Ke Kommunikations-elektronik Gmbh & Co.

Kabelmetal Electro Gesellschaft MIT Beschrankter Haftung

Ke Kommunications Elektronik Gmbh & Co.

Ziaedin Chahabadi

Martin Brahms

Michael Still

Christian Prenner

Jurgen Schroder

Johannes Ocker

Olaf Wittur

A system for line-conducted digital telecommunication between a switching exchange of a telecommunication network and a subscriber connected to this network is provided. The digital transmission path passes to a transfer point accessible for the subscriber, to which the subscriber may connect his devices by free choice up to the full use of the maximum available transfer rate. The activation of the particular transfer rates are controllable by the switching exchange.

System for line-conducted digital data telecommunications

A system is disclosed, which operates with active units for the line-conducted, digital transmission of communications between the exchange of a telecommunication network and subscribers connected thereto. At least one cross connector, operating with active electrical components, is connected to the exchange by a line containing at least one optical and/or electric transmission element. At least two distribution terminals, operating with active electrical components, are connected to the cross connector by a line containing at least one optical and/or electric transmission element. At least one subscriber is connected by an electrical line to the distribution terminals, which are always installed near a subscriber.

System and method for line-conducted digital communication

A process is indicated for the bidirectional transmission of digital data through a glass fiber, whereby the bits from data to be transmitted are compressed by a factor &gt;2 into bursts, in packages of equal quantities, without changing the transmission rate. The bursts in one direction of the transmission are sent by an emitter station through a glass fiber to the other station, during the pauses between the bursts in the other transmission direction. Independent external pulse generators are used at both ends of a glass fiber to determine the transmission rates of the stations. If the frequencies of the two pulse generators deviate from each other, the bursts of the data flowing at the lower transmission rate are displaced with respect to the bursts of the other flow of data, by the width of one bit of the pertinent continuous flow of data. The displacement of the bursts is communicated to the respective receiver by at least one information bit corresponding to the burst preceding the first burst to be displaced.

Process for bidirectional transmission of data

In a system wherein a main channel of data is transmitted between two stations by means of an optical waveguide, an additional optical channel may be transmitted. Bits of the additional optical channel are inserted into the main channel at a transcoder in the transmitting station in place of bits of the main channel at defined spacings, known to the transcoder of the receiving station, with a bit rate lower than that of the main channel. The inserted bits are removed from the optical main channel at the receiving station. The bits of the additional optical channel inserted into the main channel are double bits that are identical to a forbidden bit combination that results during the recoding of an electrical AMI code into an optical CMI code. In the receiving station, the double bits of the main channel replaced by the bits of the additional optical channel are recovered by using sequential logic and memory to apply the fixed rules of the electrical AMI code.

Method for the transmission of data between two stations by means of

Apparatus for bidirectional transmission of optical signals between two stations connected by a light transmission path of optical fibers, each station including a laser module comprised of a laser diode and an adjacent monitor diode, the latter performing the dual functions of detecting light emitted by such laser diode in its transmission mode, and for detecting light transmitted from the other station when such adjacent laser diode is not in its transmission mode.

Apparatus for bidirectional transmission of optical signals

A circuit is described for producing an alternating voltage in an electronic device which is remotely fed over a digital transmission path. By the pulses of a clock (8) two capacitors, C1, C2 are charged via a transistor (T1) and a transformer (10), one of them (C2) being discharged over a parallel resistor (R2). A coupling capacitor (CK) which is charged by the other capacitor (C1) is discharged alternately by the influence of the dischargeable capacitor (C2) over a transistor (T2).

Circuit for producing an alternating voltage

A circuit arrangement is disclosed by which one of two subscribers (T1, T2) can be connected to a subscriber line (ASL) of the public telecommunication network if a device (2) associated with both subscribers (T1, T2) experiences trouble. The two subscribers (T1, T2) are, in normal operation, both connected to the subscriber line (ASL). Transmission of the signals takes place in this case between the device (2) and an office of the telecommunication network digitally over the subscriber line (ASL). In the event of a disturbance, one subscriber (T1) can be connected by a bypass line (8) to the office with analog signal transfer.

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Bad Munder, Germany

Ziaedin Chahabadi