Today, the digital network HD system has gradually become widely adopted in intelligent security systems due to its advantages such as ultra-high definition, high cost-performance, and remote monitoring capabilities. In the future, analog systems will be phased out, and digital network HD is expected to become the new standard in intelligent security projects.
**Application Background: Why go for digital first-line?**
The digital network HD system has gained popularity in intelligent security due to its high resolution, cost-effectiveness, and remote access features. As time goes on, analog systems are being replaced by digital solutions. However, early digital systems faced challenges like high costs, technical complexity, image lag, and installation difficulties. These issues have now been largely resolved. The main limitation today remains the transmission distance of network cables—super 5 cable can transmit up to 80 meters, while category 6 can reach up to 150 meters. Beyond that, additional relays or routers are needed. But modern intelligent systems require much longer distances. That's where digital first-line communication comes in, offering a powerful solution.
**Advantages of Digital First-Line:**
1. **Supports multiple cameras on one line**: With a single video or twisted pair line, it can provide 100M network traffic, supporting up to 16 full HD (1080P) video streams, 24 960P streams, or 32 720P streams.
2. **Flexible wiring options**: It supports various types of cables including coaxial, telephone lines, and power lines, making it highly adaptable.
3. **Easy installation and no configuration required**: The device has built-in transmitting and receiving circuits, eliminating the need for IP settings, software, or hardware debugging. Just connect it and use it.
4. **Easy upgrade from analog systems**: Existing analog wiring can be reused without re-cabling, allowing for a smooth transition to digital HD systems by simply replacing the front-end cameras.
Additional benefits include:
- **Interference resistance**: Digital signals are immune to voltage fluctuations, frequency changes, and electromagnetic interference, making them ideal for environments like elevators, workshops, and power stations.
- **Flexible networking**: Supports star, tree, and chain configurations for easy expansion.
- **Easy scalability**: New devices can be added anytime, with minimal effort.
- **Multi-signal transmission**: Video, audio, control, alarm, and even power (POE) can be transmitted over a single line.
**Technical Principle:**
Digital first-line uses advanced micro-differential unit calculation technology to process and integrate network signals. Each data packet is divided into 1024 units, reassembled, and transmitted over copper cables. This reduces the demand on the wiring. The signal uses bidirectional modulation and decoupling filtering technology, allowing both sending and receiving functions through separate circuits. This enables two-way communication, making each digital first-line device function like a network port.
Currently, this is still a relatively new technology in China, with limited similar products. If telecom companies use dual-core telephone lines or cable broadband for reference, it’s still quite rare.
The network switching capacity depends on the processing power of the chip, with current capacities around 100–120 Mbps. This is sufficient for most HD applications. One line can support up to 16 camera channels. While it’s possible to upgrade to 1 Gbps by changing chips, the cost increases significantly, making it less cost-effective.
**Application Scenarios:**
1. **IPC and NVR connection**: Network cameras connect via Ethernet to the digital first-line device, which then connects to the video line leading to the monitoring room. Multiple cameras can be merged using BNC T-connectors or welding. At the end, connect to the NVR for recording.
2. **Large-scale network setup**: Connect multiple devices like PCs, switches, and NVRs through digital first-line cables to create a scalable network.
3. **Diverse cabling options**: Supports coaxial, TV cable, phone line, and power lines. Coaxial cables like SYV and SYWV are recommended for security applications.
4. **Multi-signal transmission**: Video, audio, control, POE power, and alarms can all be sent through a single line. Note that POE reduces transmission distance.
**Routing Methods:**
1. **Point-to-point**: Ideal for upgrading existing systems using original cables.
2. **Series wiring**: Suitable for perimeter or new installations, connecting up to 16 cameras in a row.
3. **Star topology**: Useful for expanding an existing network, connecting multiple devices from a central point.
4. **Tree topology**: Best for large projects with many points, allowing flexible combinations of stars, trees, and more.
