JPH0246151Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention accommodates an outside line, a key telephone, and a two-wire standard telephone, and puts an active outside line on hold according to the hold information from each telephone. The present invention relates to a button telephone device having the functions of:

[Conventional technology]

In general, key telephone devices are equipped with a hold circuit for an outside line, and when hold information is given from a telephone that is talking to an outside line, the hold circuit is activated and a hold state is set. When accommodating a standard telephone, if hooking is used as hold information, it will be difficult to distinguish it from a momentary loop interruption due to the connection operation of the outside line exchange. Thereafter, a method has been proposed in which it is determined whether the information is on hold by monitoring the loop interruption time, and if it is determined to be held information, the held state is continued, but if it is determined that there is a momentary loop interruption, the held state is released. The details are disclosed in Japanese Patent Application No. 59-267530 filed separately by the applicant.

[Problem that the invention attempts to solve]

However, the main device sequentially repeats data transmission with each key telephone using a fixed polling cycle,
In addition to determining the operation status of each button telephone according to this, when controlling each button telephone, we always detect loop breakage of the standard telephone and determine this time, so we use the corresponding standard telephone. A dedicated sub-control unit must be provided, and the main control unit controls the hold circuit according to information from the sub-control unit, resulting in a delay of up to 200 + several tens of milliseconds from the occurrence of a loop break to the setting of the hold state. During this period, if the loop continues to be disconnected, depending on the type of exchange on the outside line side, the exchange may recover or, if the private branch exchange is used as an outside line, the exchange may respond.

That is, for example, time required by the sub-control unit Noise judgment time 20 msec Time required by the main control unit Information acquisition delay time of the sub-control unit due to polling 100 msec Hold relay drive processing time 100 msec 〃 operation delay time 10 to 20 msec Total 230 to 240 msec During this period, the aforementioned problems arose, and this trend has become particularly noticeable in foreign countries.

[Means for solving problems]

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

That is, in the above-mentioned button telephone device, a sub-holding circuit temporarily puts an outside line connected to the standard telephone on hold; a loop detection circuit detects the state of the DC loop indicating various operation information from the standard telephone; When the loop breakage detection power of this detection circuit occurs, if the corresponding standard telephone is in the middle of an outside call, the sub-control unit immediately activates the sub-hold circuit and then determines whether the loop breakage detection power is hold information. and a main control section that operates a holding circuit for a corresponding outside line when this control section determines that the holding information is hold information.

[Effect]

Therefore, if a loop break occurs, the sub-holding circuit operates immediately and puts the currently active outside line on hold.The original holding circuit then operates based on a subsequent judgment, so that unnecessary loop breakage for the outside line does not occur. .

〔Example〕

Hereinafter, details of the present invention will be explained with reference to figures showing embodiments.

FIG. 1 is a block diagram showing the entire configuration. The main unit (hereinafter referred to as KUS) 1 has external lines 2 ₁ to 2 such as a central office line from a central office or a telephone line from a private branch exchange.
key telephones (hereinafter referred to as ST) 4 ₁ to 4 m through connectors CN ₁ to CNm according to the accommodation positions, and lines 3 ₁ to 3 m each consisting of a pair of communication lines and signal lines. _is connected _, and a two _- wire standard telephone (hereinafter referred to as SST) 4 _{n + 1} , 4 _n+2 are connected, and the outside lines 2 ₁ to 2n are each connected to the communication path switch (hereinafter referred to as TSW) 12 via outside line interfaces (hereinafter referred to as LIF) 11 ₁ to 11n. , TSW 12 and the lines 3 ₁ to 3 n+2 from each ST4 ₁ to SST 4 _{n+ 2} are connected via telephone interfaces (hereinafter referred to as TIF) 13 ₁ to 13 _n+2 ,
Exchange connections are made through cross points such as analog switches or relay contacts in the TSW 12.

However, TIF13 _n+1 and 13 _n+2 have a switching function between the outside line side and the extension side, and the extension side is connected to TSW12, but the outside line side is connected to LIF1 of TSW12.
Connected to side 1.

