A magnetic scale includes a pipe and a polarizable magnetic member closely attached to the inner surface of the pipe so as to extend in the longitudinal direction of the pipe. Each node in the shared access network typically has an identifier or ID associated with it which is used at a Head End of the shared access network to uniquely identify that particular node from the other nodes in the network. The third electrode preferably includes a metallic and a polymer grid andor a conducting polymer. The LDAP client or server further select latest data, reconstruct the data into a single file having a tree data structure and saves the file.