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Shenzhen JHA Technology Co., Ltd is one of the leading manufacturers of hardened Ethernet, PoE, and fiber connectivity products specifically designed for harsh and demanding environments.
08
2022
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06
The key to industrial switch selection
A key question when choosing an Industrial Ethernet switch is whether to choose a managed switch or an unmanaged switch. While a managed switch is usually more expensive, it offers some extra powerful features. Managed switches also include the features of unmanaged switches.
Managed switches generally support Simple Network Management Protocol (SNMP). Of course, most managed switches have more than this (SNMP) feature. Basically, managed switches give you control over the network, whereas unmanaged switches usually only allow Ethernet devices to communicate. Managed switches also allow you to monitor the network. Through SNMP, you can view various network status, including the number of bytes received/transmitted, the number of frames received/transmitted, the number of errors and port status, etc., all of which can be viewed port by port.
Managed switches also have advanced features that improve system network control. Features like Quality of Service (QoS), Virtual Local Area Network (VLAN), Port Mirroring, IGMP Snooping, Redundancy, and SNMP are usually only available on managed switches. Most managed switches have advanced features such as:
1. QoS is the ability of a switch to apply high priority to specific data frames.
2. VLANs allow switches to logically group devices, and even if all devices share a single physical switch, traffic between these device groups can be isolated.
3. Port mirroring allows one port of the switch to monitor the traffic sent or received by one or more ports of the switch. This feature facilitates real-time monitoring of communication data, and is a common fault finding method for Ethernet.
4. IGMP Snooping can automatically send multicast frames only to those devices that request these frames, which can prevent multicast frames from being sent to those devices that do not request these frames.
5.SNMP is a simple network management protocol, which allows network management applications to communicate with switches in a standard way, request status information and set configurations. Some vendors also offer network management programs that convert SNMP data into OPC data used in the system.
6. Ring redundancy is a common feature of managed industrial Ethernet switches. Many industrial Ethernet switch manufacturers have created their own dedicated ring redundancy protocols. Such as GAONET's SW-Ring ring network redundancy technology (network failure self-healing time <20ms)
In addition to this, in terms of transmission medium, most industrial Ethernet communication is carried out over twisted pair, but sometimes fiber optic cables are required. When the signal transmission distance exceeds 100 meters supported by the twisted pair, an optical cable is required. The communication distance of multi-mode fiber can reach 2 kilometers; the communication distance of single-mode fiber can reach 15 kilometers. Fiber optic cables are also generally used in high-noise environments because their communications are not susceptible to electrical or magnetic fields.
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