The LIFs 11 ₁ to 11n have functions such as incoming call detection, DC loop closure for outside lines, hold, and dialing using pulse signals or composite audio _frequency signals.
Between ST4 ₁ and 4m, and between ST4 ₁ and SST4 _n+
While having the exchange connection function between _two , TIF13 ₁
-13m supplies power for communication to _ST41 to ST44m via the communication line, sends and receives data signals by polling at a fixed period via the signal line, and
It is designed to supply power for control, etc.
TIF13 _n+1 and 13 _n+2 are responsible for supplying telephone power to SST4 _n+1 and 4 _n+2 , sending out various signals such as ringing signals, and detecting the DC loop closure status. ing.

In addition, the KSU 1 is provided with a main control unit including a processor (hereinafter referred to as CPU) 14 such as a microprocessor, a fixed memory (hereinafter referred to as ROM) 15, and a variable memory (hereinafter referred to as RAM) 16. is executed by the CPU 14 and controlled while accessing predetermined data to the RAM ₁₆ .
Incoming call detection power from 11n, TIF13 ₁ ~ 13m
Operation data from ST4 ₁ to 4m via
Make control decisions based on the detection of the operation status of SST4 _n+1 and 4 _{n+2 by} TIF13 _n+ 1 and 13 n+2,
Controls the LIF111 _to 11n and the TSW12, and controls the ST41 _to 4m by transmitting control data via the TIF131 _to 13m, and
SST4 _n+1 , by control of TIF13 n+ ₁ , 13 _n+2
4. It is designed to send various signals to _n+2 , switch connections, etc.

In contrast, in ST4 ₁ to 4m, a communication circuit (hereinafter referred to as TKC) 31 is connected to a communication line 32, and a transmission circuit (hereinafter referred to as TKC) is connected to the communication line 33.
SRC) 34, CPU 14 and ROM 15,
Similar to RAM16 but smaller CPU3
5 is connected to the digital display (hereinafter referred to as DP) in the display circuit (hereinafter referred to as DP) 36.
DGP) and tone generator, amplifier,
In accordance with the control data via the SRC 34, the display by the DGP and the emitting of the incoming ring tone by the speaker are performed, and also in accordance with the control data,
Lighting of each indicator light in the keyboard (hereinafter referred to as KB) 37 equipped with dial keys and function keys,
In addition to controlling the lights off and blinking, operation data indicating these conditions is sent to SRC3 in response to the operation of each key in KB37 and the operation of the switch HS.
It is designed to be transmitted via 4.

Note that the SRC34 has a power supply separation function, extracts the power supplied from the HSU1 side via the signal line 33, stabilizes it, and supplies it as local power V to each part that requires it. , CPU3
comes with ROM38 and RAM39,
It is used in the same way as ROM15 and RAM16 of KSU1.

Therefore, when off-hook is performed in any ST4, the operation data of this is transferred to the CPU 14.
The key operations in KB37 are also the same, and the CPU 14 outputs TSW12 in accordance with the outside line key or extension key operation and the dial key operation.
In addition, if the call is an external line, the dial call is made under the control of the selected LIF 11, and if the call is an extension call, the dial call is made by controlling the selected LIF11.
Under the control of DP36 over ST4, an extension call is issued, and depending on the response from the other party,
A call state is established using TKC31.

Also, incoming calls from outside lines 2 ₁ to 2n are sent to LIF 11 ₁
~11n and accordingly CPU1
4 controls the DP36 of each ST4 ₁ to 4m and emits an incoming call tone, so if any ST4 responds by off-hook, the
The CPU 14 controls the TSW 12 and completes the communication path.

Note that, at the same time as these controls, the indicator lights in the KB 37 are also controlled, and the corresponding lights are turned on.

On the other hand, if off-hook is performed in SST4 _n+1 and 4 _n+2 , the DC loop will be closed by TIF
13 _n+1 , 13 _n+2 , the CPU 14 responds accordingly, and SST4 _n+1 , 4 _n+2
When you make a dial call, this is TIF1
3 _n+1 and 13 _n+2 are detected in the same way, and depending on the dial number, the CPU 14 performs the same exchange connection as described above, and connection with the outside line 2 under the control of TIF 13 _n+1 and 13 _n+2. Therefore, you can talk freely depending on the response from the other party.

