I was using 15mbps ptcl connection but faced constant disconnection due to garbage line quality but did receive the advertised speed. My linesman told me to downgrade to 8mbps because the underground cable of exchange can’t handle high speeds because its garbage. Downgraded my connection to 8mbps, less disconnections now but still face minor to major disconnections. SNR margin still low but improved. It sucks i can’t even get stable connection on 8mbps. Minor disconnections are especially a pain in the ass, the internet disconnects for 3 seconds and then comes back on. Usually happens in peak hours. Don't have any other choice than ptcl.