WO2001091442A3 - Multimode modem with automatic negotiation of operational mode - Google Patents

Multimode modem with automatic negotiation of operational mode Download PDF

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Publication number
WO2001091442A3
WO2001091442A3 PCT/US2001/014941 US0114941W WO0191442A3 WO 2001091442 A3 WO2001091442 A3 WO 2001091442A3 US 0114941 W US0114941 W US 0114941W WO 0191442 A3 WO0191442 A3 WO 0191442A3
Authority
WO
WIPO (PCT)
Prior art keywords
modem
far
operational mode
response signal
multimode
Prior art date
Application number
PCT/US2001/014941
Other languages
French (fr)
Other versions
WO2001091442A2 (en
Inventor
Frank A Costantini
Original Assignee
L 3 Comm Corp
Frank A Costantini
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 L 3 Comm Corp, Frank A Costantini filed Critical L 3 Comm Corp
Priority to AU2001259662A priority Critical patent/AU2001259662A1/en
Publication of WO2001091442A2 publication Critical patent/WO2001091442A2/en
Publication of WO2001091442A3 publication Critical patent/WO2001091442A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/1438—Negotiation of transmission parameters prior to communication

Abstract

Apparatus and methods for determining an operational mode of a far-end modem are disclosed. Where the multimode modem is a call initiator, a method according to the invention includes transmitting a V.8 ANSam tone to the far-end modem, receiving a response signal from the far-end modem, and determining from the response signal whether the far-end modem is a commercial modem or a secure modem. Where the multimode modem is a call responder, a method according to the invention includes transmitting to the far-end modem a P1800 Hz tone with phase reversals, receiving a response signal from the far-end modem, and determining from the response signal whether the far-end modem is a commercial modem or a secure modem.
PCT/US2001/014941 2000-05-23 2001-05-09 Multimode modem with automatic negotiation of operational mode WO2001091442A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001259662A AU2001259662A1 (en) 2000-05-23 2001-05-09 Multimode modem with automatic negotiation of operational mode

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/577,699 US6768771B1 (en) 2000-05-23 2000-05-23 Multimode modem with automatic negotiation of operational mode
US09/577,699 2000-05-23

Publications (2)

Publication Number Publication Date
WO2001091442A2 WO2001091442A2 (en) 2001-11-29
WO2001091442A3 true WO2001091442A3 (en) 2002-05-23

Family

ID=24309793

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2001/014941 WO2001091442A2 (en) 2000-05-23 2001-05-09 Multimode modem with automatic negotiation of operational mode

Country Status (3)

Country Link
US (2) US6768771B1 (en)
AU (1) AU2001259662A1 (en)
WO (1) WO2001091442A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10957445B2 (en) 2017-10-05 2021-03-23 Hill-Rom Services, Inc. Caregiver and staff information system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4931250A (en) * 1988-05-12 1990-06-05 Codex Corporation Multimode modem
US5349635A (en) * 1992-11-19 1994-09-20 At&T Bell Laboratories Half-duplex or full-duplex automode operation for use in data communications equipment
US5732104A (en) * 1994-12-14 1998-03-24 Motorola, Inc. Signalling techniques and device for high speed data transmission over voiceband channels

Family Cites Families (22)

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Publication number Priority date Publication date Assignee Title
US4920567A (en) 1986-07-03 1990-04-24 Motorola, Inc. Secure telephone terminal
US5003593A (en) * 1989-06-05 1991-03-26 Motorola, Inc. Teleconferencing method for a secure key management system
US5317594A (en) * 1992-01-13 1994-05-31 General Datacomm, Inc. Systems for and method of identifying V.fast modem within existing automatic interworking procedure standards
US5245560A (en) * 1992-10-22 1993-09-14 Universal Data Systems, Inc. Sequence detection method
US5341426A (en) 1992-12-15 1994-08-23 Motorola, Inc. Cryptographic key management apparatus and method
US5404394A (en) * 1993-05-24 1995-04-04 Comsat Corporation Secure communication system
US5633890A (en) 1994-02-24 1997-05-27 Ricoh Company, Ltd. Method for intelligent data terminal equipment (DTE) data communication
JP3584075B2 (en) * 1995-01-31 2004-11-04 キヤノン株式会社 Facsimile apparatus and facsimile communication method
US5847842A (en) * 1995-02-28 1998-12-08 Canon Kabushiki Kaisha Facsimile apparatus having protocol for identifying modem type
US5796808A (en) * 1997-01-09 1998-08-18 Paradyne Corporation System and method for automatically selecting the mode of communication between a plurality of modems
US5903603A (en) * 1997-01-27 1999-05-11 Motorola, Inc. Modem training apparatus and method
JPH10336419A (en) * 1997-05-30 1998-12-18 Canon Inc Facsimile equipment
US5963622A (en) * 1997-07-29 1999-10-05 3Com Corporation Mode signalling method and apparatus
US6434169B1 (en) * 1997-10-31 2002-08-13 Alcatel Canada Inc. Voiceband/modem signal relay
CA2265388A1 (en) * 1999-03-12 2000-09-12 Minacom International Inc. Method and apparatus for performing transmission line testing
US6549587B1 (en) * 1999-09-20 2003-04-15 Broadcom Corporation Voice and data exchange over a packet based network with timing recovery
US6788651B1 (en) * 1999-04-21 2004-09-07 Mindspeed Technologies, Inc. Methods and apparatus for data communications on packet networks
US6501790B1 (en) * 1999-07-09 2002-12-31 Nms Communications Corporation Method and apparatus for providing high speed modem replay using locally connecting modems
US6560321B1 (en) * 1999-09-27 2003-05-06 Conexant Systems, Inc. Method and apparatus for quick startup in a half-duplex modem system
US6757325B1 (en) * 1999-10-29 2004-06-29 International Business Machines Corporation Methods, modems and computer program products for identification of a modem type and adjustment of a communication configuration based on modem type
US7076651B2 (en) * 2000-05-01 2006-07-11 Safenet, Inc. System and method for highly secure data communications
US7126711B2 (en) * 2001-12-31 2006-10-24 Texas Instruments Incorporated Voice/facsimile/modem call discrimination method for voice over packet networks

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4931250A (en) * 1988-05-12 1990-06-05 Codex Corporation Multimode modem
US5349635A (en) * 1992-11-19 1994-09-20 At&T Bell Laboratories Half-duplex or full-duplex automode operation for use in data communications equipment
US5732104A (en) * 1994-12-14 1998-03-24 Motorola, Inc. Signalling techniques and device for high speed data transmission over voiceband channels

Also Published As

Publication number Publication date
AU2001259662A1 (en) 2001-12-03
US6768771B1 (en) 2004-07-27
WO2001091442A2 (en) 2001-11-29
US20040170222A1 (en) 2004-09-02

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