Abstract: A method of managing a plurality of radio links in a WLL (Wireless Local Loop) is provided. The state of each radio link are defined as L2_NewLid indicating establishment of the radio link is requested but not completed, LNK indicating that a new connection is established to the radio link, and L3_AddReq indicating establishment of the radio link is pending. A data link layer of a base station manages each radio link between a terminal and the base station referring to the state of the radio link. Upon request for establishing a radio link, the data link layer sets the LNK of the radio link to 1. Upon request for releasing the radio link, the data link layer sets the LNK of the radio link to 0. Upon request for adding a radio link, the data link layer adds the radio link by checking the L2_NewLid and the LNK of the radio link.

Abstract: Disclosed is a method for synchronizing a radio port and a radio interface unit (RIU) in a WLL system, in which an asynchronous system is used for communication among radio ports, capable of providing timing synchronization between each radio port and each RIU associated therewith. The method involves the steps of controlling a modulator equipped in the radio port to execute an internal timing alignment thereof, controlling a channel card controller equipped in the radio port to execute the timing alignment with the modulator, controlling the channel card controller to transmit the synchronous data to the radio interface unit via the modulator, controlling the radio interface unit to acquire a pilot signal transmitted from the radio port, and synchronizing the radio interface unit with the radio port associated with the acquired pilot signal based on the synchronous data received from the radio port.

Abstract: An apparatus for compensating a received signal strength (RSSI) according to temperature. An average power detector detects average power of a received signal. An RSSI compensation value detector detects an internal temperature of the RSSI compensation apparatus and detects an RSSI compensation value according to the detected temperature. An RSSI detector detects an RSSI by adding the average power to the RSSI compensation value.

Abstract: A compact optical transceiver, integrated module using a silicon optical bench is provided.

Abstract: Disclosed is a method for formatting facets of an optical waveguide element.

Abstract: The present invention discloses a bi-directional add/drop multiplexer (BADM) and a bi-directional add/drop amplifier (BADA) module which add/drop wavelength-interleaved counter-propagating signals. The mid-stage device in the BADM and the BADA module is shared by the counter-propagating signals.

Abstract: A method for processing received voice data in a voice data processing system including a receiving buffer.

Abstract: A device and method for tracking the location of a mobile telephone in multipath fading and a non-line-of-sight environment. In the device for tracking the location of a mobile telephone, each of a plurality of base stations receives a predetermined signal from the mobile telephone and calculates the distance between the mobile telephone and the base station based on the time of arrival of the signal at the base station. A location data processor receives information about the distances from the base stations, draws circles with the radii being the distances and the coordinates of the base stations at the centers thereof around the base stations, and determines the location of the mobile telephone using location tracking curves connecting the intersection points of the circles.

Abstract: There is provided a dispersion-managed fiber preform and a fabricating method thereof preform by modified chemical vapor deposition (MCVD). A core and a clad having the refractive index distribution of an optical fiber with a positive dispersion value are uniformly deposited in a glass tube. The preform with the positive dispersion value is heated at every predetermined period with a torch and the heated preform portions are etched to have a negative dispersion value. Then, the preform alternately having positions with the positive dispersion value and positions with the negative dispersion value along the length direction is collapsed.

Abstract: The inventive optical fiber ribbon includes a plurality of optical fibers horizontally arranged, upper and lower coating layers coated in upper and lower portions of the optical fibers, and side surface coating layers coated on outer surfaces of farthest optical fibers from the center of the optical fibers and having a thickness thinner than that of the upper and lower coating layers. A device of manufacturing an optical fiber ribbon is provided and includes a dye body, and a dye hole penetrating the dye body and having a cross section of a rectangular shape, characterized in that the dye hole has a height H expressed by an equation reading H=D+(0.05˜0.2 mm) (wherein D represents an external diameter of said optical fiber), and a width W expressed by an equation reading W=D×N+(0˜0.1 mm) (wherein N represents a number of cores of the optical fiber).

Abstract: A hot stamping foil comprising a heat-resistant, flexible carrier sheet of a synthetic resinous material; a release layer of a heat-resistant, flexible synthetic resinous material provided on the carrier sheet and having a lower melting point than the carrier sheet; a laninar assembly having a glass bead layer on the release layer, an aluminum layer on the glass bead layer and an adhesive layer on the aluminum layer; and wherein heat and pressure applied to the cater sheet causes the laminar assembly to be released from the release layer.

