Patent ID: 7382723
Filing Date: 2008-06-03
Classification: H04J,H04L

Abstract:
1. A hitless switching system for switching between signals transmitted over a plurality of transmission lines, said hitless switching system comprising a sending apparatus and a receiving apparatus, said sending apparatus comprising: a distributing part for dividing an original signal into a plurality of signals; and a transmitting part for transmitting the divided signals over one or a plurality of transmission lines with redundancy, said receiving apparatus comprising: a phase difference detection part for detecting phase difference between the divided signals sent from said sending apparatus; a phase difference absorbing part for absorbing said phase difference detected by said phase difference detection part; selectors each of which selects one signal from the divided signals in which said phase difference is absorbed by said phase difference absorbing part; and a restoring part for restoring the original signal from signals output from said selectors, said distributing part comprising: a part for dividing said original signal into virtual concatenation signals as the divided signals by using virtual concatenation technology; and a part for inserting H4 byte multi-frame into each virtual concatenation signal, wherein said phase difference detection part detects said phase difference by using the H4 byte multi-frame, and said phase difference absorbing part absorbs said phase difference by using elastic store memories.