Abstract: The present invention discloses a cell switching network which includes a cell switch (AS) coupled to a first terminal (T1) and a function unit (FU). The cell switch is also coupled to a second and a third terminal (T2,T3) via a cell switching access network (AAN). The first terminal exchanges information with the second terminal via the function unit (FU) and a predetermined part of the information is indicative of the information exchange between the first and the second terminal. The function unit is adapted to process the information and modifies the above predetermined part of the information so that it becomes indicative of information exchange between the function unit and the third terminal. The information is thereupon exchanged between the first and the third terminal via the function unit.

Abstract: A broadband communication system (SYS), which is used to distribute television, radio and video signals, is additionally used for transmitting data signals from one subscriber (TN) to another subscriber (TN). The center (ZE) of the broadband communication system (SYS) has a service-on-demand server (SOD) which contains a control facility (CONTROL). The control facility (CONTROL) receives information transmitted by a subscriber (TN) via the return channel (R) to the center, performs a frequency conversion and transmits the information via the downstream channel (V) to all the subscribers (TN) of the broadband communication system (SYS). The information contains a source address, a destination address and the subscriber-specific data to be transmitted. Only subscribers (TN) whose address coincides with the destination address are able to interpret the information through a modem MODEM.

Abstract: A telecommunication device (11) for vehicle installation is proposed, which is equipped with an HF-transmitting and receiving device (22, 23), with different terminals and with a transmission network (19) between the HF-transmitting and receiving device and the terminals. The telecommunication-specific part of each terminal is physically separated from the actual user part (12, 13, 14) of the terminal, and installed in a central terminal control (15), which is connected with the HF-transmitting and receiving device (22). An efficient, optical transmission network (19) may be provided between the terminal control (15) and the user parts (12, 13, 14) of the terminals. Both the central terminal control (15) and the user parts (12, 13, 14) of the terminals are equipped with an interface unit for the transmission network (19). The telecommunication device (11) is less voluminous than a conventional device with individual terminals, and therefore more suitable for installation in the vehicle.

Abstract: To also offer the possibility of mobile communication to branch exchange. The task of the invention is to present an interface arrangement between a private branch exchange and one or more base stations, at low cost for large numbers of existing base stations. To that effect, a microprocessor-controlled interface that maintains the DECT-Standard is offered, which shifts the majority of the functions from the one or more base stations to the branch exchange. A particularly cost-effective solution is obtained by making multiple use of component groups and dynamic channel assignment.

Abstract: To simplify the connection protocols of an optical communication network using wavelength division multiplexing and to increase the throughput of the network, each node sends messages on a specific wavelength and associates destination labels with them. A network controller receives the messages and the labels and forwards the messages on the receive wavelength of their destination node(s). Applications include local area networks.

Abstract: Optical transmission systems in which interactive services, such as video-on-demand, are to be provided must be low in cost if the services are to find acceptance. This requires, among other things, that as little change to the structure of existing optical transmission systems as possible should be necessary.In the optical transmission system according to the invention, a first frequency-division multiplex signal (S.sub.T) is formed from subscriber-assigned video and telecommunications signals at a center (1). Cable television signals (S.sub.TV) are transmitted with light of a first wavelength, and the first frequency-division multiplex signal (S.sub.T) with light of a second wavelength, to at least one optical network termination (3). In the latter, the cable television signals (S.sub.TV) and the video signals are combined into a third frequency-division multiplex signal.

Abstract: A circuit arrangement is presented for an optical modulator with an optical modulator diode (MD) driven in the blocking direction which, in addition to a shunt resistor (RN) wired in parallel with the modulator diode, contains a damping resistor (RD) wired ahead of the modulator diode, for attenuating unwanted reflections. The damping resistor is preferably wired ahead of the parallel circuit of modulator diode and shunt resistor, and forms part of the terminal resistance of the connecting line carrying the modulation signal (U.sub.m).

Abstract: During speech recognition of words, a precise and strong detection of start/end points of the words must be ensured, even in very noisy surroundings. Use of a feature with noise-resistant properties is shown wherein for a feature vector, a function of the signal energy is formed as the first feature and a function of the quadratic difference of an LPC (Linear-Predictive-Coding) cepstrum coefficient as a second feature. A check quantity or a maximum function of a distribution function is calculated, which detects the start/end points by comparison with a threshold.

Abstract: A device (1) for correcting the amplitude/frequency characteristic of an input signal (FI), particularly from transmission cables (40), having a minimal frequency f1, a center frequency f0 and a maximal frequency f2, the input signal (FI) having an attenuation as a function of frequency characteristic that increases between f1 and f2, the correction device (1) supplying a corrected output signal (). The correction device includes two cascaded filters (41, 42), the first of the filters receiving the input signal (FI) and supplying a filtered signal (SFI) to the second of the filters, the second of the filters supplying the corrected output signal (). One of the filters is a band-stop filter (41) having a center frequency f3 less than or equal to f1, the other of the filters being a band-pass filter (42) having a center frequency f4 greater than or equal to f2. The center frequencies f3 and f4 satisfy the equation:f3.times.f4=f0.sup.

Abstract: In an open system (TN) in which the encoding and decoding of data is performed to transmit these data between system elements (VSTA, VSTX), it is proposed to enter definitions of different data types, which these data may have, into a definition dictionary. Generic functions are applied to abstract data types in a program for carrying out the encoding and decoding. When the program is running, the user-specific data are entered and their data type is determined. The definition of this data type is obtained from the definition dictionary and assigned to the abstract data types, so that the functions of the program are performed with the user-specific data. An implementation example of the method according to the invention is shown.