Abstract: Disclosed is an apparatus and method for sintering an over-jacketing tube in the zone sintering phase of an optical fiber preform fabrication process using a sol-gel process. The sintering apparatus includes: a processing tube; a gel tube assembly connected to a top rotation cap positioned at the top opening of the processing tube and being rotated at a predetermined rate, a ceramic pin extending downwardly from the center axis of the rotation cap, and a gel tube suspended from the bottom of the ceramic pin and suspended along the same axle of the processing tube; and a movable furnace initially positioned at the bottom of the processing tube and translating in a vertical direction along the processing tube for thermally treating the gel tube.

Abstract: Disclosed is a method for fabricating high-purity silica glass using a sol-gel processing that includes the steps of: (a) mixing deionized water with a monomer and a dimer to prepare an aqueous premix solution; (b) mixing the aqueous premix solution with a fused silica and a dispersion agent; (c) mixing the resulting mixture to form a dispersed sol; (d) aging the dispersed sol at the ambient temperature to stabilize silica particles, and removing air voids from the sol; and, (e) adding a polymerization initiator and a gelation agent to the aged sol.

Abstract: A method and apparatus are disclosed for detecting a fault in a transceiver of a base transceiver system. In the transceiver having a down converter, a microprocessor reads a predetermined first minimum value and a predetermined first maximum value of received input signal levels, measures an instantaneous control voltage generated from an automatic gain controller (AGC) and converts the measured instantaneous AGC control voltage into a received input signal level. When the converted received input signal level is below the predetermined first minimum value, the microprocessor determines that a fault exists in the amplifier operation of the down converter. Similarly, when the received input signal level exceeds the predetermined first maximum value, the microprocessor determines that a fault exists in the amplifier operation of the down converter.

Abstract: Disclosed is a device for fabricating a polarization insensitive long-period fiber grating which includes: an ultraviolet laser for irradiating a ultraviolet laser beam; an ultraviolet polarizer for converting a polarization status of the ultraviolet laser beam into a linear polarization status in parallel along the longitudinal direction of a fiber; a lens for adjusting a focus of the ultraviolet laser beam from the ultraviolet polarizer; an amplitude mask for selectively passing the ultraviolet laser beam from the lens; and, a mount for holding both ends of the fiber so that the outer circumferential surface of the fiber can be exposed to the ultraviolet laser beam from the amplitude mask.

Abstract: A method for controlling the forward calls in a cellular radio telecommunication system, comprising the steps of: reading the transmission power of the BS measured by the BTU; comparing the transmission power with a first predetermined threshold value; storing the transmission power if the transmission power is higher than the first predetermined threshold value; calculating the digital gain power by using the digital gain assigned to a call to the BS; calculating the total transmission power of the BS according to the call by adding the read transmission power to the calculated digital gain power; and, limiting the call in response to the determination of comparing the total transmission power with a second predetermined threshold value.

Abstract: A method for controlling forward power utilizing 13K erasure indicator bit in a CDMA system improves the call quality and subscriber capacity by setting a nominal_gain, a maximum traffic channel gain (max_tx_gain), a minimum traffic channel gain (min_tx_gain), and a reduction rate in an optimal combination, wherein the nominal_gain is initial gain of primary traffic channel, the max_tx_gain is maximum gain of traffic channel, the min_tx_gain is minimum gain of traffic channel, and the reduction rate represents a cycle rate to decrease the digital gain by 1 for the received frames. The nominal_gain satisfies E b N o = E c I o + P .

Abstract: An avalanche photodiode fabricating method with a simplified fabrication process and an improved reproducibility is disclosed.

Abstract: An apparatus and method for providing a music-on-hold service to an originating subscriber requesting a call connection to a busy terminating subscriber in a key telephone system, using an external music-on-hold source coupled to a previously selected central office line port of a central office line circuit to provide a pre-recorded melody.

Abstract: A method for providing information services to display the character information on terminals by a PBX through an ISDN, the method comprising the steps of registering a subscriber's request of character information services according to a given menu by connecting a specified port to the ISDN, determining whether corresponding terminal is registered for the character information services upon receiving a service message, and transferring the service message to be displayed in characters on the registered terminal.