Tracing system for tracing transmission route in transmission network

Claim 1

A tracing system for tracing and displaying a transmission route between multiplexers in a transmission network in which a plurality of stations are connected by lines, each station accommodating one or a plurality of multiplexers, said tracing system comprising: a first database provided with information indicating states in which multiplexers in each station in said transmission network are connected to each other; a second database provided with information indicating attributes of transmission routes between stations connected to each other by a line; a third database provided with information indicating transmission routes accommodated in each of said stations; input means for inputting information regarding a multiplexer positioned at a tracing start point of tracing; route map processing means for tracing, based on the information provided in said second database, a transmission route from a starting station to a terminating station; MUX map processing means for tracing, based on the information provided in said first data base, a connecting path in which multiplexers are connected in said terminating station of the transmission route traced by said route map processing means; station map processing means for tracing a transmission route corresponding to a back-to-back connecting formation based on the information provided in said third database when the connecting path traced by said MUX map processing means includes the back-to-back connecting formation; changing means for changing the information indicating the tracing start point based on a position of a multiplexer connected to an end of the transmission route which corresponds to the back-to-back connecting formation and is traced by said station map processing means; tracing control means for switching between said route map processing means, said MUX map processing means, said station map processing means and said changing means so that the transmission route is traced from the multiplexer at the tracing start point identified by the information input by said input means to a multiplexer opposite to the multiplexer at the starting point; and display means for displaying the transmission route and the connecting path traced by said route map processing means, said MUX map processing means and said station map processing means all of which are switched by said tracing control means.