Patents Assigned to Telecom
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Patent number: 5884693Abstract: A passive cooling system for cooling an enclosure containing electronic components. A hollowed portion of the enclosure is formed as an integral heat pipe containing a working fluid. The hollowed portion has an evaporator section located at the top and a condenser section located at the bottom. The enclosure also has hollowed side walls which serve as passage ways for the working fluid to flow through in between the evaporator and condenser sections. Gravity and the pressure of evaporation force the working fluid down to the condenser section. A wick is provided for returning the working fluid to the evaporator section by capillary action. Additionally, an ultrasonic transducer driven by the heat rejected from the condenser section may be used to help return the working fluid to the evaporator section. Finally, a check valve may be employed before the evaporator section for the working fluid to flow through.Type: GrantFiled: December 31, 1997Date of Patent: March 23, 1999Assignee: DSC Telecom L.P.Inventors: Thomas A. Austin, Stephen Greer, Andrew Low
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Patent number: 5886668Abstract: Hand-held transmitting and/or receiving apparatus, including a housing made of electrically non-conductive material, an electric circuit positioned within the housing, an electrical ground plane positioned within the housing, an antenna resonator element extending approximately parallel to the ground plane and having a first free end and a second end electrically connected by a ground connector to the ground plane and an arrangement for connecting the ground plane and the resonator element to the electric circuit. The resonator element, the ground plane and the ground connector are positioned about and fixed to a dielectric body positioned inside the housing. This antenna is easily manufactured and reduces the influence of mechanical tolerances and mechanical and thermal influences on the electrical parameters of the antenna.Type: GrantFiled: August 19, 1997Date of Patent: March 23, 1999Assignee: Hagenuk Telecom GmbHInventors: Gert Fr.o slashed.lund Pedersen, Jan Gert Thomsen
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Patent number: 5886552Abstract: An improved data retiming circuit which is capable of more effectively retiming an externally inputted data by using a plurality of clocks from a voltage controlled oscillator of a phase-locked loop.Type: GrantFiled: May 20, 1997Date of Patent: March 23, 1999Assignees: Electronics And Telecommunications Research Institute, Korea TelecomInventors: Sang-Hoon Chai, Hee-Bum Jung, Won-Chul Song
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Patent number: 5883822Abstract: A device for programmable delay of an analog signal in an acoustic antenna that comprises at least one analog/digital converter circuit delivering, from the analog signal, a digital signal at a first sampling frequency, followed by a delay memory receiving the digital signal in write mode, making it possible to store M consecutive samples in memory. A circuit for write and read access to the delay memory is provided to address the delay memory in write and read mode, which, under read access control, delivers a series of samples delayed by a defined value, a function of the number of samples M stored therein. A sub-sampling circuit receives the delayed digital signal and delivers a sub-sampled delayed digital signal at a second sampling frequency less than the first sampling frequency.Type: GrantFiled: April 24, 1996Date of Patent: March 16, 1999Assignee: France TelecomInventors: Gregoire Le Tourneur, Freddy Balestro
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Patent number: 5883927Abstract: A digital wireless telecommunication device for reduced interference with hearing aids includes an assistive listening device detector. The assistive listening device detector identifies the presence of different types of assistive listening device signals. In response to such a signal, the assistive listening device detector generates a reduced interference demand signal. Reduced interference digital wireless telecommunication output signals are generated in response to the reduced interference demand signal. The reduced interference digital wireless telecommunication output signals are typically in the form of full rate transmitter output signals. A variety of techniques are disclosed to produce the full rate transmitter output signals. The reduced interference digital wireless telecommunication output signals minimize disruptions to hearing aids in the vicinity of the digital wireless telecommunication device.Type: GrantFiled: July 31, 1996Date of Patent: March 16, 1999Assignee: Nextwave Telecom, Inc.Inventors: James Steven Madsen, Richard Kornfeld
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Patent number: 5884177Abstract: A cellular communication system and method providing improved handoff capability which reduces muting during handoffs. During handoffs, the system simultaneously monitors received signals from both the serving cellsite on a first channel and the target cellsite on a second channel and outputs the received signal containing an information signal. Additionally, the system simultaneously transmits an information signal to a mobile unit via the serving cellsite on a first channel and via the target cellsite on a second channel.Type: GrantFiled: October 25, 1995Date of Patent: March 16, 1999Assignee: Northern Telecom LimitedInventor: Donald V. Hanley
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Patent number: 5883889Abstract: The present invention is based on a tri-cellular grouping of three identical cells. Each cell of the tri-cellular group is driven by a directional antenna that radiates the cell from the center of the group. Multiple tri-cellular groups make up a cellular system having three axes at 0.degree., 120.degree., and 240.degree.. Each axis is comprised of seven total layers, one layer being a repeat of another of the layers. The 512 available system PN offsets are divided up into three groups of 24 offsets, one group for each axis. Each PN offset group is reused only in the direction to which it is assigned.Type: GrantFiled: February 6, 1997Date of Patent: March 16, 1999Assignee: Northern Telecom LimitedInventor: Saleh Faruque
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Patent number: 5884164Abstract: Following a call set-up request transmitted by a terminal of a given user of a telecommunications system using a constellation of non-geostationary satellites, the terminal reserves a channel in the cell in which it is located and in neighboring cells not including all the cells it will have to cross during a predetermined time period. For each cell where a channel has not been reserved, the given user's terminal waits until it is at a predetermined distance from its point of handover into the cell, equal to the greatest distance a user can travel in the cell, before transmitting a reservation request. The call set-up request is accepted only if a condition relating to the number of other users near the given user at the time of the call set-up request is satisfied.Type: GrantFiled: October 7, 1997Date of Patent: March 16, 1999Assignee: France TelecomInventors: Maral Gerard, Joaquin Restrepo
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Patent number: 5883784Abstract: Mounting for holding a planar electronic device, e.g. a printed circuit board in electronic slots to receive edges of the electronic device and a clamp is inserted into each slot to clamp an edge of the device in heat conductive engagement with a side surface of the slot. The clamp has a rigid elongate clamp element inserted along the slot, springs to urge the clamp element towards the side surface of the clamp to provide a clamping action and a lever to move the clamp element out of a clamping position to release the electronic device.Type: GrantFiled: April 4, 1997Date of Patent: March 16, 1999Assignee: Northern Telecom LimitedInventors: Richard P. Hughes, Trevor G. Zapach, Patrick T. Lawless
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Patent number: 5883819Abstract: A method and system for assessing quality of service for multimedia traffic under aggregate traffic conditions in a shared transmission network, such as an ATM network. A total number of different traffic services as well as a maximum number of sources for each traffic service are specified by a network operator/designer. Next, for each traffic service a specification of peak rate, average idle sojourn time and an average burst sojourn time are determined, either based upon available standards or calculated based upon models of the traffic services. The total available system bandwidth is specified by a network operator/designer. Finally, the number and size of queues utilized for receiving packetized telecommunication traffic within the network are specified.Type: GrantFiled: December 31, 1996Date of Patent: March 16, 1999Assignee: Northern Telecom LimitedInventors: Hosame Hassan Abu-Amara, Venkat Kotamarti
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Patent number: 5881273Abstract: An apparatus generates a set of a reference clock pulse and a reference frame pulse signals (RCPS and RFPS) for use in an access subsystem processor of an electronic switching system. At first, a set of a clock pulse and a frame pulse signals (CPS and FPS) generated from a processor associated with the apparatus is received and converted into a converted set of a RCPS and a RFPS. Next, a functional fail signal is obtained based on processor and signal status information from the link processor.Type: GrantFiled: May 30, 1997Date of Patent: March 9, 1999Assignee: Daewoo TelecomInventors: Jae-Peoung Kim, Jong-Hwan Oh
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Patent number: 5881369Abstract: A dual mode transceiver architecture suitable for adaptation in either a handset or a base station and capable of operating in both Frequency Division Duplex (FDD) mode or in Time Division Duplexing (TDD) mode is disclosed. Such a transceiver has an up conversion path capable of up converting an Intermediate Frequency (IF) to a Radio Frequency (RF) signal in either an upper band frequency range or a lower band frequency range. Also the transceiver has a down conversion path, used for receiving, for down converting a RF signal in either the upper band or lower band to a desirable IF frequency. The transceiver includes a switch array capable of switching the up conversion path to either the upper band port or the lower band port of a diplexer and the switch array also switches the upper band port and lower band port of the diplexer to the down conversion path depending on whether the transceiver is operating in TDD mode or FDD mode.Type: GrantFiled: July 3, 1996Date of Patent: March 9, 1999Assignee: Northern Telecom LimitedInventors: Stuart James Dean, David William Park
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Patent number: 5881140Abstract: A telecommunications network (10) includes a plurality of telecommunication switches (12). Each telecommunication switch (12) includes a set of processors (14) in order to provide a distributed architecture. A network processor (16) periodically communicates with each set of processors (14) of each telecommunication switch (12) to collect various switch and network information and respond with routing recommendations. These routing recommendations are provided in response to a switch utilization index determined for each telecommunication switch (12). The switch utilization index provides an up to date picture of the in service trunks and a realistic figure of the global load on the processors (14). The switch occupancy index is based on trunks, call attempts, time, and switch type and is defined as the ratio of new call arrival rate to the maximum call arrival rate for a dynamically controlled routing processing cycle.Type: GrantFiled: October 2, 1996Date of Patent: March 9, 1999Assignee: DSC Telecom L.P.Inventors: Bernard J. Gerault, Meanhuy S. Chen
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Patent number: 5881049Abstract: The invention resides in a precise technique for determining the equivalent bit rate (EBR) of a variable bit rate (VBR) ATM connection. The technique extends a known single-source method developed by Gibbens and Hunt. The new technique applies to shared facilities and hence exploits the statistical-multiplexing gain. The calculation of the EBR is quite fast and is therefore suitable for real-time call-admission control in ATM switches. The admission criteria may be based on either the cell loss or cell delay.Type: GrantFiled: October 3, 1996Date of Patent: March 9, 1999Assignee: Northern Telecom LimitedInventors: Maged E. Beshai, Todd D. Morris
