Patent US3603736A successfully refreshed from Google Patents.
US3603736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telecommunication exchanges
Assignee: Ericsson Telephones Ltd
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Filing: 1969-09-05
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Granted: 1971-09-07
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Expires: 1989-09-05
Abstract
Abstract A telecommunication exchange having groups of highways carrying pulse code modulated signals and, for each group, a working superhighway shared by signals carried on the highways of the group, which exchange includes a working spare superhighway to which signals are applied simultaneously with their application to the working superhighways and fault detection means responsive to a fault on a working superhighway or on the working spare superhighway to suppress transmission over the faulty superhighway.
Inventors
- 👤 Terence David Morroll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:47
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/74; H04Q; H04Q11/00; H04Q11/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
229 words
A telecommunication exchange having a number of working receive superhighways and a spare receive superhighway, a working transmit superhighway corresponding to each working receive superhighway and a spare transmit superhighway, cords assignable to calls routed through the exchange, a working array of receive gates connecting the working receive superhighways to the cords, and further receive gates connecting the spare receive superhighway to the cords, a working array of transmit gates connecting the cords to the working transmit superhighways, and further transmit gates connecting the cords to the spare transmit superhighway, characterized by association means by way of which signals deliverable to a cord from a working receive superhighway are also deliverable at the same time to the cord from the spare receive superhighway through one of said further receive gates, the further transmit gates being operable so that signals deliverable from a cord to a working transmit superhighway are also deliverable at the same time to the spare transmit superhighway, and security means operable in the event of a fault on a receive superhighway to prevent delivery of signals from the faulty receive superhighway to a cord, and in the event of a fault on a transmit superhighway to prevent delivery of signals from the cords to the faulty transmit superhighway, delivery of signals over the relevant spare superhighway being maintained uninterrupted by the operation of the security means.
Claim 2
Dependent Claim
229 words
A telecommunication exchange having a number of working receive superhighways and a spare receive superhighway, a working transmit superhighway corresponding to each working receive superhighway and a spare transmit superhighway, cords assignable to calls routed through the exchange, a working array of receive gates connecting the working receive superhighways to the cords, and further receive gates connecting the spare receive superhighway to the cords, a working array of transmit gates connecting the cords to the working transmit superhighways, and further transmit gates connecting the cords to the spare transmit superhighway, characterized by association means by way of which signals deliverable to a cord from a working receive superhighway are also deliverable at the same time to the cord from the spare receive superhighway through one of said further receive gates, the further transmit gates being operable so that signals deliverable from a cord to a working transmit superhighway are also deliverable at the same time to the spare transmit superhighway, and security means operable in the event of a fault on a receive superhighway to prevent delivery of signals from the faulty receive superhighway to a cord, and in the event of a fault on a transmit superhighway to prevent delivery of signals from the cords to the faulty transmit superhighway, delivery of signals over the relevant spare superhighway being maintained uninterrupted by the operation of the security means.
Claim 3
Dependent Claim
219 words
An exchange as claimed in claim 1 in which a cord assigned to a call is capable of delivering an address signal identifying a working receive and the corresponding transmit superhighways used for the call to which the cord is assigned, the address signal priming a receive gate and a transmit gate appropriate to connect the cord to the said selected and corresponding superhighways; characterized in that the association means comprise a cyclic counting device operable to deliver a cycle of selection and switching pulses and coded pulses coincident with said selection pulses the selection pulses identifying each working receive superhighway in turn as well as a working transmit superhighway corresponding to a selected receive superhighway, entrance and exit gates controlled by said selection pulses whereby signals applied to a selected working receive superhighway are also applied to the spare receive superhighway and signals delivered by the working transmit superhighway corresponding to the selected receive superhighway are also delivered by the spare transmit superhighway, and a gate address comparator individual to each cord for comparing an address signal read from the cord to which the comparator relates with coded pulses delivered by the counting deVice, the comparator operating in the event of parity to prime the further receive and further transmit gates connecting the cord to the spare superhighways.
Claim 4
Dependent Claim
170 words
An exchange as claimed in claim 2 characterized by receive and transmit comparators operable in dependence on said selection pulses to compare signals on a working superhighway with signals on a spare superhighway while the superhighways are associated with each other by the association means, a comparator generating a disparity signal if a comparison reveals a disparity; inhibit means individual to each working transmit superhighway selectively operable to inhibit delivery of signals by the said superhighways; and a fault analysis circuit operable in response to a disparity signal generated during the association of a working superhighway with a spare superhighway if a disparity signal has also been generated during each of a succession of preceding associations of said working and spare superhighways, the circuit operating at the time a disparity signal is applied thereto firstly to suspend the operation of the cyclic counting device and secondly to operate the inhibit means in respect of the working superhighway associated with the spare superhighway at the time the disparity signal was generated,
Claim 5
Dependent Claim
58 words
An exchange as claimed in claim 3 characterized in that the fault analysis circuit is responsive to a sequence of disparity signals generated during association of a spare superhighway with a sequence of working superhighways, the circuit operating after such response on the application of a switching pulse thereto to suspend the operation of the cyclic counting device.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |