Abstract: A terminal assembly for an optic cable equipped with terminal connectors is provided with a housing having a small through-hole and a large through-hole. A plug for keeping optical fibers within the housing to prevent the optical fibers from getting entangled with one another is mounted within the housing. Through the use of a nut member fixed to the cable, the housing is fixed to the cable. A flexible cap member for enclosing the optical fibers and the terminal connectors is combined with the housing to enclose them.

Abstract: An apparatus for recovering high speed NRZ (non-return to zero) data is disclosed. A phase-locked loop (PLL) frequency-divides the frequency which is outputted from a voltage-controlled ring oscillator, and therefore, the physical limit of the PLL is not affected. The voltage-controlled ring oscillators are installed separately from the PLL, and the voltage-controlled ring oscillators are synchronized with the PLL in the frequency only. Further, the oscillators are phase-locked to the incoming NRZ data, and two voltage-controlled ring oscillators are enabled/disabled by the binary values of the NRZ data. Therefore, a bit synchronization is realized, and thus, the voltage-controlled ring oscillators are directly controlled by the NRZ data. Consequently, the NRZ data can be recovered up to the frequency band at which the voltage-controlled ring oscillators and a D flip flop operate.

Abstract: A variable attenuator circuit provides variable attenuation responsive to received signal strength in a receiver to reduce intermodulation (IM) distortion. In a dual-mode frequency modulation/code division multiple access (FM/CDMA) cellular telephone implementation, the variable attenuator circuit decreases IM distortion by variably attenuating received radio frequency (RF) signals before an initial RF amplification stage to reduce the level of undesirable frequency mixing products. The variable attenuator circuit is turned on (activated) and off (deactivated) at a single, relatively low, input power level. An attenuator enable signal is also supplied from a logic unit of the mobile station to enable operation of the variable attenuator circuit throughout operation in a digital mode.

Abstract: The present invention relates to an optical filter for selecting a wavelength to be used in an optical communication and optical switching equipment and, more particularly, to an optical filter in order to reduce a sidelobe deteriorating its characteristics. The optical filter according to the present invention includes a plurality of pair gratings formed in a cladding layer, wherein a period of the grating pairs is constant throughout the optical filter, wherein the pair gratings are divided into two unit gratings, and wherein intervals between unit grating within pair grating are spatially different.

Abstract: Disclosed is an ultra-slim telephone set in which a plurality of circuit elements of telephone are mounted on both sides of the PCB in a multi-layer manner so as to reduce the telephone body and the handset is made earphone-typed to be hung in one of ears and can be separated/attached from/to the body with the use of the phone jack so as to make the size of the top side of the telephone be as small as a keypad, so that the telephone set can be hand-held and mobile making the user who especially may have to work with both hands have an improved work environment.

Abstract: A method for compressing a speech signal by using similarity of the F.sub.1 /F.sub.0 ratios in pitch intervals within a frame. This method comprises the steps of: dividing the speech signal into frames, each being of a predetermined size; checking whether each of the divided frames corresponds to a voiced speech; obtaining an F.sub.1 /F.sub.0 ratio of an initial pitch interval and of subsequent pitch intervals of each frame corresponding to voiced speech; determining if data in each of the subsequent pitch intervals can be regarded as identical to data in the initial pitch interval by calculating if the difference between the obtained F.sub.1 /F.sub.0 ratio corresponding to the subsequent pitch interval and the obtained F.sub.1 /F.sub.0 ratio of the initial pitch interval is smaller than a predetermined value; and compressing data in each of the subsequent pitch intervals if it can be regarded as identical to data in the initial pitch interval according the determining step above.

Abstract: A method and apparatus for scaling a wireless telecommunications network having an architecture based upon subscriber distribution includes providing a base station subsystem (BSS) and a pool of mobile switching centers (MSCs) interconnected with one another. The mobile switching centers include visitor location registers (VLRs). Lastly, a dispatcher mobile switching center (DMSC) is provided, the dispatcher mobile switching center being coupled between the base station subsystem (BSS) and the pool of mobile switching centers (MSCs) for establishing communication between the base station subsystem (BSS) and the pool of mobile switching centers (MSCs). The dispatcher mobile switching center (DMSC) further provides for distributing mobile station subscribers and call related work among the pool of mobile switching centers (MSCs).

