**1. Market Background**
With the rapid advancement of computer and network technologies, especially in video codec development, improvements in computing power, and the widespread availability of broadband, real-time internet-based video networks have become increasingly common across various industries and government sectors. In fields such as banking, broadcasting, oil, and power, numerous successful implementations have already taken place.
When we think about real-time video applications over the internet, we often consider video conferencing, live TV streaming, distance learning, and similar services. These applications demand high performance from both hardware and software, requiring high frame rates and low bitrates. This necessitates strong processing capabilities, including advanced algorithms and efficient chipsets. As a result, specialized and costly equipment is often required to meet these demands.
In the case of network-based digital video surveillance systems, especially those involving security, the industry's nature leads to a large number of data collection points. This means that many encoding devices must be deployed, making cost a more sensitive factor compared to other real-time video applications.
Traditionally, digital video monitoring systems were based on local or private networks. However, real-world conditions often make it difficult to maintain such stable environments, limiting the ability of system integrators to provide comprehensive solutions.
For example, a bank’s ATM centralized digital monitoring system may require an internet-based solution, combining broadband with narrowband support. The original ATM machines typically rely on private network connections for business data and 24/7 video surveillance. Balancing both stable data transmission and smooth video quality on the same network is challenging. Therefore, using broadband for video transmission becomes necessary. Additionally, since not all ATMs need continuous video transmission, many only activate monitoring when an issue occurs or during periodic checks. In such cases, renting a dedicated line year-round is unnecessary, and alternatives like ADSL, ISDN, or even dial-up can suffice.
Over the past few years, domestic manufacturers have been developing high-performance, cost-effective video and audio compression cards and network monitoring equipment, enabling the deployment of internet-based digital video surveillance systems, such as the ATM centralized monitoring system described above.
**2. Overview of Requirements**
As a complete solution, one key challenge is handling dynamic IP addresses. Whether through regular phone lines, ISDN, or ADSL, if a dynamic IP access method is used, this issue arises. Dynamic IP access means users obtain an IP address dynamically via virtual dial-up technology. Each time a user connects to the internet, the ISP assigns a public IP address. However, this IP changes each time the connection is made, making it difficult to establish consistent communication.
If only one side (such as the ATM) or the other (like the monitoring center) uses dynamic IP, the problem is easier to solve. In point-to-point communication, if one party knows the IP address in advance, they can initiate a handshake and exchange information. But if both sides use dynamic IPs, it becomes complicated. After connecting, neither party knows the other's IP address, making further operations impossible.
**3. Solution Implementation and Comparison**
Below are two commonly used solutions to address dynamic IP issues.
**1> Apply for a Dynamic Domain Name**
Many companies offer dynamic domain name services online. A dynamic domain name links a fixed domain to a changing IP address in real time. This allows others to always access the device via the domain name, regardless of the current IP.
As shown in the diagram, choosing a service provider allows you to register for a free domain name. Installing the provided software ensures that the domain automatically updates whenever the IP changes. This makes it easy to integrate into existing systems that rely on fixed IP addresses.
The advantages of this approach include simple software development, stable performance, and relatively low costs for small systems. However, for larger systems with hundreds of monitoring points, the annual service fees can add up significantly. Also, customization options are limited.
**2> Custom IP Address Resolution Server**
This method involves either developing your own resolution server or purchasing a module. It works by assigning aliases to each monitoring point and the center. When a device comes online, it sends its IP and alias to the server, which stores and retrieves the information when needed.
This solution offers greater flexibility and cost savings for large systems. While it requires more development work, it also allows for additional features like authentication, billing, and group management. It can even use dynamic domains for added reliability.
Other methods exist, but these two are the most mature and practical.
FTTH Node,passive optical node,active optical node,ftth node with wdm,mini optical receiver
Shenzhen Runtop Technology Co.LTD , https://www.runtoptech.com