JPS63256093A - Key telephone system - Google Patents

Abstract

PURPOSE:To surely and easily perform call operation by a terminal by providing a means for supervising the loop closing of an external terminal equipment, a means for converting the information of the closing state into line access data and a means for connecting a main channel and the terminal equipment to a key telephone set and further providing a control means to a master equipment. CONSTITUTION:In using a DTE as an external terminal equipment, an MDM added with a function of an NCU (line network control unit) is interposed, and a modulator- demodulator MDM applies the closing of a DC loop by connecting the data terminal equipment DTE to a key telephone set 3 in response to the control of the DTE. It is detected by a loop monitor circuit 20 and the information is converted into line access data by the control section 21 and sent to the master equipment. The control means of the master equipment acquires an idle line based on the said data and sends the control data to the key telephone set to close the circuit between the channel and the MDM, and the MDM and the line stared in the master set are connected directly and various procedures till the dialing and the start of communication with an opposite party in response to the MDM based on the control of the DTE are applied smoothly and automatically.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention allows external terminal equipment such as a data terminal equipment to communicate with a key telephone using a line accommodated in the main equipment. The present invention relates to a button telephone device capable of carrying out the following functions.

[Conventional technology]

With the expansion of the range of use of button telephone devices, key telephone devices that allow external terminal equipment to be connected to the button telephone have become commercially available, and are used to communicate with data terminal equipment (hereinafter referred to as DTE). In this case, the DTE is connected to the key telephone via a modem (hereinafter referred to as MDM), the key telephone acquires a vacant line and makes a dial call, and after confirming the exchange connection to the other party [7rE], a specific Communication is started by performing the operation.

However, if the other party is in automatic reception mode, the other party's MD
Until the line is released due to non-detection of a carrier wave by the MK, a specific operation must be performed to instruct the start of communication.

[Problem that the invention seeks to solve]

Therefore, in the past, the key telephone had to be operated manually, which was troublesome, and if the other party was in automatic reception mode, the DTE had to be operated immediately after operating the key telephone. In particular, when the key telephone and the DTh are installed at a distance, there is little time available, and operational delays can cause problems such as the inability to start communication smoothly.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention is constructed by the following means.

That is, a button telephone is equipped with a connecting means to which a two-wire external terminal device is connected, and the external terminal device is connected to the communication path of the button telephone through the connecting means, and the external terminal device and the line accommodated in the main device are connected. In a button telephone device that performs communication, a loop monitoring means for monitoring loop closure of an external terminal device connected by a connecting means, and a line for transmitting information on the loop closure status based on the output of this monitoring means to the main device. The button telephone is provided with a data conversion means for converting into access data, and a closing means for closing a circuit between the communication path and the connection means in accordance with control data from the main device. The main device is equipped with a control means for seizing a vacant line and transmitting control data to the key telephone.

[Effect]

Therefore, when using a DTE as an external terminal device, it is necessary to
By interposing the DM and connecting the DTE to the key telephone, the MDM closes the DC loop in accordance with the control of the DTE.This is detected by the loop monitoring means, and the loop is established based on the output of The closure status information is converted into line access data by the data conversion means and then transmitted to the main device.

Then, the control means of the main device captures the idle line based on the line access data, transmits the control data to the key telephone, and closes the circuit between the communication path and the connection means. and the line housed in the main device, and under the control of the DTE (responsive to the MDM), various procedures from dialing and starting communication with the other party are carried out smoothly and automatically. be able to.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to figures showing examples.

FIG. 2 is a block diagram showing the configuration of a communication system, in which a DTE such as a personal computer is connected to a key telephone (hereinafter referred to as 5T) 3 of a key telephone device via an MDM 2 having an NCU function. Sr1 and Sr1 are connected to the main unit (hereinafter referred to as KSU) 4 by a pair of communication lines and a signal line, and KSU 4 is connected to the telephone line 5 accommodated in this.
It is connected to an exchange (hereinafter referred to as EX) 6 of the exchange center via.

Further, an MDM 8 equivalent to the MDM 2 is connected to the EX 6 via a similar line 7, and a DTE 9 equivalent to the DTEl is connected through this, and these are the other side of the DTEL side.

In addition, the KSU4 accommodates a plurality of lines 5 which are omitted in the figure, and is connected to a plurality of Sr1.
Switch connections between T3s and between each ST3 and each line 5
SU 4 is supposed to do it.

