I don’t understand the pilot tone in DSL; Is it meant for detecting the presence of the service ?
I read in a Huawei document that the downstream pilot tone is supposed to be tone 64 and there’s supposed to be an upstream tone at tone 16. I am seeing a drop down to bit loading=2 on tone 69, not tone 64, and I’m not seeing any bit loading drop on tone 16 so I don’t understand where that has disappeared to.