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US5740198A Expired / Lapsed US ⏱️ 0.0 years remaining

Apparatus for increasing SCSI bus length through special transmission of only two bus signals

Assignee: Degelman Industries Ltd
•
Filing: 1994-06-17
•
Granted: 1998-04-14
•
Expires: 2014-06-17
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Abstract

Abstract A cable used for transmitting the signals of a communications bus, such as a SCSI bus, having arbitration control signals subject to a wired-or glitch--such as the SCSI BSY signal. Low characteristic impedence conductors ensure that voltage reflections resulting from the deassertion of the BSY signal do not exceed a minimum threshold signal assertion voltage, allowing an increase in the maximum length of the SCSI bus cable.

Inventors

  • 👤 William E. Ham

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-06 12:00
CPC Classifications
H; H01; H01B; H01B11/00; H01B11/02; H01B11/12

Claims Analysis

Total Claims: 12
Claim 1
Independent Claim 170 words
Apparatus for transmitting communications bus signals between devices, said communications bus signals including a control signal subject to a wired-or glitch, the apparatus comprising: a cable comprising: a first conductor for transmitting the control signal subject to said wired-or glitch, the first conductor having a first characteristic: impedance, the first characteristic impedance being sufficiently low to ensure that the wired-or glitch resulting from the deassertion of said control signal on said first conductor by one of said devices does not exceed a minimum threshold signal assertion voltage; other conductors for transmitting the remaining communications bus signals, each of said other conductors having a second characteristic impedance higher than said first characteristic impedance; and connectors coupled to the cable, each said connector adapted for mating with a device connector on one of said devices, each said connector coupled to said first conductor and said other conductors for transfer of the communications bus signals between devices such that the control signal subject to the wired-or glitch is transmitted via the first conductor.
Claim 2
Dependent Claim 170 words
Apparatus for transmitting communications bus signals between devices, said communications bus signals including a control signal subject to a wired-or glitch, the apparatus comprising: a cable comprising: a first conductor for transmitting the control signal subject to said wired-or glitch, the first conductor having a first characteristic: impedance, the first characteristic impedance being sufficiently low to ensure that the wired-or glitch resulting from the deassertion of said control signal on said first conductor by one of said devices does not exceed a minimum threshold signal assertion voltage; other conductors for transmitting the remaining communications bus signals, each of said other conductors having a second characteristic impedance higher than said first characteristic impedance; and connectors coupled to the cable, each said connector adapted for mating with a device connector on one of said devices, each said connector coupled to said first conductor and said other conductors for transfer of the communications bus signals between devices such that the control signal subject to the wired-or glitch is transmitted via the first conductor.
Claim 3
Dependent Claim 33 words
The apparatus of claim 1 wherein said first conductor is surrounded by a medium, the medium having a sufficiently high effective dielectric constant to provide said first conductor with said first characteristic impedance.
Claim 4
Dependent Claim 24 words
The apparatus of claim 2 wherein said communications bus signals comprise a SCSI bus, and wherein said control signal is the BSY control signal.
Claim 5
Dependent Claim 176 words
Apparatus for transmitting SCSI bus signals between devices, said SCSI bus signals including a BSY signal subject to a wired-or glitch, the apparatus comprising: a cable comprising: a first conductor for transmitting said BSY signal, the first conductor being surrounded by a medium having a sufficiently high effective dielectric constant to provide said first conductor with a first characteristic impedance sufficiently low to ensure that the wired-or glitch resulting from the deassertion of the BSY signal on said first conductor by one of said devices does not exceed a minimum threshold signal assertion voltage; other conductors for transmitting the remaining SCSI bus signals, each of said other conductors having a second characteristic impedance higher than said first characteristic impedance; and SCSI connectors coupled to the cable, each SCSI connector adapted for mating with a device SCSI connector on one of said devices, each said SCSI connector coupled to said first conductor and said other conductors for transfer of the SCSI bus signals between the devices such that the BSY signal is transmitted via the first conductor.
Claim 6
Dependent Claim 176 words
Apparatus for transmitting SCSI bus signals between devices, said SCSI bus signals including a BSY signal subject to a wired-or glitch, the apparatus comprising: a cable comprising: a first conductor for transmitting said BSY signal, the first conductor being surrounded by a medium having a sufficiently high effective dielectric constant to provide said first conductor with a first characteristic impedance sufficiently low to ensure that the wired-or glitch resulting from the deassertion of the BSY signal on said first conductor by one of said devices does not exceed a minimum threshold signal assertion voltage; other conductors for transmitting the remaining SCSI bus signals, each of said other conductors having a second characteristic impedance higher than said first characteristic impedance; and SCSI connectors coupled to the cable, each SCSI connector adapted for mating with a device SCSI connector on one of said devices, each said SCSI connector coupled to said first conductor and said other conductors for transfer of the SCSI bus signals between the devices such that the BSY signal is transmitted via the first conductor.
