I wonder if ECI's going to have it on downstream only for some reason, or whether it's something on the Fritz!Box 7490 that's controlling the upstream side of the G.INP and saying 'no' somehow? I know the FB 7490 has a habit of dynamically choosing whether bitswap's needed or not as when it's first synced it will say bitswap is off for both DS and US, and then may later on say it's on for either DS or US or even both.