Abstract: A process for preparing a polyarylene ether ketone comprises the following process steps: a) reaction of an aromatic dihalogen compound with a bisphenol and/or a halophenol in the presence of alkali metal and/or alkaline earth metal carbonate or hydrogencarbonate in a high-boiling aprotic solvent to give a polyarylene ether ketone, b) wet comminution and simultaneous preextraction of the solidified reaction mixture, c) extraction and filtration of the wet-comminuted product in a pressure suction filter and d) drying of the extracted product. This combination enables improved workup of the reaction mixture.

Abstract: According to the invention, in add-drop devices of an optical cross-connect device for wavelength multiplex signals, tributary drop signals to be dropped are pre-selected in the drop branch by means of pre-selection elements. Only these signals are amplified, thus reducing the number and/or power of the optical amplifiers. The tributary drop signals are individually selected by means of drop routing elements and adjustable filters. The add branch is created correspondingly.

Abstract: A cross connector for the transparent switching of optical signals is disclosed, comprising a first switching module with one or several switching modules of varying granularity, such as patch panel, wavelength groups or/and wavelengths. A second switching device is connected in series with the first switching device and comprises a polarisation multiplex switching granularity.

Abstract: A process for preparing a polyarylene ether ketone, comprising: a) reacting an aromatic dihalogen compound with a bisphenol and/or a halophenol in the presence of alkali metal carbonate and/or alkaline earth metal carbonate in a high-boiling aprotic solvent to give a polyarylene ether ketone, b) wet-comminuting the solidified reaction mixture in the presence of water, c) washing with an organic solvent, d) washing with water and e) drying the washed product, wherein the wet-comminuted reaction mixture is fed to the two-stage washing with a residual moisture content of at least 1% by weight, which process leads to distinctly reduced residual contents of salts and reaction solvents.

Abstract: A process for preparing a polyarylene ether ketone by reacting an aromatic dihalogen compound with a bisphenol in the presence of alkali metal carbonate and/or alkaline earth metal carbonate in a high-boiling solvent, where the molar mass is established by, in the course of the polycondensation, bringing the molar mass to a target value by again adding a bisphenol or an aromatic dihalogen compound to the reaction.

Abstract: A tunable add/drop&continue or drop&continue module comprises two optical filters where at least one is tunable and that are arranged following one another between a branching unit for optical signals and an insertion unit follow a branching unit for optical signals. The reflection attenuation of the one tunable optical filter is lower and the transmission attenuation higher than that of the other optical filter, as a result of which the drop&continue function of the module can be realized without high circuit-oriented expense.

Abstract: A molding compound which comprises the following components: I. 50 to 99.98 parts by weight of thermoplastic polyesters, II. 0.02 to 5 parts by weight of a copolymer which contains polysiloxane blocks and polyester blocks, III. 0 to 49.98 parts by weight of further adjuvants, selected from further polymers, fillers and pigments, antistats, reinforcing agents, and stabilizers, the sum of all the parts by weight making 100, is used for producing metallized moldings.

Abstract: The present invention provides a telecommunications system indicator and protector (10) for indicating the working status of a telecommunications line (16) and of equipment (12, 14) which can be connected to the telecommunications line. The telecommunications system indicator includes connecting means whereby the telecommunications system indicator can be connected to the telecommunications line and the equipment respectively, a line testing circuit (Block B) and an equipment testing circuit (Block A).

Abstract: According to the invention, in add-drop devices of an optical cross-connect device for wavelength multiplex signals, tributary drop signals to be dropped are pre-selected in the drop branch by means of pre-selection elements. Only these signals are amplified, thus reducing the number and/or power of the optical amplifiers. The tributary drop signals are individually selected by means of drop routing elements and adjustable filters. The add branch is created correspondingly.

Abstract: According to the invention, working signals are transmitted between network elements via a first communication path. The protection signals are transmitted continuously or in case of a fault at the same wavelength as the working signals via a second communication path of an optical network while the polarization of the protection signals is adjusted orthogonal to the polarization of additional working signals which are transmitted at the same wavelength via sections of the second communication path such that no wavelengths need to be kept clear for protection signals.

Abstract: The present invention relates to a three-dimensional powder-based production process using powders based on cyclic oligomers, and to moldings produced by this process.

Abstract: A thermoplastic polymer powder composition containing a thermoplastic polymer or a powder blend of two or more thermoplastic polymers having an average particle diameter of from 40 to 250 ?m, and from 0.01 to 10 parts of a metal powder.

Abstract: A polymer powder containing polyarylene ether ketone and having a BET surface area of from 1 to 60 m2/g is suitable for use in a layer-by-layer process in which regions of a powder layer are selectively melted via introduction of electromagnetic energy.

Abstract: An optical network node is provided having add-drop and/or cross-connect functions, wherein the optical network node includes a first optical line with a first drop branch and a first add branch, and a second optical line with a second drop branch and a second add branch, wherein the first drop branch and the second drop branch are in each case connected to a first cross-connect and to a second cross-connect, the first add branch is connected to the first cross-connect and to the second cross-connect via a first wavelength converter, and the second add branch is connected to the first cross-connect and to the second cross-connect via a second wavelength converter.

Abstract: An optical network node is provided having add-drop and/or cross-connect functions, wherein the optical network node includes a first optical line with a first drop branch and a first add branch, and a second optical line with a second drop branch and a second add branch, wherein the first drop branch and the second drop branch are in each case connected to a first cross-connect and to a second cross-connect, the first add branch is connected to the first cross-connect and to the second cross-connect via a first wavelength converter, and the second add branch is connected to the first cross-connect and to the second cross-connect via a second wavelength converter.

Abstract: In an optical plug-type connection between two optical conductors having an optical terminal which receives an optical plug-type member, an electrical connection is provided for verifying that the optical plug-type connection has been made and/or released. This verification reduces the likelihood of an optical plug-type connection being erroneously acquired in the network management system and, thus, significantly reduces problems in locating errors in the optical communication system.

Abstract: Connected into a wavelength division multiplex ring network is a filter arrangement which has a low attenuation only for the individual useful signals of the wavelength division multiplex signal and recombines these, along with launched signals to form a wavelength division multiplex signal.