US5109296A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmission line switching system
Assignee: Fujitsu Ltd
•
Filing: 1991-04-29
•
Granted: 1992-04-28
•
Expires: 2011-04-29
Abstract
Abstract A transmission line switching system for switching a transmission line in operation to another transmission line when a fault occurs in the transmission line during operation comprising: a transmission line in operation constituted by a plurality of terminal repeaters, a plurality of circuit switching apparatuses, and a plurality of transmission cables, all connected in series; and another transmission line provided between a head terminal repeater and an end terminal repeater; wherein when a transmission cable is completely disconnected, information input from the head terminal repeater is returned from a terminal repeater located just before a disconnection in the transmission cable to the head terminal repeater, transferred from the head terminal repeater to the end terminal repeater through the another transmission line, returned from the end terminal repeater to a terminal repeater located just after the disconnection in the transmission cable, and returned to the end terminal repeater.
Inventors
- 👤 Takeo Fukushima
- 👤 Kohichi Nishimura
- 👤 Masumi Kurokawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:26
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/74; H04B1/745
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
214 words
A transmission line switching system for switching a transmission line, connected between a head terminal repeater and an end terminal repeater, comprising: a transmission line connected between the head terminal repeater and the end terminal repeater, and including: a plurality of terminal repeaters, a plurality of circuit switching apparatuses, respectively operatively connected to corresponding ones of said terminal repeaters, and a plurality of transmission cables, respectively connected between a corresponding one of said circuit switching apparatuses and a corresponding one of said terminal repeaters; and another transmission line connected between the head terminal repeater and the end terminal repeater and in parallel with said transmission line; each of said circuit switching apparatuses include: detecting means for detecting if one of said plurality of transmission cables is completely disconnected; and means, responsive to said detecting means, for returning information input from the head terminal repeater to a terminal repeater located just before a disconnection in the transmission cable back to said head terminal repeater, for transferring the information from the had terminal repeater to the end terminal repeater through said another transmission line, for transferring the information from the end terminal repeater to a terminal repeater located just after said disconnection in the transmission cable, and for transferring the information to the end terminal repeater.
Claim 2
Dependent Claim
214 words
A transmission line switching system for switching a transmission line, connected between a head terminal repeater and an end terminal repeater, comprising: a transmission line connected between the head terminal repeater and the end terminal repeater, and including: a plurality of terminal repeaters, a plurality of circuit switching apparatuses, respectively operatively connected to corresponding ones of said terminal repeaters, and a plurality of transmission cables, respectively connected between a corresponding one of said circuit switching apparatuses and a corresponding one of said terminal repeaters; and another transmission line connected between the head terminal repeater and the end terminal repeater and in parallel with said transmission line; each of said circuit switching apparatuses include: detecting means for detecting if one of said plurality of transmission cables is completely disconnected; and means, responsive to said detecting means, for returning information input from the head terminal repeater to a terminal repeater located just before a disconnection in the transmission cable back to said head terminal repeater, for transferring the information from the had terminal repeater to the end terminal repeater through said another transmission line, for transferring the information from the end terminal repeater to a terminal repeater located just after said disconnection in the transmission cable, and for transferring the information to the end terminal repeater.
Claim 3
Dependent Claim
31 words
A transmission line switching system as claimed in claim 1, wherein each of said terminal repeaters include intermediate relay means for inserting to and deriving from an external circuit the information.
Claim 4
Dependent Claim
31 words
A transmission line switching system as claimed in claim 1, wherein each of said transmission cables includes a plurality of main cables and a spare cable bundled with said main cables.
Claim 5
Dependent Claim
21 words
A transmission line switching system as claimed in claim 1, wherein each of said transmission cables comprises an optical fiber cable.
Claim 6
Dependent Claim
20 words
A transmission line switching system as claimed in claim 1, wherein each of said transmission cables comprises a coaxial cable.
Claim 7
Dependent Claim
44 words
A transmission line switching system as claimed in claim 1, wherein each of said circuit switching apparatuses includes switching means for performing a loop back function to return the information to at least one of said head terminal repeater and said end terminal repeater.
Claim 8
Dependent Claim
26 words
A transmission line switching system as claimed in claim 1, wherein each of said circuit switching apparatuses is provided adjacent to each of said terminal repeaters.
Claim 9
Dependent Claim
34 words
A transmission line switching system as claimed in claim 1, wherein each of said circuit switching apparatuses comprises a plurality of optical switches, each respective connected to a corresponding one of said transmission cables.
References Cited (Backward Citations)
US3882456A
Cited
US3864533A
Cited
US3876983A
Cited
JPS56149851A
Cited
US4347607A
Cited
US4449247A
Cited
EP0144953A2
Cited
US4630268A
Cited
US4688260A
Cited
JPS62219720A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-04-28 | 1995-10-28 | 1996-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-28 | 1999-10-28 | 2000-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-28 | 2003-10-28 | 2004-04-28 | $7700.00 | Window Closed / Lapsed |