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5412709 |
Digital telephone station line controller
A digital station line controller is connected via a digital link, such as a T1 span, to the line side of a central office and via digital station line loops to digital terminal devices, such as...
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5406548 |
Line accommodation circuit capable of switching from an active system to a standby system without a loss of a communication information signal
A line accommodation circuit for use in combination with a cell exchange apparatus to convert a sequence of input data signals into a sequence of asynchronous transfer mode cells is provided with...
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5402440 |
Processes for testing bi-directional serial transmissions, and circuits for their implementation
The invention relates to tests for verifying the integrity of circuits (16) for serial bi-directional transmissions. These tests are capable of testing transceivers (12) operating a very high...
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5396618 |
Self-diagnosing method for digital signal processing system
A method of self-diagnosis in a digital signal processing system. The digital signal processing system comprises a digital signal processing apparatus which includes a plurality of electronic...
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5375159 |
System and method for remote testing and protocol analysis of communication lines
In a switched telecommunications network having multiple SPC switches connected to one another by trunks and connected to signal transfer points (STPs) by common channel signal (CCS) links, dual...
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5371733 |
Method and apparatus for centralized determination of virtual transmission delays in networks of counter-synchronized communication devices
For use by a particular node within a digital data communications network having a plurality of counter-synchronized nodes including the particular node, called the central service node (CSN), and...
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5367394 |
Test apparatus
A test apparatus is designed for use with a TPON system including a headend station connected via a fibre optic network to a plurality of terminations. The test apparatus is a self-contained unit...
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5365514 |
Event driven interface for a system for monitoring and controlling a data communications network
An Event Driven Interface (EDI) is disclosed for use as a subsystem of a monitoring and control system for a data communications network. The network communicates a serial stream of binary bits...
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5361293 |
Line/drop testing from a craft terminal using test unit
A subscriber equipment (210) is isolated (238, 234) at a line card (208) in a line shelf (200) and drop testing is conducted over a test-out bus (240) by a test unit (220) connected (236) to the...
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5347576 |
Line interface unit retrofit circuit
A retrofit circuit for communication one of three conditions from a line interface unit (LIU) to a receiver unit (RU), using only one external connection between the LIU and the RU. The LIU has a...
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5313197 |
Self-diagnostic paging system
A paging system (100) includes a transmitter (104) for transmitting first information including a transmitted page, a receiver (108) for receiving second information, and a diagnostic controller...
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5282224 |
Signal processing integrated circuit device
There are provided a modulation circuit (9) and a signal processing circuit (2) on the same chip. The modulation circuit (9) modulates an input signal (30) to apply it to a selector (8). The...
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5208803 |
Circuit for testing digital lines
A digital test card for testing the quality of a digital system in a central office system is disclosed. Where the digital system consists of a digital line card connected to a customer premise...
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5204862 |
TDM slot muting method and apparatus
In a communications system network that comprises a plurality of communication systems and a processing multiplexer, a method and apparatus for selectively muting particular signal sources of a...
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5189637 |
Method and apparatus for preventing erroneous echoelimination and equalization
In a telecommunication system, erroneous echo-elimination and equalization resulting from non-linearities of a D/A-converter and an A/D-converter are prevented. An error signal (e n ) updates an...
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5187809 |
Dual mode automatic gain control
A gain control system for controlling signal levels of the signal received by a receiver. The gain control system is operable to control the signal levels of the signal when the signal is comprised...
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5185735 |
Lan noise monitor
An apparatus and method for monitoring voltage on a LAN cable on which data is conveyed by negative-going pulses. Positive voltage on the LAN cable is interpreted as noise. Positive voltage is...
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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...
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5157665 |
Integrated services digital network (ISDN) test device
A portable, hand-held test device which is adapted to be utilized with Integrated Services Digital Network (ISDN) equipment and alternatively connected to either a Terminal Equipment (TE) device or...
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5124984 |
Access controller for local area network
An access controller for peer-to-peer communication networks which monitors the data packets transmitted between stations, determines when an access that needs to be controlled is being made, and...
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5101401 |
Polarity judging arrangement by using frame synchronization signals of a received signal
In order to judge whether a received digital signal has a true polarity or an inverted polarity, a polarity judging arrangement comprises first and second synchronization word detecting circuits...
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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...
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4999834 |
Communication method and apparatus
A method of communicating between a primary station and a secondary station wherein variable sized packets of information are transferred asynchronously (or in start/stop mode) between the primary...
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4996695 |
Arrangement for accessing and testing telecommunication circuits
An arrangement is provided for selectively accessing and testing a digital telecommunications circuit (1) without detriment to the integrity of a signal carried thereby. The arrangement comprises...
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4978953 |
Device for monitoring multiple digital data channels
A device for switching data channel signal lines of each of a number of data channels through modules having interconnection switching matrices, to a further device adapted to monitor the signal...
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4897836 |
Programmable connection path circuit
A multiplexing type circuit includes circuit portions having input and output leads associated therewith, to allow testing of the individual circuit portions, and further includes laser...
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4890102 |
Visual display for communication network monitoring and troubleshooting
A communication network transceiver assembly for interfacing between a communication bus and a host system includes a transceiver circuit for coupling data signals to and from the communication...
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4862458 |
Multiplexed built in test equipment
Built-in test equipment performs time out tests on a plurality of fast lines and a plurality of slow lines with respect to a short time interval and a long time interval respectively. The fast...
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4852082 |
Circuit arrangement for testing the operability of the data transmission facility
A circuit arrangement is provided for completely testing the operability of a data transmission facility which has a four-wire connected to a two-wire line via a hybrid and in which an echo...
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4829244 |
Bus and tag cable monitoring tap
A monitoring tap for accessing signals on bus or tag coaxial cables used to convey signals between a CPU an external devices is described. A circuit board carrying termination resistors for the...
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4794596 |
Data network synchronisation
In a data network comprising multiplexers (M/X(A) etc) connected together by data links (1,2,3), and having clock sources (MC(1) etc), each multiplexer is provided with a clock selector (CS(A)...
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4740964 |
Alarm indications signal detection apparatus
A circuit using the non-linear charge characteristics of a RC network to, in combination with a consecutive bit logic detector circuit, establish a given integrated output if the consecutive bit...
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4712209 |
Monitoring apparatus capable of monitoring a digital equipment by the use of a synchronization signal
In a monitoring apparatus for monitoring digital equipment including an on-line multiplexer for multiplexing a plurality of input signals into a single output signal, an on-line demultiplexer for...
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4682325 |
System for selectively coupling a plurality of stations into a single communications path
A system is disclosed for selectively serially coupling a plurality of stations in a communications network into a single communications path. In the system of the invention, a plurality of tap...
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4635247 |
High-speed burst signal monitoring device
A high-speed burst monitoring device for large capacity burst signal processing which constantly monitors receipt conditions of received burst signals in a time division multiplex access (TDMA)...
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4611320 |
Programmable testing analyzer
The invention relates to a transmission testing arrangement for executing performance tests for a telecommunication system which includes a central switch to the common control unit, a switching...
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4608683 |
Test apparatus for digital speech interpolator for use in time division multiple access scheme
An apparatus for testing the operation of a digital speech interpolator provided in a transmitting station and a receiving station in a time division multiple access scheme (DSI/TDMA). The...
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4598398 |
Test apparatus for PCM/FDM transmultiplexer
A device is described which utilizes an addressing circuit to output, from a memory device, stored digital samples of an analog sinusoid, in logarithmic form, to a level control circuit, which...
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4549049 |
Arrangement for testing a device provided with an echo canceller
The test arrangement is intended to test, for example, a modem whose transmitter and receiver are coupled to the transmission line by means of a hybrid junction and comprises an echo canceller. The...
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4455647 |
Apparatus for establishing multi-address connections
A digital data telecommunications system comprises a central switching system and a plurality of line terminators each connecting the switching system to a pair of incoming and outgoing lines and...
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4419751 |
Multiport modem and the use thereof in a method and a system for testing a multilevel communication network
A method of testing a communication network that comprises a first and a second multiport modem communicating with each other through a transmission channel, each of said modems being provided with...
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4374435 |
Passenger entertainment system transducer failure detector
Common seat group transducer BITE circuitry located within the seat group SEB is responsive to the audio signal output of each transducer driver amplifier, the transducer BITE circuitry sensing the...
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4361885 |
System for channel-specific releasing and blocking of telephone channels in converters of a time division multiplex system for pulse code modulation
The present invention relates to a system for channel-specific releasing and blocking of telephone channels in "outgoing" signaling converters and in "incoming" signaling converters of a pulse code...
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4316059 |
Gain controller for a teleconferencing bridge
A gain controller for normalizing signal levels from a plurality of remote stations connected to a teleconferencing bridge. Common monitoring circuitry is used to generate a clock signal, the...
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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...
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4311882 |
Method of and arrangement for testing traffic routes in telecommunication networks
One central unit (NQTC) provided per network section controls a number of remote units (NQTR) distributed over the network section by transmitting to them all data needed for a sequence of test...
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4185172 |
Method of and means for detecting digitized multi frequency-coded signals
Digitized samples of switching or supervisory signals in the form of specific frequency pairs, selected from n predetermined signaling frequencies, are received at a PCM terminal of a telephone...
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4161627 |
Method of and system for generating digital test signals
To test the performance of a PCM terminal operating in the TDM mode, a simulated message or noise signal is generated by extracting a recurrent sequence of code words from a read-only memory, the...
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3962646 |
Squelch circuit for a digital system
A digital system for receiving digital messages transmitted in a polybinary code having a squelch circuit for inhibiting operation of the system during improper operation, said squelch system...
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3952163 |
Method and apparatus for testing in FDM system
A data communication system is described in which dial access control signals such as RING, DATA SET READY, DATA TERMINAL READY, CARRIER DETECT, and OUT OF SERVICE are transmitted between a central...
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