JPH04137848A - Communication management equipment - Google Patents

Abstract

PURPOSE:To allow a terminal equipment to always receive a regular polarity inversion signal by inverting the polarity of a bypass means and connecting it to the terminal equipment when it is discriminated that the polarity of a telephone line at loop closing is inverted. CONSTITUTION:A control circuit 2 receives a polarity inversion signal depending on the response of an opposite party via a DC loop incoming call polarity inversion detection circuit 6 after the end of transmission of a dial signal. When a telephone line terminal L1 at DC loop closing is at a negative level, a relay C in a relay circuit 8 is driven to close a contact (c) and relays A, D in the relay circuit 8 are driven to release relay contacts a, d thereby connecting the telephone line and the terminal equipment 1 through a bypass 11. Thus, the terminal equipment always receives a regular polarity inversion signal from the telephone line and malfunction attended with the reception of the polarity inversion signal is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a communication management device that is connected between a telephone line and a terminal device and manages relaying and communication therebetween.

"Prior Art J" Conventionally, terminal devices connected to this type of communication management device were
If you close the loop by paying the communication fee when making a call and then manipulate the dial number of the other party's device, this will be detected by the communication management device. The communication management device inputs these signals to close a DC loop of the telephone line, and also sends a dial signal corresponding to the input dial number to the telephone line. Then, the communication management device detects the polarity inversion signal from the telephone line and identifies the response of the other party's device, and based on the identification result of this communication management device, the terminal device initiates a call with the other party's device via the telephone line. and initiate communication.

[Problems to be Solved by the Invention] However, the above-mentioned terminal device is equipped with a function of directly detecting a polarity inversion signal from a telephone line to identify a response from the other party and automatically communicate with the other party's device. In some cases, a communication management device that accommodates such a terminal device is connected to telephone line terminal L1. ．． ．． If the polarity of L2 is set to the correct terminal, can the other party's response be detected normally? For example, if the polarity of L2 is reversed, check whether the terminal equipment can detect the other party's response normally. cannot detect polarity reversal, and therefore, in this case, there is a problem that the device malfunctions and automatic communication with the other device cannot be performed.

[Means for Solving the Problems] In order to solve such problems, a communication management device according to the present invention includes bypass means for transmitting a polarity inversion signal from a telephone line indicating a response from a called party to a terminal device; A polarity determining means for determining the polarity of a telephone line that has been looped open in response to a loop closing signal from a terminal device, and a polarity determining means for determining the polarity of the telephone line when the polarity determining means provided in the bypass means determines that the polarity of the telephone line has been reversed. Bypass polarity reversing means for reversing the polarity.

[Operation] If the polarity determining means determines that the polarity of the telephone line at the time of loop closure is reversed, the polarity of the bypass means is controlled to be reversed, and the bypass means whose polarity has been reversed is connected to the terminal device. As a result, the terminal device:
Regular polarity inversion signals can always be received.

[Example] Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of a main part of a communication management device according to the present invention. Note that this communication management device is a device that is connected between a telephone line and a terminal device 1, which will be described later, and manages communication charges and the like when the terminal device 1 communicates using the telephone line. In the figure, 1 is a terminal device that is connected to this communication management device and performs calls and communications with a partner device via a telephone line, 2 is a control circuit that controls the communication management device, and 3 is a terminal device that is closed by the terminal device 1. 4 is a current supply circuit that supplies current to the terminal device 1,
5 is a line protection circuit that protects the device from noise, overvoltage, etc. from the telephone line, and 6 is a DC loop that detects incoming signals coming from the telephone line to the terminal device 1 and detects polarity reversal due to phase response.・Incoming call/polarity reversal detection circuit, 7
is a DC loop dial control circuit that closes the DC loop of the telephone line and sends a dial signal to the telephone line when the loop closure of the terminal device and a dial signal are detected; 8 is a relay circuit; 9 is a closed loop; 10 is a display circuit that performs various displays; 11 is a bypass that notifies the terminal device 1/\ of a polarity reversal signal when the other party answers. In addition, ks is a special key contact for making a call in response to an incoming call during a power outage, a, b, c, and d are contacts of each relay, Tl
, T2 is a transformer, DB is a diode bridge, C1~
C3 is a capacitor, and R is a resistor. Next, the operation of the communication management device configured as above will be explained.

When this communication management device becomes energized, the control circuit 2
The relay circuit 8 is driven to switch the relay contact d to the DC loop/dial detection circuit 3 side. As a result, current is supplied to the terminal device 1 by the current supply circuit 4.

In such a state, when an incoming call arrives from the telephone line via the telephone line terminals L1L2, this incoming call is detected by the DC loop/incoming polarity reversal detection circuit 6 and sent to the control circuit 2. The control circuit 2 drives the relay circuit 8 based on this incoming signal and changes the relay contact A to the contact a.
When the control circuit 2 detects a response to the incoming call from the terminal device 1 via the DC loop/incoming polarity reversal detection circuit 6, the control circuit 2 recognizes it as a call state. Thereafter, the terminal device 1 monitors the end of the call via the DC loop/incoming call/polarity reversal detection circuit 6, and if the end of the call is detected, the call end process is executed.

Next, the calling operation of the terminal device 1 will be explained.

When the communication management device is in an energized state, a coin is inserted in order for the terminal device 1 to make a call, and the control circuit 2 is connected to the relay circuit 8.
is driven to switch the relay contact d to the DC loop/dial detection circuit 3 side, and current is supplied to the terminal bag W1. When the loop is closed due to off-hook, the control circuit 2 detects this via the loop dial detection circuit 'R3, and sends a dial tone to the terminal device 1 via the transformer T2 and capacitors C2 and C3. . Subsequently, when a dial signal is sent from the terminal device 1, this dial signal is detected by the loop dial detection circuit 3 or the transformer T2, and the lowest communication charge corresponding to this dial number is calculated. If the calculated fee is greater than the amount of coins inserted, a request is made to insert additional coins, but if the amount of coins inserted is greater, the relay circuit 8 is driven to contact a. is switched to the diode bridge DB side and the contact A is switched to the contact A side, and the DC loop dial sending control circuit 7 is controlled to close the DC loop of the telephone line. At this time, which of the telephone line terminals LI and L2 is switched It detects and stores whether the terminal side is at a positive potential, and automatically sends a dial signal corresponding to the input dial number to the telephone line.

After the transmission of the dial signal is completed, the control circuit 2 connects the transformers Tl and T2, and causes the terminal device 1 to listen to a ringback tone indicating that the other party is calling from the telephone line or a busy tone indicating that the other party is busy, When the other party is calling, a polarity inversion signal due to the other party's response is detected via the DC loop/incoming call/polarity inversion detection circuit 6. When the other party's response is detected, if the telephone line terminal L1- is at a negative potential when the DC loop is closed, the relay PJI@8
While driving the inner relay C to make the contact C,
Drives relay AD in relay circuit 8 to connect relay contacts a,
By restoring d and connecting the telephone line and the terminal device 1 via the bypass 11, control is performed to reverse the polarity of the terminals LL and L2 as seen from the terminal device 1 side. Notify response (polarity reversal). As a result, the control circuit 2 collects the unit communication charge every predetermined time,
If there is a shortage, processing such as controlling the buzzer 9 to send out a reminder sound is performed. In this way, calls and communications are carried out with the other party's device, and the completion of these is then monitored. , the control circuit 2 determines the end of the communication based on the loop release signal of the terminal device 1 detected by the DC loop/incoming call/polarity reversal detection circuit 6, and executes call termination processing when the loop is released.

Next, the detailed operation of the control circuit 2 of this communication management device will be explained based on the flowchart of FIG. As described above, this terminal device 1 has the function of detecting the polarity reversal of the telephone line after sending a dial signal via the telephone line, identifying the other party's response based on this polarity reversal, and automatically communicating with the other party's device. It is equipped with a telephone line terminal Ll for telephone construction etc.
, L2, the other party's response cannot be detected. In order to solve such problems, the communication management device of the present invention is designed to be able to transmit a normal polarity reversal signal to the terminal bag W1 no matter what the polarity of the telephone line terminal is. FIG. 2 is a flowchart explaining the detailed operation during this time.

That is, first, the relay circuit 8 is driven and the relay contact d
When the current is switched to the loop dial detection circuit 3 side and current is supplied from the current supply circuit 4 to the terminal device 1, in step 50, the terminal device 1 goes off-hook and a dial signal is sent by subsequent dial key operation, etc. The transmission processing is performed and these signals are detected by the loop dial detection circuit 3 or the transformer T2. In step 51, the relay circuit 8 is driven to connect the relay contact a to the diode bridge DB@, and Switch the relay contacts to contacts alljl, control the DC loop/dial sending control circuit 7 to close the DC loop of the telephone line, and change the polarity of the telephone line terminals Li and L2 to the DC loop/incoming call/polarity. Detection is performed based on the detection output of the inversion detection circuit 6, and then the DC loop and dial transmission control circuit 7 are controlled to transmit the dial signal received from the terminal device I to the telephone line.

Next, the polarity of the loop detected in step 51 is determined (step 52), but if the telephone line terminal L side has a positive potential and the polarity is normal as determined as "Y" in step 52, , in step 53, the telephone line terminal L1. (Detection of polarity reversal in which s becomes negative potential (telephone line terminal L2 side is positive potential), that is, the response of the other party is monitored, and when polarity reversal is detected, ry,
If it is determined that Sends an inversion signal (polarity reversal signal) to the terminal device 1.

Further, if the telephone line terminal L1 side is at a negative potential when the DC loop is closed and the determination is "N" in step 52, the detection of polarity reversal in which the telephone line terminal LI11J becomes a positive potential is monitored in step 55. , the other party responds, and as a result, if a polarity reversal such that the terminal L1 side becomes a positive potential is detected and the determination is "Y" in step 55, the relay C in the relay circuit 8 is driven in step 56. Then, the contact C is made, and the potential of the two-wire jump of the bypass 11 is controlled to be reversed, and the process moves to step 54. Then, in step 54, the relays A and D in the relay circuit 8 are driven to restore the relay contacts a and d, and the telephone line and the terminal device 1 are connected via the bypass 11 in which the potential between the lines is reversed. As a result, a normal polarity inversion signal, that is, a polarity inversion signal in which the telephone line terminal L1 has a negative potential, can be sent to the terminal device 1. As a result, when the called party answers, a normal polarity inversion signal is always sent to the terminal device 1, and the terminal device W1 can reliably detect the other party's response.

[Effects of the Invention] As explained above, the communication management device according to the present invention reverses the polarity of the bypass means when the polarity determination means determines that the polarity of the telephone line at the time of loop closure is reversed. As a result, the terminal device can always receive a regular polarity reversal signal from the telephone line, and as a result, malfunctions due to reception of the polarity reversal signal can be prevented, and automatic communication with the other device, etc. This has the effect of making it possible.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a communication management device according to the present invention, and FIG. 2 is a flowchart explaining the operation of this device. ] −・Terminal device, 2・・Control circuit, 3・−1・Loop dial detection circuit, 4° current supply circuit, 6・・
DC loop/incoming polarity reversal detection circuit, 7--DC loop dial control circuit, 8... relay circuit, 9 buzzer, 10...- display circuit, 11 bypass, KS special key contact, a, b, c,
d--Relay contact, Tl, T2 ・Transformer, D
B...Diode bridge, C1-C3...Capacitor. Patent applicant: Tamura Electric Manufacturing Co., Ltd. Nippon Telegraph and Telephone Corporation

Claims (1)

[Scope of Claims] A communication management device that is connected between a telephone line and a terminal device and manages relaying and communication between the telephone line and the terminal device, comprising: a polarity signal from the telephone line indicating a response from the other party; bypass means for transmitting an inverted signal to the terminal device; polarity determination means for determining the polarity of the loop-closed telephone line in response to a loop-closing signal from the terminal device; and a polarity determination means provided in the bypass means. A communication management device comprising bypass polarity reversing means for reversing the polarity of the bypass means when the polarity determining means determines that the polarity of the telephone line has been reversed.