JPH10322461A - Communication equipment and its control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain control with high reliability and high stability by resetting the communication equipment to an initial state depending on a 1st ring signal from a subscriber telephone line so as to conduct resetting automatically and quickly. SOLUTION: A ring signal detection section 102 detects a ring signal from a subscriber telephone line, and when a ring reset section 103 detects a first ring pulse, the section 103 sends a modem reset signal RST to a modem control section 104 and each circuit in a modem. When the initializing of the modem is finished, the modem control section 104 returns the initializing end notice to the ring reset section 103. Thus, the ring reset section 103 sends a ring signal RING in a form of 2nd and succeeding ring pulses to the modem control section 104 to start usual ring reception and incoming call operation. When the incoming call is finished or the communication is terminated, the modem control section 104 sends the ring reset initializing signal to the ring reset section 103, which is restored to the initial state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication device connected to a subscriber's telephone line, and more particularly to a control method of a communication device such as a modem (hereinafter, referred to as a modem) and a communication device employing the control method. .

[0002]

2. Description of the Related Art A modem for a subscriber telephone line is generally reset by a power-on reset at power-on, a reset switch being pressed, or an interface signal (ER signal) with a data terminal (DTE). Have been done.

Japanese Patent Application Laid-Open No. Hei 7-212489 discloses a method of counting the number of ringers generated on a subscriber telephone line and resetting the modem when the counted value exceeds a predetermined number. I have.

[0004]

However, when the above-mentioned conventional modem is installed on the information center side, that is, on the side where an access point of a terminal is provided and a large number of modems of the same type are installed, continuous operation is often performed. In addition, since the center station may be unmanned, it is difficult to perform maintenance and inspection appropriately, and it is not possible to respond promptly even if there is an abnormality in the modem. That is, to recover the modem,
There is no method other than resetting by turning off the power of the modem on the center side or turning on / off the interface signal (ER signal) by the DTE on the center side.

Further, in the method of counting the number of ringers and resetting the modem when the number exceeds a predetermined number, the modem waits only for a predetermined time before the modem is recovered, so that quick recovery cannot be performed. Further, when the oscillating modem performs a calling operation using the dial abort timer, the dial abort timer expires while counting the number of ringers, and the line connection may not be established.

SUMMARY OF THE INVENTION An object of the present invention is to provide a control method for automatically and quickly resetting a communication device to improve the stability and reliability of the communication device, and to provide a communication device provided with the control method.

[0007]

SUMMARY OF THE INVENTION A communication device and a control method thereof according to the present invention detect a first ring signal from a subscriber telephone line and control the communication device in accordance with the first ring signal. Resetting to an initial state.

According to the present invention, when a ring signal is generated on the subscriber's telephone line, the inside of the communication device is reset by the first ring signal, and after the reset is completed, the operation shifts to a normal ring reception and reception operation. For this reason, each time a ring signal is received, the communication device is quickly reset and returns to the initial state, and stable operation is guaranteed without frequent maintenance.

[0009]

FIG. 1 is a schematic block diagram showing the internal configuration of a modem as an embodiment of a communication device according to the present invention. Telephone line port 101 connected to the subscriber telephone line
Is connected to a line controller (not shown) and a ring signal detector 102. A ring signal detection unit 102 detects a ring signal from the subscriber's telephone line and a ring reset unit 103
Output to As will be described later, the ring reset unit 103 sends a modem reset signal RST for resetting the entire modem to the modem control unit 104 and other circuits in the modem upon detecting the first ring pulse (1st).

When the initialization of the modem is completed, the modem control unit 104 returns an initialization completion notification to the ring reset unit 103. As a result, the ring reset unit 103 sends a ring signal RING to the modem control unit 104 by the second and subsequent ring pulses (2nd, 3rd,...), And starts normal ring reception and incoming call operation. When the incoming call ends or the communication ends, the modem control unit 104
Transmits a ring reset initialization signal to the ring reset unit 103
Send to The ring reset unit 103 returns to the initial state by this initialization signal, and repeats the above operation again when the next ring signal is generated.

FIG. 2 is a block diagram showing an example of the internal configuration of the ring reset unit 103 in the present embodiment.
The ring signal from ring signal detection section 102 is input to reset control section 201. When the input ring signal is the first ring, the reset control unit 201 outputs a reset signal transmission instruction to the reset signal generation unit 202, and sends the second and subsequent ring signals to the ring signal control unit 203. Output. The reset signal generation unit 202 generates a modem reset signal RST in accordance with the reset signal transmission command, and transmits it to the modem control unit 104 and other circuits in the modem.

The ring signal control unit 203 inputs an initialization completion notification sent by the modem control unit 104 when the initialization of the modem is completed. In response, ring signal control section 203 sends ring signal RING to modem control section 104 in accordance with the ring signal input from reset control section 201. The reset control unit 201 and the ring signal control unit 203 are initialized by a ring reset initialization signal input from the modem control unit 104 when the incoming call ends or the communication ends, and the system enters a ring signal waiting state.

Whether or not the reset control unit 201 is the first ring can be determined as follows using a flag, for example. If a ring is received when the flag is reset, it is determined that the ring is the first ring, and the flag is set by the first ring reception.
When the flag is set, it is determined that the ring is the second or later ring. Then, when the ring reset unit initialization signal is input from the modem control unit 104, the flag is reset to reset again.

FIG. 3 is a flowchart showing an embodiment of the control method according to the present invention. When the reset control unit 201 detects the first ring signal in a state of waiting for reception (step S301) (step S302), the transmission of the ring signal RING of the ring signal control unit 203 is stopped (step S303), and the reset signal is output. A reset signal transmission instruction is output to the generation unit 202 to output the modem reset signal R
ST is output (step S304). The ring signal RING is not transmitted until the initialization end notification is input from the modem control unit 104 (No in step S305, S
306).

When the initialization of the modem is completed (step S
(Yes in 305), the ring signal control unit 203 sends the ring signal RING to the modem control unit 104 (Step S).
307), thereby starting a normal incoming call and handshake operation (step S308), and shifting to a communication state (S309). When the communication is terminated and the line is disconnected (step S310), a ring reset unit initialization signal is output from the modem control unit 104, and the ring reset unit 1
03 is initialized as described above (step S31).
1) Return to the initial reception waiting state (step S301).

As described above, since the inside of the modem is reset by the first ring coming from the subscriber's telephone line, the modem is automatically and promptly set up for each incoming call without using the DTE on the information center side. It can be reset to the initial state. Especially, when various failures occur, such as when the modem does not respond to the ring signal, when the environment setting such as automatic incoming call setting of the modem has changed,
In order to return the communication device such as a modem to the initial state for each incoming call,
A stable and reliable operation can always be guaranteed.

Further, after the inside of the modem is reset by the first ring, the incoming call can be sufficiently received within the time of the dial abort timer of the modem on the oscillation side in order to shift to the incoming call operation, and a smooth line connection is performed. be able to.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram showing an internal configuration of a modem which is an embodiment of a communication device according to the present invention.

FIG. 2 is a block diagram illustrating an example of an internal configuration of a ring reset unit 103 according to the embodiment.

FIG. 3 is a flowchart illustrating an embodiment of a control method according to the present invention.

[Explanation of symbols]

 Reference Signs List 101 telephone line port 102 ring signal detection unit 103 ring reset unit 104 modem control unit 201 reset control unit 202 reset signal generation unit 203 ring signal control unit

Claims (10)

[Claims] 1. A method for controlling a communication device connected to a subscriber's telephone line, comprising: detecting a first ring signal from the subscriber's telephone line; and responding to the first ring signal. Reset to an initial state. 2. The control method according to claim 1, further comprising, after the reset, starting an incoming call operation in accordance with the second and subsequent ring signals of the ring signal. Further, after the reset is completed, an incoming call operation is started in response to the second and subsequent ring signals of the ring signal, and when a communication line is disconnected, a ring signal from the subscriber's telephone line is awaited. The control method according to claim 1, wherein the method returns to an initial state. 4. A communication device connected to a subscriber's telephone line, wherein a ring signal detecting means for detecting a first one of the ring signals from the subscriber's telephone line, and the first ring signal is detected. Reset signal generating means for generating a reset signal for resetting the inside of the communication device to an initial state; and after the reset of the inside of the communication device is completed, starting a ringing operation according to a second or subsequent ring signal. Control means for initializing the ring signal detecting means and the reset signal generating means when the line is disconnected. 5. The control method according to claim 1, wherein the communication device is connected to a data terminal device. 6. The control method according to claim 1, wherein said communication device is installed in an information center to which a plurality of data terminal devices are connected through a telephone line network. 7. The control method according to claim 5, wherein the communication device is a modem. 8. The communication device according to claim 4, wherein the communication device is connected to a data terminal device. 9. The communication device according to claim 4, wherein a plurality of data terminal devices are installed in an information center connected through a telephone network. 10. The communication device according to claim 8, wherein the communication device is a modem.