Abstract: A data processing machine comprises a plurality of elementary machines (SUPMS, DEP, ARR, . . . ) disposed in a plurality of levels (level 1, level 2, . . .), and an event presentation device (PTA) responding to the arrival of an event by identifying the lowest machine level that is active and by identifying the elementary machine that is active in this lowest active machine level to present the event to said active elementary machine.

Abstract: An optical connection system for connecting customer premises networks to a switching center of a telecommunication network providing interactive and non-interactive services includes a switching center comprising central office termination equipments, a connection network, a control unit, an optical distribution network and customer premises networks. Non-interactive services are connected to the control central office termination equipment so that non-interactive service signals are sent to all customer premises networks on standby at the control central office termination equipment wavelength. These customer premises networks can therefore use these services without having to set up a call individually and so without having to busy a central office termination equipment for each customer premises network.

Abstract: A stack of parts, such as the stator disks of a turbomolecular pump, the parts being stacked alternately with spacers, includes a spacer having a knife-shaped deformable portion. When the stack is installed for the first time, the portion is compressed so as to take up the tolerances of the stack between abutment surfaces, e.g. delimited by a pump body and a corresponding casing. The invention applies in particular to turbomolecular pumps and aims to eliminate the operations of adjustment, re-machining, or matching that are usually required when installing a stator assembly.

Abstract: Two identical components assembled together constitute a guide rack for optical cables fixed at the bottom of a subrack fitted with circuit boards. Optical jumpers are guided between support members and guide members. Each optical cable is easily positioned pending connection with its terminal connector part resting between two support members. This avoids tangling of the optical jumpers and ensures that any of the cables connected to the front panel of any circuit board can be replaced by the cable put into the waiting position without risk of confusion.

Abstract: An automatically configurable optical connection system for connecting customer premises networks to a switching center of a telecommunication network includes an optical distribution network connecting all central office termination equipment optical senders to all customer premises network optical receivers and connecting all customer premises network optical senders to all central office termination equipment optical receivers. A control unit assigns a different wavelength to each customer premises network communicating at a given time, this wavelength representing an available central office termination equipment which is not the control central office termination equipment.

Abstract: A photonic switching matrix comprises a plurality of wavelength converters at respective inputs of the matrix to assign a wavelength to each cell applied to an input of the matrix. An optical buffer common to all the outputs of the matrix stores each cell for a duration selectable between 0 and k.T.sub.c where k is an integer and T.sub.c is the duration of cell. A space routing stage comprises a filter for each output of the matrix passing to a given output only cells having a given wavelength. The converters and the buffer are controlled according to routing information indicating for each cell the output of the matrix to which said cell is addressed and for selecting the duration for which each cell is stored in the buffer so as to construct a queue for each output to avoid conflicts between two cells to be switched to the same output presented at the same time as the input of the switching matrix. The switching matrix has applications in telecommunication networks.

Abstract: The pump comprises a stator constituted by an alternating sucession of stator plates (22) and stator rings (21) defining a sequence of compression chambers (20), and a rotor assembly comprising two shafts (24, 25) each having a compression lobe (28) in each of the compression chambers (20), with the compression lobes being placed on and fixed to their shafts during assembly of the pump, thereby enabling the axial clearance between each lobe and the adjacent stator plate to be individually adjusted, with each lobe being constituted by a body (29) and a clamping plate (30) which is fixed to the body by screws (34) which compress a set of two conical rings (32, 33), one of which (33) penetrates into the other while being compressed radially, thereby fixing the lobe in place. The assembly melthod consists in using a assembly plate (23) having a portion of extra thickness j penetrating into the stator ring over a distance corresponding to the desired clearance between the lobes and the stator plate (22).

Abstract: A system for collecting alarms from a set of stations includes a central station (SC) connected in series with the stations over a loop link includes a message loop (BM), a clock signal loop (BH), and a state control loop (BCE). Each station includes an interface (5) connected to the various loops of the link. The message loop conveys messages transmitted by the central station and intended for at least one of the interfaces, replies from the interfaces, and messages transmitted by the interfaces and intended for the central station. The clock signal loop conveys a clock signal transmitted by the central station and the state control loop conveys a state control signal also transmitted by the central station, the signal taking a first value for an active operating mode of the interfaces and a second value for a standby operating mode of the interfaces. Changing over from the first value to the second also serves to reset the interfaces to zero.

Abstract: The edge terminal pad is intended to receive a connection pin (30). It has two tinnable area solder blobs (17, 18) placed overlying each other on opposite faces of a margin of a substrate (10) at locations which are grasped by the claws (33, 34, 35) of the pin (30), with said claws forming the jaws of a resilient clamp. The tinnable area solder blob (17, 18) are notched by grooves (19, 20) at the locations of slide paths followed by the claws (33, 34, 35) while the pin (30) is being put into place. For a pin (30) having three claws with the combined width of all three claws being the same as the width of a terminal pad, one of the pad's tinnable area solder blobs (17) is generally U-shaped, while the other (18) is generally T-shaped. The advantage of the grooves is to restrict the amounts by which the clamp of the pin needs to open and to automatically center the pin on the pad, providing the pin is put into place after the tinnable areas (17, 18) have already been tinned.

Abstract: A multistage Roots-type vacuum pump comprising: a rotor defining a plurality of successive compression chambers (5) which are axially separated from one another by intermediate plates (1); a rotor assembly disposed inside the stator and constituted by two parallel shafts (8, 9) supported by bearings (11, 12) in end plates (2, 3) of the stator, each shaft (8, 9) being fitted inside each chamber (5) with a compression lobe (13, 14) such that each chamber thus contains two conjugate compression lobes; a motor (15) for driving one (8) of the two shafts in rotation, with the other shaft being driven in the opposite direction by gearing (17-18) situated in a housing (6) fixed to the corresponding end plate (2) of the stator, with each of the shafts passing through the end plate via a corresponding lip seal (19, 20); wherein a sealing module (24) is interposed between the end plate (2) situated adjacent to the housing (6) and the compression chamber adjacent to the housing, the module (24) comprising a partition aro

Abstract: The chip of semiconductor material (48) of an opto-electronic component is optically coupled inside a housing (40) to a length of optical fiber (43). This length of optical fiber (43) is fixed to the housing (40) at three points: a rear holding point (50) in the vicinity of the end of the optical fiber (43) in order to hold said end in its coupling position; a front holding point placed on the length of optical fiber (43) where it passes through the housing (tube 42) in order to withstand forces exerted on the length of optical fiber (43) from outside the housing; and an intermediate holding point (51) placed on the optical fiber between the front and rear holding points in order to attenuate the transmission to the rear holding point (50) of forces exerted on the length of optical fiber (43) at the front holding point by virtue of the housing (40) deforming.

Abstract: The machine comprises first and second screw rotors (1, 2) supported by bearings (47) in a stator casing (3) which is provided with a suction inlet and a delivery outlet, the first rotor is driven by a motor (10) and the second rotor is driven by means of synchronizing gearing (11-12) situated in a first chamber (14) of the casing and located between the motor (10) and one of the ends of the rotors, the gearing (11-12) running in a lubricating fluid (15), the machine is characterized in that the cavity (30) of the casing containing the rotors (1-2) is separated from the first chamber (14) by a first wall (16) having the shafts (8, 13) of the rotors passing therethrough via seals (17-18), in that the shafts of the rotors at the opposite ends of the rotors to the ends having the gearing pass through a second wall (20) via seals (24-25), and in that the casing (3 ) includes, beyond the second wall (20), a second chamber (31) connected to the first chamber (14) by a main pipe (29) provided with pumping means (49)

Abstract: The invention relates in particular to polarizing light whose angle of incidence may vary substantially, e.g. over .+-.10.degree.. A polarizing stack (22) constituted by dielectric layers (30, 31, 32, 33, 34, . . . ) is formed on an oblique face (4). It is in the form of a repetitive sucession of symmetrical sequences (30, 31, 40) each constituted by two half-thickness low refractive index layers (30, 40) on either side of a high refracture index layer (31). The invention is particularly applicable to polarizing the light emitted by a semiconductor laser.

