JPH073993B2 - Multiple terminal control unit - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention can accommodate a plurality of extension connection terminals (telephones, non-telephone terminals: fax, etc.) in one telephone line, and specifies the extension connection terminals according to the selected incoming signal from the calling side. The present invention relates to a multi-terminal control device that can be connected to the above-mentioned telephone line, and in particular disables the telephone network by making it possible to set the monitoring time for confirming the reception of the selective incoming signal according to the type of the selective incoming signal. It reduces usage.

[Prior art]

Conventionally, in a multi-terminal control device capable of accommodating a plurality of extension connection terminals in one telephone line, once an incoming call is answered, the extension connection terminal is called in response to a selected incoming signal from the calling side. I try to connect to the telephone line. This connection operation will be described below based on the operation flowchart of the CPU shown in FIG. First, the system first waits in a state where the calling signal IR from the calling side can be detected (step), and when the calling signal IR is detected, the loop is closed and a response is made once (step). By this loop closure, time monitoring starts and a timer is started (step). After the loop is closed, the input guidance is sent out to prompt the input side to input the selective incoming signal (step). This input guidance is sent, for example, about 1.2 seconds after the loop is closed.
Next, it is determined whether or not an extension selection number (PB signal) has been received as one type of selective incoming signal (step). In a multi-terminal control device, a port number is assigned to each of a plurality of extension connection terminals, and when the PB signal specifies "1", for example, the first terminal (port) is connected to the telephone line. Is configured. Therefore, when the reception of the PB signal is detected in the step, the telephone line is connected to the terminal (port) designated by the PB signal (step). In steps
If the reception of the PB signal is not detected, it is then determined whether or not a calling signal (hereinafter referred to as a CNG calling signal) at the time of automatic transmission of the facsimile is received (step). This CNG ringing signal is, for example, a signal of 1100 Hz and is turned ON.
The one configured so that the period is 0.5 sec and the OFF period is 3 sec is used. Therefore, in step CN
When it is detected that the G ring signal is received twice, the telephone line is connected to a predetermined fax terminal port (step). Since the PB signal is a signal composed of a plurality of frequencies, it is extremely unlikely that noise of the same signal will be input. Therefore, the PB signal is connected to the designated port by one reception. . But 1100
Since the CNG ringing signal of Hz is a single frequency signal and noise of the same frequency may be input, it is reliable to configure it to connect to the fax terminal port if the same signal is received twice. It is increasing the nature. When neither the PB signal nor the CNG ringing signal is received, it is judged whether or not the elapsed time from the loop closing reaches the monitoring time T (for example, 7 seconds) (step), and the monitoring time T is reached. If not, return to the step again. As a result, the reception of the PB signal and the CNG calling signal is monitored again. This operation is repeated until the monitoring time T elapses, and if neither the PB signal nor the CNG ringing signal is received even after the monitoring time T elapses, the telephone line is used by the user as a port when nothing is specified. Is connected to a preset default port (step).

[Problems to be Solved by the Invention]

In such a conventional multi-terminal control device, the T time, which is the monitoring time, is set as follows. In other words, considering the CNG ringing signal, the CNG ringing signal is configured to have an ON period of 0.5 seconds and an OFF period of 3 seconds. sec is required, and 7 sec is required if detection can be performed twice to further increase certainty. Therefore, the monitoring time T is normally 7 seconds. By the way, the charging of telephone charges is started from the loop closing response. If there is neither PB signal nor CNG ringing signal, the processing operation can be started only after 7 seconds.Therefore, unnecessary charges are made for the calling side at this time, and it is considered that the telephone network is invalidly used. Was becoming. In view of the above, it is an object of the present invention to provide a multiple terminal control device that suppresses unnecessary charges and reduces invalid use of the telephone network.

[Means for solving problems]

The monitoring time for confirming the reception of the selected incoming signal after closing the loop in response to the calling signal from the calling side is individually set according to the type of the selected incoming signal.

[Work]

By setting the monitoring time according to the type of the selected incoming call signal, it is possible to start the operation of the next stage and subsequent steps as soon as possible.

