Abstract:
Prior art telecommunication systems, having per cell a base station and a few repeaters, are inefficiently composed. By making use of a new cell structure, in which a cell consists of three hexagonal and equilateral sub-cells possessing one common point at the place where the base station is situated, having per sub-cell a repeater centrally situated in the sub-cell, a telecommunication system is obtained which is very efficiently composed as far as distribution in space is concerned, and by dividing a sub-cell into three equal sectors and providing it with an extra repeater, a telecommunication system is obtained which is very efficiently composed as far as time division is concerned, on account of the fact that loss of usable time slots, present due to application of a first repeater, is compensated for by application of a second repeater, in which the loss of usable time slots, present due to application of the second repeater, is compensated for by application of the first repeater. Both repeaters are in this case, for example, so-called alternating slot repeaters.
Abstract:
The invention pertains to a method of installing cables (2) in cable ducts (6) using installation devices (1; 1a, 1b, 1c) propelling the cables (2) into the ducts (6). In accordance with the invention, the installation devices (1; 1a, 1b, 1c) are powered by means of pressurized fluid, such as air, transported through the ducts (6). This results in a smaller number of compressors (4) and operators being necessary. For transporting the pressurized fluid, the duct (6) in which a cable (2) is installed and/or parallel ducts may be used. In a duct section (e.g. 6a), the feed direction of the cable (=>) may coincide with, or be opposed to, the transport direction of the fluid (}). The invention further provides installation devices (1) for use in the method.
Abstract:
The invention provides a device (1) for providing a transparent exchange of commands and data between an IC card (11) and a remote terminal (42) via a communication network (41). The device (1) acoustically couples the IC card (11) with a telephone set (43). In order to speed up the exchange of data and commands, the device (1) preferably utilizes high level commands which represent several low level card commands. However, low level commands may also be transparently passed as a special high level command. The device (1) is inexpensive but allows an efficient use of IC cards for e.g. payment and identification purposes.
Abstract:
The invention relates to a method and device for converting data packets by coding or compression (P), source data packets (11-15) being converted into transmission data packets (21-23). In order to achieve an optimal degree of filling of the transmission data packets, a data field of a transmission data packet (e.g. 21) according to the invention comprises only data of one logical channel (e.g. A). To this end, the converted data of the logical channels (A, B, ...) are separately buffered in preferably parallel buffers. Reconstruction information is not incorporated in the data fields of the transmission data packets but, if necessary, is transmitted in advance. The invention is applied, in particular, in X.25 networks.
Abstract:
The invention relates to a device (1) for processing data packets, comprising identification means (14) for identifying a data packet, processing means (11, 12) for cryptographically processing the data packet, and memory means (13) for storing information relating to the processing, in which device the processing means comprise at least a first (11) and a second (12) processing unit. Control means (14) are provided to assign, on the basis of the identification of a data packet, said data packet to one of the processing units and to process said data packet with the aid of information related to said data packet. Preferably, at least one processing unit (11; 12) is designed to encrypt or decrypt data packets, and the information relating to the processing comprises a key and a status of a processing procedure.
Abstract:
System for detecting the identifier of a component of a telecommunication system such as a terminal component, transmission component or switching component. The system comprises a detector (2) which is connected to the component (3), furthermore a remitter (4) which is connected to a second component (5). The detector dials the second component, and the telecommunication system transmits the identifier of the first component to the remitter ("calling number display" service). The remitter sends the identifier of the first component back to the detector, where the requested identifier can be read out on a display. To summarize, relatively large savings are obtained by only one operator instead of two necessary for testing; time gained in the event of malfunctions; direct and undistorted data exchange; recording of the data on a printer possible; fits into a system for guaranteeing quality; increases the performance of the telecommunication system; avoids unnecessary investment in cable/bundle/channel capacity.
Abstract:
The invention relates to a method for determining, in a transport network, a link between a source and a destination, the network being partitioned into subnetworks between which sublinks are determined, each subnetwork having access points which indicate the transport capacity of said subnetwork between the access points, the sublinks in each case extending from a first access point to a second access point. In a network having a distributed control, the sublinks are determined successively between the link already determined and a remaining subnetwork. In this arrangement, the remaining subnetwork in each case does include an access point already associated with the destination and does not include an access point already associated with the link. Preferably, the access points in each case indicate the available capacity of a subnetwork.
Abstract:
The invention relates to a system for mobile communication, comprising a mobile station (1) and a communication domain (A) with at least one base station, which communication domain (A) overlaps, at least in part, another communication domain (B) in a certain area (C), as a result of which there are available to the mobile station (1), in the said area (C), a plurality of communication domains (A, B). The system is arranged for selecting, on the basis of a preference list, an available communication domain. According to the invention, the system supports a plurality of services, a separate preference list being provided for each user and for each service supported. Preferably, the selection takes place automatically and is periodically checked.
Abstract:
A cable (5) is inserted, by way of a free end (2.1), into a tube (2) wound around a tube reel (1) which is fixed, with its winding axis (y) vertical, onto a carrier (7). The carrier with the tube reel is subjected to a periodical movement having a vertical component and a longitudinal component. The vertical component is a vertical oscillation having a period (P) and an amplitude (Av = gP /32) for an, at any rate approximately, "free-fall" movement during part of each period, preferably during half a period. The longitudinal component is an oscillating rotation around the vertical winding axis of the tube reel having the same period (P) and an amplitude (AL). The "free-fall" movement is preferably commenced when the rotational direction of the oscillating rotation is reversed and becomes backward, as opposed to the insertion direction of the cable. Three embodiments of a device are described.
Abstract:
An integrated circuit card (=ICC) with file oriented memory structure, a secure application module (=SAM) with file oriented memory structure, a system comprising a SAM and a terminal and a method for controlling service actions in a multiple service application mechanism to be carried out by the terminal on the ICC including the following steps: a) establishing whether said terminal is allowed to carry out said service action on said integrated service card by using at least one key stored both on said ICC and on said SAM and by checking on said SAM predetermined access rights stored on said SAM; and b) carrying out said service action on said integrated service card.