JPH0261200B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to telephone switching equipment.

[Conventional technology]

Conventionally, a two-wire telephone is connected to the main device by an interface circuit containing loop monitoring means,
On-hook of a two-wire telephone is detected by the loop breakage output of the loop monitoring means.

[Problem that the invention seeks to solve]

In this case, it is desirable that the on-hook detection time be as short as possible in order to improve the responsiveness of the system. However, recently, a service has been provided in which a station sends out periodic polarity reversal charging pulses according to the user's wishes. In that case, if the on-hook detection time is shorter than the off time of the polarity reversal charging pulse, the polarity reversal charging pulse will be erroneously detected as on-hook. Therefore, in the past, it was necessary to separately provide means for setting the presence or absence of billing services, and to determine the on-hook detection time according to the settings.

[Means for solving problems]

The telephone switching device of the present invention focuses on the current system in which billing services do not coexist with telephone services, and
Using the setting means of the telephone service, the first on-hook detection time is shorter than the cut-off time of the polarity reversal charging pulse when the call-back service is provided, and is longer than the above-mentioned cut-off time when the call service is not provided, depending on the setting contents of the setting means. A determining means is provided which selects a second on-hook detection time and determines that an on-hook has been detected when the time measured by the timer means for measuring the loop break output time of the loop monitoring means reaches the selected on-hook detection time. be.

[Effect]

When receiving billing service, since the telephone service is not set, the determination means selects the second on-hook detection time which is longer than the break-off time of the polarity reversal charge pulse, and selects the second on-hook detection time which is longer than the cut-off time of the polarity reversal charge pulse. When the time is reached, it is determined to be on-hook.

〔Example〕

FIG. 1 is a block diagram showing an embodiment in which the present invention is applied to a button telephone device. In the figure, 1 indicates the main device. This main device 1 has an external line terminal L.
External lines 2, _{2 1} - 2 _o such as central office lines from the central office or telephone lines from the private branch exchange are connected via (L ₁ - L _o ), and the connector CN is connected as a slave unit.
(CN ₁ to CN _n ) and lines 3, 3 ₁ to 3 _n each consisting of a pair of communication lines 3A and a signal line 3B,
Key telephones 4, _{4 1} to 4 _n-1 and a two-wire telephone 5 are connected. However, two-wire telephone 5
Since it is connected only to one pair of communication lines 3A, the telephone adapter 6 performs 4-wire to 2-wire conversion.

The outside lines 2 ₁ to 2 _o are connected to the communication path switch 12 via outside line interfaces 11 and _{11 1} to 11 _o , respectively. On the other hand, the communication path switch 12 and the lines 3 ₁ to 3 _n from each handset 4 ₁ to 4 _n are connected via telephone interface circuits 13, 13 ₁ to 13 _n , and the analog lines in the communication path switch 12 Exchange connections are made by cross points such as switches or relay contacts.

The outside line interfaces 11 ₁ to 11 _o have functions such as detecting incoming calls, forming a DC loop for outside lines, holding calls, and dialing using pulse signals or composite audio _frequency signals. It has an exchange connection function between _o and slave units 4 ₁ to 4 _n-1 and 5 and between slave units 4 ₁ to 4 _n-1 and 5.

In addition, telephone interfaces 13 ₁ to 13 _n
supplies telephone power to the handsets 4 ₁ to 4 _n-1 through the communication line 3A, and supplies power to the handsets 4 ₁ to 4 _n-1 and the telephone adapter 6 through the signal line 3B. It transmits and receives data and supplies power for control.

These controls are carried out by a control section consisting of a processor unit 14 such as a well-known microprocessor, a fixed memory (ROM) 15, and a variable memory (RAM) 16, which executes a program in the fixed memory 15 to the processor unit. 14
This is performed by executing predetermined data while accessing the variable memory 16.

On the other hand, in each of the slave units 4 ₁ to 4 _n-1 , a communication circuit 41 is connected to the communication line 3A. Further, a control section which is similar to the control section of the main device 1 but is composed of a smaller processor unit 43, a fixed memory 44, and a variable memory 45 is connected to the signal line 3B via a transmission circuit 42. In response to the control signal sent from the main device 1 via the transmission circuit 42, the controller controls the emitting of an incoming ring tone and controls the lighting/extinguishing and blinking of each indicator light in the keyboard 46. Depending on the button operation and the operation of the switch HS,
Operation data indicating these conditions is transmitted to the transmission circuit 42.
The data is sent to the main device 1 via the .

Note that the transmission circuit 42 has a power supply separation function,
The power supplied from the main device 1 side via the signal line 3B is extracted, stabilized, and then supplied as local power V to each part that requires it.

In addition, in this embodiment, the slave unit (specific slave unit) 4 connected to the connector CN ₁ , that is, the housing position “1”
Reference numeral ₁ denotes a button telephone with a display device, which is equipped with a display device 47, and various operational data settings for operating the system can be set using the display device ₄ in this slave device 41.
The steps are performed one by one for each item while looking at the display shown in 7.

On the other hand, a telephone adapter 6 serving as an interface circuit for adapting a two-wire telephone to a four-wire system has a configuration as shown in FIG. In the figure, 601 is a control circuit similar to the control section of the main unit but equipped with a smaller processor unit and memory, and 602 is a loop monitoring circuit. Further, 603 is a call current supply circuit for extension lines;
604 is a PB receiver. Reference numeral 605 denotes a sound source consisting of a 400 Hz oscillator, and the control circuit 601 controls the intermittent timing of its output to generate various signal tones such as a dial tone, busy tone, and ring back tone during an extension call.
606 is a bell signal sending circuit for creating a 16Hz calling signal, 607 is an incoming call response detection circuit, 608 is a data transmitting/receiving circuit, 609 is a power receiving circuit, 610
is an extension number switch for setting an extension number. Furthermore, 611 is a setting switch consisting of a dip switch, and is a setting switch for the dial type (DP or
PB), this is where you can set whether or not to delete the hold function when a DP 2-wire telephone is connected, and whether or not there is a call phone service. If the setting is made without the telephone service, the following exceptions will occur for some functions.

(1) The on-hook detection time while making an outside call is longer than normal.
Changed from 0.2 seconds to 1 second.

(2) When hooking (off-hooking within 1.5 seconds after on-hooking), the outside line is automatically recaptured, but the outside line cannot be put on hold.

When a billing line is connected as an outside line, during an outgoing call, a response signal as shown in FIG. 3a is followed by a signal as shown in FIG. 3b periodically as a polarity reversal billing pulse. When receiving such a billing service, it is not possible to receive a call phone service again for that outside line, and in this case, the call phone service is set to no call service. As a result, the on-hook detection time, which is normally set to 0.2 seconds to improve system responsiveness, is changed to 1 second.
It is possible to avoid falsely detecting loop breakages of T2=50-100 _ns and T1=400-600 _ns as on-hook.

In addition, by not allowing hold dialing from the two-wire telephone 5 after picking up,
It is possible to avoid the inconvenience of being placed on hold without the user's knowledge. In this case, the dial signal is directly sent to the outside line.

For incoming calls, the on-hook time is set to the shortest 0.2 seconds, regardless of whether or not the telephone service is set up, since the polarity reversal billing pulse never arrives.

Next, the above operation will be explained in detail using FIGS. 4 to 8.

FIG. 4 is a flowchart showing the main processing program in the control circuit 601 of the telephone adapter 6, FIG. 5 is a flowchart showing a periodically repeated timer interrupt processing program, and FIGS. FIG. 8 is a flowchart showing details of the loop monitoring program and call state management program shown in the figure, and FIG. 8 is a flowchart showing details of the dial detection processing program of FIG.

In FIG. 4, the control circuit 601 performs initialization processing (step 101), loop monitoring (step 102), and call status management (step 10).
3) and the above-described output processing of the bell sound and various signal tones (step 104) are sequentially executed. When a predetermined transmission timing arrives (step 105), data transmission processing is performed with the main device 1 (step 106).

On the other hand, in the timer interrupt processing, whether or not a hooking timer provided in a predetermined area of the memory is in operation is checked by checking whether a flag is set in the predetermined area of the memory (step 20).
1) If it is in operation, its measurement processing is performed (step 202). Specifically, the content of the above-mentioned footing timer is incremented by "1". When the content reaches a predetermined value, that is, when the time-up output is obtained (step 20
3) The call state is registered as idle in a call state memory provided using a predetermined area of the memory (step 204). Note that instead of using such a so-called soft timer, it is also possible to use an independent timer circuit. Other processes related to timers other than the hooking timer are similarly performed (step 205).

Next, the loop monitoring program will be explained. In FIG. 6, when the execution of the program shifts to this loop monitoring, the control circuit 601 checks whether the hook state is an off-hook state based on the contents of a hook state memory provided using a predetermined area of the memory. (Step 301). If it is in an off-hook state, loop detection processing is performed to check the output of the loop monitoring circuit 602 (Step 302). As a result, if a loop breakage output is obtained (step 303), the number of times breakage has been detected is incremented by "1" in a counter provided using a predetermined area of the memory (step 304). Thereafter, the control circuit 601 checks whether an incoming call is in progress based on the contents of the call state memory (step 305), and if the incoming call is not in progress, the setting switch 611 further changes the setting to enable the call phone service. (Step 30)
6). As a result, if the telephone service is available, loop breakage will occur depending on the contents of the counter.
Check whether it lasted for 0.2 seconds (step 307),
If it continues for 0.2 seconds, it is registered as on-hook in the hook state memory (step 308).

On the other hand, if the setting is to disable the call phone service (step 306), when the loop interruption continues for 1 second (step 309), the system is turned on-hook (step 310).

If a loop break output cannot be obtained (step 303), the process moves to dial pulse detection processing (step 311), and if it is not in an off-hook state (step 301), off-hook detection processing is performed (step 312).

When the execution of the program shifts to the call state management shown in FIG. 7, the control circuit 601 checks whether or not an outside line call is in progress based on the contents of the call state memory (step 401). It is checked whether hooking is in progress based on the contents of the call state memory (step 402). If it is in the off-hook state, it is checked whether the hook state is off-hook (step 403), and if it is in the off-hook state,
Furthermore, the presence or absence of a telephone service is checked (step 404). As a result, if the telephone service is set to be available, the call state is registered as an outside line call in progress and holdable (step 405). Thereafter, a transmission request is made to transmit an off-hook code (step 406), and a relay LA (not shown) having a contact la is operated (step 407). Relay LA that is constantly restored
As a result of this operation, the contact la becomes connected as shown by the solid line, and the two-wire telephone 5 becomes ready for communication. On the other hand, if the setting is for no telephone service (step 404), the call state is registered as an outside line call in progress and not on hold (step 408). If it is not hooking (step 402), other processing is performed (step 409).

On the other hand, if an outside line call is in progress (step 4)
01), it is checked whether the call is in an on-hook state (step 410), and if it is in an on-hook state, the call state is registered as on-hook (step 41).
1). Next, a hooking timer is activated (step 412). That is, a flag indicating that the above-mentioned hooking timer is in operation is set. Thereafter, a transmission request is made to transmit the on-hook code (step 413), and relay LA is restored (step 414).

If it is not on-hook (step 410),
Dial detection processing is performed (step 415).

Next, the dial detection process will be explained. In FIG. 8, when the execution of the program shifts to this dial detection process, the control circuit 601 checks whether a dial is detected (step 501), and if detected, checks whether the dial is on hold (step 5).
02). And if the call is on hold,
It is checked whether the call can be put on hold (step 503), and if it is, the call status is registered as on hold (step 504), and a transmission request is made to send a hold code (step 505). Pending operation processing is performed (step 506).

If no dial is detected (step 501), hook state processing is performed (step 507).

In this embodiment, the telephone adapter 6 is attached externally to the main device 1, but it may be mounted on the main device 1. In addition, the telephone adapter is equipped with a control circuit having a stored program type processor unit to control the main device 1.
The control unit may perform centralized control. Similarly, although settings such as the presence or absence of a telephone service are individually set for each two-wire telephone using the telephone adapter, they may also be set and stored on the system side.

Furthermore, although a case has been described in which a two-wire telephone is connected as a handset of a key telephone system, the present invention is similarly applicable to a switching device for only two-wire telephones.

〔Effect of the invention〕

As explained above, according to the present invention, the setting means for setting the presence or absence of a telephone service is used, and depending on the presence or absence of the telephone service,
Means is provided for selecting either a first on-hook detection time shorter than the break time of the polarity reversal charge pulse or a second on-hook detection time longer than the break time, and determining on-hook detection based on the selected detection time. This prevents false detection when receiving billing services, reduces on-hook detection time in other cases, and improves overall system responsiveness, without having to provide a separate means for setting the presence or absence of billing services. be able to.

[Brief explanation of drawings]

FIG. 1 is a system block diagram showing an embodiment of the present invention, FIG. 2 is a detailed block diagram showing a telephone adapter, and FIG. 3 is a waveform diagram showing polarization charging pulses.
4 to 8 are flowcharts for explaining the operation. 1... Main device, 5... 2-wire telephone, 6... Telephone adapter, 601... Control circuit, 602...
Loop monitoring circuit, 611...setting means.

Claims (1)

[Claims] 1. A telephone exchange device in which a two-wire telephone is connected to a main device by an interface circuit including a loop monitoring means, and an on-hook of the two-wire telephone is detected by a loop disconnection output of the loop monitoring means,
A setting means for setting the presence or absence of a telephone service, a timer means for measuring the loop disconnection output time of the loop monitoring means, and a polarity reversal billing pulse that arrives from the station when the telephone service is available, depending on the settings of the setting means. a first on-hook detection time that is shorter than the off-hook time, and a second on-hook detection time that is longer than the off-hook time when there is no telephone service, and when the time measured by the timer means reaches the selected on-hook detection time; 1. A telephone exchange apparatus comprising: determination means for determining that an on-hook is detected at times.