FIG. 1 is a circuit diagram of Sr1 5, line terminal LL+U! to which the telephone line 11111 and signal line 12 from KSU4 are connected, respectively. and L, each have a line transformer T
The primary windings of L and T are connected, and a power supply unit (hereinafter referred to as PS) 13 is connected between these neutral points, and is supplied from KSU4 via each line 11 and 12 in a superimposed manner with each signal. PS13 extracts the DC power source, stabilizes it, and
The local power supplies are supplied to each section as +VD and +VC.

In addition, a selector (hereinafter referred to as 5EL) 14 using an analog switch is connected to the secondary winding of the line transformer T1, and a connection terminal EXT1 such as a connector to which a two-wire external terminal device is connected is connected. ．． EXT, a telephone circuit including a handset (hereinafter referred to as TKO) 15, a hands-free circuit including a microphone and a speaker (hereinafter referred to as T(S)
F) A transmitting/receiving circuit (hereinafter referred to as 5RC) that performs data transmission and reception using pulse signals is installed in the secondary winding of the line transformer T, which performs selective connection to the 16, etc.
17 is connected, thereby transmitting operation data from the STa side and receiving control data from the KSU 4.

On the other hand, between 5EL14 and connection terminal EXT1,
A DC blocking capacitor C6 and relay contact r are inserted, and the connection terminal EXT is connected by the operation of contact r.
1 is connected to a ringing signal generator (hereinafter referred to as RGG) 18,
From now on, connect terminal EXT 1. EXT, for 16
A Hz ringing signal is sent out, and
Connect the current supply circuit (hereinafter referred to as CF) directly to the connection terminal EXT 1.
D) 19 is connected, and by supplying current from now on, the connection terminal Dσ0. In response to the closure of the DC loop between the terminals EXT and EXT, a loop current flows back to the terminal EXT, and this is detected by a loop monitoring circuit (hereinafter referred to as LPS) 2G.

In contrast to the above, a control unit (hereinafter referred to as CNT) using a processor such as a microprocessor (hereinafter referred to as CPU) and memory etc.
) 21 is installed to make control decisions based on control data via the 5RC17, operation output from the keyboard (hereinafter referred to as KB) 22, output from the hook switch Is, output from the LPS 20, etc., and displays indicator lights and digital displays. , a display circuit (hereinafter referred to as DP) 23 including a tone ringer, etc., a relay R,
5EL14. RGGlB.

It controls the CFDI 9, etc., gives commands to the 5RC 17, and transmits operation data indicating the operation status.

In addition, in RGGlB, voltage VD during the power supply is applied to the primary winding of the transformer PT via the resistor R□ and the reverse current blocking diode D1, and a transistor (hereinafter referred to as 'TR) For the base of Q□,
A constant cycle drive signal is applied through resistor R2, and TR-Q
An intermittent current is passed to the primary winding when the power is turned on and off, and the AC voltage generated in the secondary winding is connected to the diode 011.
108 # A voltage doubler rectifier circuit consisting of capacitors ct, C, and resistor R8 creates a pulsating current of the double voltage, and resistor "
4+R5 and a protection circuit for varistor vR1, and
Through the capacitor C8 for AC extraction, low power and 16
It is sent as a Hz calling signal.

Note that a bypass resistor R6 and TR-Qi are connected between the resistor R6 and the capacitor C8, and an intermittent signal is applied to the base of TR-Q through the resistor R9.
By turning this on and off, the calling signal to be sent is intermittent.

On the other hand, in CFDI9, power supply +vD is applied to the connection terminal EXT□ via resistor R11, and TR-Q□□ and resistor R12 are connected in parallel to this, and resistor R and photocoupler (hereinafter referred to as , PC) 24 to the base of TR-Qll.
By applying a control signal through the resistor R1B to the base of TR-Ql inserted in parallel with the light-emitting diode and resistor R□, and turning on TR-Q□, 9
, the PC240 light-emitting diode is energized from the power supply +vc and emits light, the light-receiving transistor of the PC24 is turned on, and accordingly, TR-Q, , is also turned on, and a normal current is supplied from the power supply +vD. It has become.

