My modem resynchronised this morning and G.INP is now active in both directions. I've not seen upstream G.INP for a very long time; I assumed it was disabled because of compatibility issues with certain modems. Has there been a change? I've been running the same modem since G.INP was first rolled-out.
I'm pretty happy since it added around 1Mbps to my upstream:
Max. DSLAM throughput kbit/s 80000 20000
Attainable throughput kbit/s 42530 7692
Current throughput kbit/s 42530 7692
Latency fast fast
Impulse Noise Protection (INP) 44 48
G.INP on on