СПИСОК патентов США - подгруппа МПК16 H04M3/30
|
|
| № п/п | Номер патента | Название патента | |||
2017 | |||||
| 1 | 9584183 | Fault identification using line attenuations | |||
| 2 | 9584182 | Vectored DSL crosstalk cancellation | |||
| 3 | 9560181 | Communication apparatus and control method for the same | |||
| 4 | 9548914 | Estimating line rate | |||
| 5 | 9544423 | Channel ordering for multi-channel multi-carrier communication systems | |||
2016 | |||||
| 6 | 9526019 | Method and system for diagnostics and troubleshooting in home network deployments | |||
| 7 | 9503568 | Detecting dial tone on a telephone line | |||
| 8 | 9497316 | Data communication | |||
| 9 | 9491283 | Apparatus, systems and methods of common mode based diagnostics | |||
| 10 | 9490871 | Fault localisation | |||
| 11 | 9479912 | Transportable telecommunication interconnection device | |||
| 12 | 9479637 | Systems and methods for establishing a diagnostic transmission mode and communicating over the same | |||
| 13 | 9479223 | Method and apparatus in a communications network | |||
| 14 | 9462116 | Reducing the feedback overhead during crosstalk precoder initialization | |||
| 15 | 9460244 | Modular unit for stimulating performance in multi-lines digital subscriber line (xDSL) system | |||
| 16 | 9444921 | System to provide real loops for sidetone measurement with analog telephones | |||
| 17 | 9426283 | Method and apparatus of optimizing an xDSL transceiver configuration using single ended line test (SELT) measurement | |||
| 18 | 9426282 | Method and apparatus for transmission line testing | |||
| 19 | 9426268 | Method and apparatus for gauge identification based on single ended line testing (SELT) | |||
| 20 | 9420090 | Diagnostic methods for twisted pair telephone lines based on line data distribution analysis | |||
| 21 | 9413902 | Method and device for supplying power to access device | |||
| 22 | 9413539 | Analog front-end transmitter and a connection method of an X-digital subscriber line having a pre-distortion mechanism | |||
| 23 | 9407760 | Performance monitoring for discontinuous operation modes | |||
| 24 | 9401840 | Quality check identifying source of service issue | |||
| 25 | 9397781 | Method and apparatus for improving performance of transmit controlled adaptive modulation in xDSL and G.fast systems | |||
| 26 | 9391834 | Apparatus, systems and methods of common-mode rejection ratio based diagnostics | |||
| 27 | 9391744 | Method and apparatus for analyzing and mitigating noise in a digital subscriber line | |||
| 28 | 9374452 | Apparatus and method for detection of off-hook phone in reverse power feeding architecture | |||
| 29 | 9374132 | Communication system capable of measuring crosstalk in legacy line | |||
| 30 | 9356891 | Voice messaging interface | |||
| 31 | 9338282 | Data processing in a digital subscriber line environment | |||
| 32 | 9338281 | Method and apparatus for detecting and locating loop impairments | |||
| 33 | 9325859 | Method for optimising electrical consumption of a residential gateway | |||
| 34 | 9319512 | Systems and methods for establishing a diagnostic transmission mode and communicating over the same | |||
| 35 | 9312916 | Method and device for testing subscriber premises equipment | |||
| 36 | 9300525 | Method and system to identify a source of signal impairment | |||
| 37 | 9270813 | Pre-installation frequency domain premises wiring tests | |||
| 38 | 9270332 | Method for testing a component of a vectoring system and line termination equipment configured to carry out said method | |||
| 39 | 9264533 | Systems and methods for establishing a diagnostic transmission mode and communicating over the same | |||
| 40 | 9246614 | Methods and devices for transmission line analysis | |||
| 41 | 9241077 | Method and apparatus for DSL performance enhancement in a DSL network | |||
| 42 | 9239356 | Test board | |||
2015 | |||||
| 43 | 9225825 | Method and apparatus for line testing | |||
| 44 | 9215312 | Telecommunication diagnostic information management | |||
| 45 | 9210257 | Systems and methods employing time domain reflectometry | |||
| 46 | 9191496 | Digital subscriber line fault locating systems and methods | |||
| 47 | 9191495 | Systems and methods for communicating vectoring streams in multi-card vectoring groups | |||
| 48 | 9191066 | Systems and methods for loop length and bridged tap length determination of a transmission line | |||
| 49 | 9188621 | Impairments identification module and method | |||
| 50 | 9185204 | Method and apparatus for designing an improved transmit signal for use in a single ended line test (SELT) | |||
| 51 | 9178990 | Systems and methods for characterizing loops based on single-ended line testing (SELT) | |||
| 52 | 9178986 | Method and device for identification of an impairment within a telecommunication line | |||
