JPH11252526A - Network managing device and its method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To speedily improve transmission quality by displaying information showing deterioration of the transmission quality when a bit error rate detected by an error rate detecting means is deviated from an allowable range so as to detect the deterioration of the transmission quality caused by mixed noise. SOLUTION: At the time of receiving a test signal, a digital status monitor 24 compares a transmitted test signal and the received test signal to detect the bit error rate of the received test signal. In addition, the monitor 24 detects a O/N ratio being the ratio of the carrier signal component of the test signal to a noise signal component. A detecting result is transmitted to a general managing device 27 to judge whether the bit error rate and the O/N ratio are respectively within an allowable range. Then, in a case that at least one of the bit error rate and the O/N ratio is deviated from the allowable range, the device 27 judges the deterioration of the transmission quality and displays information showing the deterioration of the quality of a CRT 28.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a CATV network and an L
The present invention relates to a network management device and a network management method for integrally managing heterogeneous networks to which an AN is connected.

[0002]

2. Description of the Related Art FIG. 11 is a block diagram showing a conventional network management apparatus. In FIG. 11, reference numeral 1 denotes a tree-like network (hereinafter, referred to as a network) composed of a plurality of bidirectional amplifiers 3.
2 is a coaxial cable, 3 is a relay amplifier (hereinafter, referred to as a “bidirectional amplifier”) that amplifies a transmission signal, and 3a is an amplifier that amplifies a broadcast wave transmitted from the broadcast wave transmitting device 5 to the television 8. Down amplifier of bidirectional amplifier 3
b denotes an upstream amplifier of the bidirectional amplifier 3 for amplifying monitoring data transmitted from the monitor terminal 4 to the status monitor 9;
A monitor terminal for measuring the high-frequency signal transmission level of the bidirectional amplifier 3, the internal drive voltage, and the temperature in the case, and transmitting these measurement results (monitoring data) to the status monitor 9,
5 is a broadcast wave transmitting device for transmitting broadcast waves, 6 is a head end for mixing and distributing frequency bands (channels) used by the broadcast wave transmitting device 5, 7 is a home terminal for connecting a television 8 to the CATV network 1, Reference numeral 8 denotes a television that receives the broadcast wave transmitted from the broadcast wave transmitting device 5, and 9 denotes a status monitor that monitors the quality of the bidirectional amplifier 3 based on the monitoring data transmitted from the monitor terminal 4.

Next, the operation will be described. CATV network 1
Is a tree-like network composed of a plurality of bidirectional amplifiers 3, which plays a role of distributing broadcast waves transmitted from the broadcast wave transmitting device 5 to many televisions 8, and is connected to the CATV network 1. Since it is necessary to manage the quality of the bidirectional amplifier 3, the broadcast wave transmitting device 5 transmits the broadcast wave to the television 8, and also the monitor terminal 4 transmits the monitor data to the status monitor 9. A line is provided.

However, since the data amount of the monitoring data transmitted by the monitor terminal 4 is extremely small compared to the data amount of the broadcast wave transmitted by the broadcast wave transmitting device 5, the amplification factor of the bidirectional amplifier 3 and the amplification factor of the upstream amplifier 3b are The dynamic range used is smaller than the amplification factor of the downstream amplifier 3a in the bidirectional amplifier 3, and the upstream line of the CATV network 1 is used as a low-speed transmission line. Also,
The frequency band assigned to the uplink is also smaller than the frequency band assigned to the downlink.

Here, the quality control method of the bidirectional amplifier 3 will be specifically described. First, each monitor terminal 4 connected to the bidirectional amplifier 3 (the monitor terminal 4 is not attached in the example of FIG. 11). Although there is a bidirectional amplifier 3, which is usually attached to each bidirectional amplifier 3), it always measures a high-frequency signal transmission level, an internal drive voltage, a case temperature, and the like of the connected bidirectional amplifier 3. .

[0006] The monitor terminal 4 is connected to the bidirectional amplifier 3.
Of the high-frequency signal transmission level of the CATV network 1
These measurement results (monitoring data) are transmitted to the status monitor 9 by using the uplink line (the monitoring data transmission timing is determined when a monitoring data transmission request is received from the status monitor 9 or at a predetermined transmission cycle time). At the time). When the monitoring data is transmitted from each monitor terminal 4 in this way, the status monitor 9 monitors the change in the monitoring data and detects the bidirectional amplifier 3 whose quality has deteriorated.

An apparatus for detecting a deterioration in image quality by displaying a still image on a monitor is disclosed in Japanese Patent Laid-Open No. 4-304.
797.

[0008]

Since the conventional network management apparatus is configured as described above, the quality of the bidirectional amplifier 3 constituting the CATV network 1 can be managed, but, for example, electric noise is integrated. Even if the transmission quality is deteriorated due to the influence of the ingress noise or the influence of the group delay characteristic due to the continuation of the bidirectional amplifier 3, there is no means for detecting the deterioration of the transmission quality. Therefore, there is a problem that the transmission quality cannot be improved promptly. When the transmission quality is deteriorated, the influence on the uplink having a small amplification factor and a small dynamic range is great, and there is also a problem that data transmission using the uplink becomes impossible.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and provides a network management apparatus and a network management method capable of detecting deterioration of transmission quality due to mixing of ingress noise and the like. The purpose is to: In addition, the present invention, when the transmission quality is deteriorated,
An object of the present invention is to provide a network management device and a network management method capable of quickly improving transmission quality.

[0010]

A network management device according to the present invention is adapted to display information indicating deterioration of transmission quality when a bit error rate detected by an error rate detection means deviates from an allowable range. It is.

[0011] The network management device according to the present invention comprises:
The bit error rate detected by the error rate detecting means is displayed.

[0012] The network management device according to the present invention comprises:
If the CN ratio or the noise signal component detected by the noise detection means deviates from the allowable range, information indicating deterioration of transmission quality is displayed.

[0013] The network management device according to the present invention comprises:
The CN ratio or noise signal component detected by the noise detection means is displayed.

[0014] The network management device according to the present invention comprises:
If the transmission speed detected by the speed detection means deviates from an allowable range, information indicating deterioration of transmission quality is displayed.

[0015] The network management device according to the present invention comprises:
The transmission speed detected by the speed detecting means is displayed.

A network management device according to the present invention comprises:
When the bit error rate and the CN ratio or the noise signal component deviate from the allowable range, information indicating the deterioration of the transmission quality is displayed.

The network management device according to the present invention comprises:
In addition to displaying the quality of the bidirectional amplifier detected by the quality detecting means, when the monitoring result of the monitoring means indicates a deviation from an allowable range, information indicating the quality deterioration of the bidirectional amplifier is displayed. It is.

The network management device according to the present invention comprises:
In addition to displaying the transmission speed of the data output to the LAN, when the monitoring result of the monitoring means indicates a deviation from the allowable range, information indicating the deterioration of the transmission quality is displayed.

The network management device according to the present invention comprises:
In addition to displaying the quality of the device connected to the LAN, when the monitoring result of the monitoring means indicates a deviation from the allowable range, information indicating the quality deterioration of the device is displayed.

The network management device according to the present invention comprises:
If the monitoring result of the monitoring means indicates a deviation from the allowable range,
This is to report the occurrence of an abnormality.

[0021] The network management device according to the present invention comprises:
The detection status of each detection means is notified.

The network management device according to the present invention comprises:
The display contents of the display means are superimposed on the map on which the CATV network is displayed.

The network management device according to the present invention comprises:
Devices connected to a LAN that is connected to the CATV network are displayed on a map.

The network management device according to the present invention comprises:
When a plurality of devices are connected to the LAN, only the representative device connected to the LAN is displayed on the map.

The network management device according to the present invention comprises:
The device closest to the demarcation point between the CATV network and the LAN is set as the representative device.

The network management device according to the present invention comprises:
The demarcation point between the CATV network and the LAN is used as a protector for a coaxial cable or an optical termination box for an optical fiber cable.

The network management device according to the present invention comprises:
When a representative device displayed on the map is selected, information on each device connected to the LAN is scroll-displayed.

The network management device according to the present invention comprises:
When the representative device displayed on the map is selected, a configuration diagram of the LAN is displayed.

The network management device according to the present invention comprises:
When an access is received via the Internet, the display contents of the display means and the information of the map on which the CATV network is displayed are transmitted to the access source.

The network management device according to the present invention comprises:
If the monitoring result of the monitoring means indicates a deviation from the allowable range,
This is to adjust the signal transmission level of the modem connected to the CATV network.

The network management device according to the present invention comprises:
It monitors the traffic usage rate of the uplink or the downlink in the CATV network, displays information indicating the traffic usage rate on a map, and determines a communication protocol of a newly connected channel according to the traffic usage rate. It was made.

The network management method according to the present invention comprises:
A test signal returned from a monitor terminal is received, a bit error rate of the test signal is detected, and when the bit error rate deviates from an allowable range, information indicating deterioration of transmission quality is displayed. is there.

The network management method according to the present invention comprises:
The test signal returned from the monitor terminal is received, and a CN ratio of the test signal or a noise signal component included in the test signal is detected. If the CN ratio or the noise signal component deviates from an allowable range, transmission quality is deteriorated. Is displayed.

The network management method according to the present invention comprises:
When a transmission speed is received from a modem and the transmission speed deviates from an allowable range, information indicating deterioration of transmission quality is displayed.

The network management method according to the present invention comprises:
When indicating a deviation from the allowable range, the signal transmission level of the modem connected to the CATV network is adjusted.

The network management method according to the present invention comprises:
It monitors the traffic usage rate of the uplink or the downlink in the CATV network, displays information indicating the traffic usage rate on a map, and determines a communication protocol of a newly connected channel according to the traffic usage rate. It was made.

[0037]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a configuration diagram showing a network management apparatus according to Embodiment 1 of the present invention.
Reference numeral 11 denotes a tree-like network (hereinafter, referred to as a “CATV network”) composed of a plurality of bidirectional amplifiers 13.
Is a coaxial cable, 13 is a relay amplifier (hereinafter, referred to as a "bidirectional amplifier") that amplifies a transmission signal, and 13a is a downstream of the bidirectional amplifier 13 that amplifies a broadcast wave transmitted from the broadcast wave transmitting device 15 to the television 18. An amplifier 13b is an upstream amplifier of the bidirectional amplifier 13 for amplifying monitoring data and the like transmitted from the monitor terminal 14 to the analog status monitor 23, 14 is a high-frequency signal transmission level of the bidirectional amplifier 13,
The internal drive voltage and the temperature in the case are measured, and the measurement result (monitoring data) is transmitted to the analog status monitor 23. When a test signal is received from the digital status monitor 24, the test signal is transmitted to the digital status monitor 24. This is the monitor terminal that returns.

Reference numeral 15 denotes a broadcast wave transmitting device for transmitting a broadcast wave, 16 denotes a head end for mixing and distributing frequency bands (channels) used by the broadcast wave transmitting device 15 and the like.
Is a home terminal for connecting a television 18 to the CATV network 11, 18 is a television for receiving broadcast waves transmitted from the broadcast wave transmitting device 15, 19 is a modem for modulating and demodulating data transmitted and received by the terminal 20, and the transmission speed of the data is reduced. A cable modem (modem) to be transmitted to the modem management device 25, 2
0 is a terminal (equipment) connected to the LAN 21, and 21 is LA
N (Local Area Network) and 22 are coaxial cable protectors (provided that the CATV network 11 and the LAN 2 are installed) at the demarcation point between the CATV network 11 and the LAN 21.
In the case where the connection 1 is performed using an optical fiber instead of the coaxial cable 12, an optical termination box is installed).

