Hi,
I just connected a friends MT992 modem which is supplied with a G.Fast installation by some ISP's.
I wondered if it would sync with my standard (non G.Fast) VDSL2 line. It does.
It syncs about 4Mb lower than my Zyxel 8924 (76Mb instead of 80Mb).
However the good news is that it supports MTU 1500 (like the old and now retired BT HG612 did).
me@puter:~$ ping -c4 -M do -s 1472 1.1.1.1
PING 1.1.1.1 (1.1.1.1) 1472(1500) bytes of data.
1480 bytes from 1.1.1.1: icmp_seq=1 ttl=60 time=18.3 ms
1480 bytes from 1.1.1.1: icmp_seq=2 ttl=60 time=18.3 ms
1480 bytes from 1.1.1.1: icmp_seq=3 ttl=60 time=18.3 ms
1480 bytes from 1.1.1.1: icmp_seq=4 ttl=60 time=18.2 ms
--- 1.1.1.1 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3004ms
rtt min/avg/max/mdev = 18.161/18.278/18.337/0.069 ms