Optical bypass protection industrial switches in highway applications

I. What is a bypass (optical bypass protection)?

Industrial Ethernet switch A serial network device is a device located in the main network link, through which all network traffic will pass. This threatens the normal operation and stability of the network. The Bypass industrial Ethernet switch automatically bypasses the device in the event of a device failure or power failure to eliminate the single point of failure.

The Bypass industrial Ethernet switch has the following features and benefits.
l Plug-and-play installation; no software development required
Remote control capability and web management
Keeps network traffic flowing when embedded devices fail
Removal of embedded devices for maintenance without affecting network traffic
Ensures high reliability and maximum network uptime

II. Working principle of Bypass industrial Ethernet switch
During normal operation of the industrial switch, the data of port1 and port2 are exchanged and processed through the switch; after the switch is powered off, the optical switch of the switch is activated and the data of port1 and port2 are transmitted directly through the optical switch.



Main circuit: 1-->3-->Native switching unit-->4-->2
Bypass Bypass: 1-->5-->2

The bypass switch automatically switches from the main path to the bypass state when there is no light in the local equipment or when the received optical power is below the threshold value set for switching. two network ports in the bypass switch can create a completely passive serial connection and maintain traffic even without power. For fibre-optic links, a normally closed optical switch creates a path for light to pass unimpeded through the device in the event of a power failure.


In a tandem network, the failure of any one node in the network can affect the function of the entire network. In network environments such as highways, where tandem networks are often established with long distances and multiple nodes on a single line, Bypass industrial Ethernet switches play an extremely important role in the network. This is where the Bypass industrial Ethernet switch plays an extremely important role in the network.


V. Differences between bypass industrial Ethernet switches and normal ring switches
For example, in the HT3208GRI-2SFPG ring switch, network transmission can be restored through a backup link after a single node failure, but there is no recovery function after two or more nodes fail. The HT3208GRI-2SFPG-OBP bypass switch makes up for this shortcoming.


The HT3208GRI-2SFPG-OBP bypass switch makes up for this. In the network structure shown in the diagram, using a normal ring switch HT3208GRI-2SFPG-BP, if node 2 and node 5 fail at the same time, the equipment and data of the intermediate nodes will not be transmitted normally. In the same environment, if a bypass switch HT3208GI-2SFPG-OBP is used, a power failure at two or more nodes in the link will not affect the network transmission of the other nodes.


VI. bypass industrial switch application solutions