MX9601094A - Aparato modulador-desmodulador y metodo para sincronizar un equipo de comunicaciones de datos a un reloj de una red. - Google Patents
Aparato modulador-desmodulador y metodo para sincronizar un equipo de comunicaciones de datos a un reloj de una red.Info
- Publication number
- MX9601094A MX9601094A MX9601094A MX9601094A MX9601094A MX 9601094 A MX9601094 A MX 9601094A MX 9601094 A MX9601094 A MX 9601094A MX 9601094 A MX9601094 A MX 9601094A MX 9601094 A MX9601094 A MX 9601094A
- Authority
- MX
- Mexico
- Prior art keywords
- modem
- qls
- network
- timing information
- level
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/04—Speed or phase control by synchronisation signals
- H04L7/08—Speed or phase control by synchronisation signals the synchronisation signals recurring cyclically
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0602—Systems characterised by the synchronising information used
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
- H04L25/40—Transmitting circuits; Receiving circuits
- H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
- H04L25/4917—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes
- H04L25/4927—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes using levels matched to the quantisation levels of the channel
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/04—Speed or phase control by synchronisation signals
- H04L7/041—Speed or phase control by synchronisation signals using special codes as synchronising signal
- H04L7/046—Speed or phase control by synchronisation signals using special codes as synchronising signal using a dotting sequence
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Telephonic Communication Services (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Dc Digital Transmission (AREA)
- Filters That Use Time-Delay Elements (AREA)
- Communication Control (AREA)
- Analogue/Digital Conversion (AREA)
Abstract
La presente invencion se refiere a una técnica de temporizacion para un modem de Muestreo del Nivel de Cuantificacion (QLS) que coloca la informacion de la temporizacion en una señal pulsada o pulsante, corriente abajo, transmitida desde la red telefonica conmutada publica (PSTN) en el modem de QLS. En respuesta a esta informacion de temporizacion, el modem de QLS se sincroniza con el reloj de muestreo de la red en la PSTN. En particular, la señal pulsada o pulsante incluye muestras que llevan los datos, las cuales fueron provistas por un modem de QLS del extremo alejado o remoto, y al menos una muestra que lleva los datos diferentes del usuario (NUDB), en la cual el nivel de esta muestra de NUDB se alterna periodicamente. El modem de QLS extrae la informacion de la temporizacion desde este nivel de la señal de alternamiento periodico para sincronizar el modem de QLS con el reloj de muestreo de la red.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/413,675 US5757849A (en) | 1995-03-30 | 1995-03-30 | Timing recovery in a network-synchronized modem |
Publications (1)
Publication Number | Publication Date |
---|---|
MX9601094A true MX9601094A (es) | 1997-02-28 |
Family
ID=23638174
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
MX9601094A MX9601094A (es) | 1995-03-30 | 1996-03-25 | Aparato modulador-desmodulador y metodo para sincronizar un equipo de comunicaciones de datos a un reloj de una red. |
Country Status (10)
Country | Link |
---|---|
US (1) | US5757849A (es) |
EP (1) | EP0735716B1 (es) |
JP (1) | JP3338282B2 (es) |
KR (1) | KR100380951B1 (es) |
CN (1) | CN1135129A (es) |
CA (1) | CA2170931C (es) |
DE (1) | DE69632975T2 (es) |
IL (1) | IL117649A (es) |
MX (1) | MX9601094A (es) |
TW (1) | TW289193B (es) |
Families Citing this family (33)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6233275B1 (en) | 1994-12-09 | 2001-05-15 | Brent Townshend | High speed communications system for analog subscriber connections |
ATE265120T1 (de) | 1994-12-09 | 2004-05-15 | Brent Townshend | Schnelles vermittlungssystem für analoge teilnehmeranschlüsse |
US5970103A (en) | 1996-09-06 | 1999-10-19 | Townshend; Brent | High speed communications system for analog subscriber connections |
US5864714A (en) * | 1996-04-16 | 1999-01-26 | Comsys Communication & Signal Processing Ltd. | Communication system which dynamically switches sizes of sample buffer between first size for quick response time and second size for robustness to interrupt latency |
