FSL-Fiber in the Subscriber Loop-I

All the telephone exchanges,local exchanges will be connected or interconnected through optical fiber .Thus it enables to enjoy enormous amount of  bandwidth to the suscriber.But there is a limitation.ie  from the exchange to the subscribers home we are connecting with ordinary copper cable,which will have limited bandwidth.If we use ADSL2+ technology we could achieve a bandwidth of  24 Mbps for a distance of 5 km.or less.But if we use VDSL techonology the bandwidth we can achieve is about 52 Mbps.but the distance is limited to 1 Km.So all the subscribers should reside within the 1 km radius,which is not possible.Also at each and every 1Km we should place exchanges,which is also not possible.So we will lay optical cable from the exchange to the subscribers home or a very near point.This is called Fiber in Subscriber Loop.FSL.