the link control circuit 227 and link circuit 228 of FIG. 4. In the figure, 91
6 to 923 are photocouplers including optically coupled thyristor drivers, 924 to 931 are relays including relay drivers, 900 to 915 are D flip-flops, 940 to 943 are AND gates, 94
5 is a decoder, 916-1, 916-2 to 923
-1 and 923-2 are optically coupled thyristors driven by photocouplers 916 to 923, respectively. or,
924-1,924-2 to 931-1,931-
2 are contacts of relays 924 to 931, respectively.

The operation of the circuit example shown in FIG. 13 will be explained. For example, when the telephone 200 in FIG. 4 is connected to the extension of the extension link 260 and the inter-device call link 410, the subscriber circuit 220 sends a message "Telephone connected (200)" to the telephone 200 at the extension timing T41. A signal is output to the control line 257, and a "MEL1 connected" signal is output from the inter-device circuit 224 to the control line 258 at timing T41 of the extension line. Therefore, when the line number (LNO) from the timing generation circuit 232 is "9" (the line number of the extension), the AND gate 942 is opened by the output of the decoder 945, and the clock signal CL is sent to the flip-flops 902, 906, 910. , 914, but at this time, since the "telephone connected (200)" and "MEL1 connected" signals are applied to the D terminals of flip-flops 902 and 910, respectively,
10 is set. Each output of flip-flops 902 and 910 connects a photocoupler 91, respectively.
8 and relay 926 are driven, the corresponding thyristors 918-1 and 918-2 are activated.
and relay contacts 926-1, 926-2 are closed, and telephone 200 is connected to the extension of extension link 260 and inter-device call link 410.

The operation of the present invention has been described above based on the embodiment shown in FIG. This method directly determines the location where the called party's central device is placed as the slave and the calling party's central device as the master. However, apart from this, the calling party's central equipment does not directly determine the accommodation location, but sends dialing information to another central equipment, and the central equipment that has the telephone number corresponding to this dialing information receives the caller's central equipment. There is also a method in which the called party's central equipment that responded is determined to be the slave, and the calling party's central equipment that received the response is determined to be the master.

Further, in the embodiment shown in FIG. 4, a mode register is provided corresponding to the link between devices, and the line number of the office line or extension line connected to the link between devices is stored in the mode register. It is also possible to provide a mode register for each office line and extension line, and store in the mode register the link number of the inter-device link connected to this line.

The embodiments in which the control method of the present invention is implemented using wire logic have been described above.
The receiving circuits 221, 321, switching circuit 223,
323, inter-device circuit 224, 324, mode register 225, 325, translator 230, 3
30, and further subscriber circuits 220, 3
20. A part of the link control circuits 227, 327, extension circuits 229, 329, office line circuits 231, 331, and timing signal generation circuits 232, 332 can also be realized by an accumulation program control method using a computer such as a microcomputer or a minicomputer. can.

Further, although the embodiment of the button telephone device has been described above, the extension circuit 22 in FIG.
It is clear that the control method of the present invention can be used in general exchanges by replacing the 9, 329 and central office line circuits 231 and 331 with extension trunks and central office trunks, respectively.

Furthermore, the above explanation is for the case of a centralized control system that has a central device and is centrally controlled by the central device, but the link circuits 228, 328, extension circuits 229, 329, office line circuit 231, 331 etc. are distributed among the telephones 200, 201, 300, 301, etc., the calling party of the present invention can be controlled as the master and the called party as the slave.

As explained above, when the control method according to the present invention is used for connection between telephone devices, it is possible to provide the same functions for calls connected between devices as for calls within a single device. In order to increase the line capacity of a device or exchange, there is no need to replace it with another device with a larger capacity as in the past, and it is only necessary to add the same device, which is excellent in economy.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing an example of device connection used in the present invention, Fig. 2 is a circuit diagram showing an example of a call link in the button telephone device of the present invention, and Fig. 3 is a configuration showing the concept of the control method of the present invention. 4 is a block diagram showing an embodiment in which the present invention is applied to a button telephone device, and FIG. 5 is a time chart showing the time allocation for control of the telephone and the central unit in the embodiment of FIG. 4. FIG. 6 is a block diagram showing a detailed example of the telephone 200 in the embodiment of FIG. 4, and FIG. 7 is a block diagram showing a detailed example of the receiving section of the subscriber circuit 220 corresponding to the telephone 200 in the embodiment of FIG. 8 is a block diagram showing a detailed example of the transmitter corresponding to the telephone 200 of the subscriber circuit 220 in the embodiment of FIG. 4, and FIG. 10 is a block diagram showing a detailed example of the station line circuit 231 in the embodiment of FIG. 4, and FIG. 11 is a block diagram showing a detailed example of the station line circuit 231 in the embodiment of FIG. 4. FIG. 12 is a block diagram showing a detailed example of the inter-device circuit 224 and the mode register 225. FIG. 13 is a block diagram showing a detailed example of the link control circuit 227 and link circuit 228 in the embodiment of FIG.

Claims (1)

[Claims] 1. Each of the at least two telephone devices has at least one central office line link and a plurality of extension links, and at least one inter-device link between the at least two telephone devices; for,
call detection means for determining whether the call is to an extension link or central office line within the telephone device or to another telephone device, based on a selection signal of the call; a mode register for storing that the telephone device is the master side for the call when it is determined that the call is a call to the telephone; In contrast, switching means is configured to make the telephone device a master side, transmit the call information to another telephone device via the inter-device link, and make the telephone device the slave side of the transmitted telephone device. Among the at least two telephone devices, the telephone device that is the calling party for a call via the inter-device link becomes the master side for the call, and the other telephone device becomes the slave side and becomes the master side. connected by the inter-device link such that the at least two telephone devices function as a single telephone device for the call; A connection control method between telephone devices characterized by: