I think it's Huawei. Here's a picture.
Looks like mine.
I mentioned the brand mis-match before but there's conflicting info on whether or not that's an issue.
I think with the latest firmware in the modems its not supposed to matter. The Huawei modems are easy to hack and physically smaller than the ECI.
My parents were given an ECI modem, and I got them a Huawei from eBay and unlocked it, so I could see the stats. Their connection is about 3 weeks old and distance wise the same as mine (in metres) but they get the full 80/20 sync.
James BT Infinity 2 19/09/2012 - Sold 42/6 - Getting 49/8.5 - Sync 53 / 9.5 Mbps @ 470m approx
14 years of broadband (ntl: cable to BT FTTC) - Router: Asus RT-N66U - Modem: Huawei HG612 speedtest