unexpected failure in the CRC on the DSL connection led to the loss of the DSL link together with unusual PL behavior.
unexpected failure in the CRC on the DSL connection led to the loss of the DSL link together with unusual PL behavior.
I'm tired of the slow internet and all the problems you're facing. I reached out to my ISP, who told me the DSL connection issue isn't their responsibility. I should have contacted local support to verify my line. When someone came by, they checked the line and it looked good, but they suggested trying the phone call again. Still, I'm dealing with frustrating packet loss in online games. They also checked my gateway and confirmed everything was fine there.
If you're not familiar with your country's ISP, you might need to wait until a dedicated gateway for that provider becomes available. I don't have much insight into network settings, but here are some details from my modem/router (ASUS DSL-N14U) and a trace route log:
- SNR margin reached 35 dB (image shows 18 dB), dropping to zero when the line goes down.
- Line attenuation stays strong and stable.
- I'm using G.dmt modulation, which helps reduce delays compared to ADSL2+.
- As long as my maximum speed is well below what's possible, I should be okay.
- The log mentions a few notes:
1. Recent connection loss log (maybe useful later).
2. Routing table information.
3. DSL performance details (SNR margin, attenuation).
4. CRC values showing 0 sometimes but connection drops when CRC triggers.
5. Traceroute to Google DNS showed high latency initially, then improved.
6. Ping tests to Google DNS revealed consistent packet loss.
7. A ping plotter now displays packet loss between my device and router.
I'm not sure what the power settings mean in this log, but it seems like something is going on behind the scenes. Let me know if you can help figure out where the issue lies.
CRCs indicate physical line problems. The best solution is to fix the line or identify what’s causing the sudden increase under load. A SNR between 35-18 means a clean connection. When CRC spikes and SNR drops below 6dB (stable threshold), it suggests one of these issues: 1. Strong power device inside the house near the DSL line – verify if power cables run parallel 2. AM radio frequency interference – includes nearby AM towers, ham radios, or handheld walkie talkies – check for recent installations 3. Poor termination at drop points or inside the house, especially in colder northern climates where metal contraction can pull the line away from a direct connection, weakening the link and raising CRCs 4. A faulty pair causing CRCs during load; this often follows a pattern in time or device type. DSL uses reserved channels, so CRCs aren’t visible until an event occurs. If you suspect bad termination, try it now and look for patterns (time, device). DSL isn’t always straightforward – it involves a lot of educated guessing. You mentioned no latency, your router averages 1.0, but the issue appears at your gateway. Be cautious with low-bandwidth connections; they can saturate easily from browsing and trigger spikes, which is just a side effect of a slow connection.
It doesn't match what you expected. Your setup included a long distance with significant aluminum and ADSL2+ remained much faster than ADSL1. The main benefit was reduced latency thanks to higher upstream bandwidth. After the issue is resolved, I anticipate your connection will work significantly better for 2+ versus 1.
I’ll explain the situation in a different way. The issue involves several cables and connections close to my home and shop. It looks like a bundle of wires resembles a rope, but the connectors appear okay. After that bundle, there’s a fan or something similar with metal framing around the shop’s upper area. Then it moves past the modem and goes inside the building through a roof opening down to the ground floor. In winter it stays wet, yet it doesn’t seem to interfere with the lines. Nearby, there are two RJ45 ports and a 12V DC cable leading all the way to my modem. I’m unsure what you mean by a high-powered device. I’ve heard that DC power affects DSL but not AC, and there’s an outdoor electricity column close to my house, though it’s only a few meters away from the local box. During power outages, the lines still work, so they shouldn’t be causing problems.
I’m wondering if replacing or removing the cables would help, or if I should just wait for service. Since I can’t fix it myself and expect it to take days or months, I want to know why latency remains high—especially since my ping tests show around 50% packet loss. If latency drops after that, it’s definitely not due to bandwidth limits. The spikes seem unrelated to low speed. I suspect the issue lies with the connection path itself, possibly affecting stability.