US5917809A (en) * | 1997-01-08 | 1999-06-29 | Analog Devices, Inc. | Asymmetric digital subscriber loop modem and method |
WO1998037657A2 (en) * | 1997-02-20 | 1998-08-27 | 3Com Corp | High speed communications system for analog subscriber connections |
US6628780B2 (en) * | 1997-10-31 | 2003-09-30 | Lucent Technologies Inc. | Echo cancellation in the network for data applications |
US5887027A (en) * | 1997-12-24 | 1999-03-23 | Lucent Technologies Inc. | Method of upstream channel modeling for PCM modem |
US6201842B1 (en) * | 1997-12-29 | 2001-03-13 | Motorola Inc. | Device and method for detecting PCM upstream digital impairments in a communication network |
US6389064B1 (en) | 1999-03-08 | 2002-05-14 | International Business Machines Corporation | Modems, methods, and computer program products for identifying a signaling alphabet in variance with an ideal alphabet due to digital impairments |
US7003030B2 (en) | 1999-03-08 | 2006-02-21 | Lenovo (Singapore) Pte. Ltd. | Receivers, methods, and computer program products for an analog modem that receives data signals from a digital modem |
US6381267B1 (en) | 1999-03-08 | 2002-04-30 | International Business Machines Corporation | Modems, methods, and computer program products for falling back to a lower data rate protocol upon detecting abnormal line conditions during startup |
US6487243B1 (en) | 1999-03-08 | 2002-11-26 | International Business Machines Corporation | Modems, methods, and computer program products for recovering from errors in a tone reversal sequence between two modems |
US6661837B1 (en) | 1999-03-08 | 2003-12-09 | International Business Machines Corporation | Modems, methods, and computer program products for selecting an optimum data rate using error signals representing the difference between the output of an equalizer and the output of a slicer or detector |
US6341360B1 (en) | 1999-03-08 | 2002-01-22 | International Business Machines Corporation | Decision feedback equalizers, methods, and computer program products for detecting severe error events and preserving equalizer filter characteristics in response thereto |
US6553518B1 (en) | 1999-03-08 | 2003-04-22 | International Business Machines Corporation | Severe error detectors, methods and computer program products that use constellation specific error event thresholds to detect severe error events during demodulation of a signal comprising symbols from a plurality of symbol constellations |
US6661847B1 (en) | 1999-05-20 | 2003-12-09 | International Business Machines Corporation | Systems methods and computer program products for generating and optimizing signal constellations |
US6792004B1 (en) | 1999-10-29 | 2004-09-14 | International Business Machines Corporation | Systems, methods and computer program products for averaging learned levels in the presence of robbed-bit signaling based on proximity |
US6754258B1 (en) | 1999-10-29 | 2004-06-22 | International Business Machines Corporation | Systems, methods and computer program products for averaging learned levels in the presence of digital impairments based on patterns |
US6967995B1 (en) | 1999-10-29 | 2005-11-22 | International Business Machines Corporation | Methods, systems and computer program products for carrier drop detection using a variable threshold |
US6792040B1 (en) | 1999-10-29 | 2004-09-14 | International Business Machines Corporation | Modems having a dual power mode capability and methods of operating same |
US6823017B1 (en) | 1999-10-29 | 2004-11-23 | International Business Machines Corporation | Systems, methods and computer program products for filtering glitches from measured values in a sequence of code points |
US6662322B1 (en) | 1999-10-29 | 2003-12-09 | International Business Machines Corporation | Systems, methods, and computer program products for controlling the error rate in a communication device by adjusting the distance between signal constellation points |
US6650657B1 (en) | 1999-10-29 | 2003-11-18 | International Business Machines Corporation | Systems, methods and computer program products for identifying digital impairments in modem signals |
US6839382B1 (en) | 1999-10-29 | 2005-01-04 | International Business Machines Corporation | System, methods and computer program products for identifying digital impairments in modem signals using signature analysis and signal level comparison analysis |