Claim 7
Independent Claim 180 words
An apparatus for transmitting communications bus signals between devices, said communications bus signals including control signals subject to a wired-or glitch, the apparatus comprising: a cable comprising: a first set of conductors for transmitting the control signals subject to said wired-or glitch, each of said conductors of said first set of conductors having a first characteristic impedance such that an arbitration control signal deassertion on any of the conductors of the first set of conductors by one of said devices does not exceed a minimum threshold signal assertion voltage; a second set of conductors for transmitting the remaining communications bus signals, the conductors of said second set of conductors having a second characteristic impedance higher than said first characteristic impedance; and connectors coupled to the cable, each said connector adapted for mating with a device connector on one of said devices, each said connector coupled to said first and second sets of conductors for transfer of the communications bus signals between devices such that the control signals subject to the wired-or glitch are transmitted via the first set of conductors.
Claim 8
Independent Claim 180 words
An apparatus for transmitting communications bus signals between devices, said communications bus signals including control signals subject to a wired-or glitch, the apparatus comprising: a cable comprising: a first set of conductors for transmitting the control signals subject to said wired-or glitch, each of said conductors of said first set of conductors having a first characteristic impedance such that an arbitration control signal deassertion on any of the conductors of the first set of conductors by one of said devices does not exceed a minimum threshold signal assertion voltage; a second set of conductors for transmitting the remaining communications bus signals, the conductors of said second set of conductors having a second characteristic impedance higher than said first characteristic impedance; and connectors coupled to the cable, each said connector adapted for mating with a device connector on one of said devices, each said connector coupled to said first and second sets of conductors for transfer of the communications bus signals between devices such that the control signals subject to the wired-or glitch are transmitted via the first set of conductors.
Claim 9
Dependent Claim 47 words
The apparatus of claim 5 wherein each of the conductors of said first set of conductors is surrounded by a medium, the medium having a sufficiently high effective dielectric constant to provide each of said conductors of said first set of conductors with said first characteristic impedance.
Claim 10
Dependent Claim 26 words
The apparatus of claim 6 wherein said communications bus signals comprise a SCSI bus, and wherein said control signals are the BSY and SEL control signals.
Claim 11
Independent Claim 205 words
An apparatus for transmitting SCSI bus signals between devices, said SCSI bus signals including BSY and SEL control signals subject to a wired-or glitch, the apparatus comprising: a cable comprising: a first set of conductors for transmitting said BSY and SEL control signals, each of the conductors of the first set of conductors being surrounded by a medium having a sufficiently high effective dielectric constant to provide said conductors with a first characteristic impedance sufficiently low to ensure that the wired-or glitch resulting from the deassertion of the BSY or SEL signal on a conductor of said first set of conductors by one of said devices does not exceed a minimum threshold signal assertion voltage; a second set of conductors for transmitting the remaining SCSI bus signals, each of said a second set of conductors having a second characteristic impedance higher than said first characteristic impedance; and SCSI connectors coupled to the cable, each said connector adapted for mating with a device connector on one of said devices, each said connector coupled to said first and second sets of conductors for transfer of the SCSI bus signals between devices such that the BSY and SEL control signals are transmitted via the first set of conductors.
Claim 12
Independent Claim 205 words
An apparatus for transmitting SCSI bus signals between devices, said SCSI bus signals including BSY and SEL control signals subject to a wired-or glitch, the apparatus comprising: a cable comprising: a first set of conductors for transmitting said BSY and SEL control signals, each of the conductors of the first set of conductors being surrounded by a medium having a sufficiently high effective dielectric constant to provide said conductors with a first characteristic impedance sufficiently low to ensure that the wired-or glitch resulting from the deassertion of the BSY or SEL signal on a conductor of said first set of conductors by one of said devices does not exceed a minimum threshold signal assertion voltage; a second set of conductors for transmitting the remaining SCSI bus signals, each of said a second set of conductors having a second characteristic impedance higher than said first characteristic impedance; and SCSI connectors coupled to the cable, each said connector adapted for mating with a device connector on one of said devices, each said connector coupled to said first and second sets of conductors for transfer of the SCSI bus signals between devices such that the BSY and SEL control signals are transmitted via the first set of conductors.

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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) 2001-04-13 2001-10-13 2002-04-14 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2005-04-13 2005-10-13 2006-04-14 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2009-04-13 2009-10-13 2010-04-14 $7700.00 Window Closed / Lapsed

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