Mesh network switching Uplink without data loss
Mesh network switching Uplink without data loss
Hello Everybody
As manufacturer of cable cars and the automation we often use wifi to get network access in the (moving) gondola
now we have the first cable car with no sight connection from one station to the other, so the chart must switch its AP on the flight. since safety protocols are transmitted over this network the connection might not be lost for longer than 199ms.
we did some tests with the UniFi AC and TP-Link Omada Mesh without luck, the switchover is not done before it looses the connection to one AP completely (even the ping gets higher than 199 ms causing the PLC to issue a emergency stop)
other tests using 2 independent WLANs with the RSTP feature on the managed network switch failed too since it takes up to 600ms to switch over (here as well the switch over is not done before it looses the connection completely)
are there maybe some 802.1k wifi - ethernet bridges available on the market?
ofcourse there are some very expensive solutions in industrial Ethernet, but spending about 2000$ just for a simple wifi device with less than 100mbit makes not much sense for us.
any advice would be highly appreciated
Kevin
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R1D2 wrote
The Moxa device uses DFS channels. What if high-priority users (commercial live broadcasting, satellite links, weather radars, military radars) force your AP to change channels and re-negotiate with clients? There will be a short break. What if the whole 5 GHz band gets jammed by military for days as it was done at this year's WEF meeting in Davos, Suisse, forcing nearby Pharos CPE backhauls to stop working at all in an area of 60+ km around the event location? Did you consider this?
if the EAPs have to re-negotiate with clients, there is a big chance that this will happen while the cablecar is not moving, if it happens during movement, it will issue a E-Stop.
This risk is always taken when working with radio connection. there is no garantee that it will never be disturbed.
R1D2 wrote
Keep in mind that Omada mesh uses a proprietary protocol, it's not an 802.11s based mesh network (just in case you want wirelessly mesh the Moxa with EAPs – that won't work). You can use STA-to-AP links, though, if the mesh is just for the backhaul between EAPs, but the mesh links are affected by DFS/TPC, too.
The mesh is just used for the EAPs. The connection to the moving gondola will then be a standard 802.11 wifi connection (like it would be with any other client)
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