Patent ID: 7711263
Filing Date: 2010-05-04
Classification: H04Q

Abstract:
1. An optical fiber network system, comprising: a host optical transmitting/receiving module; a splitter to split a downstream signal from the host optical transmitting/receiving module into two downstream signals; at least one client optical transmitting/receiving module; a primary optical channel carrying one of the downstream optical signals to transmit information from said host optical transmitting/receiving module to said at least one client optical transmitting/receiving module through a first route from a front terminal to a rear terminal of the primary optical channel; and a secondary optical channel carrying the other of the downstream optical signals to transmit information from said host optical transmitting/receiving module to said at least one client optical transmitting/receiving module through a second route from a front terminal to a rear terminal of the secondary optical channel if a broken-line fault is detected in the first route in said primary optical channel; wherein the transmission direction of said other downstream optical signal in the second route is counter to the first route; a broken-line fault protection module connected to the front terminal and second route to transmit said the rear terminal of said primary optical channel, the front terminal and the rear terminal of said secondary optical channel and said host optical transmitting/receiving module; wherein said broken-line fault protection module monitoring said one downstream optical signal at the rear terminal of said primary optical channel to detect the broken-line fault in said primary optical channel, activating the other downstream optical signal from the front terminal of said secondary optical channel and cutting off communication in said primary optical channel when the broken-line fault is detected in the first route in said primary optical channel; wherein said broken-line fault protection module also monitoring said other downstream optical signal at the rear terminal of said secondary optical channel to detect a broken-line fault in said secondary optical channel when said secondary optical channel is activated, reactivating the first route to transmit said one downstream optical signal again from the front terminal of said primary optical channel when the broken-line fault is detected in the second route in said secondary optical channel.