This issue can stem from various causes, including hardware malfunctions, configuration errors, or problems with your Internet Service Provider (ISP). We have a fibre run, SM, 650 meters, with Level1 dumb switches at each end, I get Link lights at both ends, but there's no network traffic. Switch B is on the remote end, 3. Fiber optic networks are celebrated for their speed and reliability, but even the best systems can encounter problems. This guide will walk you through diagnosing and resolving common. This article will list a few simple steps about how to do a check on the switch when the switch has no Internet access and try to solve the problem. Here we will list some common factors in this article. In this comprehensive guide, we'll explore the possible reasons behind this problem and provide step-by-step solutions to fix it. Right now, I can't get a lot of equipment to connect all with SFP-LH-SMD transceivers. This is a high-level summary of the situation, but it's really strange (and YES, I have. I've tried flushing the DNS, using default IP settings for the connection, restarting the router, modem, and PC, using the network reset button, using the network adapter troubleshooter, updating my drivers, switching ethernet cables, using a different ethernet port on the router, and connecting.