US4589111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arq equipped data communication system
Assignee: Ricoh Co Ltd
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Filing: 1983-06-14
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Granted: 1986-05-13
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Expires: 2003-06-14
Abstract
Abstract A data communication system having an automatic request for repetition ("ARQ") function shifts down its MODEM rate to a slower value when the number of trials of retransmission has reached a predetermined value. In the present system, the predetermined value is supplied from the receiver to the transmitter prior to transmission operation of data from the transmitter to the receiver, thereby allowing to maintain a high use rate of the transmission line without significantly decreasing the overall data transmission speed.
Inventors
- 👤 Eiichi Adachi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:49
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/0001; H04L1/0033; H04L1/0034; H04L1/0002; H04L1/0023; H04L1/0025; H04L1/12; H04L1/16; H04L1/18; H04L1/1867; H04N; H04N1/00; H04N1/32; H04N1/333; H04N1/3333; H04N2201/00; H04N2201/32; H04N2201/333; H04N2201/33307; H04N2201/33342; H04N2201/3335
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
145 words
A data communication system comprising: a transmitter for transmitting data at a variable MODEM rate; a receiver for receiving said data transmitted from said transmitter at a variable MODEM rate; a transmission line connecting said transmitter to said receiver; means for retransmitting at least a part of said data from said transmitter to said receiver at a second MODEM rate when the number of trails of retransmission of said at least a part of said data at a first MODEM rate has reached a first predetermined number; and means for supplying said first predetermined number from said receiver to said transmitter prior to transmission of said at least a part of said data from said transmitter to said receiver thereby allowing to set said first predetermined number varyingly depending on said receiver connected to said transmitter for communication of said data through said transmission line.
Claim 2
Dependent Claim
145 words
A data communication system comprising: a transmitter for transmitting data at a variable MODEM rate; a receiver for receiving said data transmitted from said transmitter at a variable MODEM rate; a transmission line connecting said transmitter to said receiver; means for retransmitting at least a part of said data from said transmitter to said receiver at a second MODEM rate when the number of trails of retransmission of said at least a part of said data at a first MODEM rate has reached a first predetermined number; and means for supplying said first predetermined number from said receiver to said transmitter prior to transmission of said at least a part of said data from said transmitter to said receiver thereby allowing to set said first predetermined number varyingly depending on said receiver connected to said transmitter for communication of said data through said transmission line.
Claim 3
Dependent Claim
33 words
A system of claim 1, wherein said transmitter includes means for storing a second predetermined number and means for selecting one of said first and second predetermined numbers for use by comparison therebetween.
Claim 4
Dependent Claim
25 words
A system of claim 2, wherein said means for selecting includes a logic circuit to select the one which is smaller in number for use.
Claim 5
Dependent Claim
24 words
A system of claim 1 wherein said transmitter transmits data to said receiver block by block, each block including a predetermined number of data.
Claim 6
Dependent Claim
12 words
A system of claim 4, wherein said data includes facsimile image information.
Claim 7
Dependent Claim
30 words
A system of claim 1, wherein said means for retransmitting includes a MODEM rate shift-down structure which causes to set said second MODEM rate slower than said first MODEM rate.
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) | 1989-05-12 | 1989-11-11 | 1990-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-12 | 1993-11-11 | 1994-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-12 | 1997-11-11 | 1998-05-13 | $7700.00 | Window Closed / Lapsed |