Today, the digital network HD system has gradually been widely used in intelligent security systems with its advantages of ultra-high definition, ultra-high cost performance, remote monitoring, etc. In the future, intelligent security projects, analog systems will be eliminated, digital network HD will Become a new monitoring standard. Alloy Steel Seamless Pipe,Alloy Tube Seamless Steel Pipe,High Performance Alloy Steel Pipe,Carbon Alloy Steel Seamless Pipe YUHONG GROUP CO.,LIMITED , https://www.jessro-pipefittings.com
Application background: (Why use digital first-line?)
Today, the digital network HD system has gradually been widely used in intelligent security systems with its advantages of ultra-high definition, ultra-high cost performance, remote monitoring, etc. In the future, intelligent security projects, analog systems will be eliminated, digital network HD will Become a new monitoring standard.
The major deficiencies in digital network systems (high cost, technical difficulty, image lag, construction troubles, etc.) have gradually been overcome. At present, the most restrictive network HD system development is the transmission distance of the network cable: the transmission distance of the super 5 network cable is 80 meters. Over 6 types of network cable is 150 meters. If you exceed this distance, you need to increase the number of relays or routing devices to extend the distance. However, as a modern intelligent monitoring system, the actual transmission distance is far beyond this distance. The emergence of digital first-line communication has solved this problem!
Advantages: (Digital first-line pass has the following advantages in addition to the outstanding transmission distance)
1, a line of 16 network cameras
Through the digital one-line device, 100M network traffic can be provided on a common video line or twisted pair line, which can support the transmission of 32 720P images (1 million images); 24 channels of 960P images (1.3 million images) can be transmitted; It can realize the transmission of 16 1080P images (2 million images).
2. Transmission wire diversity:
3, construction is simple / no debugging
The digital first-line device has two built-in transmitting and receiving circuits, each of which has a transmitting and receiving function. The process is very simple, no hardware or software debugging, no IP settings. Connect to the video cable network to use it normally.
4 analog system replacement digital HD system is convenient
Due to the variety of wire selection, all the wires in the analog camera can be used as a medium for digital first-line transmission without re-wiring. Therefore, the analog system is transformed into a digital network HD, and only the front-end camera needs to be replaced, and the digital one-line device can be omitted, thereby eliminating wiring time, manpower, and material resources.
In addition to these four characteristics, it also has:
1. Resolve interference: Digital signal can resist a variety of voltage, frequency conversion, electromagnetic interference, and is suitable for digital monitoring systems such as elevators, workshops, and power stations.
2, 2, flexible networking: can be star, string, tree and other ways to network, eclectic.
3, easy to increase: anytime, anywhere, access to the original digital first-line system, join the transmitter, you can incorporate a new camera point, the relocation, increase point is very simple and easy.
4, the signal coexistence: through the digital one-line, you can combine video, alarm, intercom, control, power and other signals into a line of transmission.
Technical principle:
Digital One-line is an internationally-advanced micro-differential unit calculation method for network digital signal unpacking and integration technology. Each digital packet is divided into 1024 small units, and after recompilation, it is transmitted on the copper closed circuit, and is combined and restored by multiple-in-one or five-in-one combination. Therefore, the requirement for the wire is not high.
The micro-differential unit signal adopts the bidirectional modulation decoupling filtering technology. The digital first-line device has two parts of modulation and demodulation circuits. Like the switch dual-function circuit, each network port has the function of sending and receiving. Therefore, while transmitting the signal of the network camera, it can also receive the control signal sent from the network to achieve two-way operation. Overall, we can combine digital one-line, video line, three-way, etc. into a large network switch, each digital one-line is a network port of the network switch, and the video line is only the internal connection line.
For the current domestic application, it is still a relatively new technology. Similar products are rare. If the telecom uses a dual-core telephone line or the cable broadband is used to transmit the network signal for reference, it will be a few points. similar.
The network switching capacity depends on the processing capability of the network chip, and the network capacity of the digital first-line communication group is about 100-120M/S, which basically satisfies the requirements of the current digital network high-definition, and one video line realizes the transmission of 16-channel images. Of course, through technological innovation or capacity requirements, it is also possible to replace the processing chip and expand the network bandwidth to 1000M/S, but the cost of the installation will increase a lot, and it is worthless from the price/performance ratio.
Application Environment:
Digital One-line is a device that transmits digital network signals, so any network signal can be used.
1. Network camera IPC and network recorder NVR
The network camera is connected to the digital one-line through the network cable, and the digital first-line access is connected to the video line, and the cable is routed in the direction of the monitoring room. In the middle, it is continuously merged with other network cameras and digital one-way through BNC three-way or welding. After the computer room, connect the digital one-line device, and lead the network directly to the NVR.
2, network camera IPC, network video recorder NVR, computer PC, network switch HUB
Many of these devices can be connected through a digital first-line network cable to form a large-scale network switching, secondary switching, etc., which can extend the transmission distance of multiple devices.
3, transmission wire diversity: video cable, cable TV line, telephone line, power line
As long as the copper wire that can realize loop transmission can be used, the difference is only the thickness of the core affects the transmission distance. Of course, in the range of intelligent security monitoring, we recommend coaxial cable, such as SYV, SYWV, etc. Wire.
4, a variety of signals in one line: video signal, audio signal, control signal, POE power supply, alarm signal, etc.
Since the network is compiled, common monitoring signals such as video, control, and alarm can be transmitted at the same time. At the same time, the POE power supply mode can also be provided. However, when the POE is used for power supply, the transmission distance is greatly reduced.
Way of routing
1, point to point
Scope of application: Renovation and upgrade, using the original video cable, network cable, twisted pair cable to achieve the network high-definition system from the analog system.
2, serial wiring
Scope of application: perimeter or new system, using serial connection, a string of 16 network cameras.
3, star wiring
Scope of application: The original line is increased and expanded, and multiple contacts are distributed around one end of the line to connect multiple network cameras.
4, tree wiring
Scope of application: Medium and large-scale projects with a large number of points, flexible combination of points, faces, stars, etc., to form a complex wiring structure.
Device parameters
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project
parameter
Network Interface
RJ45 port 10/100M adaptive
Network capacity
100-120Mbps/s
Data exchange
Two-way exchange
Coaxial input
BNC port 75 ohms
Coaxial output
BNC port 75 ohms
Network light
LED light When the network cable is normally connected, it always lights up.
Communication light
LED light flashes when video line communication is normal
Operating Voltage
DC12V
Working current
150mA
Operating temperature
-40 to 65 degrees
Working humidity
Less than 85%
Equipment size
Length 105mmX width 64mmX height 26mm
equipment weight
0.1kg 
Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn