Hitless switching system and transmission apparatus
AssigneeNippon Telegraph and Telephone Corporation
InventorsAtsushi Sutoh, Kazuhiro Oda
Life of this patent
Estimating the term…
Abstract
A hitless switching system includes a sending apparatus and a receiving apparatus. The sending apparatus includes: 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. The receiving apparatus includes: a phase difference detection part for detecting phase differences between signals sent from the sending apparatus; a phase difference absorbing part for absorbing phase differences detected by the phase difference detection part; selectors each of which selects one signal from a plurality of signals; and a restoring part for restoring the original signal from the signals output from the selectors.
Claims13
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 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 a plurality of signals in which phases are aliened;
- and
- a restoring part for restoring the original signal from signals output from said selectors.
A transmission apparatus for switching between signals transmitted over transmission lines, said transmission apparatus comprising:
- a receiving part for receiving virtual concatenation signals, wherein said virtual concatenation signals are obtained by dividing an original signal into virtual concatenation signals each of which is further branched to a plurality of virtual concatenation signals, or, by branching an original signal into a plurality of signals each of which are divided into a plurality of virtual concatenation signals;
- a phase difference detection part for detecting phase differences among virtual concatenation signals received by said receiving part;
- a phase difference absorbing part for absorbing phase differences detected by said phase difference detection part;
- selectors each of which selects a virtual concatenation signal from virtual concatenation signals in which phases are aligned;
- a restoring part for restoring said original signal from virtual concatenation signals each of which is output from one of said selectors.
Dependencies are inferred from the claim text.