Abstract: A system and method for initially locating and subsequently tracking the location of one or more mobile phones in a cellular communication network are disclosed. Software for implementing a scheduling and tracking system ("STS") is incorporated into the base station controller ("BSC") of a cellular communication network for performing scheduling and tracking functions with respect to mobile phone location. In one aspect of the invention, time difference of arrival ("TDOA") techniques are used to determine a location of each of a number of designated mobile phones active in the network. In another aspect of the invention, a scheduling portion of the STS originates and maintains a schedule of time measurement updates with reference to the previous location of the mobile phone. In yet another aspect of the invention, a tracking portion of the STS keeps track of the location of each of the designated mobile phones over time.

Abstract: A method for providing a closed user group service in mobile communication network. The mobile stations belonging to a certain CUG group must save the correspondence message identifier(ID) before start of service. For assigning or cancelling a message identifier to a mobile station, teleservice identifier(TI) message in a point-to-point short message is used. The mobile stations receive the cell broadcast message and compares the message ID of the received message with the saved message ID in their storage device. If the message ID of the received message is equal to the saved message ID, the mobile stations belonging to the certain group display the message information on their own display panel. If not, the mobile stations do not display.

Abstract: A system and method that uses an advanced positioning system in combination with a cellular communication network to improve the performance of the network is disclosed. The system is capable of receiving an identification number for a mobile unit as well as a location code. In order to determine if the mobile unit is a fraudulent user of the cellular communication network, the system compares the location code with a previously received location code. Since there are natural physical constraints on how quickly a mobile unit can move from one location to another, the system can thereby determine if there are two mobile units using the same identification number. If so, then one is likely a fraudulent user. In addition, the system is capable of assisting the mobile unit by providing the location code to a third party. This is especially beneficial for emergency dispatcher services since, due to the very nature of mobile units, the user of the mobile unit may not know his precise location.

Abstract: A signal transfer point distributes a plurality of messages to a plurality of service control points in accordance with a distribution plan. The distribution plan includes each of the service control points. Each of the plurality of messages from the signal transfer point is distributed to a corresponding one of the plurality of service control points in accordance with the distribution plan.

Abstract: Disclosed is a multiple feedback loop ring oscillator and delay cell with high oscillation voltage. It is an object of the present invention to implement a new ring oscillator for the VCO of a high speed PLL and a proper delay cell with a high speed and low noise. The apparatus is composed of multiple feedback loop ring oscillator that 4 delay cells which have the first main input stage, the second main input stage, the first subsidiary input stage, the second subsidiary input stage, the third subsidiary input stage, the forth subsidiary input stage, the first output stage and the second output stage is connected to the main loop and subsidiary loop. The present invention has advantages that it can be operated in high speed, it has a low power sensitivity, there is no power noise because there is no variation of a supply current and it can improve noise characteristics.

Abstract: A circuit for optimizing the bit and energy configurations of data sub-channels in a multi-channel data transmission signal is disclosed. The circuit preferably includes a high speed memory coupled to a digital signal processor running an executable routine for analyzing sub-channel signal-to-noise characteristics, determining theoretical bit capacity loadings, evaluating power performance margins, and optimizing sub-channel configurations based on a series of iterative calculations intended to maximize the overall system power performance margin for any given target data rate. The circuit keeps track of the number of non-zero bit sub-channels (N.sub.CH) from iteration to iteration, which results in a more accurate loading of the sub-channels.

Abstract: The present invention relates to a multiplexer and/or demultiplexer optical component of the waveguide array spectrograph type, wherein the waveguides are numbered in order of increasing optical path length, the optical path lengths of the waveguides describing a function of waveguide number which varies about a mean linear function, a difference measured between said waveguide number function and said mean linear function describing a difference function not limited to a set of two linear functions, said difference function being suitable for giving the optical component a spectral response that is square in shape.

