We have a fibre optic ring around a construction site. Probably about 10km of cable and linked up to 10 switches as it goes. A simple design, just using fibre as the uplink and downlink to each switch around the site, creating a perfect ring theoretically.
However, when/if switch 9 is deactivated, switch 8 also drops from the network, even though it should be supported from the other side by switch 7. The switch (8) itself is still powered up in this instance and providing PoE to the connected devices, it just cannot transmit the data through the link. I have used a tester on this cable (admittedly a cheap one) and it seems to be OK. Unfortunately we cannot run a new cable between 7 and 8 because the ducting is terrible. Other than switch 1, the others are in outdoor environments (protected in IP68 cabinets) so there is only space for a patch panel, a switch and a UPS, with none of the luxuries we can rely on indoors.
Can anyone shed some light on this? It's quite a big issue for us. I have UPSs in place but now and again the battery will completely drain before the electricians can restore power, creating the problem I mention.
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