Also, if there is an incoming call from the external lines 2 ₁ to 2n or another extension, the CPU 14 sends TIF13 _n+1 ,
13 _n+2 and sends a ringing signal to SST4 _n+1 and 4 _n+2 , which notifies the incoming call, and if they respond by off-hook, the DC loop closes. and CPU14 is TIF13 _n+1 ,1
3 Control _n+2 or TSW 12 and complete the communication path.

In addition, each ST4 ₁ is stored in RAM16 of KSU1.
- 4m and a last number area for redial corresponding to ST4 1 - 4m are provided, and a common speed dial area and automatic dial area are provided for each of multiple dial numbers for each ST4 ₁ - 4m.
These are used as dial memory, speed dial memory (hereinafter referred to as CDM), and automatic dial memory (hereinafter referred to as ADM), and the contents of CDM and ADM are as _follows :
CPU1 according to each dial number registration operation from
4 performs storage, and if there is a number display operation in any ST4, the CPU 14 reads the corresponding number from COM or ADM and sends it as control data.
The CPU 35 controls the DP 36 accordingly,
The dial number is displayed using DGP.

FIG. 2 is a block diagram of TIFs 13 _n+1 and 13 _n+2 , and in this example, LIFs 11 ₁ and 2 m with external lines 2 ₁
Contacts hr1 and hr1 of holding relays HR1 and HR2 are respectively connected to terminals CO1 and CO2 connected to
Sub-holding circuit (hereinafter referred to as SHD) 41 ₁ via hr2,
41 ₂ are provided, and these terminals CO1, CO2
is selected by contact xc of relay XC, and
Contact xs of relay XS for switching between external line side and internal line side,
And, the terminal TEL for SST4 is connected via a harp detection circuit (hereinafter referred to as LPD) 42 using a photogapler or the like.
connected to.

Note that latching relays are used for relays XC and
If the loop current from the LCF43 passes due to the off-hook of the SST4, this is detected by the LPD42, and the CPU4, which has the same configuration as the CPU14, ROM15, and RAM16, but has smaller functions,
In order to provide detection power to the sub-control unit by SST 4, loop breakage is detected by hooking SST 4, sending dial pulses, etc.

Further, the CPU 44 exchanges data with the CPU 14 via the terminal DT in response to polling from the CPU 14, and if it is determined to be pending information by monitoring the hooking time, this operation data is sent to and received from the CPU 14 via the terminal DT.
While sending the information to the CPU 14, it also controls each relay via the drive circuit (hereinafter referred to as DRV) 45 according to the control data from the CPU 14, and if it is determined that the information is on hold, relay HR1 or HR2 is set to the connection status with the outside line. Therefore, it is designed to operate for a certain period of time.

Therefore, when the SST4 goes off-hook and makes a dial call, this operation information is sent to the CPU44.
The CPU 44 operates according to the control data that is given to the CPU 14 via the
It controls a predetermined relay via DRV45, and if it is an extension call, the operation of relay XI will
Connected to terminal INT to TSW12 via contact xi,
If it is an outside line call, depending on the operation of relay XS and the operation or recovery of relay XC, LIF11 ₁ or
It is connected to LIF 11n and the communication path is completed.

On the other hand, when a call is received, a ringing signal generator (hereinafter referred to as RGG) 46 is connected via contact sr by the operation of relay SR, and a 16Hz ringing signal with superimposed DC current is sent from RGG 46 to SST 4. The SST4 toringer rings to notify you of an incoming call.