**Device Specifications:**
Source: http://news.chinawj.com.cn
Editor: Hardware Business Network Information Center | http://news.chinawj.com.cn
**Application Background: Why go for digital first-line?**
The digital network HD system has gained popularity in intelligent security due to its high resolution, cost-effectiveness, and remote access features. As time goes on, analog systems are being replaced by digital solutions. However, early digital systems faced challenges like high costs, technical complexity, image lag, and installation difficulties. These issues have now been largely resolved. The main limitation today remains the transmission distance of network cables—super 5 cable can transmit up to 80 meters, while category 6 can reach up to 150 meters. Beyond that, additional relays or routers are needed. But modern intelligent systems require much longer distances. That's where digital first-line communication comes in, offering a powerful solution.
**Advantages of Digital First-Line:**
1. **Supports multiple cameras on one line**: With a single video or twisted pair line, it can provide 100M network traffic, supporting up to 16 full HD (1080P) video streams, 24 960P streams, or 32 720P streams.
2. **Flexible wiring options**: It supports various types of cables including coaxial, telephone lines, and power lines, making it highly adaptable.
3. **Easy installation and no configuration required**: The device has built-in transmitting and receiving circuits, eliminating the need for IP settings, software, or hardware debugging. Just connect it and use it.
4. **Easy upgrade from analog systems**: Existing analog wiring can be reused without re-cabling, allowing for a smooth transition to digital HD systems by simply replacing the front-end cameras.
Additional benefits include:
- **Interference resistance**: Digital signals are immune to voltage fluctuations, frequency changes, and electromagnetic interference, making them ideal for environments like elevators, workshops, and power stations.
- **Flexible networking**: Supports star, tree, and chain configurations for easy expansion.
- **Easy scalability**: New devices can be added anytime, with minimal effort.
- **Multi-signal transmission**: Video, audio, control, alarm, and even power (POE) can be transmitted over a single line.
**Technical Principle:**
Digital first-line uses advanced micro-differential unit calculation technology to process and integrate network signals. Each data packet is divided into 1024 units, reassembled, and transmitted over copper cables. This reduces the demand on the wiring. The signal uses bidirectional modulation and decoupling filtering technology, allowing both sending and receiving functions through separate circuits. This enables two-way communication, making each digital first-line device function like a network port.
Currently, this is still a relatively new technology in China, with limited similar products. If telecom companies use dual-core telephone lines or cable broadband for reference, it’s still quite rare.
The network switching capacity depends on the processing power of the chip, with current capacities around 100–120 Mbps. This is sufficient for most HD applications. One line can support up to 16 camera channels. While it’s possible to upgrade to 1 Gbps by changing chips, the cost increases significantly, making it less cost-effective.
**Application Scenarios:**
1. **IPC and NVR connection**: Network cameras connect via Ethernet to the digital first-line device, which then connects to the video line leading to the monitoring room. Multiple cameras can be merged using BNC T-connectors or welding. At the end, connect to the NVR for recording.
2. **Large-scale network setup**: Connect multiple devices like PCs, switches, and NVRs through digital first-line cables to create a scalable network.
3. **Diverse cabling options**: Supports coaxial, TV cable, phone line, and power lines. Coaxial cables like SYV and SYWV are recommended for security applications.
4. **Multi-signal transmission**: Video, audio, control, POE power, and alarms can all be sent through a single line. Note that POE reduces transmission distance.
**Routing Methods:**
1. **Point-to-point**: Ideal for upgrading existing systems using original cables.
2. **Series wiring**: Suitable for perimeter or new installations, connecting up to 16 cameras in a row.
3. **Star topology**: Useful for expanding an existing network, connecting multiple devices from a central point.
4. **Tree topology**: Best for large projects with many points, allowing flexible combinations of stars, trees, and more.
**Device Specifications:**
| Project | Parameter |
| Network Interface | RJ45 port, 10/100M adaptive |
| Network Capacity | 100–120 Mbps/s |
| Data Exchange | Two-way exchange |
| Coaxial Input | BNC port, 75 ohms |
| Coaxial Output | BNC port, 75 ohms |
| Network Light | LED light stays on when connected |
| Communication Light | Flashes when video line is working |
| Operating Voltage | DC 12V |
| Working Current | 150mA |
| Operating Temperature | -40°C to 65°C |
| Working Humidity | Less than 85% |
| Dimensions | 105mm × 64mm × 26mm |
| Weight | 0.1kg |
Source: http://news.chinawj.com.cn
Editor: Hardware Business Network Information Center | http://news.chinawj.com.cnHyperspectral Camera (line-scanning)
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