how can we extend the rande of DSL upto 400 to
500 kilometers through switch,by using LAN?
500 kilometers ?????
Better get a good fiber or HF transmitter.I'd consider using a vpn to that destination though existing infrastructure.
Playing to the angels
Les Paul (1915-2009)
I think you need to read up on DSL and how it works. http://pcquest.ciol.com/content/bro...
DSL has a maximum range of a round 5 Kms and it effectiveness drops of very fast after that.
Most switches use Ethernet through copper cable and that has a maximum distance of 100 meters.
VPN or a dedicated fibre is your only option at that distance.
Stuart