Abstract: The invention relates telecommunications. It concerns in particular the cutting of optical fibre. It provides a hand tool which is generally shaped like pincers whose two legs move apart during operation, the optical fibre being fixed to each of the free ends of the legs which stretch it and press it against a rounded forming part fixed to one of the legs while a knife comes up to the forming part to start breaking the fibre by scoring it, all these operations being controlled by operating a single trigger lever. It applies to the forming of connections at the ends of the optical fibres.

Abstract: The invention is characterized by the use of electronic scanners independently controlled by a control unit, said scanners cyclically scanning in an autonomous manner the matrices of the contacts which are assigned to them and the control unit cyclically observing the scanners so that when a scanner detects the change in state of a contact, the control unit collects from said scanner the georgraphical data of this contact and causes, during a determined time the display of the number of said contact and possibly signals the category to which it belongs. This signalling can also, according to its category, be accomplished by an acoustic alarm.

Abstract: A device for detecting errors in digital transmission systems which use a line signal whose digital running total is bounded and can only take n distinct states, e.g. a high data rate digital transmission system. The error detection device comprises a synchronous up/down counter with k bistables which give, in real time, the digital running total, and an end decoder formed by logic gates and which is sensitive to the up/down counter overflowing from either of its upper or lower limit values, the number k being an integer which satisfies the inequality:2.sup.k >n.gtoreq.2.sup.k-1.

Abstract: The invention consists of providing two lubrication circuits, a main circuit for lubricating the compression chamber and the various components of the compressor when operating under load and a secondary circuit for lubricating the components disposed on the suction side when operating under no load.The invention is used in air compressors.

Abstract: The present invention concerns the transmission of information, and consists in a continuous regulator responsive to the amplitude of a pilot tone included in the signal whose level is to be regulated, including a variable-gain quadripole through which said signal is passed, an automatic gain control loop including a circuit controlling the gain of the quadripole, and an auxiliary feedback loop through which the control circuit also controls the automatic gain control loop. The regulator is applicable with advantage to transmission systems.

Abstract: A circuit permits the output voltage of an amplifier to be limited for certain ranges of its input voltage by causing the amplifier to saturate for said ranges of its input voltage by reducing the power supply.The invention is applicable, for example, to eliminating or levelling the components of a signal whose amplitude lies within a certain range, without affecting any other components.

Abstract: The invention relates to high-security time bases. A time base comprises three synchronized generators which each deliver a clock signal 2h or a synchronizing signal Sy used for synchronizing frames. Each generator includes an oscillator driven by a phase comparator which receives the three clock signals and by an internal locking circuit which receives a signal connected to the external synchronizing signal and/or a signal connected to the synchronizing signal Sy inherent to the generator, the synchronizing signal Sy being synchronized by a majority circuit which receives the synchronizing signals Sy from the three generators. Application to data processing installations and in particular to telephone exchanges.

Abstract: A circuit board is received in a cut-out in a surrounding frame. The circuit board has a peripheral ground conductor which is connected to the surrounding frame by the conductive teeth of an assembly of combs. The non-toothed spines of the combs are arranged along the margins of the surrounding frame and the teeth are inclined. They are preferably inclined in the plane of their spines. Such an assembly could be used for the amplifier of a telephone repeater assembly.

Abstract: A very high voltage generator switchable between n levels for supplying a capacitative receiver, such as the screen of a polychrome display tube, and comprising a high voltage DC power source suitable for delivering two extreme levels of voltage straddling the n DC voltage levels. The power source is connected to the receiver via at least one series assembly of transistors for each direction of conduction between the power source and the receiver; each series assembly is associated with a control channel for the transistors elaborating an image signal of the error voltage between the value of voltage at the terminals of the receiver and the required level for the operation of each assembly as a switch, at least one of the control channels also comprising a modulator in which the image signal modulates the voltage of an oscillator for the operation of the corresponding assembly as a switching and regulating circuit connected in series with the receiver.

Abstract: The present invention relates to a method of connecting optical fibers by ing a capillary tube which is flared at both ends. The capillary tube is formed so that its bore is cylindrical along at least half of its length, the fibers are inserted into the bore by vibration until their respective end faces come into contact with each other and the capillary tube is then heated to its softening point (at least at its ends) and allowed to cool to obtain a tightening of the ends of these fibers.

Abstract: A terminal is connected by a transmission link to a computer coupler. The rminal has a reader for a worker's card or badge. A number written on the badge is sent to the computer for verification and is echoed back if OK. The return number is checked against the number sent and if still OK the badge number is displayed. Communication takes place over two telephone lines which may be taken from amongst pre-existing telephone lines in a work location. Other data such as time and total hours worked may be displayed by the terminal once a badge has been verified.

