Electrical computers and digital processing systems: support – Clock – pulse – or timing signal generation or analysis
Reexamination Certificate
2005-09-09
2008-11-18
Suryawanshi, Suresh K (Department: 2115)
Electrical computers and digital processing systems: support
Clock, pulse, or timing signal generation or analysis
C713S502000, C713S503000
Reexamination Certificate
active
07454648
ABSTRACT:
A system, method and computer program product for calibrating a Time Of Day (TOD)-clock in a computing system node provided in a multi-node network. The network comprises an infrastructure of computing devices each having a physical clock providing a time base for executing operations that is stepped to a common oscillator. The system implements steps for obtaining samples of timing values of a computing device in the network, the values including a physical clock value maintained at that device and a TOD-offset value; computing an oscillator skew value from the samples; setting a fine steering rate value as equal to the opposite of the computed oscillator skew value; and, utilizing the fine steering rate value to adjust the physical clock value and correct for potential oscillator skew errors occurring in the oscillator crystal at the computing device.
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Dahlen Dennis J.
Elko David A.
Smith, Sr. Ronald M.
Zhang Li
Campbell John E.
International Business Machines - Corporation
Scully , Scott, Murphy & Presser, P.C.
Suryawanshi Suresh K
LandOfFree
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