The loop current supplied by this is connected to the connecting terminal EXT□
, EXT, depending on the loop closure between the same terminal Y,.

connected to the side and detected by LP82G, but LPS20
In this case, the terminal voltage is detected according to the flow of the loop current generated in the varistor inserted between the terminal EXT and the power supply return path, and the capacitor Cl1l for chattering absorption, and the terminal voltage is detected through the resistor R11. The terminal voltage of the lever is applied to the base of TR-Q, □, and this
GCTR when the voltage between the base and emitter of
-Q, □ turned on, power supply +v via resistor R1m
TR-Q where c is applied and it is “H” (high level)
, □ is set as rLJ (low level), and the capacitor Ca! for noise removal is set as rLJ (low level). and through resistor R2B,
It is sent to CNT 21 as a detection force for "L".

In addition, CNT21 has connection terminal EXT, EXT
, if it is determined that a call signal should be sent to the resistor R81.
In order to apply the rHJ drive signal to the pace of TR-Q8□ through the TR-Q8 and turn on TR-Qal, the relay R inserted into the collector of this is operated by the power supply +vD, and as described above, the connection terminal EXTl Connect RGGl8 to.

Therefore, as shown in Figure 2, the 92-wire MDM2 is
Connect to the connection terminals EXTl, EXT, and further connect to DTEl.
After connecting to MDM2, control MDM2 by DTEl, and connect terminals EXT□, EXT by MDM2.
, CFDI 9 in Fig. 1 is obtained by closing the DC loop between ,
A loop current flows from L through resistor R11, and this
CNT is detected by P820, and CNT
21 converts the information on the closing status by the MDM 3 into line access data, and transmits it to the KSU 4 via the 5RC 17 as a call request to the line 5.

In response to this, the KSU 4 captures the line 5 and connects it to the communication line 11 at ST3.

When the CNT21 receives this data via the 5RC17, it controls the 5EL14 and connects the connection terminal EXT1 via the line transformer Tl and the capacitor C8. At the same time, TR-Qti and Qll of CFDI 9 are turned on to start supplying normal loop current to MDM 2, and the communication path between MDM 2 and line 5 is completed.

Next, a dial tone from the EX6 arrives through the completed communication path, which is detected by the MDM2 and this information is given to the DTEl. In response, the DTEl sends a dialing command using character dialing to the MDM2. According to this, the MDM2 performs dialing using pulse signals, so this is the LP820.
is detected by CNT 21 via , and CNT 21 transmits the access data for dialing in response to 5 =
1r to KSU4, and upon reception of this, K
When SU4 makes a dial call to the halo and an exchange connection is established by Ex6's response, the other party's MDMa responds, and as the carrier wave transmission and reception between MDM2.8 begins, data communication between DTEl and 9 begins with MDM2 , 8.

However, if the line 5 does not use a pulse signal as a dial signal but uses a composite voice frequency (hereinafter referred to as MF) signal as a dial signal, ST3 and KSU4 do not relay dialing (from MDM3 to MDM3). Dialing is performed directly using the MF scratch signal.

In addition, in response to the end of data communication, a line release command is sent from DTEL, and this causes! l If MDM2 opens the DC loop, this will connect CNT 21 via LP820.
CNT21 transmits this information to 5RC17 as line access data for line release.In response, KSU4 releases line 1s5, restores EX6, and sends control to ST3. Send data and restore CNT21 to TKC15 or H8F16 side of 5KL14 and TR of CFDI9
- Control is performed to turn off Qt1+Qtt and returns to the standby state.

In contrast to the above, DTE9. When a p call is made from the MDMa side and the call is received via EX6 to KSU4, KSU4 detects the arrival of a paging signal from line 5 and sends control data indicating this to ST3, so this is the 5RCI.
7) TR-Ql of RGGl8 controls on and off the TR-Ql wQll and also
TR”Q61 is turned on and relay R is operated, 16H
z's intermittent paging signal is sent to the MDM2.

Then, MDM 2 detects this without activating a tone ringer, etc., and gives this information to DTE 1, so that DTE 1 responds automatically, or if it responds manually, it tells MDM 2 to seize the line. In order to send out the command, the DC loop is closed in the same way as above,
In response, CNT 21 stops the control of RGGl B and restores relay R, and also controls 5R in this situation.
CNT21 transmits via C17, receives it by KSU4, and sends control data), and CNT21 receives 5E.
The communication path is completed by controlling L14 and CFDI 9, and data communication between DTEs 9 and 1 is performed.

