Yes, interleaving/INP is set to use FEC (Forward Error Correction).
Those FEC's are errors that have been corrected, preventing ES.
experience DLM won't return the line to fastpath with excessive numbers of FEC.
There are particular brands of DECT phones that play well with FTTC and others that don't. It's not my area, I don't have a landline connected at all.
No idea if you are able to return the new DECT phone you bought but the line won't hold fastpath with it, if that's important to you.
Low Interleaving adds 8ms delay and knocks (very roughly) 10% off the sync compared to fastpath.
If you don't mind 8ms latency and a few Mb off the sync then interleaving can be a bit more stable with less packet loss.
What's your sync now, 53-54Mb?
Edited by j0hn83 (Sat 19-Jan-19 02:27:01)