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Broadcasting Institute of Science and Technology Institute Internet Yuan Min Connected to the article: [Map] Changchun City Cable TV Network security monitoring system (on) 4.2 Monitor Device Monitor the equivalent of sentinel surveillance system, it installed in the cable network Amplifiers Next, an output from the amplifier RF signal leads the way as a monitor input. Monitor is an embedded smart-house system, it will Cable All television signals in fast round sweep, monitor intelligent ability to judge that it can identify TV station The normal broadcast analog programming signal, Digital TV Program signals, data broadcasting, encrypted Analog television signals. When they find an illegal program or signal invasion, they will pass through the network back, immediately send warning messages. Monitor their own fault, will not affect the transmission network in the normal program of transmission, and control center through the inspection, monitor the fault information will be reflected to the monitoring center. You can also return the communication network, receiving from the other remote command control center. The device Aluminum Casting shell, fully enclosed waterproof structure shielded, Dimensions: 210x270x115cm, Weight 2.8Kg, machine power 5W, F connector, and through joint General . The equipment installed in the trunk, branch lines and distribution networks, installation location, as the scope of monitoring and control, are generally placed on the amplifier, the single-frequency interference with the function of monitor placed on the pre-amplifier. Do not have the shutdown of monitor and access and transmission networks, with the shutdown of the monitor connected in series in the transmission line. Monitor broadcast channels on digital station logo, and real-time monitoring of air channels to realize the transmission line safety monitoring purposes. When they find line fault (eg broken), abnormal or illegal signal broadcast signal insertion / mixing, the remote monitor network immediately by return automatically to the local Network Security Monitoring center alarm information transmission, without affecting the normal signal transmission quality. Meanwhile, the remote controlled monitor network monitoring center also accepted by the relevant return the network to send commands through the built-in single-frequency interference to the single channel scrambling, without affecting other channels of broadcast programs. Network monitoring center can accept the orders start built-in shutdown devices, implementation of the transmission line off completely cut off the transmission signals. Remote monitoring for the system central controller built-in TV tuner, cycle to receive the specified channel TV signal decoder also uses the identifying information into the device with the front-end changes, like code generation algorithm, according to the current TV image generated Change the picture code, with changes in the transmission of VBI code than to determine whether the illegal TV signals broadcast Source , Then determine whether there is an empty channel television signals. If there is an error or an empty channel station broadcast standard, the system central controller, fault-tolerant processing module starts, for fault-tolerant, that the illegal signal or line failure, start the alarm return module, take the initiative to the alarm monitoring center, while built-in 8MB of Flash memory records alarm information. To the monitoring center when receiving interference or shutdown command, the system central controller to open single-frequency interference, or off device, the implementation of line control. When the control mode set to Auto, the system central control center to monitor alarms at the same time, start the single frequency, or turn off devices, implementation of the circuit control. After removal of the illegal signals, the interference or shut down automatically. Remote monitor set to follow the following principles: monitor settings Coaxial cable Trunk amplifier front end. monitor the number and physical location of the settings, first of all should be Changchun Cable television The picture shows the network topology information, and generally to 200-500 months for each end-user, set a set of remote control monitoring device as a basic principle, be considered special circumstances. 4.3 return monitoring information network Backhaul network to monitor all the monitor connected with the monitoring center, It is responsible for monitor alarm message to the monitoring center, the site also will return the actual situation. According to the actual situation and development in Changchun and Operation Comprehensive consideration of cost, the program primarily uses GSM transmission return to monitor alarm and control information. Through the built-in GSM module monitor send alarm information, the help of the nearby existing GSM mobile communications base stations, the alarm information sent to local mobile communications network center. At this point, we must solve the GSM communication service center and cable data exchange between the monitoring center channel. This system uses 128KbpsDDN line, cable TV monitoring center was established to provide network services to GSM operators, short message service center hardware connection between, to ensure the smooth flow of alarm information channel, specializing in GSM return information, speed up the alarm information transmission rate GSM ways to improve the reliability of return.

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