Further, reference numeral 23 denotes an analog status monitor (quality detecting means) for receiving monitoring data relating to the quality of the bidirectional amplifier 13 transmitted from the monitor terminal 14, and 24 transmits a test signal to the monitor terminal 14 and Upon receiving the test signal returned from the monitor terminal 14,
A digital status monitor (error rate detecting means, noise detecting means, communication status detecting means) for detecting a bit error rate and a CN ratio of the test signal, and a transmission rate 25 of data transmitted from the cable modem 19 or the like on the terminal side. Modem management device for receiving (speed detecting means), 26
Is a LAN management device (speed detection means, quality detection means) for detecting the transmission speed of data output from the terminal 20 to the LAN 21 and monitoring the quality (for example, signal transmission level, etc.) of the terminal 20; It monitors whether or not the bit error rates and the like output from the monitor 24 are within the allowable ranges. If the bit error rates and the like deviate from the allowable ranges, a display command of information indicating deterioration of transmission quality and the like is issued. Is a CRT (display means) which displays information indicating the deterioration of transmission quality when receiving a display command from the comprehensive management apparatus 27.

FIG. 2 is a flowchart showing a network management method according to the first embodiment of the present invention.

Next, the operation will be described. CATV network 1
Reference numeral 1 denotes a tree-like network composed of a plurality of bidirectional amplifiers 13, which plays a role of distributing broadcast waves transmitted from the broadcast wave transmitting device 15 to a large number of televisions 18. In this embodiment, 1, different LANs 21
The CATV network 11 is used as a transmission line for connecting different LANs 21 so that the terminals 20 connected to each other can mutually transmit data.

First, the operation when data is transmitted from the terminal 20 on the center side to the terminal 20 on the local side will be described. First, the terminal 20 on the center side transmits data to the cable modem 19 on the center side via the LAN 21. Send,
The cable modem 19 on the center side modulates the data and
Output to the ATV network 11. As a result, the data output from the center-side cable modem 19 reaches the local-side cable modem 19 while being amplified by the downstream amplifier 13a of the bidirectional amplifier 13 constituting the CATV network 11. Then, the cable modem 19 on the local side
When data is received from the ATV network 11, the data is demodulated and output to the LAN 21.
The data is received from the AN 21.

Next, the operation when data is transmitted from the local terminal 20 to the center terminal 20 will be described. First, the local terminal 20 transmits data to the local cable modem 19 via the LAN 21. The cable modem 19 on the local side modulates the data and
Output to the TV network 11. As a result, the data output from the local cable modem 19 is transmitted to the CATV network 1.
1 and reaches the cable modem 19 on the center side while being amplified by the upstream amplifier 13b of the bidirectional amplifier 13 constituting 1. Then, the cable modem 19 on the center side
When data is received from the TV network 11, the data is demodulated and output to the LAN 21.
The data is received from N21.

Further, the operation when data is transmitted from the local terminal 20 to the local terminal will be described (for convenience of explanation, the local side is divided into A and B systems, and It is assumed that data is transmitted to the terminal 20 of the system A).
0 transmits data to the A-system cable modem 19 via the LAN 21, and the A-system cable modem 19 modulates the data and outputs it to the CATV network 11. Thus, A
The data output from the cable modem 19 of the system
The signal reaches the head end 16 while being amplified by the upstream amplifier 13b of the bidirectional amplifier 13 constituting the ATV network 11.

The head end 16 is connected to the CATV network 1
1 receives the data from the CATV network 1
Return to 1. As a result, the data returned from the head end 16 reaches the cable modem 19 of the B system while being amplified by the downstream amplifier 13a of the bidirectional amplifier 13 constituting the CATV network 11. When receiving the data from the CATV network 11, the cable modem 19 of the B system demodulates the data and outputs the data to the LAN 21, and the terminal 20 of the B system receives the data from the LAN 21.

The data transmission between the terminals 20 connected to different LANs 21 is as described above. However, when data is transmitted from the local terminal 20 to the center terminal 20 or when data is transmitted from the local terminal 20 to the local side. Terminal 2
0, the data is transmitted to the CATV network 1
1 is transmitted while being amplified by the upstream amplifier 13b of the bidirectional amplifier 13 that constitutes 1. However, since the amplification factor of the upstream amplifier 13b in the bidirectional amplifier 13 is smaller than the amplification factor of the downstream amplifier 13a in the bidirectional amplifier 13, for example, inflow noise or the like in which electric noise is integrated. Is mixed into the CATV network 11, C
The uplink of the ATV network 11 is easily affected, and the transmission quality of the uplink degrades.

Therefore, in the first embodiment, the digital status monitor 24 is first sent from the cable modem 19 on the center side to the monitor terminal 14 in order to be able to identify the location where the transmission quality is degraded. A test signal is transmitted (step ST1). However, CAT
The test signal is transmitted to all the monitor terminals 14 connected to the V network 11, and is usually attached to each bidirectional amplifier 13 (the bidirectional amplifier 13 may include the monitor terminal 14 in some cases). ). When the monitor terminal 14 receives the test signal, it returns the test signal as it is, so that the digital status monitor 24 receives the test signal from the cable modem 19 on the center side (step ST2).

The digital status monitor 24
When the test signal is received, the transmitted test signal is compared with the received test signal to detect the bit error rate of the received test signal (step ST3). Also,
The digital status monitor 24 detects a CN ratio (dynamic range) which is a ratio between a carrier signal component and a noise signal component of the test signal (step ST3).

As described above, when the digital status monitor 24 detects the bit error rate and the CN ratio of the test signal, the detection result is transmitted to the general management device 27, and the general management device 27 checks the bit error rate and the CN ratio. Are determined to be within the respective allowable ranges (steps ST4 and ST5). If at least one of the bit error rate and the CN ratio deviates from the allowable range, the general management device 27 determines that the transmission quality has deteriorated, and outputs information indicating the deterioration of the transmission quality to the CRT 28. (Step ST6). In addition, the comprehensive management device 27
When displaying information indicating the deterioration of transmission quality on the CRT 28, the detection result (bit error rate, CN ratio) of the digital status monitor 24 is displayed on the CRT 28, and the detection result is returned from any monitor terminal 14. The test signal is displayed so that it is clear whether the test signal is based on the test signal.

Next, similarly to the digital status monitor 24, the modem management device 25 transmits and receives the current transmission / reception by the local cable modem 19 in order to be able to specify the place where the transmission quality is deteriorated. The transmission speed of the data is received from the cable modem 19 on the center side. That is, when the local cable modem 19 outputs a transmission request for information indicating the transmission speed of data currently transmitted / received to the local cable modem 19 (step ST7), the local cable modem 19 indicates the transmission speed. Since the information is transmitted to the center-side cable modem 19, information indicating the transmission speed is received from the center-side cable modem 19 (step ST8). However,
If the local cable modem 19 is not currently transmitting or receiving data, the center cable modem 19
Transmits a test signal to the local-side cable modem 19, and receives information indicating the transmission speed when the local-side cable modem 19 transmits and receives the test signal from the local-side cable modem 19.

When the modem management device 25 receives the information indicating the transmission speed from the cable modem 19 on the center side, the modem management device 25 transmits the information indicating the transmission speed to the general management device 27. Is within the allowable range (step ST9). And
The integrated management device 27 is a local-side cable modem 19.
If the transmission speed is out of the allowable range, it is determined that the transmission quality has deteriorated, and information indicating the deterioration of the transmission quality is displayed on the CRT 28 (step ST10). In addition,
The general management device 27 stores the information indicating the deterioration of the transmission quality in the CR
When displaying on the T28, the cable modem 19 on the local side is used.
Displays the transmission speed of the data to be transmitted and received on the CRT 28, and also displays the information indicating the transmission speed so that it is clear from which cable modem 19 the data was transmitted.

Next, the analog status monitor 23
In order to be able to identify the bidirectional amplifier 13 whose quality has deteriorated, monitoring data (high-frequency signal transmission level of the bidirectional amplifier 13, internal drive voltage, case temperature, etc.) measured by each monitor terminal 14 can be specified. ) Is received from the cable modem 19 (step ST11). However,
The reception timing of the monitoring data is when the analog status monitor 23 transmits a transmission request for the monitoring data or when a predetermined reception cycle time is reached.

When the analog status monitor 23 receives the monitoring data from the cable modem 19 on the center side, the analog status monitor 23 transmits the monitoring data to the general management device 27,
The general management device 27 determines whether or not the quality of the bidirectional amplifier 13 is within an allowable range based on the monitoring data (step ST12). And the comprehensive management device 27
If the quality of the bidirectional amplifier 13 is out of the allowable range, it is determined that the quality of the bidirectional amplifier 13 has deteriorated, and information indicating the quality deterioration is displayed on the CRT 28 (step ST13). When displaying the information indicating the quality deterioration on the CRT 28, the comprehensive management device 27 displays the monitoring data of each bidirectional amplifier 13 and clarifies which bidirectional amplifier 13 is degraded in quality. Display as follows.

Next, the LAN management device 26
In order to be able to identify the transmission quality deterioration and the terminal 20 whose quality has deteriorated,
The transmission rate of the data output to N21 is detected (step ST14), and information indicating the quality of the terminal 20 (for example, signal transmission level) is collected from the terminal 20 (step ST15).

When the LAN management device 26 detects the transmission speed and collects information indicating the quality of the terminal 20, the LAN management device 26 transmits the transmission speed and the information indicating the quality of the terminal 20 to the comprehensive management device 2.
7 and the general management device 27 determines whether the transmission speed and the quality of the terminal 20 are within the allowable ranges, respectively (steps ST16 and ST18). When the transmission speed is out of the allowable range, the comprehensive management device 27 determines that the transmission quality is degraded, and displays information indicating the degradation of the transmission quality on the CRT 28 (step ST1).
7). On the other hand, when the quality of the terminal 20 is out of the allowable range, it is determined that the quality of the terminal 20 is deteriorated, and information indicating the quality deterioration is displayed on the CRT 28 (step S).
T19).

When displaying the information indicating the deterioration of the transmission quality on the CRT 28, the comprehensive management device 27 displays the transmission speed of the data output from the terminal 20 to the LAN 21 and the transmission quality of which LAN 21 is deteriorated. Display so that it is clear whether or not. In addition, the comprehensive management device 27
When the information indicating the quality deterioration is displayed on the CRT 28, the information indicating the quality of the terminal 20 is displayed and the terminal 20 whose quality is deteriorated is clearly displayed.

As is clear from the above, the first embodiment
According to the above, it is monitored whether or not the bit error rates and the like output from the digital status monitor 24 are within the allowable ranges, and if the bit error rates and the like deviate from the allowable ranges, the transmission quality is deteriorated. Is displayed, so that it is possible to detect a deterioration in transmission quality due to mixing of ingress noise and the like.

Embodiment 2 In the first embodiment, the digital status monitor 24 detects the CN ratio of the test signal. However, the digital status monitor 24 detects a noise signal component included in the test signal, and the comprehensive management device 27 CR of noise signal component
In addition to displaying the information at T28, if the noise signal component deviates from the allowable range, information indicating the deterioration of the transmission quality may be displayed on the CRT 28.

Embodiment 3 FIG. 3 is a configuration diagram showing details of a comprehensive management device in a network management device according to a third embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 2
Numeral 9 monitors whether the bit error rate output from the digital status monitor 24 is within an allowable range, and if the bit error rate deviates from the allowable range, indicates deterioration of transmission quality. A monitoring unit (monitoring unit) 30 that outputs an information display command, when the monitoring result of the monitoring unit 29 indicates a deviation from an allowable range, notifies the occurrence of an abnormality and indicates the transmission quality, the quality of the terminal, and the like. A reporting unit (reporting unit) that reports information (for example, a bit error rate and a transmission rate).

Next, the operation will be described. In Embodiments 1 and 2 described above, when the bit error rate or the like deviates from the allowable range, information indicating deterioration of transmission quality or the like is displayed on the CRT 28. In the case where the bit error rate or the like indicates a deviation from the allowable range, the reporting unit 30 calls, for example, a mobile phone owned by the administrator of the network management device to report the occurrence of the abnormality and transmit the message. Information indicating the quality, the quality of the terminal, and the like (for example, a bit error rate and a transmission speed) are notified. As a result, even when the manager of the network management device is located at a position distant from the place where the network management device is located, an effect of being able to recognize the occurrence of an abnormality and the state of the network is achieved.

Embodiment 4 FIG. 4 is a configuration diagram showing details of a comprehensive management device in a network management device according to a fourth embodiment of the present invention. In the figure, the same reference numerals as in FIG. 3
Reference numeral 1 denotes a database for storing a map on which the CATV network 11 appears, and reference numeral 32 denotes a display control unit (display control means) for superimposing and displaying information indicating deterioration of transmission quality on the map on which the CATV network 11 appears.

Next, the operation will be described. In the first embodiment and the like, information indicating the deterioration of transmission quality and the like is stored in CRT 28
In displaying the information, no particular reference is made to a method of displaying such information. For example, as shown in FIG.
Information indicating deterioration of transmission quality or the like may be displayed on the map on which the network 11 appears. As a result, there is an effect that it is possible to see at a glance the location where the transmission quality or the like has deteriorated, the bidirectional amplifier 13 or the like where the quality has deteriorated.

In FIG. 5, the cable modem 19 is
, The bidirectional amplifier 13 is represented by a circle, and the terminal 20 connected to the LAN 21 is represented by a circle. For example, when the quality of the bidirectional amplifier 13 deteriorates, the blue circle changes to a red circle. I do. When the quality of the terminal 20 is deteriorated, the mark changes from a blue mark to a red mark. Further, when the transmission speed deviates from the allowable range, the color of the numerical value indicating the transmission speed changes from blue to red.

Embodiment 5 In the fourth embodiment, L
When a plurality of terminals 20 are connected to the AN 21, all terminals 20 are displayed on the map (see D in FIG. 5). However, since the display area of the CRT 28 is constant, the terminal 21 is connected to the LAN 21. When the number of terminals 20 to be displayed increases, the symbols of the terminals 20 and the like need to be expressed in a smaller size, and the display contents may be difficult to see.
Therefore, in the fifth embodiment, the terminal 20 closest to the coaxial cable protector 22 (or the optical termination box) is set as the representative device, and only the representative device is displayed on the map (see FIG. 6). reference). As a result, even if the number of terminals 20 connected to the LAN 21 increases, an effect that the display content of the CRT 28 becomes difficult to see can be avoided.

Embodiment 6 FIG. In Embodiment 5 described above, only the representative device is displayed on the map.
Information about each terminal 20 connected to the LAN 21 may be scroll-displayed as shown in FIG. 7 (when not all the terminals 20 are displayed on one screen, clicking on the symbol 、 The page is turned to display information relating to the other terminal 20). Thereby, even if only the representative device is displayed on the map, an effect that information relating to each terminal 20 can be easily recognized is achieved.

Embodiment 7 In Embodiment 5 described above, only the representative device is displayed on the map.
When the representative device displayed on the map is selected (for example,
The representative device is selected by double-clicking the representative device using a mouse), as shown in FIG.
1 may be displayed. This allows
Even if only the representative device is displayed on the map, the LAN 21
The effect that the structure of can be recognized is produced.

Embodiment 8 FIG. In the first to seventh embodiments, the integrated management device 27 displays information indicating the deterioration of transmission quality on the CRT 28. However, when the integrated management device 27 is accessed via the Internet, the transmission is performed. Information indicating deterioration of quality and the like and information of a map on which the CATV network appears may be transmitted to the access source. Thus, there is an effect that the state of the network can be recognized without going to the place where the network management device exists.

Embodiment 9 FIG. 9 is a configuration diagram showing details of the integrated management device in the network management device according to the ninth embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 3
Reference numeral 3 denotes a cable modem 19 connected to the CATV network 11 when the monitoring result of the monitoring unit 29 indicates a deviation from an allowable range.
Level adjustment unit (adjustment means) for adjusting the signal transmission level of
It is.

Next, the operation will be described. In the above-described first to seventh embodiments, the case where the comprehensive management device 27 displays information indicating the deterioration of transmission quality on the CRT 28 has been described, but the monitoring result of the monitoring unit 29 indicates a deviation from the allowable range. Alternatively, the signal transmission level of the cable modem 19 connected to the CATV network 11 may be adjusted. That is, when the bit error rate, the transmission speed, and the like deviate from the permissible ranges, the level adjustment unit 33 adjusts the signal transmission level of the cable modem 19 to be higher.