FIG. 3 is a timing chart showing the status of hold control by the CPUs 44 and 14 when the SST 4 is engaged in a call with the outside line ₂₁ and the holding time is set as the hold information.
If loop b of SST4 is broken at time _t1 ,
At the same time, loop a of outside line ₂₁ is also cut off,
In response to detection of loop b disconnection by LPD42, CPU
44 measures a period _T1 set to, for example, 20 msec as a period for preventing malfunctions due to chatter, noise, etc., and immediately drives relay HR1c according to this time-up to put _SHD411 into an operating state. At time _t2 , loop a is closed and put into a hold state, and in order to drive relay HR1c and restore relay XSd at the same time, SST4 is connected to LCF43 and disconnected from the outside line side.

Next, the CPU 44 is configured internally, for example, 0.1
<T ₂ <1.0Sec, the timer e that monitors the pending information hooking period T ₂ measures the continuation of the disconnection of loop b, and if the disconnection period of loop b is within the period T ₂ , it is determined that the information is pending, and this operation is performed. Data to CPU14
In response, the CPU 14 sends the external line 2 ₁ to
This causes the holding circuit f in the LIF ₁₁₁ corresponding to this to operate, and thereby the loop a is closed twice.

Further, the CPU 44 starts another similar timer from the time _t3 when the loop b is closed again, and for example, the CPU 44 starts a separate similar timer, for example, the maximum polling cycle of the CPU 14 is 10.
0Msec, time required for holding circuit control during LIF11 ₁ by CPU14 and response time 200msec
_A total of 300 msec period T ₃ considering
For example, the maximum
After a recovery time _T4 of 100 msec, the relay HR1c is restored, and the loop a is kept closed only by the hold circuit f, resulting in a formal hold state.

In addition, if the disconnection period of loop b is less than _T2 ,
Since the CPU 44 does not determine that the information is on hold and the CPU 14 does not respond, the HR1c only operates temporarily and does not enter the official hold state, and the relay XS immediately returns to the operating state and the outside line path continues.

Similar control is also performed during a call to outside line 2n, and in this case, relay HR2 is controlled.
_SHD412 becomes operational.

Therefore, the loop break period for the outside line 2 is shortened, and recovery of the outside line side exchange or erroneous response by the operator does not occur.

However, dialing a specific number may be used as the hold information, and the configurations in FIGS. 1 and 2 may be selected depending on the conditions, and each period and time T 1 to T ₁ in FIG. 3 may be selected according to the conditions. T ₃ may be determined in accordance with the situation, and various modifications are possible.

[Effect of idea]

As is clear from the above explanation, according to the present invention, the holding loop for the outside line during a call is quickly closed and the loop break period is shortened, so there is no need to restore the outside line side exchange, and SST is accommodated. Great effects can be obtained in various types of key telephone devices.

[Brief explanation of drawings]

The figures show an embodiment of the present invention. Figure 1 is a block diagram of the entire configuration, Figure 2 is a block diagram of TIF for SST,
FIG. 3 is a timing chart of the control situation. 1...KSU (main unit), 2 ₁ ~ 2n...external line, 3
₁ ~ 3 _n+1 , ... railroad track, 4 ₁ ~ 4 m ... ST (key telephone), 4 _{n +1} , 4 _{n +2} ... SST (standard telephone),
11 ₁ ~ 11n...LIF (external line interface),
14, 35, 44...CPU (processor), 15,
38...ROM (fixed memory), 16, 39...
RAM (variable memory), 41 ₁ , 41 ₂ ... SHD (sub-holding circuit), 42 ... LPD (loop detection circuit),
HR1, HR2...Relay, hr1, hr2...Contact.

Claims (1)

[Scope of utility model registration request] A button telephone device comprising a hold circuit provided for each outside line, and a control unit that operates the corresponding hold circuit based on hold information from a key telephone and a standard telephone that are communicating with the outside line, the button telephone being connected to the standard telephone. a sub-holding circuit that temporarily puts an outside line on hold, a loop detection circuit that detects the status of a DC loop that indicates various operation information from the standard telephone, and a loop detection circuit that detects loop breakage when power is generated a sub-control unit that immediately activates the sub-hold circuit if the corresponding standard telephone is in the middle of an outside line call and then determines whether the loop breakage detection power corresponds to the hold information; A key telephone device comprising: a main control section that operates a holding circuit for each of the corresponding outside lines when a determination is made.