Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1994-07-27
1996-02-20
Boudreau, Leo H.
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359177, 370 16, H04B 1008
Patent
active
054934320
ABSTRACT:
An optical communication system includes first and second optical terminal apparatuses, first and second optical repeating installations, a working transmission line coupling the first and second optical terminal apparatuses via the first optical repeating installation, and a protection transmission line coupling the first and second optical terminal apparatuses via the second optical repeating installation. Each of the first and second optical terminal apparatuses and the first and second optical repeating installations include a mechanism for transmitting an overhead signal including an identifier to the working transmission line and the protection transmission line by multiplexing the overhead signal with main signals when operating as a transmitting apparatus or installation, where the identifier identifies an apparatus or installation to be supervised, a mechanism for transferring the overhead signal as it is when not identified by the identifier, a mechanism for returning a response signal to one of the working transmission line and the protection transmission line from which the overhead signal is received when identified by the identifier, and a mechanism for cutting the apparatus or installation from one of the working transmission line and the protection transmission line so as not to transfer the overhead signal thereto, and passing through the overhead signal in other apparatuses and/or installations.
REFERENCES:
patent: 4451916 (1984-05-01), Casper et al.
patent: 5069521 (1991-12-01), Hardwick
Boudreau Leo H.
Fujitsu Limited
Negash Kinfe-Michael
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