Quotables
"Everyone acquainted with the subject will recognize it as a conspicuous failure."
Henry Morton, president of the Stevens Institute of Technology ; Said in 1880 about the light bulb
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 4529979 | Remote return loop control in a data transmission system In a return loop control system in a data transmission system having data transmission units such as modems connected at opposite ends of a transmission line, a return loop being formed at one of the data transmission units by a command signal from the ot... | 07/16/1985 |
| 4525789 | Programmable network tester with data formatter A mechanized system distributing the access, test and communication functions to the point of testing, typically the centralized switching facility serving the telephone loops and equipment to be tested. Computer (200) stores information about each subscr... | 06/25/1985 |
| 4510594 | Loop-around testing facilities for a multiline protocol controller A communication method and digital multi-customer data interface for interconnecting a number of customer terminals to a main packet switching network of a local area data transport system that provides data communication services such as interactive vide... | 04/09/1985 |
| 4495618 | Digital switching network A digital switching network in an exchange having distributed control and a central switching network, the switching network comprising a plurality of independent planes, each of which is connected via inlet and outlet multiplex links to terminal units wh... | 01/22/1985 |
| 4486877 | Packet switching loop-around network and facilities testing A communication method and packet switching system in which packets comprising logical addresses and voice/data information are communicated through the system by packet switching networks which are interconnected by high-speed digital trunks with each of... | 12/04/1984 |
| 4431875 | Signalling and channel loop test circuits for station carrier telephone system A plural channel amplitude modulated station carrier telephone system having a special synchronous ring detector circuit located in a station or terminal at the subscriber's end of the transmission line for signaling an incoming call for the subscriber's ... | 02/14/1984 |
| 4406004 | Ring scheduling apparatus for a digital multiplexed telecommunication system A ring scheduling apparatus for use in a digital multiplexed telephone communication system. The apparatus utilizes a controller which sorts messages indicating which telephone lines are being rung and what frequency and DC signal level are required to ri... | 09/20/1983 |
| 4402075 | Step-by-step remote locating system for repeaters in a PCM link A step-by-step remote locating system for a digital bidirectional transmission link includes repeater pairs between a monitoring end equipment and a remote equipment. The monitoring equipment transmits remote location sequences and a locate end interrupti... | 08/30/1983 |
| 4393491 | Automatic self-test system for a digital multiplexed telecommunication system An automatic self-test apparatus for use in a digital multiplexed communication system and self-testing idle circuitry coupled to idle telephone lines. The apparatus utilizes a tone generator which generates digital words describing an analog test signal ... | 07/12/1983 |
| 4380810 | Loopback test A digital concentrator system for use with a plurality of digital carrier systems in the telephone subscriber loop plant is disclosed. The concentrator system comprises a central office terminal (100), a remote terminal (102), and an interconnecting digit... | 04/19/1983 |
| 4377822 | Test equipment for a teletex television receiver This test equipment permits a testing of the demodulator of a teletex television receiver. It consists of a digital test signal generator, the output of which is connected to the HF input of the television, and a receiver, the input of which is connected ... | 03/22/1983 |
| 4336610 | Method and an arrangement for address-free fault location by loop closure in message transmission links A method and an arrangement for the address-free fault locating by means of loop closure for a message transmission link which contains regenerating and/or amplifying intermediate stations in specific spacings provides that transmission links of this sort... | 06/22/1982 |
| 4334303 | Monitoring system for telecommunication links equipped with repeaters-regenerators Monitoring system for a forward and backward link equipped with two way repeaters-regenerators comprises a monitoring station including means for transmitting through the forward link information data and a low frequency control signal and for receiving t... | 06/08/1982 |
| 4303808 | Locating noise in communications systems An impulse noise source in a bidirectional submerged communications system is positionally located by detection apparatus at one end of the system which measures the time interval between the same impulse arriving twice at the one end of the system, first... | 12/01/1981 |
| 4279032 | Channel bank loop-around test arrangement and method A method of detecting analog signal degradations in channel bank apparatus. The apparatus interconnects a digital PCM line with a plurality of analog trunks by means of multiplex circuitry and a plurality of channel units each comprising a PCM-to-analog s... | 07/14/1981 |
| 4271513 | Method and apparatus for carrying out loopback test The present invention discloses a method for carrying out a loopback test in a data communication system having a first data communication station, a second data communication station and a transmission line connected therebetween. The first data communic... | 06/02/1981 |
| 4271514 | Loopback test for data transmission paths A data transmission path comprises a first and a second station, a first data transmission channel operative for synchronously transmitting data from the first to the second station in synchronism with a predetermined clocking schedule and at a respective... | 06/02/1981 |
| 4247934 | Testing system for data transmission paths A loopback testing system for an asynchronously operating fully duplex data transmission path comprising proximate and remote stations, a proximate-to-remote data transmission channel for transmitting data to the remote station at a relatively high maximu... | 01/27/1981 |
| 4196321 | Loopback test system A subscriber loop carrier system is disclosed for frequency multiplexing a plurality of subscriber channels on a single twisted metallic pair using frequency division techniques. Supervisory signaling is accomplished from the central office to a remote lo... | 04/01/1980 |
| 4170722 | Apparatus and method for remote testing of a loop transmission path A first network can be switched into and out of connection with a lowpass filter disposed at one of the two opposite carrier terminal ends of a loop transmission path employing a double-sideband carrier. When the filter and network are so connected, an os... | 10/09/1979 |
| 4161635 | Address verification system An address verification system is described for use in a communications system comprising a transmission path (14) having sequence of remote stations (1, 2, ... n) distributed therealong. After accessing the desired station, a loop-back (32) is establishe... | 07/17/1979 |
| 4127816 | Carrier detect and automatic loopback circuit A master station communicates with remote stations by respective transmit-receive pairs. Quadra-phase modulation is utilized, involving a carrier having two characteristic frequencies not present during bursts of a communicated signal, which bursts are kn... | 11/28/1978 |
| 4071704 | Service generator checking apparatus Service generator checking apparatus and a method in a telephone system operating in time frames each consisting of time slots. The apparatus sends a tone sample signal in one frame through a system interface having an input portion and an output portion,... | 01/31/1978 |
| 4059729 | Method and system for selectively accessing multiplexed data transmission network for monitoring and testing of the network A method and system for accessing data in a time division multiplex communication network at the multiplexed level without disturbing the transmission of the data. A multiplexed data stream containing a predetermined pattern of framing signals and subscri... | 11/22/1977 |
| 4039751 | Method and apparatus for closed loop testing of first and second modulators and demodulators A method and apparatus are disclosed for closed loop testing of first and second modulators and demodulators from the modulated signal side of the first modulator and first demodulator. During ordinary communication, the first modulator and second demodul... | 08/02/1977 |
| 4006320 | Fault locating system and method for transmission lines and repeater stations A communication system has at least one supervisory station and a large number of repeater stations spaced along a four-wire two-way transmission line. A number of repeater stations are selected at equal intervals along the line to have a coupling network... | 02/01/1977 |
| 3937882 | Full-duplex communication system on a two wire line The disclosed full-duplex communication system includes a pair of full-duplex modems, one at each end of a two wire circuit. Each of the modems includes a transmitter for transmitting over the two wire circuit a stream of synchronous data at a first carri... | 02/10/1976 |
