Patent US6038618A successfully refreshed from Google Patents.
US6038618A
Expired / Lapsed
US
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Bypass circuit for bypassing host computer which are connected to plurality of devices via two individual ports upon detecting lack of communication at both ports
Assignee: International Business Machines Corp
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Filing: 1997-08-08
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Granted: 2000-03-14
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Expires: 2017-08-08
Abstract
Abstract A data processing system comprises a host computer connected for the transfer of data to and from a plurality of data storage devices arranged in a string, the host computer including communication means comprising first and second ports connecting to first and second communication links, the first and second communication links being connected respectively to first and second data storage devices of said string. A bypassing means is provided between the first and second ports of the host system and the first and second data storage devices, the bypassing means being comprised of an independent bypass circuit on each of the first and second communication links between each of the first and second ports and the first and second data storage devices, the bypassing means being operable to bypass the host computer by connecting the first and second devices only when both of said independent bypass circuits detect a lack of data transfer on their respective links.
Inventors
- 👤 Reginald Beer
- 👤 Peter John Deacon
- 👤 Ian David Judd
- 👤 Neil Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:06
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/28; H04L12/42; H04L12/437
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
150 words
A communication system for a data processing system comprising a host computer connected for transferring data to and from a plurality of data storage devices arranged in a string, the communication system comprising: first and second communication links connecting, respectively, first and second data storage devices of said string to first and second sorts in the host computer; and a bypass device provided between the first and second ports of the host system and the first and second data storage devices, the bypass device being comprised of an independent bypass circuit on each of the first and second communication links between each of the first and second ports and the first and second data storage devices, the bypass device being operable to bypass the host computer by connecting the first and second devices when both of said independent bypass circuits detect a lack of data transfer on their respective links.
Claim 2
Dependent Claim
150 words
A communication system for a data processing system comprising a host computer connected for transferring data to and from a plurality of data storage devices arranged in a string, the communication system comprising: first and second communication links connecting, respectively, first and second data storage devices of said string to first and second sorts in the host computer; and a bypass device provided between the first and second ports of the host system and the first and second data storage devices, the bypass device being comprised of an independent bypass circuit on each of the first and second communication links between each of the first and second ports and the first and second data storage devices, the bypass device being operable to bypass the host computer by connecting the first and second devices when both of said independent bypass circuits detect a lack of data transfer on their respective links.
Claim 3
Dependent Claim
24 words
The communication system as claimed in claim 1, wherein the first and second ports are provided within an adapter associated with the host computer.
Claim 4
Dependent Claim
26 words
The communication system as claimed in claim 1 wherein each of the independent bypass circuits comprises a detector for detecting signal transitions on their respective links.
Claim 5
Dependent Claim
22 words
The communication system as claimed in claim 1 wherein each communication link is a full-duplex serial link comprising inbound and outbound links.
Claim 6
Dependent Claim
35 words
The communication system as claimed in claim 4, wherein each independent bypass circuit detects when there is no data transfer on its serial link by sensing the tie-up voltage on receivers on its outbound link.
Claim 7
Dependent Claim
155 words
A data processing system comprising: a host computer; a plurality of data storage devices arranged in a string connected for transferring data to and from a communication interface associated with the host computer comprising first and second ports; first and second communication links, said first and second communication links connecting, respectively, first and second data storage devices of said string to said first and second ports; a bypassing device provided between the first and second ports of the host system and the first and second data storage devices, the bypassing device comprising an independent bypass circuit on each of the first and second communication links between each of the first and second ports and the first and second data storage devices, the bypassing device being operable to bypass the host computer by connecting the first and second devices when both of said independent bypass circuits detect a lack of data transfer on their respective links.
Claim 8
Dependent Claim
155 words
A data processing system comprising: a host computer; a plurality of data storage devices arranged in a string connected for transferring data to and from a communication interface associated with the host computer comprising first and second ports; first and second communication links, said first and second communication links connecting, respectively, first and second data storage devices of said string to said first and second ports; a bypassing device provided between the first and second ports of the host system and the first and second data storage devices, the bypassing device comprising an independent bypass circuit on each of the first and second communication links between each of the first and second ports and the first and second data storage devices, the bypassing device being operable to bypass the host computer by connecting the first and second devices when both of said independent bypass circuits detect a lack of data transfer on their respective links.
Claim 9
Dependent Claim
25 words
The data processing system as claimed in claim 6, wherein the first and second ports are provided within an adapter associated with the host computer.
Claim 10
Dependent Claim
27 words
The data processing system as claimed in claim 6, wherein each of the independent bypass circuits comprises a detector for detecting signal transitions on their respective links.
Claim 11
Dependent Claim
23 words
The data processing system as claimed in claim 6 wherein each communication link is a full-duplex serial link comprising inbound and outbound links.
Claim 12
Dependent Claim
36 words
The data processing system as claimed in claim 9, wherein each independent bypass circuit detects when there is no data transfer on its serial link by sensing the tie-up voltage on receivers on its outbound link.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-03-14 | 2003-09-13 | 2004-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-03-14 | 2007-09-13 | 2008-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-03-14 | 2011-09-13 | 2012-03-14 | $7700.00 | Window Closed / Lapsed |