@Joseph-TP 

Joseph-TP wrote

Hello @Beholster ,

Welcome to our community.

 

 

For the DSL Line Quality and CRC Errors:
1. Enable SRA (Seamless Rate Adaptation): Log in to your router's management page via tplinkmodem.net, go to Advanced > Network > DSL Settings, and enable SRA. This can help stabilize the connection.
2. Remove DSL splitters or filters: If you're using any DSL splitters or filters, remove them and connect the router directly to the front wall socket to reduce interference.
3. Replace the DSL cable: Try a different DSL cable to rule out cable damage, as faulty cables are a common cause of CRC errors.

For the Speed drops:
1. Log in to the web-based interface of your modem and check the Status page and DSL Status section.
2. Connect only one device to the modem via Ethernet cable and run three speed tests without any high-bandwidth activities (like downloads). Document the results.
3. Check your wired link speed. You can refer to this guide: How to check the associated/link speed on a wired client
4. Change your DNS to Google Public DNS (8.8.8.8 and 8.8.4.4) for better reliability. Guide: How to Change DNS Server Settings on a TP-Link Wireless Router or DSL Modem Router

For the Disconnection:
1. Power cycle: Restart your modem router completely.
2. Hard reset: If the issue persists, perform a factory reset by pressing the reset button for 7-10 seconds while the device is powered on, then reconfigure it.
3. Test with old modem: Since you mentioned you can't test with a new router, if you still have your old DSL modem, try connecting it to verify whether this is an ISP line issue or a router hardware issue.

Important Note: The extremely high CRC error count typically indicates physical line issues, damaged infrastructure, or problems at the exchange. It is recommended continuing to push your ISP to investigate the line quality, as they may need to send a technician to check the physical line.

 

I tried with SRA, there is no difference same absurd amount of CRC errors, low speed, horrible connection quality etc.
There isn't any splitter or filter I already unplugged everything 2 months ago.
I try different DSL Cable, no difference
Router start to create CRC errors as soon as it started, even if there isn't any connection or usage it still increases, also reconnecting after every restart takes at least 30 min everytime, something definetly wrong with this.

I did speed test as u said, all of them are %50 of the speed I should get or less, wi-fi/wired same with every device, mobile, laptop, or ethernet cable pc.
My wired link speed is 1.0 Gbps from windows so I'm not throttling at anything.

I tried other DNS's Cloudflare, Google, or default; same no difference.
I restarted more than 10 times for see if it ishit or miss but no everytime same
I didn't hard reseted yet and I don't have any spare or old modem, Atp I want to buy new one and try it

about Important note: I know that but In Turkey ISP's usually doesn't care us I try to deal with them for like 3 months as I said, they didn't even send any techinican group for checking area, I'm all alone in this matter if it's still continue after trying every single thing I'll make another extra and detailed Complaint.

Are there any other things I should try before buying a new router, they are little expensive for a student.
Thank you for help.
 

That level of CRC errors usually points to a line issue rather than the router itself bad cable, loose connection, or noise on the DSL line can tank download while upload looks okay. If you haven’t already, try a different DSL cable/port and check the SNR margin in your stats. Also, testing playback or buffering through something like inat box indir can help confirm if the instability is coming from the connection rather than the device.

  @Beholster 

Bad/loose cable (DSL/phone line or coax) → reseat or replace it Faulty splitter/filter → remove or swap it Wall jack issue → try a different socket Electrical interference → keep cables away from power lines/devices Line degradation outside your home → contact ISP if above doesn’t fix it

  @Beholster 
Thank you for help, I check all house infrastructure in weekend, Normally, when touching the splice points in the cables or bending the external cable, a change in the attenuation value could be observed, however, this time nothing changed at all, I changed DSL cable, but it's same so I'm almost sure it's nothing to do with my apartment's infrastructure only thing I didn't tried yet is Hard reset and Spare router, I will try these in weekend and after that I'll try my luck with my ISP, last time they replied me with "Your router has a strong malware u need to remove it" so I'm not very hopeful but thank u for your all help

Other than that I couldn't understand how to use "testing playback or buffering" programs, like how should I measure it.

If I can pinpoint the issue if it's related with router itself, it will be really helpful.


Edit: I also tried to hard reset modem entirely, still same.

High CRC errors and sudden speed drops usually point to physical line degradation, water damage in the street cabinet, or severe electromagnetic interference nearby. Since your router setup didn't change, Ome TV, the issue is almost certainly on your ISP's side or the copper wiring leading into your home. Try checking your telephone wall jack and splitter for corrosion or loose connections. Since your ISP is ignoring you, Vidizzy, look into your router's SNR margin settings; increasing it might stabilize the connection, even if it sacrifices a bit of speed.

Your router is experiencing severe line interference, likely caused by a damaged physical cable, a faulty splitter, or water damage in your building's junction box. Because your hardware and firmware haven't changed, Uhmegle, the issue is almost certainly external rather than a broken router. To fix this without spending money, check all your indoor telephone cables for tight bends, inspect the splitter, CooMeet, and try plugging the router directly into the main wall socket. Since your ISP ignored you, try filing an official complaint through Turkey's BTK Consumer Complaint system to force them to test your physical line.