Patent ID: 6246668
Filing Date: 2001-06-12
Classification: H04J,H04Q

Abstract:
A hitless path switching method for re-establishing synchronous traffic along a primary path from an alternate path, comprising the steps of:at an originating path terminal,generating a trace message, inserting said trace message in an information signal and transmitting said information signal along said primary path as a first information signal and along said alternate path as a second information signal;at a receiving path terminal,recovering a first variant of said trace message from said first information signal and recovering a second variant of said trace message from said second information signal, each said first and second variants being a respective delayed variant of said trace message;aligning said first and said second information signals based on the phase difference between said first and said second variants using linked pointer processors and generating a lock signal when alignment is completed; andat said originating path terminal,discontinuing transmission of said information signal along said alternate path upon generation of said lock signal.