What is the Ethernet Switches
Ethernet switches, also known as industrial Ethernet switches, are used in the field of industrial control Ethernet switch equipment, due to the use of network standards open, widely used and inexpensive, using a transparent and unified TCP / IP Protocol, Ethernet has become the main communication standard in the field of industrial control.
There is no essential difference between the data link layer, the network layer and the protocol layer. However, for the real-time demand of industrial control, Industrial Ethernet solves the problems of real-time communication, Ethernet Switches network security, intrinsically safe and safe Explosion-proof technology and other technical problems, and the use of some suitable for industrial environments, such as waterproof, anti-vibration ... its core or commercial Ethernet is no essential difference, which is the difference between PC and IPC.
Unmanaged Switch (Unmanaged Switch)
The development of the hub produced a device called a non-managed switch. It can achieve the message from one port to another port routing function, the relative hub more intelligent. The unmanaged switch automatically detects the network speed of each network device. In addition, it has a function called "MAC address table", can identify and remember the network equipment. In other words, if port 2 receives a message with a specific identifier, the switch then sends all messages with that particular identifier to port 2. This intelligence avoids the message conflict, improves transmission performance, and the relative hub is a huge improvement. However, non-managed switches can not implement any form of communication detection and redundancy configuration.
Managed Switch (Managed Switch)
The next generation of Ethernet connectivity devices is a managed switch. Reliable and non-managed switches, managed switches have more and more complex features, and are much more expensive - typically 3 to 4 times that of a non-managed switch. Managed switches provide more functionality and can be fully configured through a web-based interface. It can automatically interact with the network equipment, users can also manually configure the speed of each port and flow control. Some older devices may not be able to use automatic interaction, Ethernet Switches so manual configuration is essential.
The vast majority of managed switches typically also provide advanced features such as SNMP (Simple Network Management Protocol) for remote monitoring and configuration, port mapping for diagnostics, VLANs for network devices (virtual local area networks), To ensure that the priority message through the priority arrangement function. Ethernet Switches With a managed switch, you can set up a redundant network. Using a ring topology, a managed switch can form a ring network. Each managed switch can automatically determine the optimal transmission path and alternate path, and automatically block the alternate path when the priority path is interrupted.