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| Number | Title | Issue Date |
| 7302047 | Method of detecting remote ground condition Whether or not protection circuitry for a span-powered remote digital subscriber loop unit is properly connected to earth ground is determined by the deliberate assertion and detection of a ground fault from a central office line card location. The span-powered remo... | 11/27/2007 |
| 7260185 | Method and apparatus for gradual application of a hitless monitoring access to a communications circuit employing a guided transmission media A monitor access is gradually applied an removed from a communications circuit, including a digital subscriber line (DSL), by a gradual monitor access (GMA) technique, in which a variable impedance element is gradually applied to the communications circuit until the... | 08/21/2007 |
| 7149286 | Electrical system like a system for testing the channels of a communication system An electrical system is described comprising none or one or two function boards and at least one voltage converter. The function board/s and the voltage converter are connected such that a voltage generated by the voltage converter is supplied to the function board/... | 12/12/2006 |
| 7027587 | System and method for deriving sealing current An adaptive unit that taps into an existing POTS line, DLC POTS line, DLC channel unit designed for sealing current outputs, or AC-DC transformer designed for sealing current output, to provide sealing current to a DSL circuit thereby avoiding having to deploy a sep... | 04/11/2006 |
| 6999561 | Method of detecting remote ground condition Whether or not protection circuitry for a span-powered remote digital subscriber loop unit is properly connected to earth ground is determined by the deliberate assertion and detection of a ground fault from a central office line card location. The span-powered remo... | 02/14/2006 |
| 6876742 | High-voltage protection circuitry in a data access arrangement A data access arrangement (DAA) having improved surge protection. The DAA incorporates a high voltage clamping device functioning to protect line side circuitry from signal paths created by EMI capacitors. In one embodiment of the invention, EMI capacitors are added... | 04/05/2005 |
| 6628621 | Multichannel-capable bit error rate test system A bit error rate test (BERT) system is configured as a field programmable gate array that emulates multiple independent BERT generators. The BERT generators produce test frames containing test pattern codes associated with respectively different time divi... | 09/30/2003 |
| 6580783 | 2nd level power fault testing apparatus for testing telecommunications equipment A power fault testing apparatus for testing telecommunications equipment interfaces to Telcordia's 2nd Level AC power fault standards. The apparatus is powered by a three-phase 480 VAC, 600 A power service. A plurality of transformers, includin... | 06/17/2003 |
| 6574310 | Apparatus and method for a wide band spectral balance measurement A method and apparatus for testing telephone equipment for longitudinal balance. A signal generating circuit places a test signal at a certain frequency on the tip and ring wires of a telephone line. The telephone line is monitored and the signals on the ... | 06/03/2003 |
| 6563926 | Resetting surge protection in telephone line interface circuits A surge reset circuit used to automatically reset a surge protection circuit within a telephone line interface circuit. A sensor (e.g., a zenering device) advantageously generates a voltage level representing current draining out of the transient voltage ... | 05/13/2003 |
| 6535580 | Signature device for home phoneline network devices Signature apparatus and techniques that make home networking devices, e.g., in-Home Phoneline Network (herein referred to as "HPN") devices, isolation filters, network interface devices, etc., detectable by commercially available metallic loop termination... | 03/18/2003 |
| 6529598 | Method and apparatus for digital PABX detection and modem interface protection The line interface circuit of a modem to be connected to a standard RJ11 jack of a digital PBX (Private Branch Exchange) is used along with software routines resident in the modem to detect the presence of a PBX connected to the modem. Upon going off-hook... | 03/04/2003 |
| 6411680 | Telephonic apparatus and input device for telephonic apparatus A telephonic apparatus comprises terminals for connecting it to respective electric cables, telephonic circuitry, and a switch between the terminals and the circuitry. It also includes a sensor for detecting a DC voltage above a first level between said t... | 06/25/2002 |
| 6356624 | Method and apparatus for detecting and measuring foreign voltages A sensor capable of being coupled to a transmission line and monitoring a foreign voltage on the transmission line includes a voltage monitoring circuit. The voltage monitoring circuit is adapted to operate in a foreign voltage detection mode in response ... | 03/12/2002 |
| 6282271 | Modem protection device A device for protecting a modem against harmful telephone line signals or reversed polarity telephone line signals includes a telephone line interface couplable to a telephone line, a modem interface couplable to a modem communication port, a measurement ... | 08/28/2001 |
| 6212258 | Device for remotely testing a twisted pair transmission line A network interface device intended to be placed approximate to the customers equipment and remote from a central office of a telephone company ("TELCO"). The purpose of the network interface device is to allow the twisted pair transmission line between t... | 04/03/2001 |
| 6185083 | Protected telecommunication test adapter module A protected telecommunications test adapter for use in troubleshooting telephone networks. The test adapter plugs into an industry standard panel and provides access to the network wiring via an RJ11 connector or clip posts. The test adapter has a surge p... | 02/06/2001 |
| 6052061 | Circuit for switching a protection line between a common section and a channel section A circuit for performing a switching of a protection line between a common section and a channel section includes a common section and a channel section connected by signal lines. The common section has a working interface circuit and a protecting interfa... | 04/18/2000 |
| 5887051 | Listening device for tracing line continuity and detecting telephone dial tone A pocket-size hand-held testing tool is provided for testing the operation of telephone lines and tracing the location of electric wires, including a sound signal channel with an output speaker, a dial tone detection circuit for detecting a dial tone on a... | 03/23/1999 |
| 5809109 | Integrated ring sensor with fault detection A power cross circuit detects a ring trip condition in order to switch a pair of switch relays to a protection circuit and to appropriate line driver circuitry to enable a talking condition for a telephone. The power cross circuit detects a rise in a DC c... | 09/15/1998 |
| 5777841 | Method of qualification testing of DC-DC converters DC--DC power converters are an integral and critical component of telecommunications products. As a key component, the reliability of these devices has direct impact on quality of the products. Many of the converters utilized in telecommunications product... | 07/07/1998 |
| 5644620 | Method of indicating a portable unit of a cordless telephone instrument out of operational area and its device A cordless telephone instrument is improved in that, even when a portable unit is not in use, it can be determined and notified to the user whether the portable unit is inside or outside of an operational area of the portable unit. In portable unit 2, por... | 07/01/1997 |
| 5390231 | Protection and recovery of telephone line interface circuits An automatic protection and recovery method for a telephone line interface circuit is described. The interface circuit monitors current on the line, and in the event of a fault producing an excessive current a protection relay interrupts a connection of t... | 02/14/1995 |
| 4947110 | Test apparatus to check conditions and characteristics of power and communication networks To permit checking or testing the condition of a network which may carry integrated services digital, the test apparatus includes a switch which has gauged switch terminals (S, U) to operate the apparatus in selective modes. The apparatus, further, includ... | 08/07/1990 |
| 4733320 | Line protection switch equipment A line protection switch equipment (LPSW) in a communication system, having a plurality of two-input and two-output switches connected between lines including a protection line and working lines, the switches being connected in series by a loop line which... | 03/22/1988 |
| 4720845 | Protective circuit for the overvoltage protection of a subscriber line interconnect circuit The invention describes a protective circuit for the protection of the electronic interconnect circuit (SLIC) and the electronic switches for test access, by means of a threshold setting element which is provided for each conductor (a,b) of a core pair fo... | 01/19/1988 |
| 4715058 | Protective circuit for the overvoltage protection of a subscriber line interconnect circuit A protective circuit for the electronic interface circuit (SLIC) as well as the electronic switches for test access is described, in which a first threshold setting element for each conductor of the core pair is connected between the line side and a test ... | 12/22/1987 |
| 4394543 | Telephone line holding circuit A telephone line holding circuit is disclosed which is adapted for temporary connection across a telephone line to maintain that line in a hold condition while line measurements and tests are being performed. The holding circuit is designed to be used ove... | 07/19/1983 |
| 4164632 | Signalling system for overvoltage protectors A system for signalling the fact that the fuses and limiting diodes in the connecting circuits of telephone lines are defective. Use is made of the rest supply resistors already present in the connecting circuits and the loop detector which is normally us... | 08/14/1979 |
