Yunke China

Yunke China Information Technology Limited (Earlier name as DIGITAL CHINA NETWORKS LIMITED , DCN for short), possessing proprietary network brand and intellectual property. It is a new-generation global provider for data communications equipments,solution and infrastructure of smart city. Deriving from Lenovo, DCN was launched into the network market in 1997 with company philosophy of “Client-oriented, Technology-driven and Service-preference”. Based on independent development and sustainable innovation, DCN is continuous to provide networks products with intelligent, reliable and integrated network products, solution and quality service for the clients.


Industrial Ethernet redundancy

Due to the high reliability requirements of industrial control networks in industrial environments, redundant functions of Industrial Ethernet emerged. From rapid spanning tree redundancy (RSTP), ring redundancy (RapidRing) to trunk redundancy (Trunking), have their own different strengths and characteristics, control engineers can choose according to their own requirements. To help you better understand and learn the features of Industrial Ethernet redundancy technology, let us first review the evolution of the following Ethernet devices.
I believe most people are familiar with the hub. Many people use this simple device to connect a variety of Ethernet-based devices such as personal computers, programmable controllers and the like. The hub receives the message from one of the ports and broadcasts the message to all the other ports.
For each message from either port, the hub will pass it to each of the other ports. In terms of messaging, hubs are slow and inefficient, and message collisions may occur. However, hubs are simple to use – they are actually plug-and-play. Hubs do not have any flashy features and no redundancy.
din rail gigabit ethernet switch
The development of hubs has created a device called unmanaged switches. It enables routing of messages from one port to another, and is more intelligent than hubs. Unmanaged switches automatically probe the network speed of each network device. In addition, it has a feature called “MAC Address Table,” which identifies and memorizes devices in the network.
In other words, if port 2 receives a message with a specific ID, then the switch will then send all messages with that particular ID to port 2. This intelligence avoids message collisions and improves transmission performance, a relative improvement over hubs. However, unmanaged switches can not implement any form of communication detection and redundant configuration capabilities.
Managed switch
The next generation of Ethernet connectivity devices is the managed switch. Compared to hubs and unmanaged switches, managed switches have more and more sophisticated features and are much more expensive – typically three to four times more than an unmanaged switch. Managed switches provide more functionality and are usually fully configured through a web-based interface. It can automatically interact with network devices, users can also manually configure the speed of each port and flow control. Some older devices may not be able to use automatic interaction, so manual configuration is essential.

carrier fiber ethernet Switch

Smart grid, is the future direction of power grid construction. The application of IE switches in building power grids can improve the depth and breadth of information in all aspects of the smart grid in all aspects and provide high availability support for intelligentizing the power system as well as information flow, traffic flow, and power flow convergence.
Power system on-line monitoring is an indispensable part of the future smart grid. Smart grid not only means intelligent control, but also intelligent operation and management of power grid information. Only truly intelligent management of information, intelligent control can be achieved.
In the process of building a smart grid, on-line monitoring technology for power equipment has developed rapidly. Most of the substation equipment, generators, cables, lines and so on have online monitoring projects.
Industrial Ethernet switches as the most important distribution network communications solutions, the following from the agreement, networking methods for a simple analysis.
The standardization of its industrial Ethernet switches has been completed, including the underlying protocols, network redundancy protocols, management protocols, and accurate network clock transmission protocols. Interoperability among different vendors is good and hybrid networking can be achieved. -40 ℃ ~ 85 ℃ working range can fully meet the industrial needs, to meet the distribution network construction.
Industrial Ethernet switches mainly use piecewise redundancy, intersecting rings, tangent rings and other ways to improve the reliability of networking. Flexible configuration of a variety of optical ports, highly integrated, more flexible design for the construction of power grids
Carrier fiber ethernet Switch. Each area receives the voltage and current signals collected by the electronic transformer. After being converted into digital signals, the smart grid transmits the signals to the switch through optical fibers. The secondary devices obtain the data through the switch and process the data. Industrial switches play a huge role in data acquisition, production management, operation and maintenance, safety monitoring, metering and user interaction. Industrial Ethernet technology, optical fiber technology, information processing technology, such as the development and penetration of various fields, power system monitoring technology widely used in these advanced scientific research so that the online measurement technology gradually into the practical stage.


The difference between two switches and three switches

Layer 2 switches work in the data link layer and Layer 3 switches work in the network layer.
For a simple method, the three switches use three switching technology, that is, two-tier exchange technology + three-layer forwarding technology. After it resolves the segment of the LAN segment, the subnet of the segment must rely on the router to manage the situation, and solves the network bottleneck problem caused by the low speed and complexity of the traditional router.
The emergence of the three-tier exchange technology solves the problem of the network bottleneck caused by the low speed and complexity of the traditional routers after the network segments in the local area network are divided and the subnets in the network must rely on the routers for management.
The principle is: Suppose two IP protocol using the site A, B through the third layer switch to communicate, send site A at the beginning of the transmission, the IP address of their own and B station’s IP address to determine whether the station B and their own In the same subnet. If the destination station B and sending station A in the same subnet, then the two-story forwarding. If two sites are not in the same subnet, such as sending station A to communicate with destination B, sending station A sends an ARP (Address Resolution) packet to “default gateway”, and the IP address of “default gateway” is actually Layer 3 switch three switching module. When sending station A broadcasts an ARP request to the IP address of “default gateway”, sending layer A replies B’s MAC address to sending station A if Layer 3 switching module already knows the MAC address of station B in the previous communication process. Otherwise, the Layer 3 switching module broadcasts an ARP request to station B according to the routing information. After receiving the ARP request, station B replies its MAC address to the Layer 3 switching module. The Layer 3 switching module saves the address and sends back the reply to the sending station A, The station’s MAC address is sent to the Layer 2 switching engine’s MAC address table. From then on, when A to B to send the data packets will be all sent to the second floor exchange, the information can be exchanged at high speed. Since only three layers are needed during the routing process, the vast majority of data is forwarded through Layer 2 switching, so Layer 3 switches are fast, close to Layer 2 switches and much lower than the same router.

Network switch performance

Network switch
Network switch is a kind of network equipment to segment the network, from a technical point of view, the network switch belongs to the data link layer. Network switches from an electronic hub, which is a kind of central node equipment. So in a shared hub, all the star network connections are received in the same broadcast frame.
In general, switches are smarter than hubs. Why? Because the network switch intelligently monitors the original device and the device to which it receives the received packet, it ensures the correct forwarding process.
The flow monitoring process in the switch is more complicated because each port is in a separate state before data transmission, even when connected, only when the sending and receiving ports are connected. There are currently two main ways to support Network Manager monitoring network traffic in a switched environment:
Port Mirroring – The switch sends a set of network packets to the network monitoring connection.
SMON – “Switch Monitor” as defined in RFC 2613 is a protocol used to control facilities such as “port mirroring.”
There are other ways to support “Snooping” behavior on another computer in the network, such as pseudo-ARP MAC diffusion, without the need for a switch.

DCN Attend Sviaz 2017 in Russia

DCN showcased advanced solutions& products for mobile and IoT connectivity at Sviaz Expo in Moscow, April 25 – 28 2017.

Sviaz Expo, The largest trade show of IT and telecommunication solutions and products in Eastern Europo, More than three hundreds exhibitors from 17 countries, over sixteen thousands potential buyers in 4 days.

DCN displayed a number of solutions that will help partners provide a robust customer experience with minimal investments in the face of growing demand for on the go connectivity:

DCN Cloud WiFi Solution

DCN Operator FTTB Deployment

Dozens of DCN partners from all continents gathered at Svia to meet with DCN professional consultant.

DCN Presented in Global IPv6 & Next Generation Internet

IPv6 & Next Generation Internet Global Summit 2012 was held in Beijing on April 10th to 11th. In this anniversary summit, as the first Chinese manufacturer which acquires Enhanced IPv6 Ready Gold Certification, Digital China Networks Limited (Hereinafter DCN) has shared security solution in the IPv4/v6 interconnection environment as well as the achievements at Education field to the attendees from next generation of Internet field, government and enterprises.

Technical Director, Mr. Guo Xianfeng from DCN Industry Application Marketing Center,  shared Solutions of IPv6 campus network & core network, the foundation solution of cloud computing data center, IPv6 wireless campus network solution, IPv6 campus network outlet solutions, DHCPv6 solution, as well as the products of DCRS-9800 series data center switches, DCRS-6000 series data center switches.

In the next generation Internet core technology—- IPv6 field, DCN is the world’s pioneer IPv6 Ready manufacturer with all line products. DCN serves the largest group of users in the IPv6 commercial areas. In 2010, DCN was praised the IPv6 network and industry commercial award issued by the Global IPv6 Summit.

In the next generation of the internet, cloud computing, and IOT field, DCN owns the comprehensive advantage of the leading edge of IPv6 technology and wide range of products of wireless, application delivery, UTM, storage, server and switch, which can provide users with the infrastructure solution and application of cloud computing center. And DCN is going to actively explore and plan in order to keep the leading position in the market in the coming years.

FORTUNEChina 500: Digital China Remains in Top 100

July 16th, Fortune China released Top 500 corporations in China. Digital China Holdings Limited announced that it ranked 83th due to its overall competitive strengths. The Group has remained in top 100 of the list for 4 straight years.

Based on a comprehensive analysis for all Chinese enterprises listed both in China and overseas markets, Fortune China magazine picked corporates according to a wide range of parameters, including their asset size, profitability, growth potential, resources utilization and other financial indicators recorded for the calendar year ended December 2012. During the calendar year of 2012, the Group achieved total revenue of RMB 59.956 billion. It recorded revenue of HK$73.499 billion for the financial year ended 31 March 2013.

The inclusion of Digital China in top 100 of “Fortune China 500” for four straight years not only highlights the Group’s leading position in the IT industry, but also reflects the wide recognition of its significant contributions to China’s informatization through the Sm@rt City strategy.

Digital China is now China’s leading “Smart City expert” that boasts a forward-looking theoretical structure and has the largest stock of successful cases. It becomes an engine to drive China’s economic transformation.