-
公开(公告)号：JP2000138733A
公开(公告)日：2000-05-16
申请号：JP21014099
申请日：1999-07-26
Applicant: IBM
Inventor： DAVIS GORDON T
Abstract: PROBLEM TO BE SOLVED: To easily make an ADSL practicable by including statistical multiplexing in an ADSL modem. SOLUTION: This multidrop asymmetrical digital subscriber loop(ADSL) modem has at least two digital front end circuit sets, which enable simultaneous connection to at least two local loops. A shard DSL modem is respectively and operationally associated with at least two digital front end circuit sets and performs data transmission and reception between the digital front end circuits and itself. A digital interface 200 is operationally associated with the shared DSL modem so as to communicate with an external network.
-
公开(公告)号：JP2000134178A
公开(公告)日：2000-05-12
申请号：JP21026399
申请日：1999-07-26
Applicant: IBM
Inventor： DAVIS GORDON T
IPC: H04J11/00 , H04J1/00 , H04L5/02 , H04L5/14 , H04L27/26 , H04M3/00 , H04M11/00 , H04M11/06 , H04Q11/04 , H04L12/28 , H04L12/46
Abstract: PROBLEM TO BE SOLVED: To facilitate practical use of asymmetrical digital subscriber line ADSL by simultaneously transmitting data via a plurality of subscriber lines, extended between a shared device and a plurality of remote devices, and respectively assigning a specific destination code to each remote device in the case of a symbol based discrete multi-tone transmission system. SOLUTION: A plurality of work stations 216 each uses asymmetrical digital subscriber line ADSL (client) modem 214 to connect with each analog front end 212 of a shared ADSL server modem 210 via each twisted pair local loop 218. The shared ADSL modem 210 communicates with a digital interface 200, and the latter provides information to other network or a processor of a digital telephone network and an Internet service provider or the like.
-
公开(公告)号：CA2268366A1
公开(公告)日：2000-02-17
申请号：CA2268366
申请日：1999-04-08
Applicant: IBM
Inventor： DAVIS GORDON T
Abstract: Multi-drop Asymmetrical Digital Subscriber Loop (ADSL) modems have at least two sets of digital front end circuitry which allow for simultaneous connections to at least two local loops. A shared DSL modem is operably associated with each of the two sets of digital front end circuitry and transmits and receives data to and from the digital front end circuitry. A digital interface is operably associated with the shared DSL modem and is configured to communicate with an external network.
-
公开(公告)号：CA2000007C
公开(公告)日：1994-10-25
申请号：CA2000007
申请日：1989-10-02
Applicant: IBM
Inventor： DAVIS GORDON T , MANDALIA BAIJU D
IPC: H04L27/22 , H04L27/227 , H03D3/00
Abstract: A demodulator mechanism which uses estimates of the in-phase and quadrature-phase components or differential phase modulated carrier signals for performing a coherent demodulation of these signals is described. The instantaneous estimates, obtained from an estimator circuit, are fed into a differential carrier recovery circuit, which provides for a feedback of ideal sine and cosine components, and combined with the instantaneous estimates for incrementally decreasing a phase error signal generated in a computational circuit. By thus incrementally decreasing the phase error signal, an ideal phase angle is eventually obtained, thereby providing for coherent demodulated output components of the input carrier signals.
-
公开(公告)号：DE69939673D1
公开(公告)日：2008-11-20
申请号：DE69939673
申请日：1999-08-12
Applicant: IBM
Inventor： DAVIS GORDON T
Abstract: Multi-drop Asymmetrical Digital Subscriber Loop (ADSL) modems have at least two sets of digital front end circuitry which allow for simultaneous connections to at least two local loops. A shared DSL modem is operably associated with each of the two sets of digital front end circuitry and transmits and receives data to and from the digital front end circuitry. A digital interface is operably associated with the shared DSL modem and is configured to communicate with an external network.
-
Patent Agency Ranking
公开(公告)号：CA2268366C
公开(公告)日：2006-01-10
申请号：CA2268366
申请日：1999-04-08
Applicant: IBM
Inventor： DAVIS GORDON T
Abstract: Multi-drop Asymmetrical Digital Subscriber Loop (ADSL) modems have at least two sets of digital front end circuitry which allow for simultaneous connections to at least two local loops. A shared DSL modem is operably associated with each of the two sets of digital front end circuitry and transmits and receives data to and from the digital front end circuitry. A digital interface is operably associated with the shared DSL modem and is configured to communicate with an external network.
-
公开(公告)号：DE68918421T2
公开(公告)日：1995-03-30
申请号：DE68918421
申请日：1989-12-13
Applicant: IBM
Inventor： DAVIS GORDON T , MANDALIA BAIJU D MANDALIA BAIJ
IPC: H04L27/22 , H04L27/227
-
公开(公告)号：AT377306T
公开(公告)日：2007-11-15
申请号：AT99306377
申请日：1999-08-12
Applicant: IBM
Inventor： DAVIS GORDON T
IPC: H04J11/00 , H04L5/06 , H04J1/00 , H04L5/02 , H04L5/14 , H04L27/26 , H04M3/00 , H04M11/00 , H04M11/06 , H04Q11/04
Abstract: Systems, methods and computer program products are provided for simultaneously transmitting data over a plurality of subscriber lines, such as twisted pair telephone wires, extending between a shared device and a respective plurality of remote devices using a symbol-based discrete multi-tone transmission scheme. A destination code within a first group of frequency bands and modulated data within a second group of frequency bands different from the first group of frequency bands, are transmitted from the shared device to the remote devices. The second group of frequency bands is selected for a subscriber line connected to a remote device having the destination code within the first group of frequency bands. A number of bits transmitted within each of the frequency bands in the second group of frequency bands for a remote device is selected during a communication handshake between the remote device and the shared device by probing a subscriber line connected to the remote device to determine data rates that can be supported by the subscriber line at each of a plurality of frequency bands.
-
公开(公告)号：CA2268360A1
公开(公告)日：2000-02-19
申请号：CA2268360
申请日：1999-04-08
Applicant: IBM
Inventor： DAVIS GORDON T
IPC: H04J11/00 , H04J1/00 , H04L5/02 , H04L5/14 , H04L27/26 , H04M3/00 , H04M11/00 , H04M11/06 , H04Q11/04
Abstract: Systems, methods and computer program products are provided for simultaneously transmitting data over a plurality of subscriber lines, such as twisted pair telephone wires, extending between a shared device and a respective plurality of remote devices using a symbol-based discrete multi-tone transmission scheme. A destination code within a first group of frequency bands and modulated data within a second group of frequency bands different from the first group of frequency bands, are transmitted from the shared device to the remote devices. The second group of frequency bands is selected for a subscriber line connected to a remote device having the destination code within the first group of frequency bands. A number of bits transmitted within each of the frequency bands in the second group of frequency bands for a remote device is selected during a communication handshake between the remote device and the shared device by probing a subscriber line connected to the remote device to determine data rates that can be supported by the subscriber line at each of a plurality of frequency bands.
-
公开(公告)号：DE68918421D1
公开(公告)日：1994-10-27
申请号：DE68918421
申请日：1989-12-13
Applicant: IBM
Inventor： DAVIS GORDON T , MANDALIA BAIJU D MANDALIA BAIJ
IPC: H04L27/22 , H04L27/227
-
-
-
-
-
-
-
-
-
Search Results
19
records
(took 0.035 seconds)
