Minh Ngoc Hoang

US Patent:

6404807, Jun 11, 2002

Filed:

Feb 4, 2000

Appl. No.:

09/498105

Inventors:

Sepehr Mehrabanzad - Southborough MA
Minh Hoang - Stoughton MA

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04L 516

US Classification:

375222, 375377, 370465

Abstract:

A method and apparatus for achieving the fastest possible data transmission rate, symmetric, near symmetric, or a specific data transmission rate between multiple analog modems. The invention comprises a multimedia unit comprising of two (or more) digital modems and a controller section. The controller provides the interface between the two (or more) digital modems. When a user attempts to send data from a first analog modem to a second analog modem, the user calls the first digital modem in the network. Next, the first digital modem establishes a connection with the second digital modem through the controller section which is partitioned in two segments. Controller segments may be co-located or located in different locations and connected through either Internet or PSTN. Then, the second digital modem dials up the second analog modem under direction of the controller. Subsequently, the controller commands the digital modems to establish a connection at the fastest possible symmetric rate, near-symmetric, or any other pre-configured rate.

US Patent:

8355727, Jan 15, 2013

Filed:

Dec 19, 2007

Appl. No.:

11/960026

Inventors:

Minh Hoang - Acton MA, US
Kenneth Jones - Atkinson NH, US

Assignee:

Airvana, Corp. - Chelmsford MA

International Classification:

H04W 36/00

US Classification:

455444, 4554351, 455436, 455440, 455442, 370328, 370331, 370332, 370338

Abstract:

Techniques for facilitating a hand-in using proximity-detection and dual-pilot operation detect a presence of a client device in proximity to the network-side device; and transmit a first signal over a first communication channel to the client device, the first signal enabling the client device to access information transmitted in a second signal from the network-side device.

US Patent:

20070280481, Dec 6, 2007

Filed:

Jun 6, 2006

Appl. No.:

11/447429

Inventors:

Donald E. Eastlake - Milford MA, US
George A. Harvey - Marlborough MA, US
Minh N. Hoang - Stoughton MA, US

International Classification:

H04L 9/00

US Classification:

380277

Abstract:

A system and method of providing security in a wireless network is provided. A plurality of pre-shared keys is created. Each pre-shared key provides access to the wireless network. A list of the plurality of pre-shared keys is transmitted to an access point device in the wireless network so that the access point device can authenticate a station attempting to access the network by performing an analysis with the list of the plurality of pre-shared keys.

US Patent:

58021531, Sep 1, 1998

Filed:

Feb 28, 1996

Appl. No.:

8/607911

Inventors:

Manickam R. Sridhar - Holliston MA
Minh Hoang - Stoughton MA
John Wortman - West Roxbury MA
Timothy A. Lis - Framingham MA

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04M 1100

US Classification:

379 98

Abstract:

An apparatus (101) and method for interfacing between a processor (103) and a communications channel (105), the processor operable in data terminal equipment (102) such as a computer having a communications application program, to provide for data transmission and reception over a communications channel (105), utilizing the computer processor without additional or redundant microprocessor or digital signal processor components. The apparatus and method provide for data transfer between the interface apparatus (101 ) and the communications channel (105) at a first, determinate frequency corresponding to a specific data transmission rate. The apparatus and method provide for data transfer between the interface apparatus (101) and the processor (103) at a second, indeterminate frequency, and provides for interim data storage in memory (115) between data transmission (or data reception) and data processing, such as modulation and demodulation, by the computer processor (103). The apparatus and method further provide for generating an interrupt signal to the processor to indicate the presence of received data for processing and the absence of digital data for transmission.

US Patent:

57990646, Aug 25, 1998

Filed:

Aug 31, 1995

Appl. No.:

8/521717

Inventors:

Manickam R. Sridhar - Holliston MA
Minh Hoang - Stoughton MA
John Wortman - West Roxbury MA

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04M 1100

US Classification:

379 98

Abstract:

An apparatus (101) and method for interfacing between a processor (103) and a communications channel (105), the processor operable in data terminal equipment (102) such as a computer having a communications application program, to provide for data transmission and reception over a communications channel (105), utilizing the computer processor without additional or redundant microprocessor or digital signal processor components. The apparatus and method provide for data transfer between the interface apparatus (101) and the communications channel (105) at a first, determinate frequency corresponding to a specific data transmission rate. The apparatus and method provide for data transfer between the interface apparatus (101) and the processor (103) at a second, indeterminate frequency, and provides for interim data storage in memory (115) between data transmission (or data reception) and data processing, such as modulation and demodulation, by the computer processor (103). The apparatus and method further provide for generating an interrupt signal to the processor to indicate the presence of received data for processing and the absence of digital data for transmission.

US Patent:

51685183, Dec 1, 1992

Filed:

Oct 10, 1991

Appl. No.:

7/774335

Inventors:

Guy Criscenzo - Waltham MA
Minh Hoang - Acton MA

Assignee:

Boston Technology, Inc. - Wakefield MA

International Classification:

A04M 1702

US Classification:

379145

Abstract:

A coin tone validator (CTV) is located in a local central office and is connected between a pay telephone and a switching system. The CTV monitors DC loop current changes using opto-couplers inserted into a local loop in addition to measuring standard 1700 Hz and 2200 Hz tone frequencies generated when a coin is inserted into the paystation. A comparison of the two components, the current changes and the frequencies, is performed to determine a timing and magnitude relationship. If the frequency component is misaligned within a specified time frame or the magnitude is not sufficient, then the tones received or the current change sensed are dismissed as interference. The CTV prevents users of pay telephones from fraudulently generating coin tones that are acoustically coupled into the handset of a paystation from a calling station at any time during a call.