With the gradual improvement of the domestic network construction foundation, the network bandwidth has been greatly improved. At present, the penetration rate of ADSL broadband in China has reached 21%. Gigabit networks have been built as infrastructures in buildings in developed coastal regions, and the rental fees for optical fiber lines have also been greatly reduced; the development of network technologies has brought about the interconnection of DVR equipment. Centralized management provides mature conditions. Through the IP network, all devices accessing the network can be managed in a unified manner, and more users can browse the video of the monitoring point remotely through the network.
In the wave of networking, security technology innovation related to it has become a new focus in the market. The characteristics of networking will inevitably require a new generation of DVR products to have more network functions and stronger performance. This is also a challenge faced by DVR manufacturers. The demand for network monitoring by users in major industries such as public security, finance, education, and energy in the monitoring market has also become mainstream. The current mainstream DVRs in the market have made many improvements in TCP/IP protocol support and dynamic address support, and support UPnP network penetration, remote management, and remote access.
So, what kind of network technology does the DVR need to integrate in the face of the wave of networkization?
The basic network technology that DVR should have is TCP/IP, the abbreviation of Transmission Control Protocol/Internet Protocol. The Chinese translation is called Transmission Control Protocol/Internet Protocol, also called Network Communication Protocol. This protocol is the basis of the Internet's most basic protocol and Internet Internet. Although TCP/IP includes two protocols in terms of name, Transmission Control Protocol (TCP) and Internet Protocol (IP), TCP/IP is actually A set of protocols, which includes hundreds of protocols with various functions, such as: remote login, file transfer, and e-mail, and the TCP protocol and IP protocol are two basic and important protocols that ensure the complete transmission of data. Generally speaking, TCP/IP is the Internet protocol family, not just TCP and IP, because TCP/IP protocol includes many protocols such as TCP, IP, UDP, ICMP, RIP, TELNET FTP, SMTP, ARP, and TFTP. These protocols are called together. For the TCP/IP protocol.
It can be seen that a DVR with complete network functions does not only refer to TCP and IP protocols, but also needs a complete TCP/IP protocol cluster. This can be called a network hard disk recorder. There are many typical applications in the common TCP/IP protocol cluster of DVR. Here are two more common two types:
NTP (Network Time Protocol) is a protocol used to synchronize the computer's time. Video surveillance information is an important source of information for public security agencies to trace criminals, so the accuracy of time requirements is very high. At present, the network timing function supported by the DVR is realized by the NTP protocol.
The Simple Mail Transfer Protocol (SMTP) is a protocol that provides reliable and efficient email transmission. DVRs with the SMTP protocol can send alarm messages via email to your mailbox.
Network Technology for Internet-based Network Monitoring With the continuous development and improvement of computer network technology and the increasing popularity of broadband, Internet-based network video surveillance solutions should be used in numerous monitoring systems. With regard to the network video surveillance systems involved in security, in many places, prices have become a relatively sensitive factor. The previous network video surveillance systems were basically based on local area networks or fiber optic private networks. However, some monitoring sites cannot guarantee such network conditions. If the leased optical fiber lines are leased every year, the annual investment required is too large. However, ADSL broadband is now very popular and the overall cost is very low. Some sites that do not need 24 hours of uninterrupted external network browsing can Use this method to save money. So, what kind of technology does DVR need to have for ADSL environment applications?
1, PPPoE and DDNS
PPPoE is an abbreviation of point-to-point protocol over ethernet. It allows an Ethernet host to connect to a remote access concentrator through a simple bridging device. The popular broadband access method, adsl, uses the PPPoE protocol.
However, ADSL using dynamic IP access will encounter such a problem. Every time a user connects to the Internet through ADSL dial-up, the ISP usually assigns a public IP address to the user. At this time, other users on the Internet can access the computer through this IP address. However, because this IP address is dynamic, that is, once disconnected, the ISP will assign another different public IP address the next time it connects to the Internet. This leads to the fact that when the user accesses the DVR through the Internet, the on-site personnel must check the assigned IP address each time, and then visit. Who is willing to use this complex access method? Therefore, DDNS technology has become one of the necessary network technologies for DVRs.
DDNS (Dynamic Domain Name Server) is the acronym for Dynamic Domain Name Service! DDNS is to map the user's dynamic IP address to a fixed domain name resolution service. Each time the user connects to the network, the client program will transfer the host's dynamic IP address to the server program on the service provider host through information transfer. The service provider program is responsible for providing DNS services and implementing dynamic domain name resolution.
DVRs adopting DDNS technology connect to the Internet automatically after dial-up through PPPoE, and obtain dynamic public IP addresses through DHCP. The domain name, user name, and password obtained from the domain name service provider (eg Peanut Shell, 3322.org) are input to the monitoring device, and the external network user can access the monitoring device through this domain name.
2, UPnP
What is UPnP? Universal Plug and Play. It is easy to understand the technology that makes surveillance products go to the civilian market. The professional video surveillance system in the past is very professional. When remotely accessing the Internet network, you can use the port mapping, domain name resolution, and other technologies to set the router so that the monitoring system can access the external network. However, in the era of monitoring products for civilian use, it is not practical to set routers in the cell (because the routing of ordinary users in a cell is inaccessible), and not every ordinary user is set up. Then UPnP technology is a good solution to this problem. Its network address translation and NAT traversal technology help the user realize the need to directly input the monitoring device address and then directly browse the monitoring screen. Currently mainstream IPC vendors in the market have already supported this technology such as AXIS 211 and Tiandy TC-NC8100S. However, DVR manufacturers use this technology is still relatively small, small number of DVR products still need UPnP technology to improve product competitiveness in the future.
DVR based on 3G network technology
With the commercialization of 3G networks around the world, video surveillance systems are gradually being transformed from wired broadband video transmission to wireless video surveillance. Up to 2M of 3G network bandwidth will solve the problem of bandwidth in the 2.5G era, which will make video quality clearer and transmit. more stable.
With a video surveillance system built on a 3G network, once an alarm occurs on the surveillance site, the front-end device sends a video shot to your mobile phone. You can access the surveillance video on the mobile phone to perform real-time browsing, control, and video recording. Although traditional PC terminals can also be achieved, it is far less mobile than mobile phones.
Currently, DVR based on 3G technology has two typical applications:
1. Car DVR with built-in 3G transmission module
Based on 3G technology embedded in the car, built-in 3G transmitter module to enhance the overall stability and versatility of function, not only can record the entire process of vehicle operation through hard disk storage locally, but also can send video in real time through the 3G network to the Internet network. in. The 3G network transmission wireless monitoring system adopts a wireless network for audio and video transmission. The 3G network can support three different transmission speeds of at least 2M/s, 384K/s, and 144K/s in indoor, outdoor, and driving environments. In this way, the user can smoothly and clearly see the monitoring screen and provide technical protection, which avoids the numerous restrictions brought by the wired network. Currently, most of the automotive embedded manufacturers use H. The 264 compression algorithm has a low compression ratio and can perform video transmission in a better 3G network state.
In the remote bus emergency command center, commanders can monitor and manage vehicles through the Internet, which can effectively prevent emergencies and ensure the safety of workers and passengers. The vehicle management unit has become a customer emergency command system. The administrative departments can also achieve more efficient management of vehicles and improve the management and service capabilities of the government and the public transport operators.
2. The network monitoring of mobile phones through 3G mobile phones Video surveillance has always been a goal that users in the video surveillance industry hope to achieve. The ideal mobile video surveillance can be used anywhere a user is anywhere in the world. At any time, just look at the mobile phone you want to see.
Now the development of 3G technology makes the previous network bottleneck gradually solved. For example, before the 2G network 100k below the bandwidth can not transmit clear, smooth video, basically only used to capture images, and now 3G network bandwidth who fully meet the needs of ordinary monitoring. In addition, China Telecom's CDMA EVDO adopts a pay-per-time billing model, which avoids the high cost caused by the video surveillance's high-traffic bandwidth.
In fact, 3G mobile phones access DVR browsing video and ordinary ADSL access DVR principle is the same, all through the domain name resolution service to access the DVR. The only difference between the mobile operating system and our operating system, the corresponding software, plug-ins need to be redesigned. For example, Tiandiweiye provides customers with mobile phone server software and jad or jar format mobile plug-ins, and installs mobile phone plug-ins on customers' mobile phones so that they can use mobile phones and efficiently and quickly access mobile phone server software to front-end DVR hosts.
Conclusion With the development of network technology, the entire video surveillance industry has entered the era of networking, and the demand for networked functions and network adaptability of DVRs has become higher and higher. In the next few years, DVR systems will face the impact of network video products. In the next one to two years, a large number of traditional video surveillance systems will be waiting for updates. A considerable number of analog cameras will continue to be used in surveillance systems, but IP cameras Constantly develop the space in the occupied market. Therefore, DVR networking is an inevitable trend, and the final DVR networked product form is constantly evolving. It is believed that in the continuous development and improvement, DVRs with stability and networking will still occupy half of the field of video surveillance. (Author: Tianjin Tiandi Weiye Digital Technology Co., Ltd.)
