After obtaining a suitable VDSL router, and ensuring that the DSL filter is into the master socket*, the following settings should provide optimal performance on most routers:

DSL modulation
VDSL2 (ITU G.993.2) | Auto
ANNEX mode
A/I/J/L/M
VDSL profile
17a | 30a multi-mode
Rx AGC GAIN AdjustmentEnabled | Auto | Stable
Dynamic Line Adjustment (DLA)
Enabled | Auto
UPBO - Upstream Power Back OffAuto | Enabled
ESNP - Enhanced Sudden Noise Protection
Stable | Auto | Enabled
SRA (Seamless Rate Adaptation)Enabled | Auto
Bitswap
Enabled | Auto
G.INP (G.998.4)
Enabled | Auto (INP - Impluse Noise Protection - attempts to correct sudden bursts of noise)
G.vector (G.993.5)Enabled | Auto (G.993.5 uses self-FEXT - far-end crosstalk- cancellation)
Non-standard G.vector (G.993.5)Enabled | Auto
WAN transfer mode
VDSL (PTM)
WAN connection type (protocol)
PPPoE
802.1Q
Enabled
VLAN ID
101
802.1P 0 (Older DLSAMs do may not understand 802.1P, however
some newer Juniper DSLAMs will understand 802.1P, and allow a value of 2)
PPP authentication
Auto
PPP username & password
(Use broadband username+password provided)
IP address & gateway:
DHCP (auto-assigned; do not enter a static IP - they are consistently assigned using DHCP)
DNS servers:
208.67.220.220 & 208.67.222.222 (Cisco, formerly OpenDNS)
NAT
Enabled 
MTU
1492
IPv6
(Not yet implemented)

 

* DSL filter: do not plug the filter into a PSTN telephone extension. If the local network of computers is too far from the phone socket you should leave the DSL router connected direct to the phone socket and use Ethernet (LAN) cable FROM THE ROUTER, back to a switch near the local network computers. Ethernet cable will work up to 100m without performance loss, but VDSL signal degrades on PSTN cable after just 2m. PSTN telephone extension cables are not even "twisted pair" so they an extension cable will pick up interference from power supplies, lighting, and even the DSL router itself!