Siemens Aktiengesellschaft

Aktiengesellschaft

Ingrid Fromm

Stefan Karapetkov

Bernhard Petri

Hans Unterberger

Helmut Lagger

System for the bidirectional connection of an ELAN and a CLS wide-area network (CLSnet) having an address memory for allocated MAC addresses of the ELAN (ELAN,, . . . ) and E.164 addresses of the CLS network (CLSnet), having a memory for an E.164 address allocated to the transition to the CLS network (CLSnet), and having a controller in order, dependent on specific conditions, to handover frames coming from the ELAN to the interface to the CLS network in common with the E.164 address belonging to the destination MAC address or, respectively, to discard them, whereby frames having a local broadcast MAC address as destination address are always to be discarded, and in order to hand frames coming from the wide-area network over to the interface to the ELAN.

System (IWF) for the bidirectional connection of an ELAN and a CLS wide-area network

Process for transferring data packets between emulated LANs

Method for the transmission of information packets between emulated LANs

Process for determining a target ATM address

An optical monitoring device includes a reflector, which is mounted on a surface of a rotating member adjacent the periphery to travel in a circular path, and a light source, which creates an input beam which either is directed at a given angle of incidence at a point on the circular path of the reflector or is directed through a waveguide at the point. The device also includes a second waveguide which is arranged on the path of light reflected by the reflector and conducts the reflected light to an opto-electrical transducer which converts the reflected light pulses into electrical pulses which are applied to a source of sound, such as a piezo ceramic plate with a resonator which creates an alarm when a certain frequency is reached.

Optical device for monitoring critical speeds of a rotating member

An optical device for monitoring the speed of a rotating member characterized by a reflector mounted on a surface of the rotating member adjacent the periphery to travel in a circular path, a light source creating an input beam and either directing it at along a given angle of incidence at a point on the circular path of the reflector or through a waveguide at the point, a second waveguide arranged on the path of light reflected by the reflector and conducting the reflected light to an opto-acoustical transducer which converts the reflected light pulses into sound.

A method and device for monitoring and minimizing the splicing losses at a splicing location for glass fiber cables characterized by a measuring cylinder which has a hinge to enable opening the cylinder up to place it around a splicing connection and has a photosensitive layer for converting a light escaping at the splicing location into an electrical signal and a device for evaluating the electrical signal. The photoelectric sensing device can be a continuous layer or a series of photoelectric elements electrically interconnected and the device for evaluating the electrical signal produced by the photoelectric sensing device preferably includes ear phones which converts the electrical signal into an accoustical signal and the light being applied to the cable is applied with a frequency in the audible frequency range of an ear. If a continuous light signal is sent or an extremely high frequency light signal, an electrical current measuring device can be utilized to evaluate the output of the sensing layer or elements.

Method and a device for monitoring and minimizing light losses at a

An arrangement for signaling in a voice communication system having optically fed components employs light wave guides which, in addition to serving for the transmission of the communication signals, also serve for the communication of the signals required for completing and disconnecting connections and for the transmission of energy in the form of light for the energy supply of the subscriber stations. The energy for supplying the subscriber stations is transmitted in the form of unmodulated light. The frequency of the unmodulated light deviates from the fundamental frequency of the light signal transmitted from the switching center to the subscriber station. A diplexer is arranged at the subscriber station for the incoming light and conducts the incoming modulated light to a loudspeaker by way of an optical transfer switch and an optoelectronic transducer and feeds the unmodulated light to an acousto optical modulator. In the switching center, apparatus is provided for periodically interrogating all subscriber stations with short light pulses as to their operating conditions. First and second optical transfer switches are provided in the subscriber substations and are indirectly synchronously actuatable by the subscriber, preferably by the handset. The short light pulses are absorbed by an optoelectronic transducer in the idle condition of the subscriber station and are at least partially reflected by an acousto-optical modulator in the activated condition for an outgoing call. In the case of an incoming connection, continuous light or continuous light pulsed in the call rhythm, of two frequencies is transmitted to the subscriber station for activating the call element. The short light pulses for interrogating the operating condition are dimensioned in terms of pulse length and in terms of pulse-to-pause ratio in such a manner that, on the one hand, the call element is not activated and, on the other hand, no noticeable delay of the completion of an outgoing connection occurs.

Arrangement for signaling in a voice communication system with optically

An optical device for measuring slight pressure differences by means of a light intensity change characterized by a membrane extending across a recess of a housing part to form a first chamber of a first volume which is isolated from a second chamber on the opposite side of the membrane, a right angle isosceles glass prism mounted in the recess with a hypotenuse surface facing said membrane and extending parallel thereto, an input optical waveguide coupled to one short side surface of the prism extending to the light source of a given light intensity for coupling light from said source into the prism and an output optical waveguide being coupled to the other short side surface of the prism for output coupling light from the prism to a measuring device. The surface of the membrane opposite the hypotenuse surface is a light receiving surface such as either by absorbing light or being permeable to light and the membrane surface with the membrane in an idle condition is spaced at an interval such as not greater than the wavelength of the light being used so that approximately 50% of the coupled in light intensity is totally reflected by the hypotenuse surface. Changes in the position of the membrane will cause changes in the intensity which can be measured to determine the pressure differences.

Optical device for measuring slight differences of pressure by means of

An optical device for measuring both slight positive and negative pressure differences by means of a light intensity change characterized by a gradient lens having a first and second end face being mounted in a housing part with a second end face spaced from a partially reflective membrane which is secured to the housing part to form a first chamber of a first volume and a second chamber of a second volume. An input waveguide such as an optical fiber is connected to a light source and is connected to the first end face of the lens and a pair of output waveguides are coupled to the first end face at two points displaced from the input fiber and a separate light intensity evaluation device connected to each of the output waveguides so that both positive and negative changes in pressure between the two chambers causes the membrane to be flexed and cause a reflective surface to move from a parallel position to cause a reflected image point of the input waveguide to move along the first end face with positive changes of pressure cause an increase of the intensity of the light being received by the one output waveguide and a negative pressure change causing the increased intensity in the other waveguide.

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Munich, Germany

Ingrid Fromm