Matches 201 - 250 out of 265 < 1 2 3 4 5 6 >
Match Document Document Title
5311346 Fiber-optic transmission polarization-dependent distortion compensation  
The polarization-dependent distortion of an optical signal transmitted through an optical fiber is reduced by aligning the polarization of the optical signal to minimize the received signal...
5305331 Data logging apparatus with memory and pattern testing device  
A data logging apparatus for a device function tester comprises a first shift circuit (1) supplied with an output signal of the tester and a strobe signal for shifting the output of the tester by n...
5295079 Digital testing techniques for very high frequency phase-locked loops  
A digital testing system providing for cost efficient comprehensive testing of very high frequency phase-locked loop performance parameters. The system tests PLL performance parameters both at...
5289178 Sensitivity indicator for a radio receiver and method therefor  
This invention provides an indication of quality of signal reception in a selection call system such as a paging system, by comparing received data with preprogrammed data and indicating the degree...
5276691 Method for the control of receiver synchronization in a mobile phone  
A receiver synchronization control in signalling messages in TACS/AMPS system in a mobile phone is disclosed. In order to avoid unnecessary setting of hunt mode operation, if the received...
5267300 High speed digital data transmission over switched voice network  
A dialed telephone connection can be implemented as an end-to-end digital connection by virtue of switched voice transmission facilities becoming more prevalent. If such a connection is detected,...
5265089 Loopback test circuit  
A digital multiplex communication system for carrying out digital multiplex communication between a plurality of terminal stations, at least two including one initiating party and the other party...
5251204 Transmission test system in a broadband ISDN  
The present invention relates to a transmission line test method in the broadband ISDN for assembling an ATM formatted cell into a frame and sending it in the synchronous optical network (SONET)...
5197062 Method and system for simultaneous analysis of multiplexed channels  
A method and system for test data generation, reception, synchronization and analysis of multiple channels within a multiplexed data stream is described herein. Latches on the parallel inputs and...
5189674 Fault locating system capable of quickly locating a fault in a hierarchical communication network  
In a fault locating system for use in combination with a communication network of a hierarchy comprising a plurality of communication units which are divisible into a plurality of layers, each of...
5179723 Mobile telephone device for carrying out an aging operation without interference with a mobile telephone system  
In a mobile telephone device (10) comprising a serial interface (13b) and subjectable to an aging operation with an aging device (20) connected to the serial interface, a central processing unit...
5168500 Method for automatically discriminating low-speed interface units installed in an optical data transmission apparatus together with automatically confirming the installation  
Code data of input type and output type low-speed interface units installed in one and other optical data transmission apparatus, placed opposite to and operatively connected to each other, are...
5163057 Method of and circuit arrangement for determining a cell loss and/or a cell insertion during traversal of a cell oriented transmission device by cell structured signals  
A method of and a circuit for detecting a cell loss and/or a cell insertion in cell structured signals traversing a cell oriented transmission module. A bit comparison is effected between a test...
5161151 System and method for controlling multiplex communications between master station and slave stations  
A system and method for controlling multiplex communication between a master station and a plurality of slave stations, in which a predetermined signal (dummy signal) is transmitted to the...
5138608 Circuit arrangement for testing parts of a digital time-division telecommunication switching center, particularly a telephone switching center  
A receiving circuit for evaluating check words received after traversing a test loop for coincidence with the check word transmitted is utilized in time-division multiplex operation for the...
5136591 Measuring method and device for fault analysis of digital transmission paths  
Bit error pattern analyses which supply information about the number and location of transmission errors have heretofore been carried out only at transmission speeds which permit instant processing...
5099480 Method of testing bit errors in ISDN circuits  
A method of testing bit errors in an ISDN circuit by employing a tester having the function of a terminal and by using the information channels of the frame of an ISDN. The tester sends out a known...
5072448 Quasi-random digital sequence detector  
Errors in a predetermined digital sequence are detected by utilizing a detector which includes memory elements such as a series shift register, and logic gates for detecting a predetermined...
4967412 Serial data frame generator for testing telecommunications circuits  
Disclosed is a serial frame generator which generates serial data which conforms to a user-selected telecommunication protocol. The serial frame generator can be used with a circuit board tester to...
4953096 Test method and apparatus for distributed system  
In a distributed system having a plurality of processors connected to a common transmission line, each processor comprises means for registering erroneous programs within the processor, and means...
4941115 Hand-held tester for communications ports of a data processor  
A hand-held battery-powered instrument tests communications ports of a data-processing system by analyzing received data frames for multiple conditions, such as parity, poll commands, and violation...
4910681 Multi-functionality television testing signal generator using digital scheme  
First to third memories store a plurality of functions constituting polynomials respectively representing at least one-line luminance, chrominance, and sync signal waveforms included in a...
4891639 Monitoring system of network  
There is provided a network monitoring system in which nodes are connected to the LAN as a communication medium using the token passing method and only the node to which the communication right was...
4890333 Test bench for wideband radio link  
A test bench is designed to determine the transfer function of a radio link in terms of variations in amplitude and a group propagation time depending on frequency. A transmission section of the...
4887279 Timing measurement for jitter display  
A timing measurement system for displaying data path and clock jitter moves an internal copy of the data clock with respect to the incoming data and clock to acquire sets of samples for each data...
4881229 Test circuit arrangement for a communication network and test method using same  
A built-in test-signal generator (TG) and a built-in error-detection circuit (PE) independent of the test-signal generator are provided in a novel circuit arrangement. In response to an external...
4868824 Measurement of missed start-up rate and missed message rate  
In a voiceband data multipoint network, each tributary modem transmits, in a trailer which follows the user data, a tributary modem identification, a sequence number which advances for each...
4858223 Security arrangement for a telecommunications exchange system  
A security arrangement for a telecommunications system having two security planes, a plurality of peripherals, a plurality of peripheral communication controllers; and switching arrangements...
4802162 Automatic protocol synthesizing system  
An automatic protocol synthesizing system in which, incomplete state transition diagrams of at least two functionally incomplete processes forming a protocol are received and completed state...
4797885 Distributed processing system and method  
In a processing system including a plurality of processing units connected to a common transmission line, the improvement for permitting program tests under on-line environments characterized in...
4744083 Satellite-based position determining and message transfer system with monitoring of link quality  
A radio position determination and message transfer system is implemented using a number of satellites in geostationary orbit for relaying interrogation and reply signals between a ground station...
4709376 Received signal processing apparatus  
An apparatus for processing a digital signal which is transmitted from a transmit station by radio equipment and contains the same repetitive information employs the principle of decision by...
4686641 Static programmable powerline carrier channel test structure and method  
Structure for and method of automatically testing an electrical transmission powerline carrier channel on a programmable basis electronically from any end of a multi-ended powerline, including an...
4680581 Local area network special function frames  
In a local area network having a plurality of nodes, wherein the local area network utilizes a token passing scheme for communicating between nodes, each node has an interface apparatus which...
4580274 Transceiver test device  
A device for testing the digital waveforms in a special purpose multi-channel transceiver system designed to operate in a tactical environment. As selected waveforms are presented to the test...
4573153 Data transmitting-receiving system for suppressing data error  
A data transmitting-receiving system includes a transmitter unit, a transmission line, and a receiver unit. The transmitter unit includes a first memory circuit receiving first digital input data...
4546467 Monitor for transmission line  
A monitoring device for monitoring the status of communication units connected to a common transmission medium. The monitoring device sequentially addresses each communication unit and transmits to...
4538269 Programmable coding and decoding arrangement  
A coding and decoding arrangement situated between and connected to digital and analog telecommunication lines includes a plurality of signal processing components which are arranged in respective...
4501003 Dial pulse measurement circuitry  
A method for analysis of rotary dial pulses focuses on transitions between pulse levels and differentiates true level changes from noise using a procedure employing two sample counters. One counter...
4428076 Method of and system for evaluating bit errors in testing a signal path  
In order to evaluate the fidelity of a transmission line or other test object, a pseudorandom bit pattern is fed to the input end of that test object and is compared bit by bit with the pattern...
4390984 Status check method for a data transmission system  
In a data transmission system with such a construction that a plurality of terminal units are connected to a first and a second loop transmission line for transmitting messages in a first direction...
4390989 Method and an arrangement for supervising faults when transmitting data between computers  
Arrangement in data transmission between a transmitting computer, sending signal words containing start-stop information, message words and address-control signal information, and a receiving...
4320881 Fail-safe decoder for digital track circuits  
A selected unique digital comma-free code word is transmitted through track section rails from one end and, when received at the other end, is applied serially to a shift register which supplies a...
4315330 Multiple data rate testing of communication equipment  
The invention finds application in a TDMA communications controller having a plurality of i input/output ports. The input/output ports transfer data from respective, local data users to a transmit...
4302843 Method and apparatus for measuring transmission characteristics of a test object during communication gaps  
A method for measuring the transmission characteristics of a transmission line during gaps in communications on said transmission line consists of monitoring the transmission line for a gap in...
4155073 System for monitoring integrity of communication lines in security systems having remote terminals  
A line monitoring system is disclosed which provides particular advantages to security systems having remote terminals. This system provides both a reduction in the required power for the line...
4053723 Method and apparatus for measuring the bit error frequency in a cable caused by crosstalk between line pairs during transmission of a 3-level coded PCM signal  
A method and an apparatus for measuring the bit error frequency in a cable caused by crosstalk from at least one disturbing pair to a disturbed pair at transmission of a 3-level coded PCM signal...
4042794 Method and means for detecting an outgoing failure in a bidirectional communications span and looping the same in response thereto  
An automatic span line switch for PCM communication lines is disclosed which isolates alarm conditions to an actual span line failure, as distinguished from failures in the terminal equipment. In...
4022988 Fault locating apparatus for digital transmission system  
Defective repeaters in a multihop, digital microwave transmission system are located by the use of a special test pattern which is generated at the transmitting terminal. At each repeater station,...
3986168 Multichannel error signal generator  
A digital error signal generator produces a pseudorandom bit sequence having a predetermined probability density. Selective multiple pseudorandom bit densities, each having a predetermined...
Matches 201 - 250 out of 265 < 1 2 3 4 5 6 >