A method of transmitting signalling information in a Public Land Mobile Network (PLMN) between a pair of peer application part. An adaptation layer is interposed between the SCCP of an SS7 network and a TCP/IP part to allow signalling data to be transmitted to and from the SCCP via an IP based network. The adaptation layer provides for translation between Destination Point Codes (DPCs) and or global titles, used as addresses in the SS7 network, and IP addresses/port numbers for use in the IP net...

A portable fire extinguisher assembly includes a fire extinguisher with a tank containing fire extinguishing material, a valve for metering release of the fire extinguishing material, and a gauge displaying pressure within the tank, and a docking station in communication with the fire extinguisher. An electronic circuit in communication with the fire extinguisher and the docking station issues a signal upon detection of predetermined conditions, including at least one predetermined internal cond...

A signalling device applies a pulsating signal to supply lines when a head is removed from a base. A monitoring system includes a plurality of such signalling devices and is responsive to the pulsating signal to indicate the absence of a head from its base. When a pulsating signal is already on the supply lines, its waveform is preserved independently of the number of heads removed from respective bases. A timer is triggered either to ensure synchronisation of pulsating signals generated by two ...

A method of establishing transmissions to a mobile station in a wireless radio communications system where an indication of the radio service requirement is provided to the mobile terminal. A switch receives a signal originating a call. The switch notifies a network accordingly with a paging message. The paging message is supplied to the mobile station. The indication of the radio service requirement is provides as part of, or with, the paging message. Subsequently, only those cells that fulfil ...

A telephone operated signalling system for use with a telephone having a manually operated switch and which is connected to a telephone substation where the system has room status indicating means responsive to operation of the manually operated switch, and means for disconnecting the telephone from the substation and connecting it to the signalling system. Indicator switch means are positioned between power means energizing the indicating means whereby the indicating means may be deenergized du...

A method for identifying that a data communications device is operable in a predetermined mode. The first step of the method provides for generating a frequency division modulation capabilities signal. The generated signal is limited to a predetermined frequency range. The method further provides for superimposing mode identification information upon the generated signal to form a modified signal. Like the generated signal, the modified signal falls within the predetermined range. The superimpos...

A signalling circuit including an electrical to acoustic transducer which is sequentially energized by a pulsatile ringing source includes a potentiometer in series between the source and transducer. The potentiometer is continually decreased in resistance as source pulsations continue so that each successive acoustic output is of increased intensity. The wiper of the potentiometer is a needle of a meter movement and the fixed resistance of the potentiometer is arcuate and positioned in place of...

In a train control signalling system, a wayside signal of an unknown code rate is detected and decoded on board the train to determine the code rate and derive the coded train control intelligence. The code rate is determined by counting the number of cycles of a known higher frequency which occur during one period of the unknown code rate. Before a train command signal is issued, a number of tests are performed to verify that the determination is accurate with no margin for error. The known hig...

A frequency signaling circuit includes a plurality of channels, each channel having division means for frequency division of a clock signal, the division ratio being selected in accordance with data defining the required frequency. Stochastic conversion means are provided for converting the output of the frequency division means into pulse trains with the repetition rate of the required frequency. The stochastic conversion means includes a noise generating circuit, a value generating circuit for...

This disclosure pertains to a signaling apparatus installed within a movable large vehicle, such as a truck. Two sensing heads are utilized by mounting one of each on the frontmost opposed sides of the vehicle. Each sensor is manually selectively energized so as to detect the distance separating a vehicle being passed from the equipped vehicle on the side of the energized sensor. The sensors may utilize sound, radio or light waves to operate a conventional range detecting apparatus. A comparetor...