Figure 3 is a flowchart of the control situation by the CPU installed in the CNT21 of ST3.
Next to TARTJ, perform "initialize" 101, then perform interrupt "INT disable/cancel" 102, and then 5R
C17 reception output, KB22 output, hook switch H
The output of 8, the detection power of LPS 20, etc. are accepted by interrupt processing, and the [acceptance end t]
If J 111 becomes Y (YIJ), "INT is prohibited"
112 and the received "control data analysis/processing" 113, then during step 1110 the KB is
22. Is there a sweeping output from the hook switch H8, etc.?
J 121 is determined, a response is made according to Y of this, operation data creation 122' is performed, and further step 111
(-LPS output from LPS20?, 41
31, and if it is Y, the loop closure status and dial pulse intermittent status are determined as "input signal count" 13.
"Create access data" according to the loop closing information and dial number obtained by 2 and indicated by this 1.
Do 33.

Next, a certain period of time that determines the cycle of these operations ``t1 elapsed?j'' is monitored by a timer configured in the CPU, and in response to Y, the same <``IN'' as in step 102 is monitored.
After performing "T prohibition/cancellation" 142, step 111
Repeat the following.

Note that each data created in steps 122 and 133 is transmitted in step 113 in response to reception of a polling signal from the KSU 4.

Therefore, the loop closure information by MDM2 and □ M
The dial data based on the pulse signal from DM2 is converted into line access data in steps 132 and 133, and is sent to KSU4 together with other operation data.

Further, the control data from the KSU 4 is analyzed in step 113, and control is executed accordingly.

The dialing number from MDM2 is 5T30.
Make the dialing number and first digit by KB22 different,
As something that can be identified in K8U4, υ, DTEL
The same applies when the MDM2 is attached to a plurality of ST3s and performs data communication between extensions.

FIG. 4 is a flowchart of the control status performed by the CPU of KSU4 in response to reception of operation data and access data from ST3.
If J201 is Y, this is [MDM dial data? j 202, and “MDM outgoing request? J
203, and if both are N, display "process other received data" 211 and "process received data from next ST" 212, and repeat step 201 and subsequent steps via other routines. .

Also, when step 203 is Y, the status data in the memory attached to the CPU is used.[Is the ST idle?] Check J 221, and if this is Y, select “MD
"M dial mode setting" 222 is performed by setting a flag, etc., and the process moves to step 212.

On the other hand, depending on Y in step 202, whether the MDM2 is connected or not based on the setting data in the memory is checked. 1 digit?
Determine J 232 and select Y according to the number [External call request? J 233 is judged, and if this is also Y, there is a message in the memory [External number in registration area?]. J
241, and if this is Y and line 5 has been accommodated, check the status data in the memory and check ``Is this outside line empty?'' 242. In response to this YK, check ``Acquire this outside line J243.&''. “M” similar to 222
DM outside line call mode setting" 244.

For the above, either step 241 or 242 'NN
In this case, similarly to step 241, [Is there an external line that is allowed to be called by the ST? Check J 245 and perform "acquisition of the relevant air line" 246 according to Y of this, and step 2
44.

If step 245 is N, "#, send busy tone to ST" 247 is performed to notify the inability to make an outside line call.

Also, depending on N in step 233, the numbers in the dial data may be changed to [extension call request? Judging J 251,
"MDM extension call mode setting" 252 according to Y of this
is performed in the same manner as in step 222, and then stored in the buffer area of the memory by "Storing first digit numeric buffer area" 253.

Similarly, when step 251 is N, select [Speed dial request?]. J 261 is determined, and if this is also N, the process moves to step 247, whereas Y in step 261 is determined.
In response to this, K "MDM speed dial mode setting" 262 is performed in the same manner as in step 222, and then the process moves to step 253.

On the other hand, if step 232 is N, the second digit of the dial is pressed, and corresponding to step 244, [MDM external call mode? Check J 271, and if it is Y, perform the "external dialing process" 2T2 based on the number in step 253 and the second digit number, and if step 271 is N.
If so, in correspondence with step 252, check l"MDM extension calling mode? J281, and in response to Y in this check, similarly to step 241, select "MDM in the registration area" of the memory.
Is there an M mode ST number? 42B2 is checked, and if this is N, the process moves to step 247, whereas if it is Y in step 282, "MDM extension call processing" 28 is performed.
According to 3, 9, exchange connection between STs is performed, and if step 281 is N, check ``MDM speed dial mode? J 291'' corresponding to step 262, and according to this N, step 247 On the other hand, when step 291 is Y, "speed dial processing" 292 is performed.

