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    12.
    发明专利
    未知

    公开(公告)号：DE2626838A1

    公开(公告)日：1976-12-23

    申请号：DE2626838

    申请日：1976-06-15

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： VINCENTIIS GIROLAMO DE ,  MELINDO FLAVIO ,  PERUCCA GIOVANNI

    IPC: G06F11/16 ,  G06F11/20 ,  H04Q3/545 ,  G06F11/00 ,  G06F3/04 ,  G06F15/16 ,  H04Q1/20 ,  H04Q3/54

    Abstract: Two processors UP1 and UP2, designed to test the operation of a pair of switching networks IN1 and IN2 in a telecommunication system through respective sets of peripheral interface units P11 etc. and P21 etc., are interconnected for parallel operation and are each linked with both sets of peripheral units via branched output and input multiples carrying outgoing and incoming messages. Each set of peripheral units is served by a respective bus bar BUS1, BUS2 connectable at one end, via an outgoing multiplexer MX12, MX22, to one of the branches of either output multiple 2, 3 and at the other end, via an incoming multiplexer MX11, MX21, to one of the branches of either input multiple 12, 13. The outgoing messages are also delivered, in parallel, to a pair of decision networks LS1, LS2 controlling the associated multiplexers MX12, MX22 in response to switching criteria obtained from a pair of intercommunicating synchronization circuits SN1, SN2 which are inserted in the two outgoing multiples upstream of their branching points. The sending of incoming messages from the peripheral units to the processors is preceded by access requests temporarily stored in parallel, under the control of a timing circuit BT, in a pair of buffer registers MT1 and MT2 respectively assigned to processors UP1 and UP2.

    13.
    发明专利
    未知

    公开(公告)号：IT1270920B

    公开(公告)日：1997-05-16

    申请号：ITTO930310

    申请日：1993-05-06

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： GHERGIA VITTORIO ,  MELINDO FLAVIO

    IPC: G02B6/42 ,  H01S5/00 ,  H01S5/022 ,  H01S5/10 ,  H01S5/187 ,  H01S

    Abstract: A semiconductor laser (21) has, on the surface of a layer (25) adjacent to the active layer (24), a grating (29) with such a period as to reflect light in a direction transverse to the active layer (24); in this way light is emitted from a face parallel to the layer. The laser can be coupled to an optical waveguide (11) realized in a substrate (12) on which the laser (21) can be fixed and which is provided with a grating (13) capable of rotating the radiation emitted by the laser (21) by the angle necessary for transferring the radiation into the waveguide.

    OPTICAL SWITCHING SYSTEM
    14.
    发明专利
    OPTICAL SWITCHING SYSTEM 未知

    公开(公告)号：CA1295040C

    公开(公告)日：1992-01-28

    申请号：CA561319

    申请日：1988-03-11

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： MELINDO FLAVIO

    IPC: H04B10/02 ,  C03C14/00 ,  C08L23/08 ,  H04L12/56 ,  H04Q3/52 ,  H04Q11/00 ,  H04Q9/00 ,  H04Q11/04

    Abstract: An optical switching system is provided in which input channels carrying packetized data are switched sequentially at a high bit rate to output channels through an optical switching network. The packets or an input channel are time compressed, and a suitable timing converted into optical signals and applied to an optical switching network to be switched to the desired output channel, in which they are reconverted into electrical signals and expanded to their original duration. A central processor controls channel switching through the switching network by means of a driving circuit.

    TELEPHONE CIRCUIT FOR RINGING RHYTHM GENERATION AND OFF HOOK DETECTION
    16.
    发明专利
    TELEPHONE CIRCUIT FOR RINGING RHYTHM GENERATION AND OFF HOOK DETECTION 未知

    公开(公告)号：CA1153838A

    公开(公告)日：1983-09-13

    申请号：CA371189

    申请日：1981-02-18

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： MELINDO FLAVIO

    IPC: H04M3/02 ,  H04M19/02

    Abstract: There is disclosed herein a telephone circuit for generating a ringing rhythm and for off-hook detection, which is able to interface a subscriber line and a subscriber line circuit under the supervision of the control units of an exchange; when these order the telephone circuit to send a ringing signal, it generates the ringing rhythm, in order to drive a relay capable of interconnecting the subscriber line and a ringing current generator, and it interrupts the ringing rhythm when, due to off-hook, the positive half-periods of the ringing current have a duration that differs in a predetermined degree from the duration of the negative half-periods.

    ELECTRONIC TELEPHONE CIRCUIT FOR SUBSCRIBER-LINE
    18.
    发明专利
    ELECTRONIC TELEPHONE CIRCUIT FOR SUBSCRIBER-LINE 未知

    公开(公告)号：CA1114084A

    公开(公告)日：1981-12-08

    申请号：CA328048

    申请日：1979-05-22

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： MELINDO FLAVIO

    IPC: H04Q3/72 ,  H04M19/00

    Abstract: A subscriber line circuit comprises two electronic circuits for supplying the subscriber set with feed current via the telephone pair, and for simulating an inductive impedance. The circuits detect current variations on the line due to signalling conditions at the subscriber set. Two hysteresis threshold comparators recognize voltage variations in the electronic circuits due to signalling conditions, and emit corresponding driving currents when the variations lie within a predetermined range. In this way, interference problems arising from the use of a common power supply for a number of subscriber sets are eliminated by relatively simple circuitry.

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