Optical interface in SONET system
First Claim
1. An optical interface between a main line and a subscriber line in a SONET system, the optical interface comprising:
- a first transforming means for performing multiplexing/demultiplexing between higher level optical signals of a main line side thereof and lower level electrical signals of a subscriber side thereof, said lower level electrical signals inherently containing overhead signals, said means performing both first electrical/optical conversion between lower level electrical signals and higher level optical signals and second electrical/optical conversion between lower level electrical signals and relaying optical signals, said higher level optical signals containing said overhead signals from said lower level electrical signals;
an optical transmission line connected to said first transforming means, for receiving and transmitting said relaying optical signals which contain said overhead signals therein; and
a second transforming means connected to said first transforming means via said optical transmission line, for performing multiplexing/demultiplexing between said relaying optical signals containing said overhead signals received from said first transforming means and a plurality of subscriber side line digital electrical signals;
said second transforming means including means for performing insertion/extraction of said overhead signals.
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Abstract
An optical interface in a SONET system, wherein the optical interface includes a first multiplex/demultiplex apparatus for multiplexing/demultiplexing higher level signals of the main line side and lower level signals of the subscriber side and performing electrical/optical conversion of the lower level electrical signals and optical signals. An optical transmission line is provided for transmitting the optical signals. A second multiplex/demultiplex apparatus converts between the optical signals and a plurality of subscriber side line digital electrical signals. The overhead signals contained in the lower level signals and reaching the first multiplex/demultiplex apparatus are also contained in the optical signals and are transferred further from the first multiplex/demultiplex apparatus to the second multiplex/demultiplex apparatus.
19 Citations
8 Claims
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1. An optical interface between a main line and a subscriber line in a SONET system, the optical interface comprising:
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a first transforming means for performing multiplexing/demultiplexing between higher level optical signals of a main line side thereof and lower level electrical signals of a subscriber side thereof, said lower level electrical signals inherently containing overhead signals, said means performing both first electrical/optical conversion between lower level electrical signals and higher level optical signals and second electrical/optical conversion between lower level electrical signals and relaying optical signals, said higher level optical signals containing said overhead signals from said lower level electrical signals; an optical transmission line connected to said first transforming means, for receiving and transmitting said relaying optical signals which contain said overhead signals therein; and a second transforming means connected to said first transforming means via said optical transmission line, for performing multiplexing/demultiplexing between said relaying optical signals containing said overhead signals received from said first transforming means and a plurality of subscriber side line digital electrical signals; said second transforming means including means for performing insertion/extraction of said overhead signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification