Software Defined Network (SDN) is a new type of network architecture that implements separate network control and forwarding, forming a logically centralized unified controller, and then opens a software programmable interface for service calls on the controller to achieve flexible configuration. The purpose of the network. In the cloud computing data center, providing virtual resource services is its most important technical realization, and the network is also provided as a service to customers. The network needs to provide dynamic, on-demand, isolated network environment and custom network service chain connection services for different users and applications. These are the traditional network architectures that cannot be met, and SDN was born because of this.
Speaking of SDN, I have to mention Professor Nick from Stanford University. SDN originated from the Clean Slate project of Professor Nick's team. In 2006, the team of Professor Nick's team first proposed a logically centralized enterprise security solution that opened the door to centralized control to solve security problems. In 2007, Professor Nick and his team members founded Nicira in Silicon Valley, the first startup in SDN history. In 2011, the Open Network Foundation ONF was born and an open network summit was held. SDN has only been in existence for ten years since its birth. The real application in the network was in 2012, and it was deployed in the data center of Google. Although SDN was not born for a long time, it has been greatly developed. SDN-related startups have sprung up. Traditional network equipment vendors have also thrown olive branches to SDN. Major data centers and network operators have launched SDN. Technical research and various attempts are intended to make a big difference in the era of SDN. SDN already has a relatively complete technical system support, and the Openflow protocol is the core technology of its implementation. However, because everyone has different understandings of SDN, the implemented controller software can only control their own hardware devices, and can not form general-purpose software, and this is also achieved in order to achieve competitive advantage, exclude other software manufacturers, obtain More markets, which make SDN technology landing relatively slow, to some extent affect the development of SDN. Even so, SDN is still developing rapidly in technical theory. Soon it also has brothers and sisters SD-WAN and SD-branch, so SDN and SD-WAN, SD-branch formed three brothers.
The full name of SD-WAN is a software-defined WAN. In 2015, it became a hot topic in SDN technology, and the first SD-WAN product appeared on the market. SD-WAN inherits the concepts of SDN control and forwarding separation and centralized control. It deploys SDN technology in WAN networks, mainly uses software advantages to improve network performance and reduce costs, while ensuring security and stability and easy deployment. The basic principle of SD-WAN can be understood as establishing a "virtual network" on top of one or more different physical networks or network services, as long as the mapping between virtual and physical can be done. There is no need to know what technology is being used for things inside and outside the virtual network. In the past, we mentioned that SDN is mainly used in data centers and LANs, while SD-WAN extends SDN to WANs. There are many protocols in WANs, which are different from Ethernet protocols in LANs, so it is not a simple migration. Instead, you need to do some specific design for the WAN. SD-WAN can operate by measuring basic network traffic metrics such as latency, packet loss, jitter, and availability. With this data, SD-WAN can actively respond to real-time network conditions and choose the best path for each packet. SD-WAN has a central controller concept for global network visibility. Network administrators use the controller architecture to create policies and allow the system to take action without explicit manual change control. This controller platform performs policy-based forwarding based on current WAN conditions and complete information on enterprise application preferences, enabling immediate global changes without the need to manually log in to each router. The SD-WAN device is not necessarily a dedicated device. The SD-WAN device can be a simple x86 server containing computing resources for application policies and a 1GE NIC.
SD-branch stands for Software Locating Branch, which combines WANs and branches into a simplified network, security, and WAN architecture by consolidating multiple functions into a single software-based IP service platform. The fundamental idea is to fold all branch network functions onto a single branch network platform. In the SD-branch mode, both wired and wireless functions are combined into a unified and centralized management framework. SD-branch virtualizes the connectivity, networking, and security capabilities of all or most branch offices while providing centralized cloud-based management. SD-branch technology goes beyond SD-WAN-based connectivity and software to define a complete service stack in a branch office.
The SD-branch architecture delivers compelling benefits, including efficient bandwidth utilization, better application quality of service, and greater security, enabling hosted third-party virtualized networking capabilities, allowing operations personnel to effectively Exclude, protect, and upgrade remote branches of your network. SD-branch is typically composed of a virtualized service platform, VNF software, and centralized management and visualization infrastructure services, providing a complete set of integrated network and security features that run on low-cost devices. Enterprises can easily deploy SD-branch to solve complex WAN and branch complexity challenges. SD-branch is a software-defined network technology that has just been proposed. It is still in its infancy. The biggest difference between SD-branch and SD-WAN is that SD-branch considers security issues and solves the biggest security risks in the network, including software-defined security SD. -Security content. By extending the capabilities provided by SD-WAN, SD-Branch provides a true cloud-like operating model in enterprise branch offices, enabling providers to define on-premises multi-tenant SD-Branch/SD-WAN software using template services Platform and deployment process.
After the above introduction, it is not difficult to find that SDN has evolved its own system from a short period of ten years, extending from the data center to the WAN, so as to extend to the entire network, including edge devices in the network branch. Now SDN has two small brothers, SD-WAN and SD-branch. I believe that there will be more brothers in the future, and the SDN technology will become more and more abundant and more and more grounded. SDN will no longer be an Ethernet network technology, but all network protocols rely on its development technology, such as storage networks. Software definition concepts have been introduced early, and almost all aspects of the data center are related to software definition. . The SDX concept is also taking root in an increasingly wide network, and the family size of SDX has grown larger and larger. SDN technology is a global and disruptive network transformation technology. It uses IT technology to transform traditional closed networks, which brings opportunities for network development.
Refrigerator Condenser Evaporator
1. Main material:
Rolling welded steel pipe: OD 4.76 to 8
Wall thickness:0.5- 0.7
Low carbon steel wire OD 1.0 to 1.8
Bracket:
Steel plate (SPCC) thickness: 0.6 to 1.5
Steel plate (SPCC) thickness: 0.3 to 0.4
2.Structure:
Flat type of Wire On Tube Condenser used at the back
Bended or spiral type of wire on tube condenser used at the bottom
Wrapped type of tube embedded on plate
3.Technical ability:
Wire pitch: ≥ 5mm
4.Performance:
Surface with electrophoresis coating to prevent the corrosion
Inner cleanliness can meet the requirements of CFC and R134a cooling system
Can satisfy the cooling capability requirements
Condenser Evaporator,Evaporator And Condenser,Refrigerator Evaporator,Compressor Condenser Evaporator
FOSHAN SHUNDE JUNSHENG ELECTRICAL APPLIANCES CO.,LTD. , https://www.junshengcondenser.com