Abstract: An expandable multiplexer and method for adding additional channels per fiber in an optical communication system, the multiplexer including a wavelength multiplexer including at least two multiplexer input ports for combining a plurality of input wavelengths onto at least one multiplexer output port, and at least one wavelength filter including at least two filter input ports for combining at least two selected wavelengths onto at least one filter output port coupled to one of the multiplexer input ports.

Abstract: A high speed communications system is provided which uses a selectable, desirable portion of the total available bandwidth of a transmission channel. In a preferred embodiment, the invention is an ADSL compatible modem which selects a sub-set of the available downstream DMT sub-channels based on an evaluation of such sub-channels by appropriate signal processing circuitry. An analog front end (AFE) contains sub-band filtering causes an upstream transceiver to use only this selected number of available sub-channels for downstream data transmission. This reduces hardware costs and complexity while still preserving compatibility with applicable ADSL standards and providing a high speed data link. The target data rate of the modem can be further enhanced to the point of achieving full protocol capability by increasing or upgrading the AFEs, and/or the signal processing circuitry in order to increase the number of processable transmitted downstream sub-channels.

Abstract: A method and apparatus is disclosed for providing an interworking function to interface a frame relay LAN to an ATM network. Data from a broadband packet switched data data communications network which uses data packets of a fixed size is transferred to a narrow-band packet switched network which uses data packets of variable size by queuing input fixed length data packets data packets of variable size; processing the data payloads of said input data packets received from said queue to line-encode said data so it may be transmitted in said data packets of variable size; and generating output fixed length data packets of the same size as the input fixed-length data packets for transmitting said processed data payloads to a fixed-length to variable lengh data packets conversion device.

Abstract: A device for generating an electrical signal of a required form, preferably a sine wave suitable for a ringer, comprising an amplifier for producing an output signal of a required form, a power supply generator for supplying a power supply voltage to the amplifier, and a circuit for producing a first feedback signal to control the power supply voltage based on the output signal. Additionally, the amplifier provides comparison of a reference input signal with a second feedback signal formed from the output signal.

Abstract: An apparatus for spreading the information signals in a CDMA (Code Division Multiple Access) system supporting various information rates, and more particularly, to an apparatus for selecting a channel-separating and PN (Pseudo-random Noise) spreading method according to the rate of the symbol to spread. One channel-separating and/or PN spreading method is selected from two different spreading methods according to a condition among the symbol rate, the length of the orthogonal code, and the chip rate. One spreading method is to use an orthogonal code and the long PN code with a fixed time offset as the channel-separating and the PN spreading code, respectively. The other is to use the long code with different time offset for each channel as the channel-separating and/or PN spreading code. The spreading method gives lots of flexibility in system design and also reduces the multiple access interference among channels with a certain rate.

Abstract: A method and apparatus employing voice identification techniques to ensure only authorized users obtain remote access to a data base or computer system. Potential users dial an access number and speak to a security system using a standard telephone. The security system compares the real time voice input to a previously recorded voice print obtained from the authorized user. If the comparison scores high enough to meet a previously established criteria, the user is identified as the authorized user who submitted the previously recorded voice print and the security system then permits the user to access the data base or computer system. The present invention transmits both the users's analog and digital information along a single line to a publicly switched telephone network (PSTN), and therefore is capable of use in currently existing and common telephone lines.

Abstract: In a device for placing a structural element in a cable installation conduit in order to sub-divide it, the structural element has a width close to the size of the internal perimeter of the conduit and comprises a plate surmounted by ribs. The device comprises a hot air inlet designed to soften the plate of the structural element; an external cylinder whose diameter is identical to that of the conduit, the cylinder comprising a shaping cone at one end in order to enable the softened structural element in order to gradually take a cylindrical shape; and an internal core fixedly held at a position located in the shaping cone of the external cylinder and positioned inside the softened structural element in order to give it a constant internal diameter when it is being shaped.

Abstract: A positioner for an electronic card in a slot, the positioner including a head and at least one leg, the height of the positioner being substantially equal to the width of the slot, the leg being arranged for insertion into an aperture through the electronic card, the bottom of the leg being arranged for alignment with a reference plane of the electronic card and to contact a wall of the slot. Preferably, the positioner includes two legs for insertion into a pair of apertures in an electronic card in a slot.

Abstract: The invention concerns a directional method for a server for cells transmitted by a module attached to a local mobile area network as well as a network of this type for implementing said method. The directional method applies to a network which is comprised of a plurality of concentration stages and terminals linked to the low-level concentration stages, said network comprising servers respectively linked to concentration stages. This method is characterized therein that it consists of initially establishing permanent virtual channels in direction of the servers and, when a mobile is connected to two terminals of said network, said two terminals ascertain the closest common server and modify the header of the user cells transmitted by said mobile in such a way that they carry the identifier VPI/VCI of the channel established for said server so as to enable it to be processed there. The present invention also concerns a network provided for implementing said method.

Abstract: A method and apparatus are provided for communicating audio information over a computer network. A standard telephone connected to the public switched telephone network (PSTN) may be used to communicate with any other PSTN-connected telephone, where a computer network, such as the Internet, is the transmission facility instead of conventional telephone transmission facilities, such as the interexchange or intralata facilities. In addition to telephone-telephone communication, telephone-computer and computer-telephone communication is also possible. The originator of a conversation (calling party) dials the number of an access port for the computer network. The call is routed to a central office switching system which is connected to the PSTN and then to the access port which is a specialized computer system (ITS node).

Abstract: In a packet data transmission digital network, a data receiver node dispatches to an adjacent data sender node packets of credits containing information about its capacity to receive data packets; the sender dispatches the data packets which it needs to transmit so long as it has sufficient credits; when its credits are exhausted, it continues to dispatch, in advance, the waiting data packets and preserves each data packet sent in advance until reception thereof is confirmed by the arrival of specific packets originating from the receiver; the receiver dispatches to the sender information indicating the lost data packets; the sender retransmits the data packets whose loss has been signalled by the receiver and destroys the data packets which were sent in advance and preceding the lost data packets.

Abstract: A power on/off control device having a first power supply outputs a predetermined first electric power upon receiving input power and a second power supply outputs a main electric power to operate the computer upon power-on, which is turned on and off according to power driving signals of a first level or a second level. A power switch outputs a first level while the power switch is being pressed down, and a second level while not pressed down. A power driving signal output outputs power driving signals of the first level or of the second level alternatively according to inputted pulse signals from a microprocessor, the microprocessor has a first port connected with the power switch and a second port coupled with the power driving signal output, for controlling power on/off according to signal levels from the first port and the second port. A data output forwards data outputted from the microprocessor to a system data bus. A data input sends data inputted through the system data bus to the microprocessor.

Abstract: A space-division optical switching system comprising a multichannel acousto-optical deflector between a plurality of inlet fibers and a plurality of outlet fibers, together with both a plurality of inlet microlenses for collimating beams from the inlet fibers on the deflector and also, downstream from the deflector, a Fourier lens with the said deflector being located in the focal plane thereof, the system including a second multichannel acousto-optical deflector disposed downstream from said lens in the image focal plane thereof, together with a plurality of outlet microlenses serving to focus the beams from the second deflector on the outlet fibers.

Abstract: An output power control system prevents saturation by limiting total output power and maintaining closed loop responsiveness for a radio telephone having closed loop and open loop gain control systems. The output power control system determines when total output power exceeds an output power trigger level and automatically enters a saturation prevention mode whereby total output power is reduced through modification of a closed loop power control register. In one embodiment, an output detector and an output comparator continuously monitor output power, and in another embodiment, an analog-to-digital converter samples output power levels.

Abstract: A voice enhanced phone card which allows a caller to place a call by voice activated dialing only when the caller desires it is presented. A caller places a call using a standard calling card switch number and enters a predetermined service code. The voice enhanced phone card system recognizes the service code, and using known telephone switching capabilities, switches the call to a voice activated dialing system at a main feature point in the voice activated dialing system call flow. The call is then connected to a destination using the voice activated dialing routine.

Abstract: A communications network, eg a distributed network, comprises a plurality of distributed physical resources in the form of components, assemblies of components, and systems based on components and composites. A network management system of such a network comprises an application level which represents the functionality of a plurality of different composites being hardware and/or software components of different proprietary manufacture and different function capability, and an implementation level which implements control of the composites. The application level is sub-divided into a plurality of application level elements each of which correspond to a function capability of a composite or system, a system being a highest level of composite. The implementation level is sub-divided into a plurality of implementation level elements each of which represents a system, a composite or a component.

Abstract: Apparatus for simultaneously monitoring and controlling the wavelength of a plurality of semiconductor lasers whose wavelengths can be adjusted, the device including a wavelength filter including a wavelength division demultiplexer (WDM) arranged to receive a portion of the output power of each laser and divide the laser output between two filter outputs, a photoreceiver arranged to measure the power at each filter output, a processor arranged to selectably compute the ratio of the power at the two filter outputs for each laser, apparatus to compare the computed ratio with a predetermined reference ratio for the selected laser, and apparatus to adjust the wavelength of the selected laser in response to the comparison.

Abstract: The present invention relates to an electrooptic method of signal processing, characterized in that it comprises the steps consisting in: providing at least one semiconductor component consisting at least of a substrate (10) and of a superposed assembly comprising at least one guiding layer (14) and applying, to the guiding layer (14), optical radiation at a wavelength and at an angle of incidence chosen in such a way that said assembly has, at this wavelength and at this angle of incidence, a specific absorption peak suitable for allowing said optical radiation to be guided in the guiding layer (14) The invention also relates to a device for implementing this method, as well as the use of the latter.

Abstract: A device and method for monitoring and controlling the wavelength of a semiconductor laser having an adjustable wavelength, the device including a wavelength filter including a medium-dense wavelength division demultiplexer (WDM) arranged to receive a portion of the laser power of the laser and divide it between two filter outputs, a photoreceiver arranged to measure the output power at each filter output, a processor coupled to the photoreceivers and arranged to compute the ratio of power at the two filter outputs, apparatus to compare the computed ratio with a predetermined reference ratio, and apparatus to adjust the wavelength of the laser in response to the comparison.