| 53 | 9178777 | User-preference-based DSL system | |||
| 54 | 9166871 | Data communication | |||
| 55 | 9160841 | Device and method for detecting absence of a POTS splitter in a digital subscriber line | |||
| 56 | 9154638 | Data communication | |||
| 57 | 9154595 | Handheld subscriber line test equipment | |||
| 58 | 9148505 | Digital subscriber line identification method | |||
| 59 | 9148504 | Method and system for single-ended line testing | |||
| 60 | 9130854 | Measurement method | |||
| 61 | 9130655 | Methods and systems for detecting metallic faults affecting communications links | |||
| 62 | 9124723 | Method and device for data processing in a digital subscriber line environment | |||
| 63 | 9124683 | Diagnostic engine | |||
| 64 | 9106735 | Detection of wiring defects | |||
| 65 | 9088642 | Systems and methods for handling crosstalk vectoring failures in multi-card vectoring groups | |||
| 66 | 9083785 | Systems and methods selectively excluding tones from vectoring | |||
| 67 | 9071678 | Intelligent loop diagnostics for digital subscriber line services to support a service assurance system | |||
| 68 | 9065887 | Method, apparatus, and system for reducing power consumption on xDSL subscriber board | |||
| 69 | 9054794 | Detecting faults affecting communications links | |||
| 70 | 9054783 | Methods, apparatus, and articles of manufacture to trigger preemptive maintenance in vectored digital subscriber line (DSL) systems | |||
2013 | |||||
| 71 | 8571184 | Device and associated method for measuring crosstalk | |||
| 72 | 8515014 | Methods, apparatus and articles of manufacture to characterize customer-premises networks | |||
2007 | |||||
| 73 | 7286646 | Subscriber line validation of a telephone network | |||
2005 | |||||
| 74 | 6950497 | Fault location in a telecommunications network | |||
| 75 | 6947546 | Hook-flash simulation in parallel with off-hook devices | |||
| 76 | 6940949 | Ring, tip, ground testing tool | |||
| 77 | 6925173 | Optimization of a DSL-compatible POTS line card | |||
| 78 | 6915250 | Customer premises simulation for a service provider | |||
| 79 | 6914963 | Determining the composition of subscriber loops from frequency domain measurements | |||
| 80 | 6912269 | Test unit for use at a network interface device | |||
| 81 | 6904130 | Test unit for interface between telephone company demarcation point device and customer's telephone system | |||
| 82 | 6901358 | Communication media simulation for a service provider | |||
| 83 | 6901137 | Detecting faults in subscriber telephone lines | |||
| 84 | 6895081 | Predicting performance of telephone lines for data services | |||
| 85 | 6894504 | Technique for estimation of a subscriber line insertion loss | |||
| 86 | 6876725 | Single ended line probing in DSL system | |||
| 87 | 6873685 | Digital subscriber line access and network testing multiplexer | |||
| 88 | 6873684 | System and method for estimating the capacity of a local loop to carry data | |||
| 89 | 6870900 | Proactive maintenance application | |||
| 90 | 6870899 | ADSL loop qualification systems and methods | |||
| 91 | 6868060 | Circuit to provide backup telephone service for a multiple service access system using a twisted pair | |||
| 92 | 6865257 | Method for resolving trouble in a connection having a plurality of components | |||
| 93 | 6865221 | Systems and methods for loop length and bridged tap length determination of a transmission line | |||
| 94 | 6856683 | Method for reducing noise from a non-linear device that shares a customer loop with an asymmetric digital subscriber line modem | |||
2004 | |||||
| 95 | 6829330 | Systems and methods for loop characterization from double-ended measurements | |||
| 96 | 6829293 | Method and apparatus for line probe signal processing | |||
| 97 | 6826261 | Subscriber testing system | |||
| 98 | 6826258 | System and method for pre-qualification of telephone lines for DSL service using an average loop loss | |||
| 99 | 6826155 | Apparatus and method for facilitating standardized testing of signal lines | |||
| 100 | 6819745 | Method and apparatus of testing a POTS circuit and DSL circuit through a splitter | |||
| 101 | 6812827 | System and method for testing and maintaining a predetermined physical bit rate on a line connection | |||
| 102 | 6804328 | Intelligent line testing | |||
| 103 | 6801601 | Single ended line probing in DSL system using transformerless hybrid | |||
| 104 | 6801307 | Modular measuring or testing device | |||
| 105 | 6798830 | Methods and apparatus for generating a test signal for xDSL devices | |||
| 106 | 6788784 | Circuit arrangement for signaling in telecommunications networks | |||
| 107 | 6778931 | Test and measurement instrument having multi-channel telecommunications mask testing capability | |||
| 108 | 6771739 | Pressure alarms and reports system module for proactive maintenance application | |||
| 109 | 6765988 | Automated dispatching from a telephone cable air pressure monitoring system | |||
| 110 | 6763108 | Apparatus and method for line pair testing and fault diagnostics | |||
| 111 | 6763087 | Mobile VDSL signal detector | |||
| 112 | 6754309 | Communication device and access network device | |||
| 113 | 6751253 | Communication port-powered digital communication interface for upgrading software-reconfigurable test set | |||
| 114 | 6748050 | Method and apparatus for performing either tone analysis on a local looped-back communications path or utilizing a hybrid reflection based looped-back test to test integrity | |||
| 115 | 6744813 | System and method for estimating noise characteristics in the presence of non-stationary noise | |||
| 116 | 6741676 | Determining the physical structure of subscriber lines | |||
| 117 | 6738455 | Apparatus and method for testing subscriber lines and equipment | |||
| 118 | 6728648 | Test and measurement instrument having telecommunications mask testing capability with an autofit to mask feature | |||
| 119 | 6721394 | Method for reducing noise from an asymmetric digital subscriber line modem | |||
| 120 | 6718019 | Method and apparatus for wireline characterization | |||
| 121 | 6707886 | Method and system for testing subscriber loops using touchtone telephone signals | |||
| 122 | 6694015 | Universal line interface in telecommunications system | |||
| 123 | 6693992 | Line probe signal and method of use | |||
| 124 | 6690769 | Hand-held telecommunication loop testing device | |||
| 125 | 6690720 | Automated testing of modem training | |||
| 126 | 6687336 | Line qualification with neural networks | |||
| 127 | 6687289 | Method for measuring the attenuation in digital transmission lines | |||
| 128 | 6674840 | Systems and methods for verifying the provisioning of advanced intelligent network services | |||
2003 | |||||
| 129 | 6668059 | Telephone tuning and signaling system | |||
| 130 | 6668041 | Single ended line probing in DSL system | |||
| 131 | 6661850 | Testing system of voice-band data transmission interface on an exchange | |||
| 132 | 6658052 | Systems and methods for establishing a diagnostic transmission mode and communicating over the same | |||
| 133 | 6651189 | Communication network disturbance management method using top-down method | |||
| 134 | 6650732 | Telephony testing system | |||
| 135 | 6643266 | Method for qualifying a loop for DSL service | |||
| 136 | 6642926 | Test and measurement instrument having telecommunications mask testing capability with a mask zoom feature | |||
| 137 | 6639983 | Adaptable line driver interface for digital telephone systems | |||
| 138 | 6636841 | System and method for telecommunications system fault diagnostics | |||
| 139 | 6633642 | Balance network directional coupler system and method | |||
| 140 | 6633628 | Apparatus and method for selecting a supported signal path for a transceiver | |||
| 141 | 6631178 | System and method for transmitting data over loaded and unloaded twisted pairs | |||
| 142 | 6628754 | Method for rapid noise reduction from an asymmetric digital subscriber line modem | |||
| 143 | 6625255 | Apparatus and method for communications loop characterization | |||
| 144 | 6614881 | Remotely operable telecommunications conductor test circuit and method for using the same | |||
| 145 | 6614880 | Automated telephone line test apparatus with intelligent diagnostic function | |||
| 146 | 6611579 | Method for predicting and diagnosing trouble in a connection having a plurality of components | |||
| 147 | 6608885 | Method system and device for line monitoring | |||
| 148 | 6606719 | Method and arrangement to estimate transmission channel characteristics | |||
| 149 | 6606372 | System and method of testing an IDSL communications line | |||
| 150 | 6597782 | Method and apparatus for providing control and input sensing in a signal transfer point | |||
| 151 | 6594343 | Splitter bypass architecture for testing multiple ports | |||
| 152 | 6590962 | Method of performing non-interactive resistive fault location | |||
| 153 | 6584176 | Loop loss measurement and reporting mechanism for digital data services telephone channel equipment | |||
| 154 | 6584148 | System and method for testing digital subscriber lines | |||
| 155 | 6580782 | Interactive telephone response module | |||
| 156 | 6577711 | Methods for detecting defective communications lines | |||
| 157 | 6574310 | Apparatus and method for a wide band spectral balance measurement | |||
| 158 | 6574309 | Remotely actuated splittler bypass system and method | |||
| 159 | 6566889 | Line diagnostics for wireline modems | |||
| 160 | 6564227 | Customer support system | |||
| 161 | 6556661 | In-line telephony data protector with line condition announce | |||
| 162 | 6553105 | Enabling and powering of remotely actuated bypass splitters | |||
| 163 | 6549610 | Subscriber circuit having splitter disconnection function | |||
| 164 | 6538451 | Single ended measurement method and system for determining subscriber loop make up | |||
| 165 | 6535580 | Signature device for home phoneline network devices | |||
| 166 | 6535579 | Network interface device with disconnectable half-ringer | |||
| 167 | 6532216 | Central office based ADSL test platform | |||
| 168 | 6531879 | Method and apparatus for delay-line time-domain reflectometry | |||
| 169 | 6522731 | Data communication apparatus | |||
| 170 | 6519323 | Test unit for use at a network interface device | |||
| 171 | 6519322 | Apparatus and method for testing subscriber loop interface circuits | |||
| 172 | 6519320 | State monitoring method and apparatus in subscriber line test | |||
| 173 | 6516054 | Method for adjusting current levels, which have been falsified by offset-current levels, in a subscriber line circuit | |||
| 174 | 6516053 | System and method for testing telecommunication service installations | |||
| 175 | 6516049 | Method and apparatus for insertion loss estimation in wireline communications | |||
| 176 | 6507870 | xDSL web ordering tool | |||
| 177 | 6504906 | Telephone micro-tester and transport system | |||
2002 | |||||
| 178 | 6490342 | Method for quickly testing the operability of a subscriber circuit | |||
| 179 | 6487276 | Detecting faults in subscriber telephone lines | |||
| 180 | 6480575 | Structure and circuit topology for a remotely actuated bypass splitter | |||
| 181 | 6477238 | Loop certification and measurement for ADSL | |||
| 182 | 6470074 | System and method for providing data and voice services on a shared line | |||
| 183 | 6466650 | Telecom service identification transponder apparatus and technique | |||
| 184 | 6466647 | System and method for estimating the capacity of a local loop to carry data | |||
| 185 | 6463126 | Method for qualifying a loop for DSL service | |||
| 186 | 6459773 | System to pre-qualify copper subscriber loops for high bandwidth access service using subscriber or network generated tones | |||
| 187 | 6456694 | Method for prequalifying subscriber lines for high speed data service | |||
| 188 | 6453016 | Method and apparatus for detecting and locating a fault in a telecommunications environment | |||
| 189 | 6453015 | Telephony testing system | |||
| 190 | 6453014 | Test access and performance monitoring system and method for cross-connect communication network | |||
| 191 | 6445773 | DMT test method for determining ADSL capability of cables | |||
| 192 | 6442239 | Telephone line longitudinal balance tester and method | |||
| 193 | 6438212 | Automated telephone line test apparatus with intelligent diagnostic function | |||
| 194 | 6434221 | Digital subscriber line access and network testing multiplexer | |||
| 195 | 6418195 | Apparatus for communicating a diagnostic device with a telecommunications system through a remote network unit | |||
| 196 | 6418160 | Method for testing a communication channel | |||
| 197 | 6416352 | Telecommunication apparatus test module with deflectable circuit switching contact | |||
| 198 | 6411680 | Telephonic apparatus and input device for telephonic apparatus | |||
| 199 | 6393102 | Computer-executable method for diagnosing trouble causes in telephone cable segments when trouble data are available only for entire cables | |||
| 200 | 6389110 | Telecom service identification resonator apparatus and technique | |||
| 201 | 6389109 | Fault conditions affecting high speed data services | |||
| 202 | 6385299 | Line testing in a telecommunications network | |||
| 203 | 6385297 | Method and apparatus for qualifying loops for data services | |||
| 204 | 6385296 | System to test a connection in a telephone network | |||
| 205 | 6373923 | Line testing method and apparatus therefor | |||
| 206 | 6373259 | Connector testing system having a test prong including a projection | |||
| 207 | 6366644 | Loop integrity test device and method for digital subscriber line (XDSL) communication | |||
| 208 | 6356624 | Method and apparatus for detecting and measuring foreign voltages | |||
| 209 | 6349130 | Method to pre-qualify copper loops for ADSL service | |||
| 210 | 6347075 | Circuit to provide backup telephone service for a multiple service access system using a twisted pair | |||
| 211 | 6343114 | Remotely addressable maintenance unit | |||
| 212 | 6341159 | Extrapolation of location and amplitude of noise sources on telecommunication wireline from ended access point | |||
2001 | |||||
| 213 | 6330306 | Test device for telephone lines | |||
| 214 | 6320939 | Remote telephony testing device | |||
| 215 | 6301337 | Combined handset and POTS filter | |||
