JP2821234B2 - Centralized monitoring system for bidirectional CATV transmission network - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a two-way CATV (Cable Television) transmission network for monitoring the operation state of various transmission facilities.
The present invention relates to a centralized monitoring system for a transmission network.

[Related Art] Generally, in a bidirectional CATV transmission network, a centralized monitoring system is used as a means for monitoring the state of a transmission line.

FIG. 2 shows a configuration of a conventional centralized monitoring system. In FIG. 2, reference numerals 11a, 11b,.
Is a detection device for detecting the operation state of each of the amplification devices 11a, 11b,..., 13 is a centralized monitoring device installed on the manager side of the CATV transmission network, 14 is a display device for displaying the monitoring state, and 15 Is a directional coupler that performs signal branching with respect to the coaxial line 16 as a transmission trunk line with the centralized monitoring device 13.

That is, the signal amplification states of the amplifiers 11a, 11b,... On the coaxial line 16 are detected by the detection devices 12a, 12b,. The signal is transmitted to the centralized monitoring device 13 via the coupler 15 as an upstream signal x. Thereby, the display device 14
, The operating state of each of the amplifiers 11a, 11b,... Is displayed.

FIG. 3 shows the internal configuration of the amplification device 11a and the detection device 12a in the conventional centralized monitoring system. A detection circuit 21 detects the operation state of the amplification device 11a, and a CPU 22 converts the detection result into information. Circuit, a double modulation circuit for modulating and outputting the information signal, a bidirectional filter for restricting and outputting the modulated signal to a specific band, and a directionality for transmitting the filter output onto the coaxial line. It is a coupler.

That is, the detection circuit 21 changes the operation state of the amplification device 11a,
For example, it measures and detects signal strength, voltage value, or current value, switch open / close state, etc., and sends the state detection signal to the CPU circuit 2.
2, the CPU circuit 22 transmits an information signal according to the detection state from the modulation circuit 23 through the filter 24 to the upstream signal.
It is transmitted to the centralized monitoring device 13 as x ₁ and x ₂ . Then, the centralized monitoring device 13 is the amplification device 1 obtained from the detection device 12a.
The state signal of 1a is subjected to arithmetic processing based on a preset normal value, and it is determined whether or not the amplifier 11a is in a normal operation state. As a result, the display device 14 displays the state determination data of the amplifier 11a.

[Problems to be Solved by the Invention] However, in the conventional centralized monitoring system, the amplifiers 11a, 11b,... Detected by the detection devices 12a, 12b,.
Operating state, the state is determined through the centralized monitoring device 13 and displayed on the display device 14.Since the information device has only a unidirectional flow of status information, the display device 14 displays, for example, an abnormal state of the amplifier device 11a as a warning. In this case, the administrator of the data transmission network must go to the installation location of the amplification device 11a where the warning is displayed, and perform an operation for correcting the abnormal operation. There is a drawback that requires labor.

The present invention has been made in view of the above problems, and even when a warning display of an amplifier is displayed, it is possible to easily perform inspection and maintenance work without having to go to the installation location of the amplifier in an abnormal state. An object of the present invention is to provide a centralized monitoring system for a bidirectional CATV transmission network.

[Means for Solving the Problems] That is, a centralized monitoring system for a bidirectional CATV transmission network according to the present invention includes an amplifying device installed on a transmission line and a detecting device for detecting an operation state of the amplifying device. A centralized monitoring device that determines whether the operating state of the amplification device detected by the detecting device is abnormal; a display device that displays the content of the state determination in the centralized monitoring device; An external input device that inputs operation correction data to the amplification device according to the determined content of the state of the amplification device, and adjusts and controls the operation state of the amplification device according to the correction data input by the external input device. And an amplification operation adjustment control means.

[Operation] In other words, the administrator of the CATV transmission network can correct the operation of the amplifying device in the abnormal state only by inputting the correction data using the external input device.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of a centralized monitoring system of a bidirectional CATV transmission network. In FIG. 1, reference numeral 11a denotes an amplifying device for amplifying a transmission signal, and 12a denotes an operating state of the amplifying device 11a to a monitoring side. A detection device for performing state correction processing, 13 is a centralized monitoring device for monitoring the state of the transmission line, 14 is a display device for displaying the line state, 15, 25 are directional couplers for connecting the main lines of the upper and lower signals, and 16 is a directional coupler. Coaxial line as CATV trunk line,
21 is a detection circuit for detecting the operation state of the amplifier 11a, 22 is a CPU circuit for performing transmission / reception processing of upper and lower signals, 23 is a double modulation circuit for performing frequency conversion processing of upper and lower signals, and 24 is both for limiting the band of transmission signals. Directional filter.

Then, an adjustment circuit 31 for correcting the operation state of the amplification device 11a is connected between the CPU circuit 22 and the amplification device 11a in the detection device 12a. Further, the display device 14 is connected to an external input device 32 provided with, for example, a keyboard and an adjustment circuit for inputting correction data of the amplification operation in the amplification devices 11a,.

That is, in the centralized monitoring system of the bidirectional CATV transmission network having the above configuration, when the operation state of the amplifier 11a is measured and detected by the detection circuit 21 of the detector 12a as its signal strength, voltage value, or open / closed state of the switch. The detection data is converted into information through the CPU circuit 22 and transmitted to the centralized monitoring device 13 as the uplink signals x ₁ and x ₂ through the double modulation circuit 23 and the bidirectional filter 24. Then, the centralized monitoring device 13 performs an arithmetic process based on the normal amplification data set in advance, and the amplification device 1 sent from the detection device 12a.
This is to determine whether the status data of 1a is abnormal.If the centralized monitoring device 13 determines that the amplifying device 11a is in an abnormal operation state, a warning display is displayed on the display device 14. Done.

Here, when the administrator of the CATV transmission network sees the warning display on the display device 14 and knows the abnormal state of the amplifying device 11a, the administrator uses the external input device 32 to perform amplification according to the abnormal state. by inputting the corrected data, CPU circuit 22 of the amplifier modification data detection device 12a as a downlink signal y ₁ ~y ₃
Sent to. Then, the CPU circuit 22 outputs a correction command signal based on the amplification correction data sent from the external input device 32 to the adjustment circuit 31, and the adjustment circuit 31 sends a signal to the amplifying device 11a such as switching of a switch or signal strength. , Voltage, etc. are adjusted. Thereby, the operation state of the amplifier 11a is corrected to the normal state.

Therefore, according to the centralized monitoring system of the bidirectional CATV transmission network having the above-described configuration, the abnormal state of the amplifier can be quickly and easily corrected without incurring time and labor such as moving to the amplifier and labor. This makes it possible for the administrator to perform the maintenance and inspection work of the CATV transmission network in a lump.

[Effects of the Invention] As described above, according to the present invention, a plurality of amplifying devices installed on a transmission line, a detecting device for detecting an operation state of the amplifying device, and the amplifying device detected by the detecting device A centralized monitoring device that determines whether or not the operation state of the device is abnormal; a display device that displays the content of the status determination in the centralized monitoring device; and a display device that displays the content of the status determination of the amplifying device displayed on the display device. An external input device for inputting operation correction data to the amplification device, and amplification operation adjustment control means for adjusting and controlling the operation state of the amplification device according to the correction data input by the external input device. The administrator can correct the operation of the amplifying device in an abnormal state only by inputting the correction data using the external input device. Therefore, even when the warning display of the amplifying device is performed, Inspection and maintenance work can be easily performed without having to go to the installation place of the amplifier in an abnormal state.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a centralized monitoring system of a bidirectional CATV transmission network according to an embodiment of the present invention, FIG. 2 is a block diagram showing a configuration of a conventional centralized monitoring system, and FIG. FIG. 2 is a block diagram showing an internal configuration of an amplifying device and a detecting device in the centralized monitoring system of FIG. 11a amplifying device, 12a detecting device, 13 centralized monitoring device, 14 display device, 15, 25 directional coupler, 16
Coaxial line, 21 detection circuit, 22 CPU circuit, 23 double modulation circuit, 24 bidirectional filter, 31 adjustment circuit, 32
... External input device.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04B 3/46 H04B 17/00

Claims (1)

(57) [Claims] A plurality of amplifying devices installed on a transmission line; a detecting device for detecting an operating state of the amplifying device; and whether or not the operating state of the amplifying device detected by the detecting device is abnormal. A centralized monitoring device for judging whether or not, a display device for displaying the content of the status determination in the centralized monitoring device, and operation correction data for the amplifying device input according to the content of the status determination for the amplifying device displayed on the display device An external input device, and an amplification operation adjustment control means for adjusting and controlling the operation state of the amplification device according to the correction data input by the external input device. Centralized monitoring system.