3com Corporation

Kenneth S Morley

Darrin J Gibbs

Todor Cooklev

Jeffrey L Jones

Ryan A Kunz

David Moore

Gary H Stout

Mark L Gray

Graeme A Hickman

Brady V Brown

John Marshall

Scott M Christensen

Nick Thomas

Ammon E Gustafson

Dean Anthony Gratton

A master-slave switch method for reversing roles between nodes in a network environment when the traditional role reversal functionality as defined by the network specification is not implemented within the node is presented. A data terminal which does not support the traditional master-slave switch functionality, progresses as far as establishing an asynchronous connectionless (ACL) connection. The LAN access point then request a role switch, when the reversal of roles fails, the connection is aborted with device addresses of the participating entities being stored. The LAN access point then initiates the reestablishment of the connection in a master role with the data terminal assuming a slave role after verification of the device address of the LAN access point.

Wireless callback access control for a LAN network access point

An adapter mechanism for facilitating re-orientation of a plug having an original orientation that is unsuitable for a peripheral device is presented. Re-orientation of a peripheral device is possible in an embodiment by advancing a symmetrical interface to another mating position exhibiting a hospitable orientation. An adaptor maintains USB functionality while providing the ability to reorient a fixedly attached peripheral. The adaptor mechanism also allows a USB wireless peripheral device with an antenna to plug directly into the USB receptacle connector on a digital device while orienting the antenna upwards to improve the quality of the transmitted and received signals.

Connector scheme to allow physical orientation of a computer peripheral

A communication system embodying the invention has a communication channel with at least two ends, one end of the channel being connected to a transmission device with relatively limited computational capacity and an other end of the channel being connected to a computer having relatively large computational capacity. The transmission device includes a signal source node; a set of M&minus;1 delay buffers connected in series and defining a set of M progressively delayed signal nodes, M being a positive integer, one end of the series of M delay buffers being connected to the signal source node; a set of M parallel downsampling operators connected to the M progressively delayed signal nodes; and, a parallel-to-serial converter having M parallel inputs and a single serial output, the M parallel inputs being connected to the outputs of the M parallel downsampling operators and the single serial output being coupled to the one end of the communication channel. A set of M parallel filter coefficient multipliers having respective inputs and outputs and corresponding to the respective coefficients H (z ) of an anti-aliasing filter H(z)&equals;&Sgr; z H (z ) is implemented in the computer to minimize the computational requirements for the transmission device to simple tasks.

Video signal processing method and apparatus for internet appliances or embedded systems

Continuously variable slope delta modulation coding uses a thresholder having an analog input and a digital output representing the relationship between a signal amplitude at the analog input and a predetermined threshold. An integrator has an output and one input connected to the output of the thresholder and a second input that receives a step size value, the output of the integrator corresponding to a product of the thresholder output and the step size value. An adder has one input that receives an analog input signal that is to be encoded and a second input connected to the output of the integrator. The output of the adder is coupled to the analog input of the thresholder. A step size controller is responsive to an analog signal level related to the analog input signal for varying the step size value in response to variations in the analog signal level.

Method and apparatus for continuously variable slope delta modulation coding of signals

Antenna

A method and architecture for implementing link level security to enforce access privileges between a calling modem and an answering modem over a communication channel during a communication session in a modem employing a communication protocol capable of modulation modification. Security scramblers different from the standard scrambler inherent in the communication protocol are loaded into a calling modem and an answering modem. A password may alternatively be entered into the calling modem for verification prior to the enablement of the security process. During the training phase of the communication protocol, descriptors designating specific secure scramblers are passed from the calling modem to the answering modem for verification of the correct access privileges by the calling modem. The answering modem thereafter directs the calling modem to utilize yet another secure scrambler for the subsequent training and exchange of data. Since the secure scrambler modifies the modulation of each modem, incompatible scramblers are unable to properly train and therefore unable to establish a communication channel therebetween. An alternative implementation also employs scrambler hopping to provide yet further security.

Method for implementing link-level security to enforce access privileges

Growing community of inventors

Draper, UT, United States of America

Kenneth S Morley