Ethernet devices in general (end-of-line devices and cabling devices) can be divided into two categories: unmanaged and managed devices. b Unmanaged devices are those devices for which there is no option to configure or control any of the device parameters. b Managed devices are those devices whose parameters can be configured or controlled (managed) and their internal data can be accessed. The ConneXium product line offers both types of device. There is also a third, unspecified category of device, which is normally classed as a managed device. However, there is one major difference: although this device allows access to its internal data, it cannot be controlled and/or configured. Managed devices Managed devices offer the following features: b Traffic optimization and filtering - The aim is to increase the bandwidth, or the traffic capacity in a network (some of the features in this area are message and port priority, flow control, multicast filtering, broadcast limiting, IGMP snooping, Vlan, etc.). b VLAN - A virtual LAN (VLAN) consists of a group of network participants in one or more network segments who can communicate with each other as if they belonged to the same LAN. VLANs are based on logical (instead of physical) links. The biggest advantage of VLANs is their possibility of forming user groups based on the participant function and not on their physical location or medium. Since broad/multicast data packets are transmitted exclusively within a virtual LAN, the remaining data network is unaffected. VLAN can also serve as a security mechanism to block unwanted Unicast messages. b Security - This feature helps the user protect the switch from unauthorized access that could result in changes in its configuration and impact the traffic going through the switch (some of the features in this area are port security, read/write community name, etc.). Users can also set up the switch so that it blocks messages coming from unauthorized device source addresses connected to the switch. b Time synchronization - This feature allows all devices in a network to be synchronized according to the time. b Network redundancy - This helps to develop high availability applications. b Dual ring switch (DRS) - These switches are provided with predefined settings to optimize communication performance and help save time in Ethernet RIO architectures with Modicon Quantum and Modicon M580 automation platforms. DRS switches are mandatory to build Ethernet RIO architectures in which sub-rings have to be connected to the main Ethernet ring.
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