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Patent number: 5881052Abstract: A method for use in an electronic switching system (ESS) analyzes M.times.N sets of line signals communicating between itself and at least one other ESS. At a first step, two previous sending and receiving line signals for a voice channel from each of the two ESS's are provided as a first pair of line signals. At a second step, two current sending and receiving line signals from each of the two ESS's form a second pair of line signals. At a third step, each of the line signals in the second pair is compared with its corresponding line signal in the first pair to check whether at least one line signal in the second pair is different from the corresponding line signal in the first pair. At a fourth step, if the checked result is negative, the second and the third steps are repeated for a predetermined duration, and if otherwise, a time interval value between one of the line signals in the second pair and its corresponding different line signal in the first pair is calculated.Type: GrantFiled: November 21, 1996Date of Patent: March 9, 1999Assignee: Daewoo Telecom Ltd.Inventor: Seung-Mo Cho
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Patent number: 5881145Abstract: In a telephone network having a plurality of network nodes, each having a unique network address and using out-of-band signalling for call setup and routing, a method is provided for the routing of calls to a "ported" directory number which has been ported from a donor network node to a recipient network node. The method comprises the steps of (i) routing the call, using the ported directory number as the Called Party Number, from an originating network node towards the donor network node; (ii) intercepting the call at an intermediate network node between the originating network node and the donor network node, through which intermediate network node calls to the donor network node must pass; (iii) converting the ported directory number to a network address of the recipient network node; (iv) routing the call to the recipient network node using said network address; and (v) at the recipient network node, completing the call to the ported directory number.Type: GrantFiled: July 29, 1996Date of Patent: March 9, 1999Assignee: Northern Telecom LimitedInventors: Adrian Giuhat, Edgar Martinez
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Patent number: 5881060Abstract: An integrated voice and packet data telecommunications system has at least one dual mode channel. The system comprises a plurality of transceivers, at least one transceiver being operable to transmit and receive voice traffic on the dual mode channel, and at least one transceiver being operable to transmit and receive packet data traffic on the dual mode channel. The system further comprises a controller for controlling the transceivers so as to allocate the dual mode channel either to voice communications or to packet data communications. The controller responds to changing demand for voice channels and packet data channels by changing dynamically the allocation of the dual mode channel. The system is particularly useful for providing Cellular Digital Packet Data (CDPD) services.Type: GrantFiled: May 30, 1996Date of Patent: March 9, 1999Assignee: Northern Telecom LimitedInventors: Glenn Charles Morrow, Emad Abdel-Lateef Qaddoura, Charles James Derrick, Kenneth W. Pecot, Nivedan Thadasina, Nikhil Jain, Patricia Ann Landgren, Bradley A. Fink
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Patent number: 5880837Abstract: A pulsed optical signal (13) of a network (23) is monitored to obtain eye measurement data as a means of obtaining an indication of signal degradation. Optical sampling of the optical signal is effected by means of an interferometer (2) in which sampling optical pulses (8) are propagated equally through arms 3 and 4 of the interferometer which include semiconducter optical amplifiers. The optical signal to be monitored is counter propagated through one arm of the interferometer, thereby setting an interference condition of the interferometer by cross modulation in one of the semiconductor optical amplifiers. The output is detected and converted to electrical signals which are processed to obtain the eye measurement data. Parameters defining the quality of the eye are extracted and processed to locate defects occurring within a network by deploying eye monitors at a number of locations. Elements of the network may be controlled using the output parameters.Type: GrantFiled: July 15, 1997Date of Patent: March 9, 1999Assignee: Northern Telecom LimitedInventor: Kim Byron Roberts
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Patent number: 5878119Abstract: A compression technique is used to suppress the idle or silent portion of both stations in a facsimile transmission. Facsimile transmission is a half-duplex protocol resulting in considerable idle time for either the called terminal or the calling terminal. The invention provides a signal level threshold for each station whereby signals above the threshold are allowed to pass through while signal levels below threshold are not, resulting in more efficient network bandwidth utilization.Type: GrantFiled: June 18, 1997Date of Patent: March 2, 1999Assignee: Northern Telecom LimitedInventors: Adam Chellali, Andrew McGregor
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Patent number: 5878122Abstract: A long distance service bureau assists subscribers in selecting a long distance carrier for a long distance, or tariff, call. The long distance service bureau includes a rate table memory and a service logic element. The rate table memory stores rate data, representing tolls charged by various long distance carriers, and subscriber preference data, representing a subscriber's preferences for certain ones of the various long distance carriers. The service logic element controls the rate table memory. The service logic element periodically communicates with the various long distance carriers to retrieve rate data changes, stores the rate data changes in the rate table memory, and downloads only the rate data changes to local equipment of the subscriber during idle periods of the subscriber's local equipment.Type: GrantFiled: February 7, 1997Date of Patent: March 2, 1999Assignee: Northern Telecom LimitedInventors: Lester Lynn White, Harminder Singh, Peter A. Fortman