This paper starts with the background and causes for the reconstruction of the SDH access loop
and then thoroughly approaches the general process
time distribution
customer coverage
and principles for the annual routine reconstruction of the SDH access loop.Moreover
it emphasizes that attention must paid to the key step cutover in the reconstruction.This paper is a guide to preventing adverse effect of the access loop in the networking and cutover to the customers
saving investment
guaranteeing smooth network upgrade and network security
and improving network capacity and network bandwidth usage.