WO1990004297A3 - Local area network modem - Google Patents

Local area network modem Download PDF

Info

Publication number
WO1990004297A3
WO1990004297A3 PCT/US1989/004514 US8904514W WO9004297A3 WO 1990004297 A3 WO1990004297 A3 WO 1990004297A3 US 8904514 W US8904514 W US 8904514W WO 9004297 A3 WO9004297 A3 WO 9004297A3
Authority
WO
WIPO (PCT)
Prior art keywords
modem
receiver
area network
local area
transmitter
Prior art date
Application number
PCT/US1989/004514
Other languages
French (fr)
Other versions
WO1990004297A2 (en
Inventor
Darrell Furlong
Original Assignee
Concord Communications Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Concord Communications Inc filed Critical Concord Communications Inc
Publication of WO1990004297A2 publication Critical patent/WO1990004297A2/en
Publication of WO1990004297A3 publication Critical patent/WO1990004297A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/2801—Broadband local area networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems

Abstract

A local area network modem which meets the stringent signalling requirements of the IEEE 802.4 standard. The modem supports loopback commands by insuring that the receiver and transmitter portions are in phase-synchronism, regardless of the distance between the modem and upper layer control circuitry. An automatic gain control circuit is included which eliminates a number of problems associated with prior designs. The modem's receiver monitors itself to automatically correct drift in phase and automatic gain control adjustment, without intervention from the upper layer. Control (AGC) circuits are particularly susceptible to noise corruption while the receiver is being synchronized. The transmitter uses only two digital signal wires to specify which of a number of functions are to be performed by the transmitter analog components.
PCT/US1989/004514 1988-10-14 1989-10-12 Local area network modem WO1990004297A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US257,858 1988-10-14
US07/257,858 US5115451A (en) 1988-10-14 1988-10-14 Local area network modem

Publications (2)

Publication Number Publication Date
WO1990004297A2 WO1990004297A2 (en) 1990-04-19
WO1990004297A3 true WO1990004297A3 (en) 1990-07-26

Family

ID=22978072

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1989/004514 WO1990004297A2 (en) 1988-10-14 1989-10-12 Local area network modem

Country Status (2)

Country Link
US (1) US5115451A (en)
WO (1) WO1990004297A2 (en)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI93914C (en) * 1993-08-27 1995-06-12 Nokia Telecommunications Oy Procedure for controlling modem connection in a disturbance situation
US6334219B1 (en) 1994-09-26 2001-12-25 Adc Telecommunications Inc. Channel selection for a hybrid fiber coax network
JPH08181688A (en) * 1994-12-26 1996-07-12 Victor Co Of Japan Ltd Time information coder-decoder, and coder and decoder
USRE42236E1 (en) 1995-02-06 2011-03-22 Adc Telecommunications, Inc. Multiuse subcarriers in multipoint-to-point communication using orthogonal frequency division multiplexing
US7280564B1 (en) 1995-02-06 2007-10-09 Adc Telecommunications, Inc. Synchronization techniques in multipoint-to-point communication using orthgonal frequency division multiplexing
US5995541A (en) * 1995-10-13 1999-11-30 Philips Electronics North America Corporation Method and apparatus for self-calibration and testing of ZPSK transmitter/receiver IC's
US5870428A (en) * 1995-12-04 1999-02-09 Motorola Inc. Method for providing remote loop back testing in a digital data system having multiple protocols
KR100189204B1 (en) * 1996-10-14 1999-06-01 김영환 Loopback apparatus in t1 network
US5953372A (en) * 1996-12-13 1999-09-14 Standard Microsystems Corporation Loopback transmission testing in a communications device
US6502138B2 (en) * 1998-09-25 2002-12-31 Intel Corporation Modem with code execution adapted to symbol rate
US6625208B2 (en) * 1998-09-25 2003-09-23 Intel Corporation Modem using batch processing of signal samples
US6374312B1 (en) * 1998-09-25 2002-04-16 Intel Corporation System for dedicating a host processor to running one of a plurality of modem programs and dedicating a DSP to running another one of the modem programs
US6490628B2 (en) * 1998-09-25 2002-12-03 Intel Corporation Modem using a digital signal processor and a signal based command set
US6661848B1 (en) 1998-09-25 2003-12-09 Intel Corporation Integrated audio and modem device
US6711205B1 (en) 1998-09-25 2004-03-23 Intel Corporation Tone detector for use in a modem
US6711206B1 (en) * 1998-09-25 2004-03-23 Intel Corporation Modem using a digital signal processor and separate transmit and receive sequencers
US6965960B2 (en) 2000-03-01 2005-11-15 Realtek Semiconductor Corporation xDSL symbol processor and method of operating same
RU2158319C1 (en) * 2000-04-25 2000-10-27 Институт металлургии и материаловедения им. А.А. Байкова РАН High-strength corrosion- and wear-resistant austenitic steel
US7245725B1 (en) 2001-05-17 2007-07-17 Cypress Semiconductor Corp. Dual processor framer
US7372928B1 (en) 2002-11-15 2008-05-13 Cypress Semiconductor Corporation Method and system of cycle slip framing in a deserializer
US8144606B1 (en) * 2007-11-15 2012-03-27 Marvell International Ltd. Interfacing messages between a host and a network
US8365237B2 (en) * 2010-01-22 2013-01-29 Selim Shlomo Rakib Method of CATV cable same-frequency time division duplex data transmission

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3731199A (en) * 1971-04-30 1973-05-01 Nippon Telegraph & Telephone Multilevel signal transmission system
US3931584A (en) * 1974-09-12 1976-01-06 Hycom Incorporated Automatic gain control
GB2034139A (en) * 1978-10-19 1980-05-29 Racal Milgo Inc Gain responsive apparatus for use in data modem
JPS5888945A (en) * 1981-11-20 1983-05-27 Ricoh Co Ltd Transceiver
JPS60200636A (en) * 1984-03-26 1985-10-11 Hitachi Ltd Phase difference absorbing and transmitting system
US4596026A (en) * 1983-05-09 1986-06-17 Raytheon Company Asynchronous data clock generator

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4425665A (en) * 1981-09-24 1984-01-10 Advanced Micro Devices, Inc. FSK Voiceband modem using digital filters
ZA83892B (en) * 1982-02-19 1983-11-30 Int Computers Ltd Data transmission systems
US4590468A (en) * 1983-03-10 1986-05-20 Western Digital Corporation Token access controller protocol and architecture
US4536874A (en) * 1983-07-21 1985-08-20 Stoffel James C Bandwidth efficient multipoint data communication system
US4691342A (en) * 1983-09-09 1987-09-01 Cts Corporation Multi-speed, full duplex modem
US4623934A (en) * 1983-11-16 1986-11-18 Rockwell International Corporation AGC update apparatus and method of using same

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3731199A (en) * 1971-04-30 1973-05-01 Nippon Telegraph & Telephone Multilevel signal transmission system
US3931584A (en) * 1974-09-12 1976-01-06 Hycom Incorporated Automatic gain control
GB2034139A (en) * 1978-10-19 1980-05-29 Racal Milgo Inc Gain responsive apparatus for use in data modem
JPS5888945A (en) * 1981-11-20 1983-05-27 Ricoh Co Ltd Transceiver
US4596026A (en) * 1983-05-09 1986-06-17 Raytheon Company Asynchronous data clock generator
JPS60200636A (en) * 1984-03-26 1985-10-11 Hitachi Ltd Phase difference absorbing and transmitting system

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Volume 10, No. 46 (E-383)(2103), 22 February 1986; & JP-A-60200636 (Hitachi), 11 October 1985 *
PATENT ABSTRACTS OF JAPAN, Volume 7, No. 186 (E-193)(1331), 16 August 1983; & JP-A-58088945 (Ricoh), 27 May 1983 *

Also Published As

Publication number Publication date
US5115451A (en) 1992-05-19
WO1990004297A2 (en) 1990-04-19

Similar Documents

Publication Publication Date Title
WO1990004297A3 (en) Local area network modem
MY110278A (en) Auxiliary video data slicer
CA2019176A1 (en) Subscriber line interface circuit in a switching system
FI844339L (en) INTEGRATED KOPPLING FOER FAERGDEKODERN AV EN TELEVISIONSMOTTAGARE.
FI870294A (en) AVSTAEMNINGSSYSTEM FOER EN TELEVISION MED AUTOMATISK FINAVSTAEMNING.
JPS57212882A (en) Receiver for television audio signal
ATE206572T1 (en) BROADCAST RECEIVER WITH DIGITAL SIGNAL PROCESSING
CA1242038A (en) Scpc communication system including a voice-activated transmission power controller
JPS5359185A (en) Remote control signal system
CA2314877A1 (en) Carrier reproduction circuit
HK117594A (en) Circuit arrangement for automatically switching over the control speed of a phase-locked loop
ES465050A1 (en) Television receiver having a demodulator circuit for demodulating a television signal modulated on a carrier
JPS5294729A (en) Hue adjustment circuit of color tv picture receiver
EP0408754A4 (en) Interframe deinterlave switching circuit
JPS54154305A (en) Tape recorder with radio receiver
FR2399172A1 (en) Demodulator switching in SECAM colour TV - is provided by gating control signal with horizontal synchronising signal
JPS57184340A (en) Switching circuit of receiver
JPS5421214A (en) Automatic clarifier adjusting system of ssb
COULTER Design of audio circuits for input-output of digital voice processors[Final Report]
JPS5539461A (en) Fm receiver
JPS54159125A (en) Correction circuit
JPS52141129A (en) Color demodulator for color tv picture receiver
JPH028242U (en)
JPS53140926A (en) Television receiver
JPS5459026A (en) Receiving device for multiplied information signal

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A2

Designated state(s): JP

AL Designated countries for regional patents

Kind code of ref document: A2

Designated state(s): AT BE CH DE FR GB IT LU NL SE

AK Designated states

Kind code of ref document: A3

Designated state(s): JP

AL Designated countries for regional patents

Kind code of ref document: A3

Designated state(s): AT BE CH DE FR GB IT LU NL SE