As mentioned in another thread, the command for a HG612 is
xdslcmd info --vectoring:-
http://forum.kitz.co.uk/index.php/topic,14361.msg315735.html#msg315735# xdslcmd info --vectoring
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Last initialization procedure status: 0
Max: Upstream rate = 4847 Kbps, Downstream rate = 21648 Kbps
Bearer: 0, Upstream rate = 4789 Kbps, Downstream rate = 22059 Kbps
Bearer: 1, Upstream rate = 0 Kbps, Downstream rate = 0 Kbps
Vectoring state: 5VCE MAC Address: 0:0:0:0:0:0
Total error samples Ethernet pkts sent: 0
Total error samples Ethernet pkts discarded: 0
Total error samples statuses sent: 0
Total error samples statuses discarded: 0
#
i.e. not active yet.