US6765955B1 (en) | 1999-10-29 | 2004-07-20 | International Business Machines Corporation | Methods, systems and computer program products establishing a communication configuration for a modem connection to compensate for echo noise |
US6823004B1 (en) | 1999-10-29 | 2004-11-23 | International Business Machines Corporation | Methods, systems and computer program products for monitoring performance of a modem during a connection |
US6826157B1 (en) | 1999-10-29 | 2004-11-30 | International Business Machines Corporation | Systems, methods, and computer program products for controlling data rate reductions in a communication device by using a plurality of filters to detect short-term bursts of errors and long-term sustainable errors |
US6505222B1 (en) | 1999-10-29 | 2003-01-07 | International Business Machines Corporation | Systems methods and computer program products for controlling undesirable bias in an equalizer |
US6816545B1 (en) | 1999-10-29 | 2004-11-09 | International Business Machines Corporation | Systems, methods and computer program products for identifying digital impairments in modems based on clusters and/or skips in pulse code modulation signal levels |
US6611563B1 (en) | 1999-10-29 | 2003-08-26 | International Business Machines Corporation | Systems, methods and computer program products for data mode refinement of modem constellation points |
US6404807B1 (en) * | 2000-02-04 | 2002-06-11 | Motorola, Inc. | High speed dial-up service using PCM modem technology |
RU2542669C1 (ru) * | 2013-07-23 | 2015-02-20 | Открытое акционерное общество "Калужский научно-исследовательский институт телемеханических устройств" | Способ кодовой цикловой синхронизации блоков информации для диапазона фиксированных скоростей работы в канале связи |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3970799A (en) * | 1975-10-06 | 1976-07-20 | Bell Telephone Laboratories, Incorporated | Common control signaling extraction circuit |
JPH0614627B2 (ja) * | 1985-06-04 | 1994-02-23 | 富士通株式会社 | モデムのトレーニング方法 |
JPH0773240B2 (ja) * | 1985-12-13 | 1995-08-02 | 日本電気株式会社 | 自動再トレ−ニング方式 |
US5127051A (en) * | 1988-06-13 | 1992-06-30 | Itt Corporation | Adaptive modem for varying communication channel |
US4987569A (en) * | 1989-04-05 | 1991-01-22 | Codex Corporation | Fast training echo canceller |
US5111481A (en) * | 1989-11-17 | 1992-05-05 | Nynex Corporation | Dual mode LMS channel equalizer |
JPH04259111A (ja) * | 1991-02-13 | 1992-09-14 | Oki Electric Ind Co Ltd | 適応等化器 |
US5394437A (en) * | 1992-10-20 | 1995-02-28 | At&T Corp. | High-speed modem synchronized to a remote CODEC |
US5406583A (en) * | 1993-06-21 | 1995-04-11 | At&T Corp. | Modem with received signals and transmitted signals comprising signal sets |
KR100209877B1 (ko) * | 1994-11-26 | 1999-07-15 | 윤종용 | 복수개의 허프만부호테이블을 이용한 가변장부호화장치 및 복호화장치 |
US5463661A (en) * | 1995-02-23 | 1995-10-31 | Motorola, Inc. | TX preemphasis filter and TX power control based high speed two wire modem |
-
1995
- 1995-03-30 US US08/413,675 patent/US5757849A/en not_active Expired - Lifetime
-
1996
- 1996-03-01 TW TW085102497A patent/TW289193B/zh not_active IP Right Cessation
- 1996-03-04 CA CA002170931A patent/CA2170931C/en not_active Expired - Fee Related
- 1996-03-20 EP EP96301890A patent/EP0735716B1/en not_active Expired - Lifetime
- 1996-03-20 DE DE69632975T patent/DE69632975T2/de not_active Expired - Lifetime
- 1996-03-21 JP JP06415096A patent/JP3338282B2/ja not_active Expired - Fee Related
- 1996-03-25 MX MX9601094A patent/MX9601094A/es not_active IP Right Cessation
- 1996-03-26 IL IL11764996A patent/IL117649A/xx not_active IP Right Cessation
- 1996-03-28 CN CN96102962A patent/CN1135129A/zh active Pending
- 1996-03-30 KR KR1019960009655A patent/KR100380951B1/ko not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
CA2170931A1 (en) | 1996-10-01 |
EP0735716A3 (en) | 1999-05-26 |
JP3338282B2 (ja) | 2002-10-28 |
DE69632975D1 (de) | 2004-09-02 |
KR960036403A (ko) | 1996-10-28 |
CA2170931C (en) | 2000-10-31 |
IL117649A0 (en) | 1996-07-23 |
JPH08293819A (ja) | 1996-11-05 |
DE69632975T2 (de) | 2005-07-21 |
CN1135129A (zh) | 1996-11-06 |
EP0735716B1 (en) | 2004-07-28 |
IL117649A (en) | 2000-02-17 |
EP0735716A2 (en) | 1996-10-02 |
US5757849A (en) | 1998-05-26 |
KR100380951B1 (ko) | 2003-07-22 |
TW289193B (es) | 1996-10-21 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
FG | Grant or registration | ||
MM | Annulment or lapse due to non-payment of fees |