Patent ID: 7242860
Filing Date: 2007-07-10
Classification: H04J

Abstract:
1. A network node having a fault protection switching device, said switching device comprising: first and second optical switch modules, each having a first and a second input port and a first and a second output port respectively connected in a first mode of operation and cross-connected in a second mode of operation; working optical fiber transmission lines respectively connected to the second input port and the second output port of the second optical switch module to be through connected in said first mode; protection optical fiber transmission lines connected to the second input port and the second output port of the first optical switch module to be through connected in said first mode; a first optical fiber line connected to the first output port of the first optical switch module and the first input port of the second optical switch module; a second optical fiber line connected to the first output port of the second optical switch module and the first input port of the first optical switch module to be through connected with the first optical fiber line in said first mode; and, wherein said first and second switch modules do not include a wavelength slicer.