Abstract: The invention relates to transmission systems and in particular to level regulators controlled by a pilot tone and used in such systems to correct variations over a period of time in the attenuation of the transmission system.The subject of the invention is a level regulator governed by a pilot tone whose gain control circuit locks in a mean position where there is a very low or zero value detected for the pilot tone. This locking is achieved by modifying the supply voltage of the error amplifier of the loop providing automatic gain control for the regulator.The invention is of particular application to cable transmission systems with repeaters.

Abstract: A millimetric wave high-pass filter is assembled from two axially-separate halves. Each half comprises a cast metal body having a channel which is divided to form two wave guides by means of a metal strip. The dimensions of the wave guides of the filter as a whole decrease towards a constriction at their centers while the strip is relatively thick at the constriction and tapers towards the ends. This configuration makes it possible to cast the filter in two halves with the body and the strip of each half being cast in a single piece. When assembled the halves meet at the level of the constriction.

Abstract: This invention relates to a method of encoding data by transitions in a binary sequence, as well as to a coder and a decoder using the method. In the method data is encoded as follows: a first value bit is encoded by a transition in the middle of the corresponding bit-time, but this transition is inhibited if there was a transition in the middle of the previous bit-time, a second value bit is encoded by a transition at the beginning of the corresponding bit-time, but this transition is shifted from the beginning to the middle of the bit-time if there was a transition in the middle of the previous bit-time.

Abstract: A series connection of n diplexers is used as a multiplexer for separating a hyperfrequency band into n + 1 sub-bands (or vice-versa). Each diplexer comprises a semi-circular inlet coupler followed by a semi-circular high-pass filter and by a semi-circular outlet coupler, the filter at each stage is dimensioned to reflect only the lowest of the sub-bands which it receives from the previous stage. The creation of unwanted parasitic modes in the reflected sub-band is avoided by so choosing the radius of the inlet coupler that the reflected sub-band lies between the frequencies at which the parasitic TE.sub.12 and TE.sub.22 modes occur. This is achieved by use of the relationship ##EQU1## WHERE V IS THE SPEED OF LIGHT, FMAX AND FMIN ARE THE UPPER AND LOWER LIMIT FREQUENCIES OF THE REFLECTED SUB-BAND AND P'.sub.12 and P'.sub.22 are the second zeros of the first and second order Bessel functions characterising the respective semi-circular TE.sub.12 and TE.sub.22 modes.

Abstract: The time-switching network according to the invention has an inlet stage, an outlet stage, and a selection switching stage, respectively comprising M, M, and N groups. It includes line equipments; each inlet stage group has a storage function, the same applying to each outlet stage group and each selection switching stage group. All inlet storages have access to each switching memory via one inlet selection multiplexer per switching group, the output of each inlet storage being multipled to one inlet of each such selector; all switching memories are accessible from each outlet storage via an access selector, the outlet of each switching memory being multiplied to one point of each outlet access selectors' field; the overall system is a full access (non-blocking) switching network.

Abstract: The invention relates to a bar for connecting optical fibres. It is characterized in that it comprises a cylindrical alinement support having a groove disposed along one of its generating lines to receive the ends of the respective fibres and a ring installed round the support, split longitudinally for the insertion of the fibres and moving in rotation to maintain them in the groove. This bar enables a data transmission link to be formed by optical fibres.

Abstract: The invention comes within the field of telephone equipment and relates in articular to the control of the blocking of a junctor in an automatic switching system. It comprises a first interface circuit followed by an antinoise device, an enabling circuit and a second interface circuit to be disposed between the signalling output of a junctor and its blocking control input. This device causes the blocking of the junctor to be delayed until this junctor is free. This device applies in particular to the control of the blocking of junctors operating in C.C.I.T.T. code 5.

Abstract: A device for multiplexing n quasi-synchronous digital trains into one digital train at least n times faster, with a rate of Fs, comprises n channel elements for synchronizing together the quasi-synchronous trains by the addition of extra bits called "justification bits", and a multiplexing element for delivery, from the synchronized trains, the multiplex train (T) (rapid) formed by successive frames. According to the invention, the multiplexing element supplies to each channel element a signal SJ constituted by a pulse Fs/n at each of the places except for the last place, provided in the train synchronized at the frame frequency of the multiplex train and by a pulse covering this latter location and maintained up to the beginning of the following frame and each channel element comprises means for ensuring, on differentiated edges of the signal SJ the insertion of justification indications, of value 1 or 0 according to whether there is or is not a request for justification in the synchronized train.

Abstract: The present invention relates to amplifier chains such as are found, for example, in carrier analog transmission by cable with repeaters. Intermodulation noise is reduced by opposing an intermodulation noise generated by a compensation source from the signal available at the chain output to the intermodulation noise generated by the chain. It applies in particular to cable transmission links with repeaters to improve the signal-to-noise ratio thereof.