FIG. 5 shows a lower routine 69 showing the details of step 292, which checks and controls "External line number in registration area? J" 301 to "Catch the external line" 311 in the memory, similar to steps 241 to 243 in FIG. After doing it,
``Speed dial transmission processing'' 311 is performed based on the first and second digits of the dial data.

Also, like steps 245 and 246 in FIG.
Is there an outside line allowed for outgoing calls on T? J321, r acquisition of the relevant air line”
322 and proceeds to step 311. On the other hand, in response to step 321 ON, "send busy tone to the relevant ST" 331 is performed in the same way as step 247 in FIG. 4.

Therefore, in KSU4, MD via ST3
Depending on the call request and dial data from M2, it is determined whether the call is an internal call or an outside call, and if the call is an outside call,
After capturing a vacant line among the pre-assigned lines 5, it makes a dial call using the dial number indicated by the dial data, or dials a dial number corresponding to the abbreviated number indicated by the dial data. cormorant.

As described above, 9. DT can be used without any special operation of ST3.
Due to El operation or automatic call operation (F), KSU4 responds via MDM2 and ST3, captures a vacant line, and dials out, so data communication is performed in response to the response from DTE9 on the other side, making the operation easy. And easy to do,
This ensures that the DTEL connected to ST3 can initiate calls and data communications without causing any operational errors.

Dial number and MDM using ST3 operation
The dialing number from 2 is not a separate number,
Based on the information on DC loop closure by MDM2, MDM
It is also possible to use KSU4 to identify a dial call from 2, or to use only a specific outside line for an outside line call from MDM2. It is also optional to apply only a specific transmission mode to transmissions from the MDM 2 without selecting any transmission mode.

In addition, as an external terminal device connected to ST3, MDM
Various modifications are possible, such as not only DTE 1 and DTE 1, but also facsimile machines, answering machines, and other various devices having equivalent call/receive functions can be applied.

[Effects of the Invention] As is clear from the above explanation, according to the present invention, the line can be captured and dialed through ST and KSU by only the operation of the external terminal equipment, and the other party can respond. Since communication can be performed easily, calling operations using external terminal devices are reliable and easy, and a remarkable effect can be obtained in various key telephone devices including STs that have a connection function for external terminal devices.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, and Fig. 1 is a circuit diagram of the ST, Fig. 2 is a block diagram showing the configuration of the communication system, Fig. 3 is a flowchart of the control situation by the ST CPU, and Figs. 4 and 8g5. The figure is a flowchart of the control situation by the CPU of the KSU. 1.9...D'l (data terminal device), 2゜8・
...MDM (Modulator/Demodulator), 3...ST (Key Telephone), 4...KSU (Main Unit), 5.7...
...Line, 11...Talking line, 12...Signal line,
14...SEL (Selectan, 1T...SR
C (transmission/reception circuit), 18...RGG (calling signal generator), 19...CF'D <current supply circuit), 2
0...LPS (loop monitoring circuit), 21...
CNT (control unit), L0 to L4...Line terminal, E
XT engineering, EXT,...connection terminal, R...relay, r...contact. Patent applicant: Tamura Electric Co., Ltd. Agent: Masaki Yamakawa (2 people for 9 years) Figure 2

Claims (1)

[Claims] A key telephone is provided with a connection means to which a two-wire external terminal device is connected, the external terminal device is connected to a communication path of the key telephone via the connection means, and a line accommodated in the external terminal device and the main device is provided. A button telephone device that communicates with the main device includes loop monitoring means for monitoring loop closure of an external terminal device connected by the connection means, and information on the loop closure status based on the output of the monitoring means. The button telephone set is provided with data conversion means for converting into line access data to be transmitted to, and closing means for closing a circuit between the communication path and the connection means in accordance with control data from the main device, and A button telephone device, characterized in that the main device is provided with a control means for capturing an idle line based on the received line access data and transmitting control data to the button telephone device.