Today, the digital network HD system is increasingly being adopted in intelligent security systems due to its advantages such as ultra-high definition, excellent cost-performance, and remote monitoring capabilities. In the future, analog systems will gradually be phased out, and digital network HD will become the new standard for surveillance systems.
**Application Background: Why Choose Digital First-Line?**
The digital network HD system has been widely implemented in modern security solutions thanks to its superior performance. As technology continues to evolve, analog systems are no longer viable, and digital network HD is becoming the preferred choice. Despite earlier challenges such as high costs, technical complexity, image lag, and installation difficulties, these issues have been progressively resolved. However, one of the main limitations of current network HD systems is the transmission distance of standard Ethernet cables. For example, Cat5e cables can transmit up to 80 meters, while Cat6 can reach up to 150 meters. Beyond that, additional relays or routing devices are required, which complicates the setup. But with the development of digital first-line communication, this problem is now effectively addressed.
**Advantages of Digital First-Line Communication**
1. **Supports Multiple Cameras on a Single Line:** A single line can support up to 16 high-definition cameras. Using a common video or twisted pair cable, it can carry 100M network traffic, allowing for the transmission of 32 720P images, 24 960P images, or 16 1080P images. 2. **Flexible Transmission Media:** It works with various types of wiring, including coaxial cables, telephone lines, and even power lines, making it highly adaptable. 3. **Easy Installation and No Debugging Required:** The device features built-in transmitting and receiving circuits, eliminating the need for IP configuration, software settings, or complex hardware debugging. Simply connect the video cable, and it's ready to use. 4. **Easy Upgrade from Analog Systems:** Existing analog infrastructure can be reused without rewiring. This allows for a seamless transition from analog to digital HD systems by simply replacing the front-end cameras. In addition to these benefits, digital first-line communication also offers: - **Interference Resistance:** It can withstand voltage fluctuations, frequency changes, and electromagnetic interference, making it ideal for harsh environments like elevators, workshops, and power stations. - **Flexible Networking Options:** It supports star, tree, and chain configurations, offering great flexibility in network design. - **Scalable Expansion:** You can easily add new camera points at any time by connecting an additional transmitter, without disrupting the existing system. - **Multi-Signal Transmission:** Video, audio, alarm, control, and even power (via POE) can all be transmitted over a single line. **Technical Principle** Digital first-line uses advanced micro-differential unit calculation methods to unpack and integrate network signals. Each data packet is divided into 1024 small units, reassembled, and transmitted over copper wires. This reduces the demand for high-quality cabling. The system employs bidirectional modulation and decoupling filtering technology, allowing both signal transmission and reception through the same port, enabling two-way communication. Essentially, each digital first-line device functions as a network switch port, with the video line acting as an internal connection. **Current Application and Market Status** Although still relatively new in domestic applications, digital first-line technology is gaining traction. Similar products are rare, and only a few companies have adopted it. Some telecom providers have experimented with using dual-core phone lines or broadband cables for signal transmission, but these remain limited in scope. **Network Capacity and Performance** The network switching capacity depends on the processing power of the network chip. The digital first-line system typically operates at 100–120 Mbps, which is sufficient for most HD surveillance needs. One line can handle up to 16 channels of video. While upgrading to 1 Gbps is possible by replacing the chip, it significantly increases costs and may not offer a good return on investment. **Application Scenarios** 1. **Network Camera (IPC) and Network Video Recorder (NVR):** Connect the camera via Ethernet, then link it to the digital first-line device, which transmits the signal over coaxial cable to the NVR. 2. **Integration with Other Devices:** Digital first-line can connect multiple devices such as PCs, switches, and NVRs, forming a large-scale network. 3. **Versatile Cabling Options:** It supports various types of copper cables, including coaxial, TV cables, telephone lines, and power lines. Coaxial cables like SYV or SYWV are recommended for optimal performance. 4. **Multi-Signal Transmission:** Video, audio, control, alarms, and even power (POE) can be sent over a single line. However, POE may reduce the effective transmission distance. **Routing Methods** - **Point-to-Point:** Ideal for upgrading existing analog systems using original cabling. - **Serial Wiring:** Suitable for perimeter installations or new systems, supporting up to 16 cameras in a daisy-chain setup. - **Star Configuration:** Best for expanding an existing system with multiple branches. - **Tree Structure:** Used in large projects with many points, allowing flexible combinations of stars, trees, and other topologies. **Device Specifications**
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Editor: Hardware Business Network Information Center | [http://news.chinawj.com.cn](http://news.chinawj.com.cn)
**Application Background: Why Choose Digital First-Line?**
The digital network HD system has been widely implemented in modern security solutions thanks to its superior performance. As technology continues to evolve, analog systems are no longer viable, and digital network HD is becoming the preferred choice. Despite earlier challenges such as high costs, technical complexity, image lag, and installation difficulties, these issues have been progressively resolved. However, one of the main limitations of current network HD systems is the transmission distance of standard Ethernet cables. For example, Cat5e cables can transmit up to 80 meters, while Cat6 can reach up to 150 meters. Beyond that, additional relays or routing devices are required, which complicates the setup. But with the development of digital first-line communication, this problem is now effectively addressed.