In the wave of networking, security technology innovation related to it has become a new focus in the market. The characteristics of networking will inevitably require a new generation of DVR products to have more network functions and stronger performance. This is also a challenge faced by DVR manufacturers. The demand for network monitoring by users in major industries such as public security, finance, education, and energy in the monitoring market has also become mainstream. The current mainstream DVRs in the market have made many improvements in TCP/IP protocol support and dynamic address support, and support UPnP network penetration, remote management, and remote access.
So, what kind of network technology does the DVR need to integrate in the face of the wave of networkization?
The basic network technology that DVR should have is TCP/IP, the abbreviation of Transmission Control Protocol/Internet Protocol. The Chinese translation is called Transmission Control Protocol/Internet Protocol, also called Network Communication Protocol. This protocol is the basis of the Internet's most basic protocol and Internet Internet. Although TCP/IP includes two protocols in terms of name, Transmission Control Protocol (TCP) and Internet Protocol (IP), TCP/IP is actually A set of protocols, which includes hundreds of protocols with various functions, such as: remote login, file transfer, and e-mail, and the TCP protocol and IP protocol are two basic and important protocols that ensure the complete transmission of data. Generally speaking, TCP/IP is the Internet protocol family, not just TCP and IP, because TCP/IP protocol includes many protocols such as TCP, IP, UDP, ICMP, RIP, TELNET FTP, SMTP, ARP, and TFTP. These protocols are called together. For the TCP/IP protocol.
It can be seen that a DVR with complete network functions does not only refer to TCP and IP protocols, but also needs a complete TCP/IP protocol cluster. This can be called a network hard disk recorder. There are many typical applications in the common TCP/IP protocol cluster of DVR. Here are two more common two types:
NTP (Network Time Protocol) is a protocol used to synchronize the computer's time. Video surveillance information is an important source of information for public security agencies to trace criminals, so the accuracy of time requirements is very high. At present, the network timing function supported by the DVR is realized by the NTP protocol.
The Simple Mail Transfer Protocol (SMTP) is a protocol that provides reliable and efficient email transmission. DVRs with the SMTP protocol can send alarm messages via email to your mailbox.
Network Technology for Internet-based Network Monitoring With the continuous development and improvement of computer network technology and the increasing popularity of broadband, Internet-based network video surveillance solutions should be used in numerous monitoring systems. With regard to the network video surveillance systems involved in security, in many places, prices have become a relatively sensitive factor. The previous network video surveillance systems were basically based on local area networks or fiber optic private networks. However, some monitoring sites cannot guarantee such network conditions. If the leased optical fiber lines are leased every year, the annual investment required is too large. However, ADSL broadband is now very popular and the overall cost is very low. Some sites that do not need 24 hours of uninterrupted external network browsing can Use this method to save money. So, what kind of technology does DVR need to have for ADSL environment applications?
1, PPPoE and DDNS
PPPoE is an abbreviation of point-to-point protocol over ethernet. It allows an Ethernet host to connect to a remote access concentrator through a simple bridging device. The popular broadband access method, adsl, uses the PPPoE protocol.
However, ADSL using dynamic IP access will encounter such a problem. Every time a user connects to the Internet through ADSL dial-up, the ISP usually assigns a public IP address to the user. At this time, other users on the Internet can access the computer through this IP address. However, because this IP address is dynamic, that is, once disconnected, the ISP will assign another different public IP address the next time it connects to the Internet. This leads to the fact that when the user accesses the DVR through the Internet, the on-site personnel must check the assigned IP address each time, and then visit. Who is willing to use this complex access method? Therefore, DDNS technology has become one of the necessary network technologies for DVRs.
DDNS (Dynamic Domain Name Server) is the acronym for Dynamic Domain Name Service! DDNS is to map the user's dynamic IP address to a fixed domain name resolution service. Each time the user connects to the network, the client program will transfer the host's dynamic IP address to the server program on the service provider host through information transfer. The service provider program is responsible for providing DNS services and implementing dynamic domain name resolution.
DVRs adopting DDNS technology connect to the Internet automatically after dial-up through PPPoE, and obtain dynamic public IP addresses through DHCP. The domain name, user name, and password obtained from the domain name service provider (eg Peanut Shell, 3322.org) are input to the monitoring device, and the external network user can access the monitoring device through this domain name.