Abstract: The housing comprises a tubular vessel (1) which is rigid, heat-conducting, and closed in watertight manner at both ends, with electrical circuits being received in receptacles (2) which are rigid, heat-conducting, and pressed against the inside wall of the tubular vessel by annular split springs (8) disposed transversely between the receptacles which surround them and which press against them, and which by reaction are thrust toward the tubular vessel. Thin heat-conducting cushions (5) are inserted between the vessel and the receptacles. The receptacles are hinged on supports which bear against the spring, thereby enabling heat-generating circuits to be disposed in cavities (6) whose bottom lie close to the walls (3) via which the receptacles press against the tubular vessel. The invention is applicable, in particular, to repeater type equipment for undersea communications cables.

Abstract: A current limiter circuit receiving an input current having a non-zero DC component whose value lies in a wide range of current values, and delivering a limited output current whose value lies in a narrower range of current values. The limiter comprises a series connection of a first asymmetrical conductivity element followed by a second asymmetrical conductivity element which is followed in turn by a resistive element, the series connection extending between two poles of a voltage source so that a bias current flows through the asymmetrical conductivity elements and makes them conductive. The input current is applied to the common point between the two asymmetrical conductivity elements and the current-limited output is taken from the common point between the second asymmetrical conductivity element and the resistive element.

Abstract: This automatic equalizer comprises an automatic gain control circuit (2, 4) tending to keep the peak amplitude of the equalized signal constant, together with a variable equalization network (1) provided with a control input enabling the slope of its gain transfer characteristic to be modified without altering the value of its gain at the half Baud frequency, and a servo-control system for controlling the shaping of the frequency spectrum by controlling said variable equalization network, said servo-control system including a circuit (6) for detecting the mean phase error of zero crossings in the skirts of pulses appearing in the received and equalized digital transmission signal compared with the middles of Baud intervals.

Abstract: A frame synchronization device for a synchronous digital bit stream divided into blocks by means of a block code and structured in frames comprises a frame alignment word configuration recognition circuit generating for each recognized configuration a recognition signal that is directed to a frame alignment acquisition control circuit through the intermediary of a configuration selection circuit. This circuit operates under the control of a time window definition circuit driven by a block timebase and a frame timebase and is adapted to select only recognition signals corresponding to alignment word configurations correctly placed relative to the blocks. The sorting done by the configuration selector eliminates most imitation alignment words and therefore accelerates significantly the synchronization process.

Abstract: A management unit for a unit for switching data transmitted by asynchronous time-division multiplexing. It comprises input circuits (gme, gpe) adapted to receive cells present on the input bus (BE) of the switching unit and output circuits (grs, grv) adapted to supply cells on the output bus (BS) of the switching unit. The input circuits comprise a call circuit (gpe) detecting a call signal (adl) from the switching unit and commanding the writing of the cell present on the input bus (BE) into an input memory (gme). The output circuits comprise a transmit circuit (gpl) receiving an availability signal (fv) and determining the transmission of the cell that an output register (grs, grv) contains on the output bus (BS).

Abstract: A molecular or turbomolecular type of pump comprising a stator (2) and a rotor (3) rotated by a motor (7), the stator having a first zone overlying the rotor and in which gas is admitted, and a second zone adjacent to the drive motor and cooled by a flow of fluid (8), the pump being characterized in that the first zone is provided with heater (12) for maintaining the temperature of the first zone above the condensation threshold of the gas being admitted, with the first and second zones being separated from each other by a thermal impedance element (13).

Abstract: The method enables transmission of a digital service channel by means of the parity channel of a digital bit stream transmitted in a parity checking code with parity words inserted at specific times by modifying certain parity words violating the parity checking code parity law. It consists in modifying spaced groups of even number of consecutive parity words so as not to disrupt analog detection of line errors. A digital service channel insertion circuit is included among the component parts of an MBIPIC type encoder whereby the data of a digital bit stream is transmitted by consecutive code words each formed of a block of data bits completed by a parity bit and an inversion bit.