An ATM network accommodates terminals having the version UNI 3.0 of signalling software installed and terminals having the version UNI 3.1 of the signalling software installed. A signalling device, when receiving a signalling message directed from a version UNI 3.0 terminal to a version UNI 3.1 terminal, translates the message created by the version UNI 3.0 signalling software into a format that the version UNI 3.1 signalling software can process, then sends it the version UNI 3.1 terminal.

For control of connections in cellular telecommunication systems, particularly setting up and releasing of connections, it is checked whether a radio resource control (RRC) connection is already active during setting up of anew mobility management (MM) connection. If an RRC connection is already active, explicit signaling is used. Otherwise, RRC level events can be used to implicitly control MM level events. During releasing of MM connections, it is checked if another MM protocol uses RRC connec...

The perceptibility of degradations caused to signals transmitted over a transmission medium is measured by generating one or more predetermined transmission degradation conditions (e.sub.t) and subjecting a test signal (S.sub.t) to the transmission degradation conditions (e.sub.t) in a network simulation device. The degree M(e) to which the or each transmission degradation condition (e.sub.t) is perceptible to the human perceptual system is measured and a data set is generated and stored for con...

A signalling system includes first and second signalling devices. The first signalling device including a retro-reflector modulator, having a lens, a modulator and a reflector, and being operable to receive, modulate and reflect the modulated signal back to the second signalling device. The second signalling device including a signal generator, a receiver for receiving the modulated signal from the first signalling device and a processor for retrieving modulation data from the received modulated...

A connector assembly for supplying power and transmitting signals from a vehicle to a towed trailer or other towed equipment. The connector assembly comprises a trailer hitch having a cross tube extending horizontally behind the vehicle. The cross tube has a wall separating an inside cavity from an outside surface of the cross tube. A first connector attached to the outside surface or mounted in a first opening in the wall of the cross tube has a connecting portion outwardly of the outside surfa...

A measurement probe for a machine tool has a housing incorporating a window that allows the optical transmission or receipt of signals from/to infrared transmitters or receivers. To obviate the need to mount the transmitter and receiver components on an external surface of the housing, they are surface mounted to a circuit board.

The invention concerns, first, a signalling procedure for a lift, whereby the control system and the users of the lift are informed on lift calls and the state of the lift, e.g. position, movement and availability, by using serial communication between the control system computer and the actuating and signalling means in the lift car and on each floor level, and, second, a signalling system applying the said procedure. To avoid abundant and complicated wiring and to increase standardization in t...

A battery signalling system is provided which can be used to monitor and/or control a battery (1) having a number of series connected battery cells (C.sub.i) . When used to monitor the battery cells, the battery signalling system can comprise a central battery monitoring system (3) for monitoring the industrial battery (1) as a whole, a number of cell monitoring devices (CM.sub.i) for monitoring one or more battery cells (C.sub.i) and a communication link (9) for connecting the cell monitoring d...

A battery signalling system is provided which can be used to monitor and/or control a battery (1) having a number of series connected battery cells (C.sub.i). When used to monitor the battery cells, the battery signalling system can comprise a central battery monitoring system (3) for monitoring the industrial battery (1) as a whole, a number of cell monitoring devices (CM.sub.i) for monitoring one or more battery cells (C.sub.i) and a communication link (9) for connecting the cell monitoring de...

A method and means for generating a connection correlation identifier (CCID) in multiconnection calls over broadband networks is provided. Signalling with the CCID takes part at the users interface. The connection correlation identifier coordinates the individual connections with the respective multiconnection call. The CCID includes two parts, and originating part (OCCID) and a destination part (DCCID), where the OCCID is generated at the calling party and where the DCCID is generated at the ca...