JPH04315333A - Automatic line control system - Google Patents

Abstract

PURPOSE:To prevent deterioration in the transmission quality. CONSTITUTION:A line changeover section 2 switches two lines 5 to control through which line the data between data transmitters 6 is sent. A line monitor section 1 monitors the state of a line connecting to the data transmitter and when the transmission quality of the line is deteriorated, an alarm is raised. When the data transmitter 6 makes communication via a line 5a and when a line monitor 1a detects a phase hit, an alarm count section 3 counts how many alarms are sent from the same line within a prescribed time and controls the line switching section 2 when one alarm or over takes place for one minute to switch the line 5a between the data transmitters 6 into the line 5b.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic line control system in a data transmission system in which a plurality of data transmission devices are connected via a plurality of lines and one of the lines is selected for use.

0002

2. Description of the Related Art Conventionally, in this type of line control system, lines are switched when a serious failure is detected on a line.

0003

[Problem to be solved by the invention] In the conventional line control system, only when a serious failure such as a line disconnection occurs,
Automatic switching of lines was carried out, but automatic switching was difficult when the transmission quality of the line deteriorated.

0004

[Means for Solving the Problems] The automatic line control system according to the present invention provides a plurality of data transmission devices, a plurality of lines connecting the plurality of data transmission devices, and a line switching method for switching and selecting the plurality of lines. means, line monitoring means for monitoring the transmission quality of the line selected by the line switching means to detect a decrease in transmission quality, and line control means for controlling switching in the line switching means based on the detection result of the line monitoring means. has.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described in more detail with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention. The data transmission devices 6a and 6b are connected to the line 5a or 5b.
Data communication is performed via. The line switching units 2a, 2b switch the two lines 5a, 5b to the data transmission device 6a.
, 6b is sent via either line.

[0007] The line monitoring units 1a and 1b monitor the state of the line connected to the data transmission device, and issue an alarm when the transmission quality of the line deteriorates. Transmission quality items that can be monitored include transmitting and receiving signal levels, signal-to-noise ratios, gain hits, phase hits, etc., and at least one of these is used.

[0008] Now, the data transmission devices 6a and 6b are connected to the line 5.
When communicating via a, the line monitoring device 1a
If a phase hit is detected, the line monitoring section 1a sends an alarm to the alarm counting section 3 indicating this. The alarm counting section 3 counts how many alarms are sent from the same line within a certain period of time. Currently, if the number of alarms that occur on the line 5a is about one every 10 minutes, there is no problem because it will not affect data transmission, but if one or more alarms occur every minute, the efficiency of data transmission will decrease. There is a risk that it will decrease. Therefore, the alarm counting section 3 sends a notification to the line control section 4 when one or more alarms are received within one minute. When the line control unit 4 receives the notification, the line switching units 2a and 2b
5a to control the line between the data transmission devices 6a and 6b.
to 5b.

[0009]

As described above, the present invention can prevent deterioration in transmission quality by switching lines in accordance with the detection results of the line monitoring means.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention.

[Explanation of symbols]

1a, 1b Line monitoring section 2a, 2b Line switching section 3 Alarm counter 4 Line control section 5a, 5b line 6a, 6b Data transmission device

Claims (3)

[Claims] 1. A plurality of data transmission devices, a plurality of lines connecting the plurality of data transmission devices, a line switching means for switching and selecting the plurality of lines, and a plurality of lines selected by the line switching means. a line monitoring means for monitoring the transmission quality of the line being connected to detect a deterioration in the transmission quality; and a line control means for controlling switching in the line switching means based on the detection result of the line monitoring means. control method. 2. The automatic line control system according to claim 1, wherein the item of transmission quality to be monitored by the line monitoring means is at least one of a transmitting/receiving signal level, a signal-to-noise ratio, a gain hit, and a phase hit. . 3. A claim in which the line monitoring means generates an alarm each time a deterioration in transmission quality is detected, and switches the line when the alarm occurs a predetermined number or more within a predetermined time. The line automatic control method described in item 1 or 2.