JPH03180950A - Computer system - Google Patents

Abstract

PURPOSE:To eliminate the interference of an operator and to prevent the restart of data reception from being delayed by monitoring a carrier detecting signal for deciding the existence of a fault in a receiving line which is applied to data obtained from the receiving line, and when the line is restored, automatically restarting the data reception. CONSTITUTION:The state of a carrier detecting signal is applied to data received by a communication control equipment 1 and transferred to a central processing unit(CPU)2. The CPU 2 receives the data to which the state of the carrier detecting signal is applied and controls the state of the carrier detecting signal transferred from the equipment 1 while referring a carrier detecting signal state control table. The carrier detecting signal is turned off (0) at the time of generating a fault, and turned off (1) at the time of restoration, so that reception can be automatically restarted at the time of turning the carrier detecting signal from OFF to ON. Thus, the data reception can be automatically restarted without the interference of an operator after restoring the fault of the line.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is used for automatic line recovery of a computer system. The present invention relates to a computer system that is equipped with a communication control device connected to a receiving line and capable of detecting a carrier detection signal, and is capable of automatically restarting the computer system after a faulty line is restored.

〔overview〕

The present invention is a computer system equipped with a communication control device and a central processing unit connected to a plurality of external systems. By assigning the presence or absence of a signal and transmitting it, and when the line is restored, this carrier detection signal is monitored and data reception is automatically resumed, eliminating operator intervention when data reception is resumed.
This is to reduce the delay in restarting.

[Conventional technology]

Conventionally, this type of line recovery method has blocked and closed the faulty line when a line failure has occurred, and resumed receiving by command input from the operator after the physical recovery work has been completed.

[Problem that the invention seeks to solve]

The conventional line restoration method described above requires operator intervention in order to resume reception upon input of a command from the operator, which has the disadvantage of delaying restart of data reception.

The present invention aims to eliminate such drawbacks, and aims to provide a system in which data reception can be resumed immediately after recovery from a failure.

[Means for solving problems]

The present invention relates to a communication control device that is connected to a plurality of reception lines connected to other systems via a modem, and has a data reception means, a communication control means, and a data transfer means, and a communication control device that is connected to a plurality of reception lines connected to other systems via a modem. In a computer system equipped with a central processing unit that processes data,
The communication control device includes carrier detection means for detecting a carrier for each receiving line, and means for adding the detection output of the carrier detection means to each received data, and the central processing unit includes means for capturing the added data as valid data and identifying a reception line to which the detection output is not attached as a failure; and a means for adding the detection output to the reception line identified as failure by the identification means. and means for activating failure recovery when a failure occurs.

Further, the central processing unit may include means for transmitting the output of the identifying means to an operator as a warning, and when the central processing unit receives data to which the detection output is not added, the central processing unit detects the data on the receiving line that received the data. It can include mode switching means for switching to a monitoring mode for monitoring the presence or absence of output.

[Effect]

The communication control device adds a carrier detection signal state to the received data and transfers the data to the central processing unit. The central processing unit receives the data to which the state of the carrier detection signal is assigned, and refers to the carrier detection signal state management table to manage the state of the carrier detection signal transferred from the communication control device. The carrier detection signal turns off (0) when a failure occurs, and turns on (1) when recovery occurs, so reception is automatically resumed upon this transition from off to on.

Thereby, data reception can be resumed automatically after recovery from a line failure without operator intervention.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a diagram showing the concept of the flank and operation of the embodiment of the present invention.

The embodiment of the present invention has a plurality of reception lines LNO1, SIN02, and LNO connected to other systems (not shown) via a modem M.
3, data receiving means, communication control means (not shown),
and a communication control device 1 having a data transfer means, and a central processing device 2 that processes data received via this communication control device 1. carrier detection means for detecting;
The central processing unit 2 is provided with means for adding the detection output of the carrier detection means to each received data, and the central processing unit 2 receives the data to which the detection output is added as valid data, and also connects the receiving line to which the detection output is not added. It includes means for identifying a failure, and means for activating failure recovery when a detection output is added for a receiving line identified as a failure by the identifying means.

Furthermore, the central processing unit 2 includes means for transmitting the output of the identifying means as a warning to an operator, and when receiving data to which no detection output is added, the central processing unit 2 determines whether or not there is a detection output for the reception line that received the data. mode switching means for switching to a monitoring mode for monitoring.

Next, the operation of the embodiment of the present invention configured as described above will be explained.

When data is transmitted via the modem M from another system not shown, the communication control device 1 receives the data and transfers the data to the central processing device 2.

When transferring data, the communication control device 1 reads out the state of the carrier detection signal from the modem M stored in the register as shown in FIG. 2, adds it to the data to be transferred, and transfers the data. This data transfer is performed by setting a timer.
This is done every 5ec timeout.

The central processing unit 2 receives data transfer, and as shown in FIG. 3, a management table 21 manages the state of the carrier detection signal.
The carrier detection signal added to the transferred data is compared with reference to the carrier detection signal, and if the line is normal (on-on), the data is processed, and if a failure has occurred (on-off), line monitoring is started. When the fault is recovered (off-on), data reception is resumed and the transferred data is recognized as valid.

Here, if a failure occurs in the receiving line LNOI,
The communication control device 1 adds the carrier detection signal OFF information read from the register to the data received before the failure occurs, and transfers the data to the central processing device 2.

After receiving this information, the central processing unit 2 processes the data up to the occurrence of the failure, then cancels the reception of line failure messages to the operator, and thereafter enters a monitoring mode in which only carrier detection signal information is received until recovery. Take.

During the monitoring mode, the communication control device 1 performs a reception operation for 7m5eC, reads the register, and continues the transfer, as in the normal state. When the receiving line LNOI is recovered, the communication control device 1 adds information about the carrier detection signal ON read from the register to the recovered received data and transfers it to the central processing device 2.

The central processing unit 2 cancels the monitoring mode, performs processing to resume reception of a line recovery message to the operator, and executes data processing after recovery.

[Effects of the Invention] As explained above, according to the present invention, the carrier detection signal added to the data from the receiving line to determine whether there is a fault in the line is monitored, and when the line is restored, the carrier detection signal is automatically detected. By restarting data reception, it is possible to eliminate operator intervention and eliminate delays in restarting data reception.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration and concept of an embodiment of the present invention. FIG. 2 is a flowchart showing the flow of firmware processing of the communication control device according to the embodiment of the present invention. FIG. 3 is a flowchart showing the flow of software processing of the central processing unit according to the embodiment of the present invention. 1... Communication control device, 2... Central processing unit, M...
・Modem, LNOI to LNO3...receiving line.

Claims (1)

[Claims] 1. A communication control device connected to a plurality of reception lines connected to other systems via modems, and having data reception means, communication control means, and data transfer means; In a computer system equipped with a central processing unit that processes data received via the communication control unit, the communication control unit includes carrier detection means for detecting a carrier for each receiving line, and a detection output of the carrier detection means. means for adding the detection output to each received data, and the central processing unit includes means for capturing the data to which the detection output is added as valid data and identifying a reception line to which the detection output is not added as a failure. and means for activating failure recovery when the detection output is added for a receiving line identified as having a failure by the identifying means. 2. The computer system according to claim 1, further comprising means for sending the output of the identifying means to an operator as a warning. 3. The central processing unit, when receiving data to which the detection output is not added, includes mode switching means for switching to a monitoring mode for monitoring the presence or absence of the detection output for the reception line that received the data. computer system.