U.S. Philips Corporation

Ascom Tech Ag

Atecom Gmbh

Joachim J Noll

Joachim Kahlert

Klaus Peter May

Hans-Jurgen Schmitt

Vladimir Blazek

Dieter A Riekmann

Gerrit J Van Loo, Jr

Franz X Meyer

Andreas Schwope

All the information sections of a processed data structure, including pre-header, tail and extra section, header and payload, can be selectively copied in a node of a communication network by means of a copy mask (12) associated with a copy block (11). A combination of an insert block (14) and an insert mask (15) is used for selectively writing to all the information sections in the data structure. In order to increase the capacity of the data structure, the length of the pre-header or tail can be increased. In the path between an input interface (10) and the insert block (14) there is an adjustable delay block (13) into which the data structure can be copied as a whole. A microprocessor (25) is coupled to all the processing units (10)-(17) and (22)-(24) of the system and serves for presetting the two masks for selecting the information to be copied and inserted.

System for processing data structures in a node of a communication

The invention relates to a multilayer printed circuit board, in particular, for high-frequency operation, having least an outer, plane dielectric layer for accommodating interconnection paths of equal cross-section and component as well as further alternately provided metallic and dielectric layers for forming a reference earth and for the voltage supply to said interconnection paths and components via plated-through holes. In order to obtain a plane surface for the interconnection paths and predetermined areas on the printed circuit board, which areas have different characteristic impedances when interconnection paths having the same cross-section are used, at least the first metal layer comprises at least one window and the subsequent metal layer has a metal island corresponding to the area of the window, which island is connected to the reference earth via a buried plated-through hole, and the characteristic impedance of the interconnection paths is a function of the resulting thickness of the effective dielectric layers the number of which is increased in the area of the window.

Multilayer printed circuit board, in particular, for high-frequency

In the ISDN system complex line adapting circuits are provided on the two sides of the transmission line and they handle an extensive protocol. These circuits are divided into two sub-circuits connected to one another over fixed interfaces. The sub-circuit which is located nearest to the transmission line, however, is to have a considerably varying structure depending on the transmitting medium. For a modular structure it is now proposed to subdivide this sub-circuit into two partial circuits interconnected over a newly created simple binary interface. Thus, only the partial circuit which is located nearest to the transmission line needs to be specifically designed for the transmitting medium, for example, glass fibre lines, whereas the protocol management is performed in the other partial circuit, which always has the same structure irrespective of the transmitting medium. In addition, an efficient frame structure of the newly created binary interface is devised, wherein the data supplied by the other sub-circuit are converted and also the transmission error messages are processed.

Circuit arrangement for information transmission

The invention relates to an arrangement of inspecting light waveguide end faces by observing the interference pattern formed by means of measuring light in the airgap between a plane transparent plate and the end face of a light waveguide abutting on said plate. A less elaborate measuring device requiring less space is obtained in that the measuring light is led towards the end faces to be observed, via the light waveguides (1, 2, 23, 24).

Arrangement for inspecting light waveguide end faces

Growing community of inventors

Quickborn, Germany

Joachim J Noll