US3914741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fault detection arrangement for digital transmission system
Assignee: AT&T Inc
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Filing: 1973-11-01
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Granted: 1975-10-21
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Expires: 1993-11-01
Abstract
Abstract A digital information transmission system includes a control unit for transmitting digital words each including an address, message, and an error detecting code derived from the address and messsage to a plurality of uniquely addressable peripheral units over a common bus. Each peripheral unit includes a register which stores its address and when a digital word is received by a peripheral unit the address stored in its register is compared with the transmitted address and the transmitted error detecting code is compared with an error detection code generated from the received message and the stored digital address. When both the transmitted and the stored addresses match and the transmitted and the generated error detecting codes match, the utilization portion of the peripheral unit is enabled to respond to the transmitted message.
Inventors
- 👤 Richard Harlan Bonser
- 👤 Robert Joseph Willett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:17
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/07; G06F11/08; G06F11/10; H; H04; H04L; H04L1/00; H04L1/004; H04Q; H04Q3/00; H04Q3/42; H04Q3/54; H04Q3/545; H04Q3/54575; H04Q3/54591
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
143 words
In an information receiving circuit for receiving digital words which comprise a digital address portion, a digital message portion, and an error detecting code portion derived from the combination of said digital address and said digital message a protection arrangement comprising means for storing a digital address, means for comparing the digital address portion of a received digital word with the digital address stored in said storage means, encoding means for deriving an error detecting code from the combination of the digital message portion of a received digital word and the digital address stored in said storage means, means for comparing the error detecting code derived by said encoding means with the error detecting code portion of a received digital word, and means for generating an enable signal when both of said means for comparing indicate that their rEspective compared quantities are identical.
Claim 2
Dependent Claim
143 words
In an information receiving circuit for receiving digital words which comprise a digital address portion, a digital message portion, and an error detecting code portion derived from the combination of said digital address and said digital message a protection arrangement comprising means for storing a digital address, means for comparing the digital address portion of a received digital word with the digital address stored in said storage means, encoding means for deriving an error detecting code from the combination of the digital message portion of a received digital word and the digital address stored in said storage means, means for comparing the error detecting code derived by said encoding means with the error detecting code portion of a received digital word, and means for generating an enable signal when both of said means for comparing indicate that their rEspective compared quantities are identical.
Claim 3
Dependent Claim
34 words
The information receiving circuit in accordance with claim 1 further including a utilization means which is enabled to respond to the message portion of a received digital word when said enable signal is generated.
Claim 4
Dependent Claim
156 words
An information transmission system which includes a source of digital words each comprising a digital address, a digital message, and an error detecting code derived from the combination of said digital address and said digital message, and at least one receiving means for receiving said digital words further comprising storage means for storing a digital address, means for comparing a digital address received by said receiving means with the digital address stored in said storage means, encoding means for deriving an error detecting code from the combination of a message received by said receiving means and the digital address stored in said storage means, means for comparing the error detecting code derived by said encoding means with an error detecting code received by said receiving means, and means for generating an enable signal when both of said means for comparing indicate that their respective compared quantities are identical in response to one of said digital words.
Claim 5
Dependent Claim
156 words
An information transmission system which includes a source of digital words each comprising a digital address, a digital message, and an error detecting code derived from the combination of said digital address and said digital message, and at least one receiving means for receiving said digital words further comprising storage means for storing a digital address, means for comparing a digital address received by said receiving means with the digital address stored in said storage means, encoding means for deriving an error detecting code from the combination of a message received by said receiving means and the digital address stored in said storage means, means for comparing the error detecting code derived by said encoding means with an error detecting code received by said receiving means, and means for generating an enable signal when both of said means for comparing indicate that their respective compared quantities are identical in response to one of said digital words.
Claim 6
Dependent Claim
25 words
The information transmission system in accordance with claim 3 wherein each of said storage means stores a digital address unique to its associated receiving means.
Claim 7
Dependent Claim
38 words
The information transmission system in accordance with claim 4 wherein said receiving means further include a utilization means which is enabled to respond to the message portion of a received digital word when said enable signal is generated.
Claim 8
Dependent Claim
167 words
An information transmission system which includes a source of digital words each comprising a digital address, a digital message, and an error detecting code derived from the combination of said digital address and said digital message and at least one receiving means for receiving said digital words further comprising storage means for storing a digital address and an error detecting code derived from said digital address, means for comparing a digital address received by said receiving means with the digital address stored in said storage means, encoding means for deriving an error detecting code from the combination of a message received by said receiving means and the error detecting code stored in said storage means, means for comparing the error detecting code derived by said encoding means with an error detecting code received by said receiving means, and means for generating an enable signal when both of said means for comparing indicate that their respective compared quantities are identical in response to one of said digital words.
Claim 9
Dependent Claim
167 words
An information transmission system which includes a source of digital words each comprising a digital address, a digital message, and an error detecting code derived from the combination of said digital address and said digital message and at least one receiving means for receiving said digital words further comprising storage means for storing a digital address and an error detecting code derived from said digital address, means for comparing a digital address received by said receiving means with the digital address stored in said storage means, encoding means for deriving an error detecting code from the combination of a message received by said receiving means and the error detecting code stored in said storage means, means for comparing the error detecting code derived by said encoding means with an error detecting code received by said receiving means, and means for generating an enable signal when both of said means for comparing indicate that their respective compared quantities are identical in response to one of said digital words.
Claim 10
Dependent Claim
177 words
A digital information transfer system comprising: a central control unit and a plurality of peripheral units each having a corresponding unique digital address; said central control unit comprising means for generating digital words each comprising a digital message portion and the digital address of any selected one of said peripheral units, means to derive at least one parity check digit from said digital word and means to transmit said digital word and said parity check digit to said peripheral units; and wherein each of said peripheral units comprises means defining the digital address of the respective peripheral unit, means for comparing the received digital address with said defined digital address, means to derive at least one parity check digit from the received digital message and the defined digital address, means for comparing the received parity check digit with the parity check digit derived from said received digital message and said defined digital address, and means to enable the respective peripheral unit to respond to said received message when matches are indicated by both of said comparing means.
Claim 11
Dependent Claim
177 words
A digital information transfer system comprising: a central control unit and a plurality of peripheral units each having a corresponding unique digital address; said central control unit comprising means for generating digital words each comprising a digital message portion and the digital address of any selected one of said peripheral units, means to derive at least one parity check digit from said digital word and means to transmit said digital word and said parity check digit to said peripheral units; and wherein each of said peripheral units comprises means defining the digital address of the respective peripheral unit, means for comparing the received digital address with said defined digital address, means to derive at least one parity check digit from the received digital message and the defined digital address, means for comparing the received parity check digit with the parity check digit derived from said received digital message and said defined digital address, and means to enable the respective peripheral unit to respond to said received message when matches are indicated by both of said comparing means.
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) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |