Abstract:
An Earth station having an antenna is configured to establish communication with a satellite. The Earth station stores a table of satellite position data for a plurality of satellites and is configurable to enable its own location position on the surface of the Earth as well as the azimuth and elevation of its antenna to be obtained. The tabulated satellite position data is then utilised to calculate the position of the satellite in relation to the location position. Thereafter at least one of the satellites is selected with which to establish communication and in response to the selection and the obtained azimuth and elevation, a direction is determined in which to configure the antenna for operation with the at least one selected satellite. Following determination of the direction, the antenna is configured for operation with the at least one selected satellite. The location position and the azimuth and elevation of the antenna may be determined through the Earth station comprising a GPS receiver. The Earth station may be configured as a mobile, portable or fixed unit and the invention is configurable to enable communication to be established with geostationary satellites, non-geostationary satellites or a combination of both geostationary and non-geostationary satellites.
Abstract:
A billing scheme for a telecommunications network is described in which a billing record for a call including at least a plurality of data bytes is generated in a switch (10), each billing record is duplicated, and check information is generated from each data byte of a billing record and associated with each said data byte to form a protected billing record. Each protected billing record of a duplicated pair is transmitted via two independent transmission lines to processing means (40, 50) in which the associated check information is generated byte-for byte from each received billing record and the generated check information is compared byte-for-byte with the transmitted check information in parity checking circuits (60, 61). If for any one byte of a billing record, the generated check information does not agree with the received check information, that billing record is discarded. If there is no inconsistency between the received and generated check information for both billing records of a duplicated pair, the two billing records of the pair are compared bit-for-bit in a comparator (70). If any difference is found between the billing records of the pair, both billing records are discarded. Otherwise the received billing records are stored in non-volatile memory (75).
Abstract:
A radio frequency antenna arrangement for selective operation at orthogonal polarizations of electromagnetic radiation. The antenna arrangement comprises at least one radiating element, such as one or more antenna patches, each having a vertical polarization feed point and a horizontal polarization feed point. The arrangement also includes a vertical feeder circuit for coupling a radio frequency modulated electromagnetic signal to the vertical polarization feed point of the or each radiating element, a horizontal feeder circuit for coupling a radio frequency modulated electromagnetic signal to the horizontal polarization feed point of the or each radiating element and a terminating resistive load. A switch mechanism is provided for selectively coupling the electromagnetic signal to one of the horizontal feeder circuit or the vertical feeder circuit and for selectively coupling the load to the other of the horizontal feeder circuit or the vertical feeder circuit. In the first position of the switch the electromagnetic signal is coupled to the horizontal feeder circuit and the resistive load is coupled to the vertical feeder circuit and the antenna arrangement operates predominantly in the horizontal polarization. In the second position of the switch the electromagnetic signal is coupled to the vertical feeder circuit and the resistive load is coupled to the horizontal feeder circuit and the antenna arrangement operates predominantly in the vertical polarization. In a first embodiments of the invention the switch mechanism is located at the interface between two antenna housing parts and the required polarization is selected by mechanical alignment of the housing parts relative to each other. In a second embodiment of the invention the switch mechanism is integrated onto the feeder circuits.
Abstract:
An optical logic device is provided by an interferometer in which an output optical signal is determined in accordance with an interference condition of the interferometer. The interference condition is reset by an optical setting signal which is counter-propagated through a semi-conductor optical amplifier forming one arm of the interferometer. Latching of the interference condition in the set state is achieved by a feedback signal taken from the output optical signal and combined with the setting signal. Resetting of the interference condition is achieved by nulling the output optical signal by counter-propagating a reset optical signal via second semiconductor optical amplifier constituting the second arm of the interferometer. Alternatively the input optical signal to the interferometer may be interrupted to null the output. A further alternative arrangement utilizes an electrical re-setting signal which actuates an electrical phase shifting device in the second arm of the interferometer. The device has particular application to all optical control of high bit rate communication signals.
Abstract:
An apparatus and method for providing a telephone operating company with the ability to rapidly deploy advanced services into a public switched telephone network includes a programmable switch matrix, a service control unit (SCU), and a media resource unit (MRU). The call processing of a call (associated with one or more ports on the programmable switch matrix) is controlled externally by the SCU when particular triggering criteria is met (i.e., the call requires or desires control by the SCU). Call control processing is achieved through a high-speed communications link between the programmable switch matrix and the SCU using a communications protocol defining a comprehensive set of primitives (instructions) for call manipulation and control at the programmable switch matrix. The SCU executes different service application software programs that operate within the SCU for different types of service calls that are under the control of the SCU. The MRU interconnects between the SCU and the programmable switch matrix to provide voice processing and message capabilities for connection to a service call via the programmable switch matrix.
Abstract:
A method and apparatus in a communications system for facilitating a financial transaction between two parties within the communications system. The method of the present invention is implemented in a data processing system. A request for a financial transaction is received from the first party. A call is initiated by the data processing system to the second party associated with the request. The call is established between the first party and the second party wherein the financial transaction is established between the two parties through the call. Data is acquired from the two parties in response to the establishment of the financial transaction through the call. First party information and second party information is verified, wherein the financial transaction is securely completed.
Abstract:
A call servicing system allows service agents to service calls from customers. The system includes local customer switches, local agent switches, and a customer database connected to a network call center. The local customer switches direct calls to and from the customers and the local agent switches direct calls to and from the service agents. The customer database stores information regarding the customers sending the calls. The network call center receives a call from a first one of the customers, queries the customer database to retrieve customer information corresponding to the first customer, and concurrently routes the customer call and the corresponding customer information to one of the service agents.
Abstract:
A wireless telephone system provides telecommunications services for personal wireless telephone sets over an area which is divided into service cells. Each of the cells is defined by reception characteristics of a plurality of radio base stations within the cell. The telephone system includes a service controller and a port being wireline connected between each radio base station and the service controller. The service controller selects radio base stations for setting up radio links with wireless sets of calling or called persons. A base station which serves a wireless set and surrounding idle base stations monitor strengths of radio signals received from the wireless set and report running averages of the monitored signal strengths to the service controller. Movement of the wireless set from one cell to another cell during a call is detected as a drop in the running average reported by the serving base station. The service controller selects an idle base station to which the call is handed off based on the running averages reported by the idle base stations only idle base stations having a running average greater than the serving base station report their running average.
Abstract:
The operationality of instructions arranged to control a telecommunications switch is tested by referring to originating instructions. A module of instructions forming part of encoded sets of originating instructions is identified, and the module is processed to obtain definitions of its interactivity with other modules of the instruction set and the interactivity with signal transmissions external to the module. This facilitates the generation of upgraded or replacement originating instructions from which new executable instructions are obtainable after being embedded within the telecommunications switch.
Abstract:
Annealing a planar wave guide layer is critical because small structural imperfections lead to optical problems. Chemical vapor deposition of the layer tends to leave gaseous substances bonded to the deposit, which on being driven off by initial annealing warm-ups leave cavities requiring densification. Traditional annealing methods take several hours. This invention proposes a rapid heating of the layer to a temperature below the flow temperature, maintaining this temperature for about 30 to 300 seconds, then rapidly heating up further to a temperature close to or above the flow temperature, maintaining this temperature for about 30 to 300 seconds, then allowing the substrate and layer to cool rapidly to room temperature.