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公开(公告)号：JP2002344420A
公开(公告)日：2002-11-29
申请号：JP2002078654
申请日：2002-03-20
Applicant: IBM
Inventor： DAVIS GORDON TAYLOR , DERBY JEFFREY HASKELL , ELEFTHERIOU EVANGELOS STAVROS , OELCER SEDAT , WARE MALCOLM SCOTT
Abstract: PROBLEM TO BE SOLVED: To reduce electric power demand of the line driver of a DSL server modem, by limiting the bandwidth of signals to be transmitted to a related client modem (namely, limiting power in signals), excluding the case where a client is intending data reception in a current physical frame (not in idle state). SOLUTION: A low-power DSL modem transmitter suited for incorporation into an integral DSLAM server line card transmits all the power physical frame, including a control channel and a data field when there are data to be transmitted, and transmits a physical frame having only the control channel or the control channel and a low-power synchronous field, when there are no data to be transmitted. By regulating the flow of data packets to the DSL selectively, a method for controlling total power consumed in the integral DSLAM is provided.
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公开(公告)号：CA2871865A1
公开(公告)日：2013-12-05
申请号：CA2871865
申请日：2013-05-15
Applicant: IBM
Inventor： CIDECIYAN ROY DARON , HUTCHINS ROBERT ALLEN , MITTELHOLZER THOMAS , OELCER SEDAT
Abstract: In one embodiment, a data storage system includes a write channel for writing data to a storage medium, the write channel configured to utilize a partial reverse concatenated modulation code. The write channel includes logic adapted for encoding data sets using a C2 encoding scheme, logic adapted for adding a header to each subunit of the data sets, logic adapted for encoding the headers of the data sets with a first modulation encoding scheme, logic adapted for encoding data portions of the data sets with a second modulation encoding scheme, logic adapted for encoding portions of the one or more C2-encoded data sets using a C1 encoding scheme, logic adapted for combining the C1-encoded portions with the modulation-encoded headers of the C2-encoded data sets using a multiplexer, and logic adapted for writing the one or more combined C1- and C2-encoded data sets to data tracks.
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公开(公告)号：AU2003224007A1
公开(公告)日：2003-10-08
申请号：AU2003224007
申请日：2003-03-10
Applicant: IBM
Inventor： ELEFTHERIOU EVANGELOS S , OELCER SEDAT , ABDELILAH YOUSSEF , DAVIS GORDON TAYLOR , DERBY JEFF H , HWANG DONGMING , WARE MALCOLM , YE HUA
Abstract: A method and systems for optimizing Asymmetric Digital Subscriber Line (ADSL) connections in DSL Access Multiplexor (DSLAM) that marries benefits of G.dmt and G.lite standards, using a flexible method implemented on a programmable Digital Signal Processor (DSP) and a Network Processor (NP) is disclosed. It provides a means to support full G.dmt rates for any of the attached users as long as less than half the users are actively moving data through the DSLAM, but by only using half the digital signal processing hardware and half the power consumption for the line drivers. The invention allows doubling the number of,ADSL ports available over a conventional scheme given about 20% more power is under 50% with only half the respective connections, all those G.dmt rates possible on their exceeds 50%, gradually active G.lite rates based on either based on a tiered tariff structure, until ultimately, when the utilization reaches 100%, all subscribers will be forced back to a maximum rate afforded by G.lite. Only as utilization drops back off, will active subscribers be brought back up to G.dmt's maximum transmission rates. Once the utilization drops below 50% again, then all active subscribers will be able to utilize G.dmt's maximum transmission rates. budget. When the utilization subscribers active on their users experience the maximum wire. However, when utilization subscribers start to experience a fixed policy or one that is based on a tiered tariff structure, until ultimately, when the utilization reaches 100%, all subscribers will be forced back to a maximum rate afforded by G.lite. Only as utilization drops back off, will active subscribers be brought back up to G.dmt's maximum transmission rates. Once the utilization drops below 50% again, then all active subscribers will be able to utilize G.dmt's maximum transmission rates.
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公开(公告)号：DE60301620D1
公开(公告)日：2005-10-20
申请号：DE60301620
申请日：2003-03-10
Applicant: IBM
Inventor： ELEFTHERIOU S , OELCER SEDAT , ABDELILAH YOUSSEF , DAVIS TAYLOR , DERBY H , HWANG DONGMING , WARE MALCOLM , YE HUA
Abstract: A method and systems for optimizing Asymmetric Digital Subscriber Line (ADSL) connections in DSL Access Multiplexor (DSLAM) that marries benefits of G.dmt and G.lite standards, using a flexible method implemented on a programmable Digital Signal Processor (DSP) and a Network Processor (NP) is disclosed. It provides a means to support full G.dmt rates for any of the attached users as long as less than half the users are actively moving data through the DSLAM, but by only using half the digital signal processing hardware and half the power consumption for the line drivers. The invention allows doubling the number of,ADSL ports available over a conventional scheme given about 20% more power is under 50% with only half the respective connections, all those G.dmt rates possible on their exceeds 50%, gradually active G.lite rates based on either based on a tiered tariff structure, until ultimately, when the utilization reaches 100%, all subscribers will be forced back to a maximum rate afforded by G.lite. Only as utilization drops back off, will active subscribers be brought back up to G.dmt's maximum transmission rates. Once the utilization drops below 50% again, then all active subscribers will be able to utilize G.dmt's maximum transmission rates. budget. When the utilization subscribers active on their users experience the maximum wire. However, when utilization subscribers start to experience a fixed policy or one that is based on a tiered tariff structure, until ultimately, when the utilization reaches 100%, all subscribers will be forced back to a maximum rate afforded by G.lite. Only as utilization drops back off, will active subscribers be brought back up to G.dmt's maximum transmission rates. Once the utilization drops below 50% again, then all active subscribers will be able to utilize G.dmt's maximum transmission rates.
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公开(公告)号：DE69427135D1
公开(公告)日：2001-05-23
申请号：DE69427135
申请日：1994-12-28
Applicant: IBM
Inventor： CHERUBINI GIOVANNI , OELCER SEDAT , UNGERBOECK GOTTFRIED
IPC: H03H21/00 , H04B3/06 , H04L25/03 , H04L25/497
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Patent Agency Ranking16.发明专利
公开(公告)号：DE112012004886T5
公开(公告)日：2014-09-11
申请号：DE112012004886
申请日：2012-11-09
Applicant: IBM
Inventor： HUTCHINS ROBERT ALLEN , OELCER SEDAT , GALE ERNEST STEWART , CHRISTENSEN ERIC ROLF
IPC: G11B5/035
Abstract: Ein Verfahren, um auszuwählen, welche Tap-Koeffizienten eines programmierbaren Equalizers mit endlicher Impulsantwort (FIR) festzusetzen sind, wird offenbart. In einer Ausführungsform beinhaltet solch ein Verfahren ein Durchführen einer anfänglichen Kalibirierung, um einen Anfangswert für jeden Tap-Koeffizienten eines FIR-Equalizers zu ermitteln. Diese Anfangswerte können verwendet werden, um einen ersten Signalverlauf zu erzeugen. Dann wird durch das Verfahren eine Operation am ersten Signalverlauf durchgeführt, um einen zweiten Signalverlauf zu erzeugen, der mehrere Schleifen aufweist. Dann wird der zweite Signalverlauf analysiert, um eine oder mehrere Schleifen des zweiten Signalverlaufs zu ermitteln, welche die größte Fläche besitzen. Bei dem Verfahren werden dann die Koeffizienten eines oder mehrerer Taps festgesetzt, die der Schleife oder den Schleifen mit der größten Fläche am nächsten liegen. Eine entsprechende Vorrichtung und ein entsprechendes Computerprogrammprodukt werden ebenfalls offenbart.
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公开(公告)号：DE602006009123D1
公开(公告)日：2009-10-22
申请号：DE602006009123
申请日：2006-07-03
Applicant: IBM
Inventor： ELEFTHERIOU EVANGELOS , OELCER SEDAT , JAQUETTE GLEN ALAN , JELITTO JENS , HUTCHINS ROBERT ALLAN
Abstract: A read channel and method using that read channel are disclosed. The read channel comprises an analog to digital converter which asynchronously samples at a fixed rate an analog signal formed by reading a data track, where that data track was written to a data storage medium at a symbol rate and an interpolator interconnected with the analog to digital converter. The read channel further comprises a fractionally-spaced equalizer, where the interpolator provides an interpolated signal to the fractionally-spaced equalizer at an interpolation rate, where that interpolation rate is greater than the symbol rate. The fractionally-spaced equalizer forms a synchronous equalized signal. The read channel further comprises a gain control module interconnected with the fractionally-spaced equalizer, and a sequence detector interconnected with the gain control module.
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公开(公告)号：AT442651T
公开(公告)日：2009-09-15
申请号：AT06792475
申请日：2006-07-03
Applicant: IBM
Inventor： ELEFTHERIOU EVANGELOS , OELCER SEDAT , JAQUETTE GLEN , JELITTO JENS , HUTCHINS ROBERT
Abstract: A read channel and method using that read channel are disclosed. The read channel comprises an analog to digital converter which asynchronously samples at a fixed rate an analog signal formed by reading a data track, where that data track was written to a data storage medium at a symbol rate and an interpolator interconnected with the analog to digital converter. The read channel further comprises a fractionally-spaced equalizer, where the interpolator provides an interpolated signal to the fractionally-spaced equalizer at an interpolation rate, where that interpolation rate is greater than the symbol rate. The fractionally-spaced equalizer forms a synchronous equalized signal. The read channel further comprises a gain control module interconnected with the fractionally-spaced equalizer, and a sequence detector interconnected with the gain control module.
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公开(公告)号：AT304784T
公开(公告)日：2005-09-15
申请号：AT03720383
申请日：2003-03-10
Applicant: IBM
Inventor： ELEFTHERIOU EVANGELOS S , OELCER SEDAT , ABDELILAH YOUSSEF , DAVIS GORDON TAYLOR , DERBY JEFF H , HWANG DONGMING , WARE MALCOLM , YE HUA
Abstract: A method and systems for optimizing Asymmetric Digital Subscriber Line (ADSL) connections in DSL Access Multiplexor (DSLAM) that marries benefits of G.dmt and G.lite standards, using a flexible method implemented on a programmable Digital Signal Processor (DSP) and a Network Processor (NP) is disclosed. It provides a means to support full G.dmt rates for any of the attached users as long as less than half the users are actively moving data through the DSLAM, but by only using half the digital signal processing hardware and half the power consumption for the line drivers. The invention allows doubling the number of,ADSL ports available over a conventional scheme given about 20% more power is under 50% with only half the respective connections, all those G.dmt rates possible on their exceeds 50%, gradually active G.lite rates based on either based on a tiered tariff structure, until ultimately, when the utilization reaches 100%, all subscribers will be forced back to a maximum rate afforded by G.lite. Only as utilization drops back off, will active subscribers be brought back up to G.dmt's maximum transmission rates. Once the utilization drops below 50% again, then all active subscribers will be able to utilize G.dmt's maximum transmission rates. budget. When the utilization subscribers active on their users experience the maximum wire. However, when utilization subscribers start to experience a fixed policy or one that is based on a tiered tariff structure, until ultimately, when the utilization reaches 100%, all subscribers will be forced back to a maximum rate afforded by G.lite. Only as utilization drops back off, will active subscribers be brought back up to G.dmt's maximum transmission rates. Once the utilization drops below 50% again, then all active subscribers will be able to utilize G.dmt's maximum transmission rates.
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公开(公告)号：CA2871865C
公开(公告)日：2021-01-26
申请号：CA2871865
申请日：2013-05-15
Applicant: IBM
Inventor： CIDECIYAN ROY DARON , HUTCHINS ROBERT ALLEN , MITTELHOLZER THOMAS , OELCER SEDAT
Abstract: In one embodiment, a data storage system includes a write channel for writing data to a storage medium, the write channel configured to utilize a partial reverse concatenated modulation code. The write channel includes logic adapted for encoding data sets using a C2 encoding scheme, logic adapted for adding a header to each subunit of the data sets, logic adapted for encoding the headers of the data sets with a first modulation encoding scheme, logic adapted for encoding data portions of the data sets with a second modulation encoding scheme, logic adapted for encoding portions of the one or more C2-encoded data sets using a C1 encoding scheme, logic adapted for combining the C1-encoded portions with the modulation-encoded headers of the C2-encoded data sets using a multiplexer, and logic adapted for writing the one or more combined C1- and C2-encoded data sets to data tracks.
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