**Advantages of Digital First-Line Communication**
1. **Supports Multiple Cameras on a Single Line:** A single line can support up to 16 high-definition cameras. Using a common video or twisted pair cable, it can carry 100M network traffic, allowing for the transmission of 32 720P images, 24 960P images, or 16 1080P images. 2. **Flexible Transmission Media:** It works with various types of wiring, including coaxial cables, telephone lines, and even power lines, making it highly adaptable. 3. **Easy Installation and No Debugging Required:** The device features built-in transmitting and receiving circuits, eliminating the need for IP configuration, software settings, or complex hardware debugging. Simply connect the video cable, and it's ready to use. 4. **Easy Upgrade from Analog Systems:** Existing analog infrastructure can be reused without rewiring. This allows for a seamless transition from analog to digital HD systems by simply replacing the front-end cameras. In addition to these benefits, digital first-line communication also offers: - **Interference Resistance:** It can withstand voltage fluctuations, frequency changes, and electromagnetic interference, making it ideal for harsh environments like elevators, workshops, and power stations. - **Flexible Networking Options:** It supports star, tree, and chain configurations, offering great flexibility in network design. - **Scalable Expansion:** You can easily add new camera points at any time by connecting an additional transmitter, without disrupting the existing system. - **Multi-Signal Transmission:** Video, audio, alarm, control, and even power (via POE) can all be transmitted over a single line. **Technical Principle** Digital first-line uses advanced micro-differential unit calculation methods to unpack and integrate network signals. Each data packet is divided into 1024 small units, reassembled, and transmitted over copper wires. This reduces the demand for high-quality cabling. The system employs bidirectional modulation and decoupling filtering technology, allowing both signal transmission and reception through the same port, enabling two-way communication. Essentially, each digital first-line device functions as a network switch port, with the video line acting as an internal connection. **Current Application and Market Status** Although still relatively new in domestic applications, digital first-line technology is gaining traction. Similar products are rare, and only a few companies have adopted it. Some telecom providers have experimented with using dual-core phone lines or broadband cables for signal transmission, but these remain limited in scope. **Network Capacity and Performance** The network switching capacity depends on the processing power of the network chip. The digital first-line system typically operates at 100–120 Mbps, which is sufficient for most HD surveillance needs. One line can handle up to 16 channels of video. While upgrading to 1 Gbps is possible by replacing the chip, it significantly increases costs and may not offer a good return on investment. **Application Scenarios** 1. **Network Camera (IPC) and Network Video Recorder (NVR):** Connect the camera via Ethernet, then link it to the digital first-line device, which transmits the signal over coaxial cable to the NVR. 2. **Integration with Other Devices:** Digital first-line can connect multiple devices such as PCs, switches, and NVRs, forming a large-scale network. 3. **Versatile Cabling Options:** It supports various types of copper cables, including coaxial, TV cables, telephone lines, and power lines. Coaxial cables like SYV or SYWV are recommended for optimal performance. 4. **Multi-Signal Transmission:** Video, audio, control, alarms, and even power (POE) can be sent over a single line. However, POE may reduce the effective transmission distance. **Routing Methods** - **Point-to-Point:** Ideal for upgrading existing analog systems using original cabling. - **Serial Wiring:** Suitable for perimeter installations or new systems, supporting up to 16 cameras in a daisy-chain setup. - **Star Configuration:** Best for expanding an existing system with multiple branches. - **Tree Structure:** Used in large projects with many points, allowing flexible combinations of stars, trees, and other topologies. **Device Specifications**
| Project | Parameter |
| Network Interface | RJ45 port, 10/100M adaptive |
| Network Capacity | 100–120 Mbps/s |
| Data Exchange | Full-duplex |
| Coaxial Input | BNC port, 75 ohms |
| Coaxial Output | BNC port, 75 ohms |
| Network LED | Always on when connected |
| Communication LED | Flashes when active |
| Operating Voltage | DC 12V |
| Working Current | 150mA |
| Operating Temperature | -40°C to 65°C |
| Humidity | Less than 85% |
| Dimensions | 105mm x 64mm x 26mm |
| Weight | 0.1kg |
Editor: Hardware Business Network Information Center | [http://news.chinawj.com.cn](http://news.chinawj.com.cn)
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