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    3.
    发明专利
    未知

    公开(公告)号：DE3586758T2

    公开(公告)日：1993-04-22

    申请号：DE3586758

    申请日：1985-04-30

    Applicant: IBM

    Inventor： BELLOC JACQUES ,  CHOLAT-NAMY JEAN ,  CHOQUET MICHEL ,  HUON SIMON ,  PILOST DANIEL ,  SPAGNOL VICTOR ,  DE SAINT MICHEL FRANCOIS

    IPC: H04L69/40 ,  H04L1/24 ,  H04L12/26

    Abstract: A DTE can control the modems attached thereto by transmitting command messages over the data path and analyzing report messages supplied by the modems in return. Each command message is identified by a specific header. A command message intended for a remote modem (34) is intercepted by the local modem (30) and reformatted so as to obtain a supervisory message that is then transmitted at the rate of one bit per baud. A command message intended for a remote multichannel modem (48) is transmitted either by a supervisory message or in the data mode of operation.

    SYNCHRONIZING DEVICE FOR THE RECEIVER CLOCK OF A DATA TRANSMISSION SYSTEM USING PSK MODULATION
    4.
    发明专利
    SYNCHRONIZING DEVICE FOR THE RECEIVER CLOCK OF A DATA TRANSMISSION SYSTEM USING PSK MODULATION 未知

    公开(公告)号：CA1092654A

    公开(公告)日：1980-12-30

    申请号：CA282527

    申请日：1977-07-12

    Applicant: IBM

    Inventor： CHOQUET MICHEL ,  PILOST DANIEL ,  VADE ANDRE

    IPC: H04L7/00

    Abstract: SYNCHRONIZING DEVICE FOR THE RECEIVER CLOCK OF A DATA TRANSMISSION SYSTEM USING PSK MODULATION This invention relates to a new clock synchronizing arrangement for use in -the receiving device of a data transmission system employing PSK modulation. In PSK systems, the received signal x(t), for a given carrier angular frequency .omega.c can be defined by its envelope and its phase r (t) and ?(t), respectively. r(t) and ?(t) can be expressed by: and where x(t) is the Hilbert Transform of x(t). At the optimum signalling instant topt, r(topt) and ?(topt) normalized (without the data) exhibit the minimum variance. The clock adjustment signal is derived from the variance of the envelope or the variance of the phase of the received signal.

    5.
    发明专利
    未知

    公开(公告)号：DE68908149T2

    公开(公告)日：1994-03-17

    申请号：DE68908149

    申请日：1989-01-10

    Applicant: IBM

    Inventor： BELLOC JACQUES ,  PILOST DANIEL ,  QUINTIN MICHEL

    IPC: H04L27/36 ,  H04L27/00 ,  H04L27/38

    Abstract: Modem receiving from/transmitting to a DTE data bits at a rate DR and adapted for operating at a modulation rate MR in an environment operating at a basic rate BR. In the receiving way, it comprises a first means for converting a number X of samples received at a frequency FS into a number X.MR/BR of samples before processing these samples by the signal processor whereby the processing results in DR/BR words of DR/MR bits, and second means for converting the DR/BR words into DR/MR words of DR/BR bits to be transmitted to the DTE. For the transmitting way the first and second converting means, are the same means but run in the reverse order. The result is that such an adapted modem behaves as a modem operating at a modulation rate MR on a periodic process interval of DR/(BR.MR) s.

    8.
    发明专利
    未知

    公开(公告)号：DE68908149D1

    公开(公告)日：1993-09-09

    申请号：DE68908149

    申请日：1989-01-10

    Applicant: IBM

    Inventor： BELLOC JACQUES ,  PILOST DANIEL ,  QUINTIN MICHEL

    IPC: H04L27/36 ,  H04L27/00 ,  H04L27/38

    Abstract: Modem receiving from/transmitting to a DTE data bits at a rate DR and adapted for operating at a modulation rate MR in an environment operating at a basic rate BR. In the receiving way, it comprises a first means for converting a number X of samples received at a frequency FS into a number X.MR/BR of samples before processing these samples by the signal processor whereby the processing results in DR/BR words of DR/MR bits, and second means for converting the DR/BR words into DR/MR words of DR/BR bits to be transmitted to the DTE. For the transmitting way the first and second converting means, are the same means but run in the reverse order. The result is that such an adapted modem behaves as a modem operating at a modulation rate MR on a periodic process interval of DR/(BR.MR) s.

    9.
    发明专利
    未知

    公开(公告)号：DE3586758D1

    公开(公告)日：1992-11-19

    申请号：DE3586758

    申请日：1985-04-30

    Applicant: IBM

    Inventor： BELLOC JACQUES ,  CHOLAT-NAMY JEAN ,  CHOQUET MICHEL ,  HUON SIMON ,  PILOST DANIEL ,  SPAGNOL VICTOR ,  DE SAINT MICHEL FRANCOIS

    IPC: H04L69/40 ,  H04L1/24 ,  H04L12/26

    Abstract: Data terminal equipment (10) sends commands identified by specific headers to the modems over a channel, and analyses the return messages. A command to a distant modem (34) is intercepted by the local modem (30) and its format is changed into a supervisory message with a different header, for transmission at the rate of 1 bit per baud. For a distant multichannel modem (48) the command is sent either by way of a supervisory message or in data mode. Second level modems (54,58) also may be monitored by addressed data-mode comands. commands.

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