Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1993-01-28
1994-11-22
Chilcot, Jr., Richard E.
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359113, 359128, 359152, 359166, 371 205, 370 15, H04B 1008
Patent
active
053673956
ABSTRACT:
In a first apparatus, transmission signals are inverted in a sending side and are restored in a receiving side in one direction of two-way communication, and transmission signals are not inverted in another direction, to thereby distinguish a signal reflected at a fault point of an optical fiber from normal receiving signals from the station of the other party. In a loopback test, an inverter provided in the receiving side of the former direction is bypassed and an inverter is inserted in the receiving side of the latter direction. In a second apparatus, overhead information for identifying stations is added in a sending side. In a receiving side, the overhead is extracted. The extracted overhead is compared with an identifier of the station of the other party in a normal operation and is compared with an identifier of the station itself in a loopback test.
REFERENCES:
patent: 4883668 (1989-05-01), Rowley et al.
patent: 4887309 (1989-12-01), Andersson et al.
patent: 5010544 (1991-04-01), Chang et al.
patent: 5043976 (1991-08-01), Abiven et al.
Komuro Yasuko
Yajima Noboru
Yoshida Hiroshi
Chilcot Jr. Richard E.
Fujitsu Limited
Negash Kinfe-Michael
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