US3760107A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time division multiplex communication systems
Assignee: Postmaster General
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Filing: 1971-03-22
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Granted: 1973-09-18
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Expires: 1991-03-22
Abstract
Abstract A time division multiplex telephone system has testing apparatus for testing the setting-up of a communication path between two subscribers before the path is switched through to the subscribers. Circuits responsive to signals emitted by the testing apparatus initiate a further attempt to set up the communication path if the testing apparatus signals that the test made on the set up connection indicate that the setting up is not successful.
Inventors
- 👤 W Duerdoth
- 👤 C Hughes
- 👤 J Hesketh
- 👤 W Morton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:16
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/02; H04J; H04J3/00; H04J3/02; H04J3/14; H04Q11/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
188 words
A time division multiplex communication system comprising in combination: 1. a plurality of communication channels; 2. a number of switching stages including a first switching stage and a last switching stage for providing a required connection between first and second channels of said plurality; 3. control means for locating through each of said switching stages a path suitable for the required connections; and 4. means for setting up, once each said path is located, an initial connection through said first switching stage as far as but not through said last switching stage; 5. said control means including test initiating means for A. making a test of the condition of said set-up initial connection, B. effecting an extension of said set-up initial connection through said last switching stage if said test is successful, and further C. making a test of the condition of said extended set-up initial connection to verify whether a signal is receivable by said control means over said exended set-up initial connection, and 6. said control means including further means responsive to the failure of either of said tests for attempting to set-up another initial connection.
Claim 2
Dependent Claim
188 words
A time division multiplex communication system comprising in combination: 1. a plurality of communication channels; 2. a number of switching stages including a first switching stage and a last switching stage for providing a required connection between first and second channels of said plurality; 3. control means for locating through each of said switching stages a path suitable for the required connections; and 4. means for setting up, once each said path is located, an initial connection through said first switching stage as far as but not through said last switching stage; 5. said control means including test initiating means for A. making a test of the condition of said set-up initial connection, B. effecting an extension of said set-up initial connection through said last switching stage if said test is successful, and further C. making a test of the condition of said extended set-up initial connection to verify whether a signal is receivable by said control means over said exended set-up initial connection, and 6. said control means including further means responsive to the failure of either of said tests for attempting to set-up another initial connection.
Claim 3
Dependent Claim
28 words
a number of switching stages including a first switching stage and a last switching stage for providing a required connection between first and second channels of said plurality;
Claim 4
Dependent Claim
28 words
a number of switching stages including a first switching stage and a last switching stage for providing a required connection between first and second channels of said plurality;
Claim 5
Dependent Claim
34 words
A system as claimed in claim 1, which further comprises hold means for holding at least a part of said set-up initial connection until the attempt to set-up another initial connection has been made.
Claim 6
Dependent Claim
18 words
control means for locating through each of said switching stages a path suitable for the required connections; and
Claim 7
Dependent Claim
18 words
control means for locating through each of said switching stages a path suitable for the required connections; and
Claim 8
Dependent Claim
28 words
means for setting up, once each said path is located, an initial connection through said first switching stage as far as but not through said last switching stage;
Claim 9
Dependent Claim
28 words
means for setting up, once each said path is located, an initial connection through said first switching stage as far as but not through said last switching stage;
Claim 10
Dependent Claim
72 words
said control means including test initiating means for A. making a test of the condition of said set-up initial connection, B. effecting an extension of said set-up initial connection through said last switching stage if said test is successful, and further C. making a test of the condition of said extended set-up initial connection to verify whether a signal is receivable by said control means over said exended set-up initial connection, and
Claim 11
Dependent Claim
72 words
said control means including test initiating means for A. making a test of the condition of said set-up initial connection, B. effecting an extension of said set-up initial connection through said last switching stage if said test is successful, and further C. making a test of the condition of said extended set-up initial connection to verify whether a signal is receivable by said control means over said exended set-up initial connection, and
Claim 12
Dependent Claim
22 words
said control means including further means responsive to the failure of either of said tests for attempting to set-up another initial connection.
Claim 13
Dependent Claim
22 words
said control means including further means responsive to the failure of either of said tests for attempting to set-up another initial connection.
References Cited (Backward Citations)
US3423539A
Cited
US3551601A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |