Abstract: The present invention relates to a digital communication device comprising interconnected modules for processing and/or handling received data signals, wherein said interconnected modules each comprise means for monitoring (monitoring means) said data signal and for generating an output data signal having a predetermined signal status (squelched data signal) if said data signal is erroneous. The invention also relates to a method for processing a data signal within a communication device, preferably a communication device according to the present invention.

Abstract: Automatic control of parameters of optical components such as colored losers in a transmit side WDM system includes the following steps. At a receiver side (NE21-NE2n)) predefined characteristics of a received signal are measured. The results (MEAS) of these measurements are communicated to a remote control system (NMS1) which runs an algorithm to determine corrective adjustment parameters (ADJ) and communicates them to the transmitter side (NE11-NE1n), which adjusts the optical components accordingly. The adjustment algorithm is implemented in one of the affected network elements or in the related network management system, preferably in the element manager (NMS1) of the affected network elements. The measurements are provided automatically to the algorithm; the related adjustments are provided automatically to the network elements, which contain the transmitters to be adjusted.

Abstract: An optical cross-connect (OCX), which is designed for switching so-called optical channels of different multiplex levels with respectively defined bit rates, comprises a number of input/output ports (IO1, IO2, IO3) which are respectively adapted for transmitting and receiving communication signals of a given multiplex level. The cross-connect further comprises, for each multiplex level, a separate space switching matrix (S1, S2, S3) which is adapted to that multiplex level. The individual switching matrices (S1, S2, S3) are interconnected via multiplexers (MUX1, MUX2).

Abstract: An optical cross-connect (OCX), which is designed for the switching of so-called Optical Channels of different multiplex levels with respectively defined bit rates, has a number of input/output ports (IO1, IO2, IO3) which are respectively adapted to transmit and receive communication signals of a particular multiplex level. The cross-connect furthermore has a space switching matrix (S) which is adapted to switch communication signals of the lowest multiplex level.

Abstract: An optical cross-connect (OCX), which is designed for the switching of so-called Optical Channels of different multiplex levels with respectively defined bit rates, has a number of input/output ports (I/O) which are respectively adapted to transmit and receive communication signals of a particular multiplex level, and a switching matrix (S) which is connected to the input/output ports (I/O). The switching matrix (S) is a space switching matrix which is transparent for communication signals of all multiplex levels. In order to provide the interface between the individual multiplex levels, the cross-connect (OCX) has at least one multiplexer (MUX), which is also connected to the switching matrix (S).

Abstract: A system (SYS) for optically transmitting information, e.g., television signals, from a subcenter (HUB), e.g., a cable television head end, over a passive optical distribution network to a plurality of optical network units (ONU) includes a plurality of nodes (K1, . . . , Km) for optically transmitting further information, e.g., telephone signals, and a plurality of optical couplers (C1, C2). The further information of each node (K1, . . . , Km) is fed via a respective coupler (C1, C2) into a transmission line connected to only part of the plurality of optical network units (ONU), e.g., to only one optical network unit (ONU). Each optical network unit (ONU) is connected to a group of customer locations (END) and, for the transmission of information from this group of customer locations (END), via a further passive optical distribution network to a node (K1, . . . , Km). Each node (K1, . . . , Km,) includes means for separating the information received from the customer locations into, e.g.

Abstract: A facility (VOR) is disclosed for combining and amplifying two broadband signals which are received from different transmission networks (NET1, NET2) and are transmitted in transmission channels separated in frequency. The facility (VOR) contains a broadband amplifier (BV), a preamplifier (VV), and a frequency filter unit (FW). The preamplifier (VV) and the frequency filter unit (FW) condition the signals to be amplified and establish an optimized signal-to-noise ratio between the two combined broadband signals: The preamplifier adapts the level of one of the signals to the level of the other signal, e.g., to the same value, whereby a linear and increased amplification is achieved in the broadband amplifier, and the filtering of the signals in the frequency filter unit prevents interfering signals, e.g., noise, contained in said one signal from getting into the frequency band occupied by the other signal and vice versa when the two signals are combined.