Abstract: An optical amplifier for amplifying signal lights propagating in two opposite directions comprises a 1st and a 2nd transmitters for generating a 1st and a 2nd signal lights, respectively, a 1st and a 2nd receivers for receiving the 1st and the 2nd signal lights, respectively, a fiber amplifier for amplifying the signal lights, a 1st optical device including a 1st and a 2nd wavelength division multiplexing(WDM) couplers, a 1st and a 2nd isolators, a 2nd optical device including a 3rd and a 4th WDM couplers, a 3rd and a 4th isolators and a pair of light sources for pumping the fiber amplifier. In the optical amplifier, the 1st WDM coupler selectively transmits the 1st signal light from the 1st transmitter to the fiber amplifier via the 1st isolator and the 2nd WDM coupler, and the 2nd WDM coupler selectively transmits the 2nd signal light from the 2nd transmitter to the 2nd receiver via the 2nd isolator and the 1st WDM coupler.

Abstract: A system and method is described herein which provides an originating telecommunications unit with the geographic location of a mobile telecommunications unit without actually placing a call to, or receiving a call from, the mobile unit. The originating unit provides a service platform with an authorization code and the telephone number, or other identification, of the mobile unit to be located. The service platform then initiates a location program which uses various geographic location methods to provide the originating unit with the location of the mobile unit, without the user of the mobile unit becoming aware that the location of the mobile unit is being determined.

Abstract: Process for making preforms for multicore optical fibers. According to this process, several elementary preforms are made, a first machining is performed on them such that a chosen geometric model will be obtained after they are assembled, a second machining is performed such that the assembly (11) has at least one hole (12), the preforms are assembled and an induction furnace (18) is used to fuse the preforms, while creating a vacuum in each hole.

Abstract: A call forwarding automation feature in a wireless telephone provides automated activation and deactivation of conventional carrier system call forwarding. The wireless telephone provides for storing multiple call forwarding telephone numbers, selecting a call forwarding telephone number based upon location information, automatically activating call forwarding to the selected telephone number during a wireless telephone power down sequence, and automatically deactivating the call forwarding during a wireless telephone power up sequence. Programming is also provided for configuring and enabling the call forwarding feature. In another embodiment, the wireless telephone automatically prompts the user for activation of call forwarding each time the user powers down the wireless telephone. The process also provides the user an ability to select from a list of stored call forwarding telephone numbers to use, as well as providing the user an ability to manually input a new telephone number.

Abstract: A high speed modem is provided which uses a selectable, desirable portion of the total available bandwidth of a transmission channel. In a preferred embodiment, the invention is incorporated in a dedicated hardware circuit which is connected on one end to a data processor and on the other end to an upstream transceiver through a channel supporting an Asymmetric Digital Subscriber Loop (ADSL) standard. The achievable target data rate of the modem is based on the capabilities of an analog front end (AFE) used in the modem, and a signal processor within the dedicated hardware. In particular, the modem AFE contains subband filtering which causes an upstream transceiver to use only a selected number of available sub-channels for downstream data transmission. The data rate of the modem is increased by upgrading the AFE or the signal processor in order to increase the number of processable transmitted downstream sub-channels.

Abstract: The present invention relates to an apparatus for tilting a keyboard of portable computer, in a manner that a rear end of the keyboard is raised up to a predetermined height by opening its cover, so that the user can operate keys of the keyboard more conveniently. The apparatus for tilting the keyboard of a portable computer of the invention can radiate heat generated from various electric components on a main PCB of a base, during operating the computer, through a ventilation space formed between a keyboard cage on the top side of the base and a bottom side of the keyboard when opening the cover. The apparatus in accordance with the present invention comprises: a keyboard of which both sides of a front portion are rotatably joined by hinge means to a front portion of a keyboard cage formed on a base. A cover is rotably engaged with the base by hinge means mounted within an interior of a rear side portion of the base to be engaged with at least a protruding member of the cover.