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US4558358A
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Cable network monitoring system for CATV system
Assignee: Pioneer Corp
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Filing: 1982-05-27
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Granted: 1985-12-10
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Expires: 2002-05-27
Abstract
Abstract A CATV system includes terminal units with which two-way data communication with a central terminal is possible. A cable network monitoring system is capable of assisting in the location of faults by sending data such as the received signal strength at various points of the network back to the central station for analysis.
Inventors
- 👤 Kazuyoshi Onda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:20
CPC Classifications
H; H04; H04H; H04H20/00; H04H20/12; H04N; H04N7/00; H04N7/16; H04N7/173
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
139 words
A cable network monitoring system for a bi-directionally communicating CATV system, comprising; a center, a plurality of terminal units connected to said center through cables, and a plurality of monitor terminals disposed at certain locations in a cable network of said CATV system, each of said plurality of monitor terminals comprising: (a) means for receiving a polling signal specific thereto and including an address code and a downstream data signal sent from said center, (b) means for detecting a signal level of said polling signal transmitted from said center, and (c) means for transmitting an upstream signal responsive to said downstream data signal portion of said polling signal, said upstream signal including a signal indicative of the detected signal level of said same polling signal, whereby the cable network may be monitored at said center from said upstream signal.
Claim 2
Dependent Claim
139 words
A cable network monitoring system for a bi-directionally communicating CATV system, comprising; a center, a plurality of terminal units connected to said center through cables, and a plurality of monitor terminals disposed at certain locations in a cable network of said CATV system, each of said plurality of monitor terminals comprising: (a) means for receiving a polling signal specific thereto and including an address code and a downstream data signal sent from said center, (b) means for detecting a signal level of said polling signal transmitted from said center, and (c) means for transmitting an upstream signal responsive to said downstream data signal portion of said polling signal, said upstream signal including a signal indicative of the detected signal level of said same polling signal, whereby the cable network may be monitored at said center from said upstream signal.
Claim 3
Dependent Claim
16 words
A device as claimed in claim 1, said upstream signal containing at least said address code.
Claim 4
Dependent Claim
23 words
A device as claimed in claim 1, said monitors further comprising means for detecting a level of a signal transmitted by said monitor.
Claim 5
Dependent Claim
33 words
A device as claimed in claim 3, a signal indicative of the level of a signal transmitted by said monitor being transmitted by said monitor as a further part of said upstream signal.
References Cited (Backward Citations)
US4408345A
Cited
US4365249A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-09 | 1989-06-10 | 1989-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-09 | 1993-06-10 | 1993-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-09 | 1997-06-10 | 1997-12-10 | $7700.00 | Window Closed / Lapsed |