Among industrial communication products, industrial Ethernet switches and industrial EPON are two common products, and they are the two most important distribution network communication solutions. A simple comparison of the two schemes is made in terms of protocol, degree of industrialization, networking mode, and maintainability.
　　 1. Protocol standardization
The switch has matured and commercialized for many years, and the standardization of its protocol has been completed, including the underlying protocol, network redundancy protocol, management protocol, network accurate clock transmission protocol, etc. The interoperability of different vendors' products is good, and hybrid networking can be realized.
The standard of EPON was officially released in 2004, and the standard of industrial EPON was gradually improved in recent years. Therefore, the standardization of many specific implementation details should be unified, such as dynamic bandwidth DBA algorithm, ranging implementation method, encryption algorithm, etc. In terms of status, interoperability still has certain risks and takes a while.
　　 2. Degree of industrialization
The concept of industrial Ethernet has been proposed since 2000. After more than ten years of rapid development, the entire industry chain is very mature, both in the chip and in the market. The industrial characteristics of EMC, high and low temperature can fully meet the industrial needs, outside the distribution network. The market has been widely used.
As a relatively new technology, EPON has a short industrialization time and is mainly concentrated in the power industry. The actual operating experience is insufficient. The optical splitter is a passive device with high stability. However, OLT and ONU are all active devices, and industrialization is mostly inferior to industrial Ethernet devices.
　　 3, networking mode
EPON can form a point-to-multipoint network mode through the optical splitter, which is very suitable for the actual distribution of the distribution network. Each ONU is connected in parallel mode and has strong resistance to multiple points. The possible disadvantage is that all business processing is concentrated on the OLT. The stability of the OLT is crucial. After the OLT takes effect, the whole network will be disconnected, and the communication between the underlying nodes will be interrupted. Due to the insertion loss of the optical splitter, the network cannot be too large, and the maximum length cannot exceed 20 kilometers. For the expansion of new nodes, it is very convenient to increase the direction by replacing the optical splitter.
Industrial Ethernet switches mainly use segment redundancy, intersecting rings, and tangent rings to improve the reliability of the networking and weak resistance to multiple points. Its peer-to-peer communication mode, a single node failure will not have a fatal impact on the entire network. By selecting the appropriate optical module, the transmission distance can be up to 100 kilometers. For capacity expansion, you need to replace the switch of the connected node to support more and more optical ports, and the cost will increase.
For the single-fiber bidirectional advantage of EPON, first of all, only one fiber is currently being wired, and Industrial Ethernet can also support single-fiber transmission through a single-fiber optical port.
　　 1. Protocol standardization
The switch has matured and commercialized for many years, and the standardization of its protocol has been completed, including the underlying protocol, network redundancy protocol, management protocol, network accurate clock transmission protocol, etc. The interoperability of different vendors' products is good, and hybrid networking can be realized.
The standard of EPON was officially released in 2004, and the standard of industrial EPON was gradually improved in recent years. Therefore, the standardization of many specific implementation details should be unified, such as dynamic bandwidth DBA algorithm, ranging implementation method, encryption algorithm, etc. In terms of status, interoperability still has certain risks and takes a while.
　　 2. Degree of industrialization
The concept of industrial Ethernet has been proposed since 2000. After more than ten years of rapid development, the entire industry chain is very mature, both in the chip and in the market. The industrial characteristics of EMC, high and low temperature can fully meet the industrial needs, outside the distribution network. The market has been widely used.
As a relatively new technology, EPON has a short industrialization time and is mainly concentrated in the power industry. The actual operating experience is insufficient. The optical splitter is a passive device with high stability. However, OLT and ONU are all active devices, and industrialization is mostly inferior to industrial Ethernet devices.
　　 3, networking mode
EPON can form a point-to-multipoint network mode through the optical splitter, which is very suitable for the actual distribution of the distribution network. Each ONU is connected in parallel mode and has strong resistance to multiple points. The possible disadvantage is that all business processing is concentrated on the OLT. The stability of the OLT is crucial. After the OLT takes effect, the whole network will be disconnected, and the communication between the underlying nodes will be interrupted. Due to the insertion loss of the optical splitter, the network cannot be too large, and the maximum length cannot exceed 20 kilometers. For the expansion of new nodes, it is very convenient to increase the direction by replacing the optical splitter.
Industrial Ethernet switches mainly use segment redundancy, intersecting rings, and tangent rings to improve the reliability of the networking and weak resistance to multiple points. Its peer-to-peer communication mode, a single node failure will not have a fatal impact on the entire network. By selecting the appropriate optical module, the transmission distance can be up to 100 kilometers. For capacity expansion, you need to replace the switch of the connected node to support more and more optical ports, and the cost will increase.
For the single-fiber bidirectional advantage of EPON, first of all, only one fiber is currently being wired, and Industrial Ethernet can also support single-fiber transmission through a single-fiber optical port.
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