Thus, even if the bit error rate or the like deviates from the allowable range and the transmission quality is degraded, the transmission quality can be promptly improved. However, if the signal transmission level becomes too high and the data transmission speed exceeds the upper limit, the receiving terminal 20 may not be able to receive data, so that the data transmission speed does not exceed the upper limit. The signal transmission level of the cable modem 19 is adjusted within the range.

Embodiment 10 FIG. FIG. 10 is a configuration diagram showing a network management apparatus according to Embodiment 10 of the present invention. In the figure, the same reference numerals as those in FIG. 1 denote the same or corresponding parts, and a description thereof will not be repeated. Numeral 34 monitors the traffic usage rate of the uplink or downlink in the CATV network 11, displays the information indicating the traffic usage rate on a map, and sets the communication protocol of a newly connected channel according to the traffic usage rate. It is a protocol determining unit (protocol determining means) to determine.

Next, the operation will be described. In the first to seventh embodiments, the case where the comprehensive management device 27 displays information indicating the deterioration of transmission quality on the CRT 28 has been described.
1 to monitor the traffic use rate of the uplink or downlink, display the information indicating the traffic use rate on a map, and determine the communication protocol of the newly connected channel according to the traffic use rate. You may.

That is, the frequency band assigned to the uplink of the CATV network 11 is smaller than the frequency band assigned to the downlink as described above.
Even if the amount of data transmitted using the uplink is small, the traffic usage rate of the uplink increases and the CATV network 11
May be difficult to use.

Therefore, in the tenth embodiment, the protocol determining unit 34 monitors the traffic usage rate of the uplink in the CATV network 11 and determines whether the traffic usage rate of the uplink exceeds the set value. . If the uplink traffic usage rate is equal to or less than the set value, the communication protocol of the newly connected channel is set to TCP.
/ IP, but when the traffic usage rate of the uplink exceeds the set value, the communication protocol of the newly connected channel is UDP / IP.

Thus, the communication protocol is TCP / I
In the case of P, an ACK signal or the like is returned using the uplink, but if the communication protocol is UDP / IP, the ACK signal or the like is not returned using the uplink and the uplink traffic is reduced accordingly. Utilization decreases. Therefore, the stability of bidirectional communication using the CATV network 11 is improved.

[0076]

As described above, according to the present invention, when the bit error rate detected by the error rate detecting means deviates from the allowable range, information indicating deterioration of transmission quality is displayed. There is an effect that it is possible to detect the deterioration of the transmission quality due to the mixing of the ingress noise and the like.

According to the present invention, since the bit error rate detected by the error rate detecting means is displayed, the transmission quality of the CATV network can be evaluated.

According to the present invention, when the CN ratio or the noise signal component detected by the noise detection means deviates from the allowable range, the information indicating the deterioration of the transmission quality is displayed. Thus, there is an effect that deterioration of transmission quality due to the above-mentioned factors can be detected.

According to the present invention, the configuration is such that the CN ratio or the noise signal component detected by the noise detecting means is displayed, so that the transmission quality of the CATV network can be evaluated.

According to the present invention, when the transmission speed detected by the speed detecting means deviates from the allowable range, information indicating the deterioration of the transmission quality is displayed. It is possible to detect the deterioration of the transmission quality.

According to the present invention, since the transmission rate detected by the rate detecting means is displayed, the CA
There is an effect that the transmission quality of the TV network can be evaluated.

According to the present invention, when the bit error rate and the CN ratio or the noise signal component deviate from the allowable range,
Since the information indicating the deterioration of the transmission quality is configured to be displayed, it is possible to detect the deterioration of the transmission quality due to the mixing of the ingress noise and the like.

According to the present invention, the quality of the bidirectional amplifier detected by the quality detecting means is displayed, and if the monitoring result of the monitoring means indicates a deviation from the allowable range, the deterioration of the quality of the bidirectional amplifier is determined. Since the information to be displayed is configured to be displayed, it is possible to detect the quality deterioration of the bidirectional amplifier and to evaluate the quality of the bidirectional amplifier.

According to the present invention, the transmission rate of the data output to the LAN is displayed, and when the monitoring result of the monitoring means indicates a deviation from the allowable range, information indicating the deterioration of the transmission quality is displayed. With this configuration, it is possible to detect deterioration of the transmission quality of the LAN and to evaluate the transmission quality of the LAN.

According to the present invention, the quality of a device connected to the LAN is displayed, and when the monitoring result of the monitoring means indicates a deviation from an allowable range, information indicating the quality deterioration of the device is displayed. , It is possible to detect the quality degradation of the equipment connected to the LAN,
There is an effect that the quality of the device can be evaluated.

According to the present invention, when the monitoring result of the monitoring means indicates a deviation from the allowable range, the occurrence of an abnormality is reported. For example, the administrator of the network management device There is an effect that the occurrence of an abnormality can be recognized even when the user is away from the place where is present.

According to the present invention, the configuration is such that the detection status of each detection means is notified, so that even when the network management device is located away from the location where the network management device is located, the network status can be recognized. There is.

According to the present invention, the display contents of the display means are displayed so as to be superimposed on the map on which the CATV network is displayed, so that the transmission quality is degraded or the transmission quality is degraded in both directions. There is an effect that the amplifier and the like can be grasped at a glance.

According to the present invention, the devices connected to the LAN having a connection relationship with the CATV network are configured to be displayed on the map, so that the deterioration of the transmission quality of the LAN and the quality of the devices connected to the LAN can be reduced. There is an effect that can be grasped at a glance.

According to the present invention, when a plurality of devices are connected to the LAN, only the representative device connected to the LAN is displayed on the map, so that the number of devices connected to the LAN is reduced. Even if it increases, there is an effect that it is possible to avoid a problem that the display content of the CRT becomes difficult to see.