Abstract: To go from a coupled high level to a decoupled low level, a source unit (SU) of a transmitter (T) must be decoupled from a transmission line (TL) by a impedance unit (IU). As a result, oscillatory transition phenomena appear in the output signal and this signal possibly goes beyond a prescribed template. To avoid such overshoot problems the present transmitter (T) decreases the signal level during a decrease period before decoupling the source unit (SU) from the transmission line (TL). Therefore a source control circuit (SCC) is included in the control unit (CU) of the transmitter (T) for controlling the source level in such a way that the output signal level is decreasing.

Abstract: The problem of pulse frame synchronization occurs for example in a telecommunications system with cordless terminals operating according to the DECT standard. To establish a radio connection between base station and a cordless terminal, the base station scans its radio cell in sequence with the available ten high-frequency carriers in the DECT frame rhythm. In a multiple cell environment, the synchronization of all base stations belonging to a cordless telecommunications installation is necessary, to enable all base stations to scan the same frequency at the same time. This is achieved by blanking the DECT multi-frame synchronization pulses. The pulse gap is evaluated by error detection circuits which are present anyway, and used for the PSCN Primary receiver Scan Number-synchronization.

Abstract: A method and circuit arrangement for allowing and improving the telephone conversation among several users in digital switched telephone PCM systems, using a multiplication coefficient inversely proportional to the level of each line.

Abstract: An adaptive burst multiplexing system using dynamic deadline computation serializes data from source units. It comprises interface circuits for accumulating in a buffer memory a quantity of data from a corresponding source unit. An empty frame generator circulates a series of frames around a ring through the interface circuit. Each interface circuit computes a deadline beyond which its buffer memory may become saturated and places this deadline in a passing empty frame. When this frame returns to the frame generator it contains the identifier of the interface circuit that put in it the earliest deadline. The generator transmits an empty frame over the ring with the identifier of this interface circuit which then recognizes its authorization to transfer data accumulated in its memory.

Abstract: The invention concerns a method of forming a number of electric conductors at a very short distance from the end of depressions such as V-grooves on a substrate. In one configuration example, a film of PTFE or of a similar material is laminated over the entire surface of the substrate. Holes are etched in the film. The holes are metallized. Conductive paths are formed, which are electrically connected to the metallized holes. The film in the area of the grooves is removed by etching. In another configuration example, the grooves are temporarily filled with a photoresist and the conductive paths and contact surfaces are formed in accordance with a photolithographic method.

Abstract: A shaping method is proposed in which cells (U1-U7, 01-06) of a cell stream (CS1) are mutually delayed to obtain a shaped cell stream (CS2). For this method, a shaping delay is used which depends upon the type of the cells which are so delayed in order for consecutive user cells (U1-U2, U2-U3, . . . ) to be mutually delayed over the inverse (TU) of the peak cell rate negotiated for these user cells (U1-U7). The above method is obtained by making this shaping delay equal to the above inverse when adjacent cells are user cells (U1-U2), to a fraction (TU/3) of this inverse when the second one of these adjacent cells is an operation and maintenance or OAM cell (01-07), and to the difference between the above inverse and the number of consecutive OAM cells inbetween two user cells (U5-U6) times the above fraction, if the first one of said adjacent cells is an OAM cell (03) whilst the second one is a user cell (U6).

Abstract: The invention concerns a method of controlling an access network (AN) with a number of user ports by means of an exchange (LE) connected to the access network (AN) via an interface, as well as such an exchange (LE) and such an access network (AN). The exchange (LE) and the access network (AN) exchange user data via a number of bearer channels, and messages associated with different protocols (PSTNP, LCP, CP, BCCP) via at least one control channel. Each of the protocols (PSTNP, LCP, CP, BCCP) is formed by a set of messages for performing a specific task, and the association of a message to one of the protocols (PSTNP, LCP, CP, BCCP) is entered in the message as part thereof.

Abstract: The invention relates to a method and circuit arrangement for the realization of the Higher Path Adaptation (HPA) function in Synchronous Digital Hierarchy (SDH) equipment. Such function serves to equalize frequency difference between the synchronisms of signals coming from different nodes of the network. The equalization is carried out through the use of the positive and negative justification technique. The invention, through the alteration of the justification instants, is capable of reducing the capacity of the elastic storage and the generated wander.

Abstract: A method for frame synchronization including the detection of an n-bit pattern with predetermined characteristics in a bitstream is described. The subject method includes the steps of extracting a first set of m bits, with m being smaller than or equal to n, from a first position in said bitstream, deriving from said first set an address of a location in a first memory, deriving from the contents of said location in said first memory at least one second position in said bitstream and at least one second set of bits to be extracted therefrom until said n-bit pattern is detected in said bitstream. An apparatus for performing the subject method is additionally described.

Abstract: The optical delay unit (ODL) introduces a programmable delay of an optical signal on an optical signal path. The delay of the optical signal is realised by converting the incoming optical signal (IN) into an electrical signal, then delaying the electrical signal, using electronic devices in an electrical delay unit (ELDL), and finally converting the electrical signal into an optical signal. The electrical delay is controlled by an operator sending control data (A) via a control interface (CI) to the electrical delay unit (ELDL). A first use relates to the testing of the normal operation and/or performance of an optical network for different optical line lengths. A second use relates to the inclusion of the delay unit in an optical line emulator (OLE), wherein this optical delay unit (ODL) is coupled to an optical attenuator (ATT) which is also controlled by an operator sending control data (B) via the control interface (CI) and a power control unit (PCU).