Abstract: Embodiments of the present invention provide a method of centering an operating band of a voltage controlled oscillator around a desired operating frequency. In one embodiment, an adjustable feedback divider provides for driving an output signal to the top and bottom of the operating band. An adjustable period divider and counter provide a plurality of count values for use in determining a mid-point of the operating band. A capacitance bank provides for selectively adjusting a capacitance of the voltage controlled oscillator, thereby adjusting the operating band.

Abstract: A PC card with a retractable antenna for use in interfacing between a communications device and a wireless network includes an interface card portion and an antenna portion, the interface card portion having a first end, and an opposite second end, the first end having an electrical interface compatible with the communications device, the second end having an opening for slidably receiving the antenna portion, the interface card portion being dimensioned to be inserted into the PC card slot of the communications device, the antenna portion being in electrical communication with the interface card portion and dimensioned to fit inside the interface card portion, the antenna portion being accessible through the opening in the interface card portion by a user, the antenna portion being configured to extend out of the cavity and retract into the cavity of the interface card portion such that when the antenna portion is retracted into the cavity the antenna portion is substantially contained inside the interface c

Abstract: A PC card with a retractable antenna for use in interfacing between a communications device and a wireless network includes an interface card portion and an antenna portion, the interface card portion having a first end, and an opposite second end, the first end having an electrical interface compatible with the communications device, the second end having an opening for slidably receiving the antenna portion, the interface card portion being dimensioned to be inserted into the PC card slot of the communications device, the antenna portion being in electrical communication with the interface card portion and dimensioned to fit inside the interface card portion, the antenna portion being accessible through the opening in the interface card portion by a user, the antenna portion being configured to extend out of the cavity and retract into the cavity of the interface card portion such that when the antenna portion is retracted into the cavity the antenna portion is substantially contained inside the interface c

Abstract: A PC card with a retractable antenna for use in interfacing between a communications device and a wireless network includes an interface card portion and an antenna portion, the interface card portion having a first end, and an opposite second end, the first end having an electrical interface compatible with the communications device, the second end having an opening for slidably receiving the antenna portion, the interface card portion being dimensioned to be inserted into the PC card slot of the communications device, the antenna portion being in electrical communication with the interface card portion and dimensioned to fit inside the interface card portion, the antenna portion being accessible through the opening in the interface card portion by a user, the antenna portion being configured to extend out of the cavity and retract into the cavity of the interface card portion such that when the antenna portion is retracted into the cavity the antenna portion is substantially contained inside the interface c

Abstract: A PC card with a retractable antenna for use in interfacing between a communications device and a wireless network includes an interface card portion and an antenna portion, the interface card portion having a first end, and an opposite second end, the first end having an electrical interface compatible with the communications device, the second end having an opening for slidably receiving the antenna portion, the interface card portion being dimensioned to be inserted into the PC card slot of the communications device, the antenna portion being in electrical communication with the interface card portion and dimensioned to fit inside the interface card portion, the antenna portion being accessible through the opening in the interface card portion by a user, the antenna portion being configured to extend out of the cavity and retract into the cavity of the interface card portion such that when the antenna portion is retracted into the cavity the antenna portion is substantially contained inside the interface c

Abstract: A method and apparatus for discerning between unknown but standardized ISDN interfaces, such as the U and S/T reference points, and automatically selecting compatible routing for the respective interface to compatible ISDN equipment. An unknown reference point supported by an ISDN service provider is interfaced with a reference adaptor comprised of an interface selection circuit which discerns the standardized form of the unknown reference point presented by the service provider and appropriately switches a relay means for routing the unknown interface reference point to ISDN equipment, either directly or indirectly through a transformation NT-1 device. Protection circuitry prevents signals from one reference interface from damaging sensitive circuitry of another reference interface.

Abstract: A method and portable ISDN interface module for interfacing both a computer or digital device having a framed data format such as HDLC with an analog telephone over integrated partitioned ISDN channels is provided. The portable ISDN interface module comprises an analog telephone interface, a controller or mechanism for generating and managing the partitioned channels of an ISDN service and an ISDN interface. The analog telephone interface receives and transmits analog information with an analog telephone or other analog device such as a fax/modem between the corresponding external devices and the ISDN interface. The controller or channel generating means implements the channelization or partitioning of the physical link between the portable ISDN interface module and the ISDN.

Abstract: An apparatus and method for facilitating interaction during a communication session between an analog modem and a terminal adapter for conveying digital alert tones and control data therebetween is provided. The embodiments provide for a collateral digital communication path between a microcontroller of an analog modem and a microcontroller of a terminal adapter for selectively relaying digital alert tones and control data therebetween. One embodiment utilizes a cellular interface of an analog modem for tapping and evaluating information for the presence of control data. Upon successful identification of control data, the microcontroller of a terminal adapter is notified and the specific control data detected in identified. By providing a method of apparatus for digitally relaying control data, accuracy of identification of control data by a terminal adapter is enhanced by foregoing needless signal transformation and retransformation.