BT Business Hub 6 A - working fine on our Huawei cabinet ( we can spit on it...), holds full synch 20/80, same as other modem/routers I have.
Noise margin: 11.6 dB / 7.1 dB. Fast Path.
BT Infinity 2, HG612, Billion 7800N; 79987/19999 Kbps. Online since 1987. Apples & Macs since 1979. Dreambox fun. Advanced Radio Amateur Licence and an anorak.