According to the present invention, since the device closest to the demarcation point between the CATV network and the LAN is configured as the representative device, the management of the devices connected to the LAN is facilitated.

According to the present invention, the demarcation point between the CATV network and the LAN is configured to be a protector for a coaxial cable or an optical termination box for an optical fiber cable. is there.

According to the present invention, when the representative device displayed on the map is selected, information relating to each device connected to the LAN is scroll-displayed, so that only the representative device is displayed on the map. Even if it is displayed, there is an effect that information on each device can be easily recognized.

According to the present invention, when the representative device displayed on the map is selected, a configuration diagram of the LAN is displayed. Therefore, even if only the representative device is displayed on the map, the LAN configuration is displayed. There is an effect that the configuration can be recognized.

According to the present invention, when an access is made via the Internet, the display contents of the display means and the information of the map on which the CATV network is displayed are transmitted to the access source, so that a network management device exists. There is an effect that the situation of the network can be recognized without going to a place.

According to the present invention, when the monitoring result of the monitoring means indicates a deviation from the allowable range, the signal transmission level of the modem connected to the CATV network is adjusted. If the transmission quality degrades outside the allowable range, the transmission quality can be improved immediately.

According to the present invention, the traffic usage rate of the uplink or the downlink in the CATV network is monitored, the information indicating the traffic usage rate is displayed on a map, and a new connection is made according to the traffic usage rate. Since the communication protocol of the channel to be used is determined, the traffic usage rate of the uplink can be reduced, and as a result, the effect of improving the stability of the bidirectional communication using the CATV network can be improved. is there.

According to the present invention, a test signal returned from a monitor terminal is received, a bit error rate of the test signal is detected, and if the bit error rate deviates from an allowable range, transmission quality is deteriorated. Since the information is configured to be displayed, there is an effect that it is possible to detect the deterioration of the transmission quality due to the mixing of the ingress noise and the like.

According to the present invention, the test signal returned from the monitor terminal is received, the CN ratio of the test signal or the noise signal component included in the test signal is detected, and the CN ratio or the noise signal component is allowed. If the information deviates from the range, the information indicating the deterioration of the transmission quality is displayed, so that there is an effect that the deterioration of the transmission quality due to the mixing of the ingress noise or the like can be detected.

According to the present invention, the transmission rate is received from the modem, and when the transmission rate deviates from the allowable range, the information indicating the deterioration of the transmission quality is displayed. There is an effect that it is possible to detect the deterioration of the transmission quality that is the cause.

According to the present invention, when a deviation from the allowable range is indicated, the signal transmission level of the modem connected to the CATV network is adjusted, so that the bit error rate and the like deviate from the allowable range. When the transmission quality is deteriorated, there is an effect that the transmission quality can be immediately improved.

According to the present invention, the traffic usage rate of the uplink or the downlink in the CATV network is monitored, information indicating the traffic usage rate is displayed on a map, and a new connection is made according to the traffic usage rate. Since the communication protocol of the channel to be used is determined, the traffic usage rate of the uplink can be reduced, and as a result, the effect of improving the stability of the bidirectional communication using the CATV network can be improved. is there.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a network management device according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing a network management method according to the first embodiment of the present invention.

FIG. 3 is a configuration diagram illustrating details of an integrated management device in a network management device according to a third embodiment of the present invention;

FIG. 4 is a configuration diagram showing details of an integrated management device in a network management device according to a fourth embodiment of the present invention.

FIG. 5 is a screen diagram illustrating display contents of a CRT.

FIG. 6 is a screen diagram illustrating display contents of a CRT.

FIG. 7 is a screen diagram illustrating a scroll display of a CRT.

FIG. 8 is a screen diagram showing a configuration diagram of a LAN.

FIG. 9 is a configuration diagram illustrating details of a comprehensive management device in a network management device according to a ninth embodiment of the present invention;

FIG. 10 is a configuration diagram showing a network management device according to a tenth embodiment of the present invention.

FIG. 11 is a configuration diagram showing a conventional network management device.

[Explanation of symbols]

11 CATV network, 13 bidirectional amplifier, 14 monitor terminal, 19 cable modem (modem), 20 terminal (equipment), 21 LAN, 22 protector, 23 analog status monitor (quality detection means), 24 digital status monitor (error rate) Detection means, noise detection means, communication status detection means), 25 modem management device (speed detection means), 26 LAN management device (speed detection means,
Quality detection means), 27 comprehensive management device (monitoring means), 2
8 CRT (display means), 29 monitoring unit (monitoring means), 3
0 notification unit (notification unit), 32 display control unit (display control unit), 33 level adjustment unit (adjustment unit), 34 protocol determination unit (protocol determination unit).

Claims (27)

[Claims] An error rate detecting means for transmitting a test signal to a monitor terminal installed in a CATV network, receiving a test signal returned from the monitor terminal, and detecting a bit error rate of the test signal. Monitoring means for monitoring whether the bit error rate detected by the error rate detection means is within an allowable range,
A display unit for displaying information indicating deterioration of transmission quality when a monitoring result of the monitoring unit indicates a deviation from an allowable range. 2. The network management device according to claim 1, wherein the display means displays the bit error rate detected by the error rate detection means. 3. A test signal is transmitted to a monitor terminal installed in a CATV network, and a test signal returned from the monitor terminal is received, and a CN ratio of the test signal or a noise signal component included in the test signal is received. A monitoring means for monitoring whether the CN ratio or the noise signal component detected by the noise detection means is within an allowable range, and a monitoring result of the monitoring means indicating a deviation from the allowable range. A display means for displaying information indicating the deterioration of the transmission quality. 4. The network management device according to claim 3, wherein the display means displays a CN ratio or a noise signal component detected by the noise detection means. 5. A speed detecting means for receiving a transmission speed of data transmitted / received by a modem connected to a CATV network from the modem, and determining whether or not the transmission speed detected by the speed detecting means is within an allowable range. When the monitoring means for monitoring and the monitoring result of the monitoring means indicate a deviation from an allowable range,
A network management device comprising: display means for displaying information indicating deterioration of transmission quality. 6. The network management device according to claim 5, wherein the display means displays the transmission speed detected by the speed detection means. 7. A test signal is transmitted to a monitor terminal installed in a CATV network, a test signal returned from the monitor terminal is received, a bit error rate of the test signal is detected, and the test is performed. A communication status detecting means for detecting a CN ratio of a signal or a noise signal component included in a test signal; a speed detecting means for receiving a transmission rate of data transmitted / received by a modem connected to a CATV network from the modem; It monitors whether the bit error rate and the CN ratio or the noise signal component detected by the detecting means are within an allowable range, and determines whether the transmission rate detected by the speed detecting means is within an allowable range. A monitor for monitoring, and a display for displaying information indicating deterioration of transmission quality when a result of monitoring by the monitor indicates a deviation from an allowable range. A network management device comprising: 8. A quality detecting means for detecting the quality of the bidirectional amplifier constituting the CATV network, and a monitoring means for monitoring whether or not the quality of the bidirectional amplifier detected by the quality detecting means is within an allowable range. And displaying the quality of the bidirectional amplifier detected by the quality detecting means, and displaying information indicating the quality deterioration of the bidirectional amplifier when the monitoring result of the monitoring means indicates a deviation from an allowable range. The network management device according to any one of claims 1 to 7, further comprising a display unit. 9. A speed detecting means for detecting a transmission speed of data output to a LAN connected to the CATV network,
Monitoring means for monitoring whether or not the transmission speed detected by the speed detection means is within an allowable range; displaying the transmission speed detected by the speed detection means; To indicate a deviation from
The network management device according to any one of claims 1 to 8, further comprising display means for displaying information indicating deterioration of transmission quality. 10. A quality detecting means for detecting the quality of equipment connected to a LAN connected to the CATV network, and monitoring whether or not the quality of the equipment detected by the quality detecting means is within an allowable range. Monitoring means, and displaying the quality of the equipment detected by the quality detecting means, and when the monitoring result of the monitoring means indicates a deviation from an allowable range,
10. The network management apparatus according to claim 1, further comprising a display unit for displaying information indicating quality degradation of the device. 11. A method according to claim 1, further comprising a notifying means for notifying the occurrence of an abnormality when a monitoring result of the monitoring means indicates a deviation from an allowable range. The network management device according to the item. 12. The network management device according to claim 11, wherein the notifying unit notifies a detection status of each detecting unit. 13. The display device according to claim 1, further comprising display control means for superimposing display contents of the display means on a map on which the CATV network is displayed. Network management device. 14. The network management device according to claim 13, wherein the display control means displays, on a map, devices connected to a LAN having a connection relationship with the CATV network. 15. The display control means, wherein the plurality of devices are connected to a LAN.
15. The network management device according to claim 14, wherein when connected to the network, only the representative device connected to the LAN is displayed on the map. 16. The display control means includes a CATV network and a LAN.
16. The network management apparatus according to claim 15, wherein a device closest to the demarcation point is set as a representative device. 17. The network management apparatus according to claim 16, wherein the demarcation point between the CATV network and the LAN is a protector of a coaxial cable or an optical termination box of an optical fiber cable. 18. The network management system according to claim 15, wherein when the representative device displayed on the map is selected, the display control means scrolls and displays information on each device connected to the LAN. apparatus. 19. The network management apparatus according to claim 15, wherein the display control means displays a LAN configuration diagram when a representative device displayed on the map is selected. 20. The display control means, upon receiving access via the Internet, displays contents of the display means and CATV.
The network management apparatus according to any one of claims 13 to 19, wherein information of a map on which a network is displayed is transmitted to an access source. 21. An apparatus according to claim 1, further comprising adjusting means for adjusting a signal transmission level of a modem connected to the CATV network when a monitoring result of the monitoring means indicates a deviation from an allowable range. 21. The network management device according to any one of items 20. 22. Monitoring the traffic usage rate of the uplink or the downlink in the CATV network, displaying information indicating the traffic usage rate on a map, and communicating a newly connected channel according to the traffic usage rate. 22. The network management apparatus according to claim 1, further comprising a protocol determination unit that determines a protocol. 23. A test signal is transmitted to a monitor terminal installed in a CATV network, a test signal returned from the monitor terminal is received, and a bit error rate of the test signal is detected. A network management method for displaying information indicating the deterioration of transmission quality when the value deviates from an allowable range. 24. A test signal is transmitted to a monitor terminal installed on a CATV network, and a test signal returned from the monitor terminal is received.
Detecting the noise signal component contained in the ratio or test signal,
A network management method for displaying information indicating deterioration of transmission quality when the CN ratio or noise signal component deviates from an allowable range. 25. A network management method for receiving a transmission speed of data transmitted and received by a modem connected to a CATV network from the modem, and displaying information indicating deterioration of transmission quality when the transmission speed deviates from an allowable range. 26. When indicating deviation from the allowable range, CA
26. The network management method according to claim 23, wherein a signal transmission level of a modem connected to a TV network is adjusted. 27. Monitoring the traffic usage rate of an uplink or a downlink in a CATV network, displaying information indicating the traffic usage rate on a map, and communicating a newly connected channel according to the traffic usage rate. The network management method according to any one of claims 23 to 26, wherein a protocol is determined.