2, UPnP
What is UPnP? Universal Plug and Play. It is easy to understand the technology that makes surveillance products go to the civilian market. The professional video surveillance system in the past is very professional. When remotely accessing the Internet network, you can use the port mapping, domain name resolution, and other technologies to set the router so that the monitoring system can access the external network. However, in the era of monitoring products for civilian use, it is not practical to set routers in the cell (because the routing of ordinary users in a cell is inaccessible), and not every ordinary user is set up. Then UPnP technology is a good solution to this problem. Its network address translation and NAT traversal technology help the user realize the need to directly input the monitoring device address and then directly browse the monitoring screen. Currently mainstream IPC vendors in the market have already supported this technology such as AXIS 211 and Tiandy TC-NC8100S. However, DVR manufacturers use this technology is still relatively small, small number of DVR products still need UPnP technology to improve product competitiveness in the future.
DVR based on 3G network technology
With the commercialization of 3G networks around the world, video surveillance systems are gradually being transformed from wired broadband video transmission to wireless video surveillance. Up to 2M of 3G network bandwidth will solve the problem of bandwidth in the 2.5G era, which will make video quality clearer and transmit. more stable.
With a video surveillance system built on a 3G network, once an alarm occurs on the surveillance site, the front-end device sends a video shot to your mobile phone. You can access the surveillance video on the mobile phone to perform real-time browsing, control, and video recording. Although traditional PC terminals can also be achieved, it is far less mobile than mobile phones.
Currently, DVR based on 3G technology has two typical applications:
1. Car DVR with built-in 3G transmission module
Based on 3G technology embedded in the car, built-in 3G transmitter module to enhance the overall stability and versatility of function, not only can record the entire process of vehicle operation through hard disk storage locally, but also can send video in real time through the 3G network to the Internet network. in. The 3G network transmission wireless monitoring system adopts a wireless network for audio and video transmission. The 3G network can support three different transmission speeds of at least 2M/s, 384K/s, and 144K/s in indoor, outdoor, and driving environments. In this way, the user can smoothly and clearly see the monitoring screen and provide technical protection, which avoids the numerous restrictions brought by the wired network. Currently, most of the automotive embedded manufacturers use H. The 264 compression algorithm has a low compression ratio and can perform video transmission in a better 3G network state.
In the remote bus emergency command center, commanders can monitor and manage vehicles through the Internet, which can effectively prevent emergencies and ensure the safety of workers and passengers. The vehicle management unit has become a customer emergency command system. The administrative departments can also achieve more efficient management of vehicles and improve the management and service capabilities of the government and the public transport operators.
2. The network monitoring of mobile phones through 3G mobile phones Video surveillance has always been a goal that users in the video surveillance industry hope to achieve. The ideal mobile video surveillance can be used anywhere a user is anywhere in the world. At any time, just look at the mobile phone you want to see.
Now the development of 3G technology makes the previous network bottleneck gradually solved. For example, before the 2G network 100k below the bandwidth can not transmit clear, smooth video, basically only used to capture images, and now 3G network bandwidth who fully meet the needs of ordinary monitoring. In addition, China Telecom's CDMA EVDO adopts a pay-per-time billing model, which avoids the high cost caused by the video surveillance's high-traffic bandwidth.
In fact, 3G mobile phones access DVR browsing video and ordinary ADSL access DVR principle is the same, all through the domain name resolution service to access the DVR. The only difference between the mobile operating system and our operating system, the corresponding software, plug-ins need to be redesigned. For example, Tiandiweiye provides customers with mobile phone server software and jad or jar format mobile plug-ins, and installs mobile phone plug-ins on customers' mobile phones so that they can use mobile phones and efficiently and quickly access mobile phone server software to front-end DVR hosts.
Conclusion With the development of network technology, the entire video surveillance industry has entered the era of networking, and the demand for networked functions and network adaptability of DVRs has become higher and higher. In the next few years, DVR systems will face the impact of network video products. In the next one to two years, a large number of traditional video surveillance systems will be waiting for updates. A considerable number of analog cameras will continue to be used in surveillance systems, but IP cameras Constantly develop the space in the occupied market. Therefore, DVR networking is an inevitable trend, and the final DVR networked product form is constantly evolving. It is believed that in the continuous development and improvement, DVRs with stability and networking will still occupy half of the field of video surveillance. (Author: Tianjin Tiandi Weiye Digital Technology Co., Ltd.)