JPH07240769A - Communication control equipment - Google Patents

Abstract

PURPOSE:To provide communication control equipment is by which a piece of equipment in which inconvenience occurred capable of restarting communication with high reliability. CONSTITUTION:When the interruption of the call of the equipment performing the communication via an INS net continues for a fixed time. a microprocessor 25 makes an interruption/restart timer 24 complete before a timer on a net side is completed. A restart procedure and an interruption procedure are executed successively by such completion, and interruption time is extended by restarting the timer on the net side and the interruption/restart timer.

Description

Detailed Description of the Invention

[0001]

The present invention relates to NTT ISDN (I
ntegrated Services Digital
INS Net 64 (INS is the Information Network System)
The present invention relates to a communication control device that performs communication via m). More specifically, when a device communicating through the INS net 64 has to interrupt the communication due to a change in the connection location or the like, the interruption time can be extended without disconnecting the communication line of the device. The present invention relates to such a communication control device.

[0002]

2. Description of the Related Art FIG. 7 is a conventional configuration diagram of a communication system using an INS net 64. In FIG. 7, 1 is IN
The S-net 64. The INS net 64 has a D channel and B1 and B2 channels. The D channel is
It is a channel that transmits a control signal for connecting or disconnecting a device to or from a communication channel. The B1 channel and the B2 channel are communication channels themselves.
2 to 5 are in-home wiring connected to the INS net 64 1.
6 to 11 are devices connected to the in-home wirings 2 to 5. 1
Up to 8 devices can be connected to the home wiring of a book. The devices 6 to 11 include a host computer and an INS I / F.
Some are composed of circuits (I / F is an interface) and some are composed of only terminal equipment. When the device makes a call, D
The device is connected to the B1 and B2 channels using the channel, and the connection is established. Communication is performed between the two devices with which the connection has been established via the INS net 64.

The INS net 64 provides a function of moving equipment during communication. The in-communication device move function temporarily suspends the call of the device during communication, resumes communication by using the device connected to another jack on the same house wiring instead, or switches the device to another jack. This is a function used when communication is restarted by replacing with. INS Net 64
The exchange has a timer on the network side. The timer on the network side counts the interruption time when the device in communication interrupts the call. If the interruption continues until the timer on the network side expires, the communication line of the device that interrupted the call is disconnected.
Thus, the call interruption is monitored by the timer on the network side. In the communication system of FIG. 7, for example, if the host computer C cannot be used due to some trouble while the host computer C and the host computer D are communicating with each other, the call of the host computer C is temporarily suspended and the host computer A suspends the call. By restarting the existing call, communication can be restarted without disconnecting the line. However, the interruption of the call of the equipment is monitored by the timer on the network side, and the call cannot be interrupted beyond the set time of this timer. Therefore, when the interruption time exceeds the set time, the communication line of the device that is interrupting the call is temporarily disconnected, and it is necessary to reconnect the device when the call is resumed. The reconnection was not guaranteed to succeed. This is because if another device is using the communication channel when trying to reconnect, the reconnection may fail.
Therefore, there is a problem in that the reliability of the defective device when the communication is restarted is lowered.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and by prolonging the interruption time without disconnecting the line, the device in which the malfunction has occurred is highly reliable. It is an object of the present invention to realize a communication control device capable of resuming communication with.

[0005]

According to the present invention, an INS net 64 is used for at least a part of a communication line, a device making a call is connected to the communication line, and I
When communication is performed through the NS net 64 and the device interrupts the call, the timer on the network side counts the interrupt time, and when the timer on the network side times out, the communication line of the device that interrupted the call is disconnected. In the communication system configured as described above, when the suspend / resume timer having a set time shorter than the set time of the timer on the network side and the device in communication are monitored and the device recognizes that the call is interrupted. Is an interruption recognizing means for activating the interruption / resumption timer, a restart recognizing means for observing a device in communication and stopping the interruption / resumption timer when the device recognizes that a call is resumed, and the interruption / resumption
When the restart timer times out, a restart request message is sent to the INS net 64, a restart confirmation message is received from the INS net 64, and a suspend request message is sent to the INS net 64 successively. The communication control device comprises: a timer on the network side and an interrupt / restart timer restarted by receiving an interrupt confirmation message from the device, and an interrupt extender for extending the interrupt time.

[0006]

According to the present invention as described above, when the interruption continues for a certain period of time or more, the interruption / restart timer is timed up before the timer on the network side is timed up. Due to this time-up, the restart procedure and the suspend procedure are continuously executed, and the timer on the network side and the suspend / resume timer are restarted to extend the suspend time.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. Figure 1
FIG. 1 is a configuration diagram showing an embodiment of the present invention. The communication control device shown in FIG. 1 is provided for each device on the in-home wiring.
In FIG. 1, 20 is a home wiring connected to the INS net 64, 21 is an ISDN control unit connected to the home wiring 20 and controlling an ISDN protocol, 22 is a channel bus control connected to a channel bus 23 and controlling a channel bus protocol. Part 24 is a suspend / resume timer having a setting time shorter than the setting time of the timer on the network side. The channel bus 23 is a bus that connects various cards inserted in the slots of the device and the host computer. Reference numeral 25 is a microprocessor that controls the interruption / resumption timer and the entire communication control device. Microprocessor 25
Then, 251 monitors the device in communication, and when the device recognizes that the call is interrupted, an interruption recognition unit that activates the interruption / resumption timer 24. 252 monitors the device in communication and the device detects the call. It is a restart recognition means for stopping the suspend / restart timer 24 when it is recognized that the restart / restart is performed. Reference numeral 253 is an interruption extension means, which extends the interruption time of a call to cause an interruption / restart timer 2
4 has timed out, the timer on the network side is restarted by continuously executing the resumption procedure and the interruption procedure using the call identifier stored in the interruption recognition means 251.
Extend the interruption time. Further, the interruption extension means 253 also restarts the interruption / restart timer 24 when the interruption time is extended. Reference numeral 254 denotes a communication restarting means, which restarts the interrupted call and restores communication in response to a request from the host computer. Also, the communication resuming means 254 stops the suspend / resume timer 24 when the call is restarted. Data buses and address buses 26 and 27 are connected to the ISDN control unit 21, the channel bus control unit 22 and the microprocessor 25. Reference numeral 28 is an interrupt signal line that connects the suspend / resume timer 24 and the microprocessor 25. Interruption /
The restart timer 24 uses the interrupt signal line 28 to interrupt the microprocessor 25 when the time is up.

The operation of the communication control device thus configured will be described. 2 to 6 are flowcharts showing the operation procedure of the apparatus of FIG. The features of the present invention are the processing of the portion surrounded by the broken line in FIG. 2 and the processing shown in FIGS. The communication control device according to the present invention constantly monitors the message regarding interruption and confirmation transmitted from the INS net 64. The device issues the interruption request message, and the exchange in the INS net 64 issues the interruption confirmation message. When the device on the in-home wiring makes a call interruption request, and as a result, the interruption is completed, the switch of the INS net 64 issues an interruption confirmation message to the device. When the communication control device receives the interruption confirmation message from the INS net 64, the communication control device considers that one of the devices on its own home wiring has executed the call interruption, and the interruption / resumption timer 2
Start 4. The set time of the suspend / resume timer 24 is set shorter than the set time of the timer on the network side. For example, if the set time of the timer on the network side is 180 seconds, the set time of the suspend / resume timer 24 is set to 150 seconds. With this setting, the sequence for interruption and confirmation is activated before the timer on the network side expires. Further, when the device on the in-home wiring requests the resumption of the call, and as a result, the resumption of the call is completed, the exchange of the INS net 64 issues a resumption confirmation message to the device. Communication control device is INS
When you receive a restart confirmation message from Net 64,
The suspend / resume timer 24 is stopped when it is determined that any of the devices on the home wiring has resumed the suspended call. When the time is up, the suspend / resume timer 24 uses the interrupt signal line 28 to notify the microprocessor 25 of the time up. At this time, the interruption / resumption timer 24 executes interruption and interruption processing. That is, when the suspend / resume timer 24 times out, the communication control device once transmits a restart request message to the INS net 64 and receives a restart confirmation message from the INS net 64 in order to further extend the suspend time. . After that, the interruption request message is continuously transmitted again to the INS net 64, and the IN
The interruption confirmation message is received from the S-net 64. Through this series of operations, the INS net 64 side recognizes that the interruption has occurred again, and restarts the timer on the network side. This allows the interruption time to be extended. When a communication restart request is received from the host computer, a restart request message is sent to the INS net 64, and a restart confirmation message is received from the INS net 64. This allows the device on the in-home wiring to restart the call and continue the interrupted communication. In the flowcharts of FIGS. 2 to 6, Q931 is a packet protocol for controlling connection and disconnection of lines (call control) in ISDN. This protocol is OSI (Open
It is provided in the third layer of the Systems Interconnection model. Q921 is a link layer protocol of a call control channel (D channel) in ISDN, which is also called LAPD. This protocol is provided in the second layer of the OSI model. The interruption-related messages include an interruption request message, an interruption confirmation message, and an interruption refusal message. The restart-related messages include a restart request message, a restart confirmation message, and a restart reject message.

[0009]

According to the present invention, when the interruption continues for a certain period of time or more, the interruption / resumption timer is timed up before the timer on the network side expires, and the resumption procedure and the interruption procedure are continuously executed. However, since the timer on the network side is restarted, the interruption time can be extended without disconnecting the line. As a result, some trouble occurred in the device during communication, and when performing recovery work, it was possible to hold the call during communication until the recovery work was completed, and it was interrupted when the recovery work was completed. You can resume the call. Therefore, the defective device can restart communication with high reliability.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart showing an operation procedure of the apparatus of FIG.

3 is a flowchart showing an operation procedure of the apparatus of FIG.

FIG. 4 is a flowchart showing an operation procedure of the apparatus of FIG.

5 is a flowchart showing an operation procedure of the apparatus of FIG.

6 is a flowchart showing an operation procedure of the apparatus of FIG.

FIG. 7 is a conventional configuration diagram of a communication system using an INS net 64.

[Explanation of symbols]

 1 INS Net 64 20 Home Wiring 21 ISDN Control Unit 24 Suspend / Resume Timer 25 Microprocessor 251 Suspend Recognition Means 252 Resume Recognition Means 253 Suspend Extension Means

Claims (1)

[Claims] 1. An INS net 64 is used for at least a part of a communication line, a device that makes a call is connected to the communication line, and the connected devices communicate with each other via the INS net 64. When a call is interrupted, a timer on the network side counts the interruption time, and when the timer on the network side times out, in the communication system configured to disconnect the communication line of the device that interrupted the call, the network side Interruption / resuming timer having a setting time shorter than the setting time of the timer, and interruption recognizing means for activating the interruption / resumption timer when the equipment in communication is monitored and the equipment recognizes that the call is interrupted. And a restart recognizing means for monitoring the communicating device and stopping the suspend / resume timer when the device recognizes that the call is resumed, and restarting when the suspend / resume timer times out. Send a determined message to the INS Net 64 receives the resume confirmation message from the INS Net 64, the interrupt request message and sends it to the INS Net 64 consecutive thereto,
A communication control device comprising: an interruption extension means for restarting a timer on the network side and an interruption / resumption timer by receiving an interruption confirmation message from the INS net 64 to extend the interruption time.