Other

Gec Alsthom Transport Sa

Institut De Recherches De La Siderurgie Francaise (irsid)

Societe Pour L'etude Et La Fabrication De Circuits Integres Speciaux

Societe Pour L'etude Et La Fabrication Des Circuits Integres Speciaux

Centre National D'etudes De Telecommunication

Alain Y Roche

Joseph Borel

Annie Baudrant

Janine Lenoir

Maurice Romand

Eric Sahakian

Herve LeBris

Daniel J Mell

Jean-Claude Charbonnier

Olivier F Louvet

Perros Guirec

A method for making a lamination insulated by iron-manganese phosphate comprises the following operations:

Method of insulating a magnetic lamination

This process for treating surfaces of products dip-coated in a bath of molten zinc and aluminum, and intended to be phosphated, involves pickling, preceding the phosphating, with a highly alkaline solution of high pH and containing zinc in solution. The process applies chiefly to products whose coating contains a high proportion of aluminum, particularly in the case of galvanized sheet metal, which it makes easier to phosphate. It is used for painted sheet metal for motor vehicles.

Process for the chemical surface treatment of an aluminous product with

Method of fabrication of MOS transistors having electrodes of metallic

A novel MOS transistor structure comprises electrodes of metallic silicide and especially tantalum silicide. In the case of the gate electrode, the silicide is directly in contact with an insulating thin-film layer. In the case of the drain and source electrodes, the silicide is directly in contact with the monocrystalline silicon. The method of fabrication is thus simplified while avoiding the use of polycrystalline silicon.

Integrated circuit comprising MOS transistors having electrodes of

Multiplex time division switching network unit comprising a plurality of P groups of N incoming and outgoing multiplex highways and P incoming and outgoing supermultiplex highways each formed of N multiplex highways and having 2aN time slots where a is the number of time slots in a multiplex highway. The supermultiplex highways are multiplexed two by two and with themselves to form double supermultiplex highways each having 2aN time slots. It results that there exists a double supermultiplex highway simultaneously containing any time slot assigned to a calling party and any time slot assigned to a called party whatever be these time slots. The buffer stores of the switching network unit can thus be rendered bidirectional and their number is P(P+1)/2 instead of P.sup.2 in the prior art.

Multiplex time division switching network unit of the time-time type

A serial-parallel converter converts serial mode 8-bit words, delivered from a plurality of primary digital multiplx highways into parallel mode 8-bit words and multiplexes the 8-bit words to form a signal for a supermultiplex highway. The converter comprises eight parallel-write, serial-read input shift registers and seven serial-write, serial-read output shift registers. The write inputs of the output shift registers are respectively connected to the serial output of the input shift registers having the same rank. The serial read outputs of the output shift registers deliver a serial output of the eighth input shift register to the supermultiplex highway. All of the input shift registers comprise eight stages. The output shift registers have decreasing numbers of stages from 7 down to 1. The writing operation, into input shift registers, and shifting operation through all registers are controlled by a single 8-stage shift register. That single shift register circuit may also be used for demultiplexing the signals on a supermultiplex highway and converting the resulting parallel-mode 8-bit words into serial-mode 8-bit words to be delivered to outgoing primary digital multiplex highways. That single shift register circuit is particularly well-suited for time division switching systems.

Circuit for use either as a serial-parallel converter and multiplexer or

European 30-channel PCM multiplex systems and Anglo-Saxon 24-channel PCM multiplex systems are both standardized in accordance with CCITT recommendations. However they have different nominal binary rates. The connection equipment, according to this invention, provides for connecting a plurality of European PCM multiplex systems with a plurality of Anglo-Saxon PCM multiplex systems. Multiplex words are stored in parallel word memories for two-way transmission in forward and backward directions. Inside the equipment, parallel word write and read operations are performed at predetermined times, corresponding to some selected Anglo-Saxon PCM multiplex system bit times. Write and read parallel word memory addresses are determined by means of a control memory that is read in synchronism with Anglo-Saxon PCM multiplex system bit rate. More generally the equipment enables different types of PCM multiplex networks to be interconnected. That is particularly useful for providing a time-division switching center, initially designed for switching a PCM multiplex of one type, within a network using a PCM multiplex of the other type.

Equipments for connecting PCM multiplex digital transmission systems

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Ker Heul - Lannion, France

Alain Y Roche