I live outside of Lausanne and I have an Internet-Box 3 router connected to Swisscom by G.fast technology. Our building has fiber optics (FTTC) and a Huawei MicroCAN box, installed in the basement, that delivers the fiber optics signal over the older copper wires that carried the older VDSL2. I am on an Internet L subscription in 500/100. For about 1 year now (just before the lockdown win March 2020), my router has been going down unexpectedly 2 or 3 times a day (the LED goes red and forces me to switch the box off and on). Three Swisscom technicians came to my home one after the other to troubleshoot the issue. The router was replaced with a new Internet-Box 3. My copper line network was analyzed, in the apartment and in the building. No errors were detected. A Swisscom technician wanted to swap temporarily, for troubleshooting purposes, my connection port on the MicroCAN of the building but the last available port of the G.fast MicroCAN cabinet is defective (!). They reduced the speed, implemented several profiles, changed the signal-to-noise ratio, 6/6, 9/9, 15/15, etc.. to no avail. Ultimately, a technician had managed to stabilize the line at a Signal to Noise Ratio of 6.3/6.4 for several months from May 2020 to the end of January 2021. I had no interruptions for several months and my router remained stable from May 2020 to the end of January 2021. Since February 4, 2021, it started to go down again: 2 or 3 interruptions per day (the router's LED turns red and I have to switch it off and on again or do a reset; to no avail). The interruptions always take place at a time when internet traffic is fairly active, e.g. 11:30, 14:00, 14:30, 17:00, 19:20, 21:00. No interruptions in the evening after 22:30 or in the morning. The problem is that the Swisscom technicians do not detect any errors on their side and my support case is stuck at level 2. They would need further data to be able to escalate to level 3 support. Apparently, my neighbors have no problems! However, since the MicroCAN G.fast cabinet, installed in the basement, has no port available, we cannot test on another port. If a Swisscom technician or a network savvy has any idea or suggestion, you are most welcome.
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