Examples of the invention

FIG. 1 is a block diagram showing the configuration of a multi-terminal control device according to the present invention. In the figure, 1 is a telephone line, 2 is an extension telephone used as a default port, 3 is a facsimile, 4 is another extension telephone, 5 is a network control circuit, 6 is a call signal IR generation circuit, and 7 is a CNG signal detection circuit. , 8 is a PB signal receiving circuit, 9 is a PB signal / frequency generating circuit, 10 is a voice synthesis generating circuit, 11 is a CPU, 12 is a polarity detecting circuit, 13 to 15 are loop detecting circuits, and 16 to 20 are switching contacts. ing. FIG. 2 shows an operation flowchart of the multi-terminal control device according to the present invention, and the present invention will be described in detail below with reference to FIGS. 1 and 2. First, when a calling signal is transmitted from the calling side, the calling signal is sent via the telephone line 1 and the polarity of the telephone line 1 is reversed. This polarity reversal is the polarity detection circuit
Detected by 12. When the signal from the polarity detection circuit 12 and the ringing signal are detected (step), this ringing signal is a ringing signal IR of 16 Hz, or a CNG ringing signal of, for example, 1300 Hz (having a predetermined duration, for example, 2.2 sec or more. Signal) is determined (step), and if the call signal IR is 16 Hz, the loop is closed and a response is made to the calling side (step). This loop closure (response) causes CPU11
Starts time monitoring, starts the timer (step), and PB 1.2 seconds after the loop is closed (response).
1100Hz signal (input guidance) by the signal generation circuit 9
Is sent to the originating side for 80 msec (step). After the loop is closed (response), the PB signal receiving circuit 8 and the CNG signal detecting circuit 7 start monitoring the PB signal and CNG signal, respectively. In such a state, for example, when the calling side hears the input guidance and sends out "3" as the PB signal designating the third port to which the extension telephone 4 is connected, the PB signal is received by the PB signal receiving circuit 8. It is detected and notified to the CPU 11 (step). As a result, the CPU 11 connects the port designated by the PB signal by closing the switching contact 18 of the third port to which the extension telephone 4 is connected (step), and the "voice call" from the voice synthesis generation circuit 10. Talking, the switch contact 19 is closed to the call signal generating circuit 6 side, and this circuit is activated to call the extension telephone 4. At the same time, the PB signal / single frequency signal generation circuit 9 sends a ringing tone to the calling side. Similarly,
1100Hz from the sender, ON period 0.5sec, OFF period 3sec
When a CNG ringing signal configured so that
This CNG calling signal is detected by the CNG calling signal detection circuit 7 and notified to the CPU 11 (step). When neither the PB signal nor the CNG ringing signal is received, the CPU 11 determines whether or not the elapsed time after the loop closing is performed has passed the monitoring time T1 (step), and the elapsed time has not passed. For example, returning to the step again, the PB signal and the CNG calling signal are monitored. If neither the PB signal nor the CNG ringing signal is received after the lapse of the monitoring time T1, the CPU 11 closes the connection contact 16 of the first port which is predetermined with the telephone line 1 as the default port. Connection to the default port (step) and switching contact
19 is closed to the calling signal generating circuit 6 side, and this circuit is activated to call the extension telephone set 2. When the DC loop is detected by the loop detection circuit 13 and the response from the extension telephone 2 is detected, the switching contact 19 is switched to the telephone line 1 side and the switching contact 20 is closed to connect the extension telephone 2 and the telephone line 1. Then
Make calls available. In this case, the monitoring time T1 is set to 3.5 seconds because it is the time required to receive the CNG ringing signal at least once. Therefore, if neither the PB signal nor the CNG ringing signal is received, it will be connected to the default port after 3.5 seconds, and unnecessary charging can be completed in only 3.5 seconds. In this case, since it is only necessary not to charge, it is of course possible to disconnect the line instead of connecting to the default port. In the case of a CNG ringing signal that is configured to have an ON period of 0.5 sec and an OFF period of 3 sec with a 1100 Hz signal, as a port of the fax terminal 3 at the first reception in the step to improve reliability. Second predetermined
When the CNG ringing signal is received for the second time without connecting to the second port (step), the connection contacts 17 and 20 are closed, and the switching contact 19 is switched to the telephone line side, whereby the fax terminal 3 and the telephone line are connected. 1 and 1 are connected (step). The second reception of the CNG ringing signal is monitored until the time T2 has elapsed after the loop was closed (response) (step), and the CNG ringing signal is received even after this monitoring time T2 has elapsed. If not, the connection to the default port is made as described above (step). In this case, the monitoring time T2 must be a time at which the CNG ringing signal can be received at least twice, so it is set to 7 seconds. In the above description, the CNG ringing signal is, for example, 1
Since the target is an ON period of 0.5 sec and an OFF period of 3 sec at 100 Hz, the reliability is improved by monitoring that the CNG ringing signal is received twice. Single-tone signal as a signal (a signal that continuously transmits a fixed frequency, for example, 1300 Hz for 10 seconds or more)
In such an F network calling signal, the signal continuation time exceeds a predetermined time, so that the fax terminal port is connected to the telephone line to improve reliability. Therefore, when such an F network calling signal is input, a signal of 1300 Hz is detected in the step of FIG. 2, so that the monitoring of the signal continuation time of this F network calling signal is started and the timer is started. (Step). Then, it monitors whether or not the signal continues (step), and monitors whether or not the elapsed time during this monitoring exceeds a preset monitoring time T3 (step). This monitoring time T3 is set to 2.5 sec, for example. If the signal does not continue before the monitoring time T3 has elapsed since the reception of this F network calling signal, this signal is regarded as noise and the process returns to the step to detect the calling signal. Will be in a standby state.
When the elapsed time reaches the monitoring time T3, the switching contacts 17 and 20 are closed and the switching contact 19 is switched to the telephone line side to connect the fax terminal 3 and the telephone line 1 (step). In the case of this F-network calling signal, since no charge is made for the signal continuation monitoring time, there is no problem of unnecessary charge,
Of course, in order to improve the reliability as the CNG calling signal, instead of receiving twice, when the signal continues for a predetermined time, the signal duration may be monitored. Further, although the PB signal and the CNG ringing signal are described as the selective incoming signal in the above description of the embodiment, it goes without saying that other signals may be targeted, and,
The value and the number of monitoring times can be appropriately determined according to the type of the selected incoming signal.

【The invention's effect】

According to the present invention, since the monitoring time for confirming the reception of the signal is set according to the type of the selected incoming signal, the operation of the next stage and thereafter can be started as soon as possible, and the charging time Can be shortened to reduce unnecessary charges and avoid invalid use of the telephone network.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a multi-terminal control device according to the present invention, FIG. 2 is an operation flowchart of an embodiment of a multi-terminal control device according to the present invention, and FIG. 3 is a conventional multi-terminal control. 3 shows an operation flowchart of the apparatus. 1 ... telephone line, 2,4 ... extension telephone, 3 ... facsimile terminal, 5 ... network control circuit, 6 ... call signal IR generation circuit, 7 ... CNG ring signal detection circuit, 8 ... PB signal Receiver circuit, 9 ... PB signal / single frequency signal generation circuit, 10 ... Speech synthesis generation circuit, 11 ... CPU, 12 ... Polarity detection circuit, 13,
14,15 …… Loop detection circuit, 16,17,18,19,20 …… Switching contacts.

Claims (2)

[Claims] 1. A plurality of extension connection terminals can be accommodated in one telephone line, and the extension connection terminal can be specified and connected to the telephone line according to a selected incoming call signal from a calling side. In a multi-terminal control device, a counting unit that counts an elapsed time after responding to a calling signal from a calling side and a setting that individually sets a monitoring time for confirming reception of the selected incoming signal according to a type of the incoming signal Means and a comparing means for comparing the monitoring time of the setting means with the elapsed time of the counting means, and when the selection incoming signal satisfying the condition defined by the monitoring time is received, the selection is performed. A multi-terminal control device, wherein the extension connection terminal specified by an incoming signal is connected to the telephone line. 2. The multi-terminal control device according to claim 1, wherein a signal composed of a plurality of frequencies and a signal composed of a single frequency are used as the selective incoming signal. For a signal by frequency, reception is validated because it was received multiple times, a monitoring time is set for each reception, and if each reception is performed within the monitoring time, it is specified by the signal. A multi-terminal control device, wherein the extension connection terminal is connected to the telephone line.