Abstract: A device or interface driver is provided for permitting an operating system to utilize, configure and control a software modem having forward compatible and expandable functionality. In a preferred embodiment, the operating system is a Windows based system running on a host processing system such as a personal computer, and the modem is compatible with standards promulgated for ADSL. Conventional voice band modem control commands are also supported, so that the present invention for ADSL based modems is nevertheless compatible with existing modem applications programs. The new driver manages control information for configuring the bandwidth to be used in a data link established through a channel with an upstream transciever during an initialization process, and serves as a data pump for the software modem. The control information may be self-determined by a user of the host processing system 398, or alternatively, automatically sensed, configured and monitored by such processing system.

Abstract: The process comprises: etching, in a semiconductor substrate (2), at least one trench (3) with predetermined width and depth; depositing, on the substrate and in the trench, a stack of successive and alternate layers of Si1−xGex (0<x≦1) and Si (5-8), the number and the thickness of which depend on the final use intended for the heterostructure; and chemical-mechanical polishing in order to obtain a final heterostructure having a plane upper main surface, level with which the stack layers deposited in the trench are flush.

Abstract: The software and hardware within a base station controller and within a mobile station are modified to redefine a flag which is used for controlling communications there between. Additionally, a new flag is created. The system with the modified flag and the new flag allow a channel which is carrying communication control information to be temporarily interrupted so that a data burst may be transmitted on the same channel. In general, the base station controller transmits to the mobile station a plurality of signals which include specified counter values and information relating to a plurality of flags. The preferred embodiment includes six flags and three counters. The flags include the Not Received flag, Received flag, Busy flag, Reserved flag, Idle flag, and Check flag. It is the functionality of the Idle flag which has been redefined. The Check flag is new. The methods for determining when to transmit a data burst are responsive to multiple combinations of the flags.

Abstract: A repeater case capable of housing HDSL telecommunications modules without an excessive buildup of heat. The repeater case has a base, an open-topped housing, and a closure member that closes the housing. The closure member is provided in the form of a pair of thermal covers that share a common construction, including heat-radiating fins formed on their respective top walls and heat transferring structures positioned on the respective interior sides of their top walls. The housing includes multiple printed circuit boards to further enhance internal air flow, each of which is protected from short circuits by an acrylic plastic barrier mounted in vertically spaced apart relation from it. The spacing between each printed circuit board and its barrier provides ample space for the connection of individual conductors from a stub cable that enters the repeater case through an opening formed in the base. The spacing also enhances the air flow within the repeater case.

Abstract: The invention provides a method of positioning an electrical control signal (S1, S1bis) for an electro-optical modulator (5) relative to the characteristic (VA, VB) of the modulator (5), in which method a disturbing signal (S2, S2bis) is superposed on the control signal (S1, S1bis) and the position of the control signal (S1, S1bis) is adjusted as a function of the value of a component in the output signal of the modulator (5) corresponding to the applied disturbance (S2, S2bis), in which method the disturbance (S2, S2bis) is superposed on the control signal (S1, S1bis) when the control signal takes a value (VA) that ought to correspond to a minimum slope point (A) of the characteristic, and the positioning of the control signal (S1, S1bis) is adjusted in such a manner as to minimize the amplitude of the disturbance as output due to said disturbance of the control signal (S1, S1bis), the method being characterized in that the characteristic of the modulator (5) includes a second minimum slope point (B) corresp

Abstract: The invention relates to a signal intended to be transmitted towards a plurality of receivers, of the type comprising at least two source signals and consisting of a plurality of independently modulated substantially orthogonal carrier frequencies distributed over a predetermined frequency band. According to the invention, said frequency band [(12)] is divided into at least two frequency sub-bands [(131-134)] each comprising a set of said substantially orthogonal carrier frequencies [(11)], and to each of said sub-bands is allocated one of said source signals, so that a receiver may retrieve from the transmitted signal, by filtration, at least one of said sub-bands and perform demodulation processing only on the carrier frequencies contained in the retrieved sub-bands. The invention also relates to a transmission process as well as to a receiver of such signal.

Abstract: A local mobile access network is equipped to manage the resources in the network which comprises a number of radio terminals (BR) linked, via the concentration stages (CTR, VCX), to another concentration stage consisting of virtual circuit switches (VCX), At least the concentration stage includes a virtual circuit switch (VCX) equipped with macrodiversity management equipment (OPM). Each concentration stage (CTR, VCX) downstream from a concentration stage (CTR, VCX) is equipped with macrodiversity management equipment (OPM) is equipped with a flow rate management device (GDM) for managing the resources on the multiplex which is found directly upstream of the concentration stage that it equips.

Abstract: An ATM switch network with an expansible optical ring, in which each switch forms several paths with a vertical ring, a horizontal ring and an expansible ring. The network has a large-capacity and a small switching interval, minimizing cell delay deviation and rendering the network suitable for high-speed multimedia service. A group switch node is formed by grouping the switches forming the vertical and horizontal rings, thereby enhancing reliability within a transmission interval by bisecting the wavelength division multiplexed logical paths and by using two optical lines. The network discriminates between I/O terminals for matching data having a low-speed small capacity and wavelength division I/O terminals for matching data having a high-speed large capacity. By using a node's I/O terminals, the network interconnects nodes via wavelength division multiplexing optical lines, thereby forming an automatic adaptive network.

Abstract: This present invention relates to a method for managing trunk status of a CDMA mobile communication exchange. A CDMA mobile communication exchange according to the present invention has the logical trunk and physical trunks relation to the trunk status, which respectively are managed in separate subsystems, and handles the physical trunks distributed and implemented in various subsystems as a single route through the use of the logical trunk structure in order to manage it in a single subsystem, such that the easy route management and route data collection are made possible. Further, the duplicate management are made for the trunk status through separate systems, which allows thus program for managing logical trunk status to collect trunk status from subsystem for managing physical trunk status and vice versa. Therefore, an effective management for the trunk status can be accomplished, and the route management and routing functions are further improved.

Abstract: A dispersion compensation device and an optical transmission system are capable of simultaneously compensating a dispersion value and dispersion slope in a single-mode optical fiber in a high-speed long-distance optical transmission system and a wavelength division optical transmission system. The dispersion compensation device includes N number of component optical fibers arranged in a serial fashion, N being a positive integer more than one, wherein each of the component optical fiber has a different dispersion value per a unit length, a dispersion slope per a unit length, and a different length.

Abstract: A conduit pipe is installed within a cable tunnel and telecommunication cables are disposed in the conduit pipe. The conduit pipe is divided longitudinally into a plurality of divided bodies. Each divided body is equipped at one longitudinal side with a retaining part and at the other longitudinal side with a protruded part. A single conduit pipe is formed when the divided bodies are connected to each other along the longitudinal side. Since the divided bodies can be wound around a small-diameter bobbin to be carried, the space for their custody is reduced and the carriage thereof is easier. Further, since connection parts on surfaces of the conduit pipes can be arranged such that they occupy empty spaces between conduit pipes, the space occupied by the connection parts can be minimized, thereby comparatively larger number of telecommunication cables being able to be disposed within the cable tunnel.

Abstract: A method of correcting topographical effects on a microelectronic substrate, the method comprising the steps consisting in depositing a layer of resin on the structure to be planarized having topography in relief surrounded by isolation zones, and subjecting said resin layer in its zones superposed on underlying zones of high topographical density to photolithography by means of a mask possessing a standard mesh without any one-to-one coincidence with the underlying topography.

Abstract: A customer premise network equipment and a data communication method based on a single ring configuration are disclosed. The equipment includes a plurality of subscriber terminals connected one-to-one or one-to-multiple or a broadcasting type between a network and a subscriber by a single ring, and a customer premise network terminal equipment connected by a single ring for receiving an one-to-one protocol and implementing a communication between the subscriber terminals and an access between the subscriber terminal and the network.

Abstract: A concurrent write duplexing device with extension of memory bus according to the present invention includes: a primary memory having a first memory in which changed information is stored and a first memory controller for controlling the first memory; a secondary memory having a second memory in which the operating system is loaded to change an operation mode from the standby module to the active module upon failure of duplexing separation and a second memory controller for controlling the second memory; a bus transceiver part for exchanging data with a CPU through a system bus and having a bus transceiver in the first memory controller and a bus transceiver in the second memory controller, to thereby determine as to whether the first and second memory controller operate; and a memory switch part for exchanging data between the active module and the standby module and having memory switches which set direction of memory bus in accordance with an operation mode of module, so that write operation performed in t

Abstract: Disclosed is a system for providing a sender certification service based on an end-to-end (EtoE) message security and public key infrastructure (PKI) between mobile terminals. The system performs by proxy a verification work of the user's certificate that is difficult to be performed by the mobile terminal having a limited capacity. The system performs by proxy a certification removal list (CRL) check and a certificate validity check with respect to the certificate sent by a sender, and thus the mobile terminal having the limited capacity can directly use the certificate without any CRC check or validity check of the sender's certificate, and effectively perform the PKI based electronic certification service. The system can be usefully applied to all fields that require a PKI based certification security service in the radio network environment in that messages are transmitted/received between the mobile terminals.

Abstract: The invention relates to a stabilized power supply device for an assembly of remotely powered electronic components, for which the supply and the data transmission take place on the same channel. The device includes an electronic module which is interposed between the supply channel and the assembly of electronic circuits, supplies the said assembly of electronic components with a variable current in order for the proper operation of the said assembly of electronic components to be satisfied, and consumes a constant current in order to allow effective data transmission.

Abstract: The semiconductor region of an intrinsic collector is surrounded with a lateral insulating region. A semi-conducting layer comprising a SiGe heterojunction is partially located between the transmitter and the intrinsic collector and extends on either side of the transmitter above the lateral insulating region. The base intrinsic region is formed in said semi-conducting layer with heterojunction between the transmitter and the intrinsic collector. The base extrinsic region and the collector extrinsic region respectively comprise first zones formed in said semi-conducting layer with heterojunction, located respectively on either side of the transmitter and above the lateral insulating region first part and mutually electrically insulated by the lateral insulating region second part.

Abstract: An application and method for analyzing a virtual circuit in an asynchronous transfer mode (“ATM”) network is disclosed. The ATM network may include multiple switches and connects two telecommunications networks through two interface devices, one for each telecommunications network. A virtual circuit is created in the ATM network between the two telecommunications networks, connecting to the first telecommunications network through a port of the first interface device and the second telecommunications network through a port of the second interface device. The method transfers a data value from the port of the first interface device to the port of the second interface device before or during a call. The data value identifies the two ports. In this way, the data value can later be examined to determine if it still identifies the two ports. By so doing, the examining interface device can determine a status of the virtual circuit.