Cisco VDSL

Cisco 800 Series Integrated Services Routers Software Configuration Guide

https://www.cisco.com/c/en/us/td/docs/routers/access/800/software/configuration/guide/SCG800Guide.html#wp1163169

Cisco 887VA Configuration ( ADSL2+ )

https://www.ganomi.com/index.php/10-cisco-887va-configuration