Patent US4245342A successfully refreshed from Google Patents.
US4245342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
One-for-n modem control apparatus
Assignee: INTECH LABS Inc
•
Filing: 1979-01-10
•
Granted: 1981-01-13
•
Expires: 1999-01-10
Abstract
Abstract Communications apparatus includes one-for-n modem redundancy for a plurality of typically contiguously disposed modem modules. The modem modules comprise n active units each illustratively operating in a different frequency band and a redundant (spare) modem of electronically adjustable frequency. The on-line (active) modem modules each include a multiplexer which normally connects user terminal equipment associated with the module to the frequency translating and data and control signal processing circuitry in the module. When a fault is detected in one of the modems (sensed, for example, by negated module "data valid" or "clear to send" levels for receive and transmit modems, respectively), a hierarchal control network and related apparatus automatically sets the redundant modem to the proper operating frequency and substitutes the spare for the failed unit via the appropriate multiplexer. In an alternative, microprocessor controlled embodiment of the present invention, the dedicated priority of the hierarchal control network may be replaced by any desired algorithm for alloting the redundant modem among the n on-line unit.
Inventors
- 👤 Alan W. Entenman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:20
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/22
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
235 words
In combination, plural on-line modem modules each including heterodyning and signalling modem means and controlled multiplexing means for connecting a first port thereof with one of second and third ports, said second port being connected to said modem means, a redundant modem module having heterodyning and signalling modem means connected to said third ports of said multiplexers in said on-line modem modules, said heterdyning means in said redundant module being frequency adjustable in accordance with a frequency control signal, priority assignment control means connected to said modem means and said multiplexers of said on-line modem modules for normally controlling said multiplexers to connect said first and second ports and responsive to sensing a failure of said modem means for connecting said first and third ports of said multiplexer of a failed one of said modem means, said control means including priority assignment means for connecting said first and third ports of only one of said multiplexers in accordance with a predetermined modem hierarchy, and frequency implementing means responsive to said control means connecting said first and third ports of a failed modem means for supplying said frequency control signal to said heterodyne modem means in said redundant modem module to substantially duplicate the operational frequency of said failed modem means said priority assignment control means comprising plural cascaded logic circuit means, one of said logic circuit means being included in each of said modem modules.
Claim 2
Dependent Claim
235 words
In combination, plural on-line modem modules each including heterodyning and signalling modem means and controlled multiplexing means for connecting a first port thereof with one of second and third ports, said second port being connected to said modem means, a redundant modem module having heterodyning and signalling modem means connected to said third ports of said multiplexers in said on-line modem modules, said heterdyning means in said redundant module being frequency adjustable in accordance with a frequency control signal, priority assignment control means connected to said modem means and said multiplexers of said on-line modem modules for normally controlling said multiplexers to connect said first and second ports and responsive to sensing a failure of said modem means for connecting said first and third ports of said multiplexer of a failed one of said modem means, said control means including priority assignment means for connecting said first and third ports of only one of said multiplexers in accordance with a predetermined modem hierarchy, and frequency implementing means responsive to said control means connecting said first and third ports of a failed modem means for supplying said frequency control signal to said heterodyne modem means in said redundant modem module to substantially duplicate the operational frequency of said failed modem means said priority assignment control means comprising plural cascaded logic circuit means, one of said logic circuit means being included in each of said modem modules.
Claim 3
Dependent Claim
286 words
In combination, plural on-line modem modules each including heterodyning and signalling modem means and controlled multiplexing means for connecting a first port thereof with one of second and third ports, said second port being connected to said modem means, a redundant modem module having heterodyning and signalling modem means connected to said third ports of said multiplexers in said on-line modem modules, said heterodyning means in said redundant module being frequency adjustable in accordance with a frequency control signal, priority assignment control means connected to said modem means and said multiplexers of said on-line modules for normally controlling said multiplexers to connect said first and second ports and responsive to sensing a failure of said modem means for connecting said first and third ports of said multiplexer of a failed one of said modem means, said control means including priority assignment means for connecting said first and third ports of only one of said multiplexers in accordance with a predetermined modem hierarchy, and frequency implementing means responsive to said control means connecting said first and third ports of a failed modem means for supplying said frequency control signal to said heterodyne modem means in said redundant modem module to substantially duplicate the operational frequency of said failed modem means said priority assignment control means comprising microprocessor means connected to said modem modules for receiving signals representing the operative status of said plural module modem means, memory means connected to said microprocessor for storing a modem module hierarchy, and means connecting said microprocessor means and said module multiplexing means for selectively connecting said first and third ports of a failed one of said modem modules in accordance with the modem module hierarchy stored in said memory means.
Claim 4
Dependent Claim
286 words
In combination, plural on-line modem modules each including heterodyning and signalling modem means and controlled multiplexing means for connecting a first port thereof with one of second and third ports, said second port being connected to said modem means, a redundant modem module having heterodyning and signalling modem means connected to said third ports of said multiplexers in said on-line modem modules, said heterodyning means in said redundant module being frequency adjustable in accordance with a frequency control signal, priority assignment control means connected to said modem means and said multiplexers of said on-line modules for normally controlling said multiplexers to connect said first and second ports and responsive to sensing a failure of said modem means for connecting said first and third ports of said multiplexer of a failed one of said modem means, said control means including priority assignment means for connecting said first and third ports of only one of said multiplexers in accordance with a predetermined modem hierarchy, and frequency implementing means responsive to said control means connecting said first and third ports of a failed modem means for supplying said frequency control signal to said heterodyne modem means in said redundant modem module to substantially duplicate the operational frequency of said failed modem means said priority assignment control means comprising microprocessor means connected to said modem modules for receiving signals representing the operative status of said plural module modem means, memory means connected to said microprocessor for storing a modem module hierarchy, and means connecting said microprocessor means and said module multiplexing means for selectively connecting said first and third ports of a failed one of said modem modules in accordance with the modem module hierarchy stored in said memory means.
Claim 5
Dependent Claim
44 words
A combination as in claim 2 wherein said frequency implementing means comprises storage means included in said redundant modem module, said microprocessor storing said frequency control signal in said storage means for controlling the operative frequency of said heterodying means of redundant modem module.
References Cited (Backward Citations)
US2680162A
Cited
US3111624A
Cited
US3518549A
Cited
US3681694A
Cited
US3886318A
Cited
US3963988A
Cited
US4039947A
Cited
US4119815A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-13 | 1984-07-14 | 1985-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-13 | 1988-07-14 | 1989-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-13 | 1992-07-14 | 1993-01-13 | $7700.00 | Window Closed / Lapsed |