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United States Patent | 5,121,244 |
Takasaki | June 9, 1992 |
An optical subscriber network transmission system comprises a first optical transmission line transmitting information from center to a subscriber and a second optical transmission line transmitting information from to the subscriber to the center. A plurality of auxiliary optical transmission lines are disposed between the center and the subscriber.
Inventors: | Takasaki; Yoshitaka (Tokorozawa, JP) |
Assignee: |
Hitachi, Ltd.
(Tokyo,
JP)
|
Appl. No.: | 07/323,711 |
Filed: | March 15, 1989 |
Mar 18, 1988 [JP] | 63-63245 | |||
Current U.S. Class: | 398/14 ; 398/20; 398/5; 398/7; 398/72 |
Current International Class: | H04B 10/00 (20060101); H04B 010/12 () |
Field of Search: | 455/600,606,607,605,612,617,618,619 370/1,3,4,16.1,16 359/125,161,179 |
4658394 | April 1987 | Cheng et al. |
4704713 | November 1987 | Haller et al. |
0004340 | Jan., 1986 | JP | |||
0123537 | May., 1989 | JP | |||
2121637 | Dec., 1983 | GB | |||
2198903 | Jun., 1988 | GB | |||
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