| 216 | 6301227 | Systems and methods for allowing transmission systems to effectively respond to automated test procedures | |||
| 217 | 6298118 | System and method for processing of communication line test signals, such as enhancement processing | |||
| 218 | 6295339 | Audio verification of digital subscriber line connection | |||
| 219 | 6292540 | Battery injection and loop supervision for DSL environment | |||
| 220 | 6292539 | Method and apparatus for digital subscriber loop qualification | |||
| 221 | 6285744 | Telephony test system with adjustable output impedance | |||
| 222 | 6285194 | Customer bridge with built-in test access | |||
| 223 | 6282277 | Unbundling device and method for connecting a competing local exchange carrier (CLEC) to the subscriber loop of a local exchange carrier (LEC) | |||
| 224 | 6278769 | Signaling method for invoking a test mode in a network interface unit | |||
| 225 | 6275571 | System for direct suppressed ringing access of subscriber lines | |||
| 226 | 6266395 | Single-ended subscriber loop qualification for xDSL service | |||
| 227 | 6266326 | Apparatus for loop testing in a communication system | |||
| 228 | 6263076 | Arrangement in a subscriber line interface circuit | |||
| 229 | 6263068 | Remote subscriber line unit provisioning system for use with voice communication facilities | |||
| 230 | 6259676 | Upgrading of subscriber connection | |||
| 231 | 6256377 | Loop loss measurement and reporting mechanism for digital data services telephone channel equipment | |||
| 232 | 6252942 | Wireless butt set | |||
| 233 | 6246748 | Power feeding system using two-wire subscriber lines | |||
| 234 | 6233312 | Inter-circuit line fault location in telecommunication networks | |||
| 235 | 6219406 | Back wiring board and aggregated device | |||
| 236 | 6215855 | Loop certification and measurement for ADSL | |||
| 237 | 6215854 | Digital signal processor-based telephone test set analyzing and displayed multiple signal parameter data for terminal mode and line monitor mode operation | |||
| 238 | 6212258 | Device for remotely testing a twisted pair transmission line | |||
| 239 | 6209108 | Method for testing VDSL loops | |||
| 240 | 6201853 | Telephone technician's remote assist apparatus and method | |||
| 241 | 6185280 | Line impedance matching using dynamically generated transfer functions | |||
| 242 | 6185191 | Testing of ISDN line via auxiliary channel signaling | |||
| 243 | 6185083 | Protected telecommunication test adapter module | |||
| 244 | 6181775 | Dual test mode network interface unit for remote testing of transmission line and customer equipment | |||
| 245 | 6173040 | Telephone line state detecting device | |||
| 246 | 6169785 | Apparatus and method for testing subscriber line | |||
| 247 | 6169784 | Telecommunication line termination test | |||
| 248 | 6169783 | Line testing in a telecommunications network | |||
2000 | |||||
| 249 | 6144722 | System and method for programmable telephone subscriber line test in ring mode | |||
| 250 | 6144721 | Apparatus and method for line pair testing and fault diagnostics | |||
| 251 | 6129575 | Testing system for a connector with a self-sealing connector housing | |||
| 252 | 6128753 | Fault management system for a telecommunications network | |||
| 253 | 6125458 | Fault management system for a telecommunications network | |||
| 254 | 6115355 | Reprovisioning monitor | |||
| 255 | 6111936 | Method and apparatus for automatically detecting and measuring distortion in a DSL system | |||
| 256 | 6108404 | Method and system for testing a connection in a telephone network using interactive telephone response module | |||
| 257 | 6084945 | Perfected protection and cutting unit by rotational control device, for connection and testing modules of telephone lines | |||
| 258 | 6058161 | System and method for programmable telephone subscriber line test | |||
| 259 | 6055299 | Connector block with built-in array test feature | |||
| 260 | 6039578 | Network interface device for line testing | |||
| 261 | 6038303 | Method and apparatus for remotely activating services in a telecommunications network | |||
| 262 | 6026146 | Automated voice terminal protocol identification system | |||
| 263 | 6026145 | Method and apparatus for fault segmentation in a telephone network | |||
| 264 | 6014425 | Apparatus and method for qualifying telephones and other attached equipment for optimum DSL operation | |||
1999 | |||||
| 265 | 6008654 | Method and apparatus for testing lines in a telecommunications network | |||
| 266 | 6002746 | Line testing in a telecommunications network | |||
| 267 | 6002671 | Test instrument for testing asymmetric digital subscriber lines | |||
| 268 | 5999593 | System and method for automatic PBX detection | |||
| 269 | 5995617 | Connector block mountable connector and telephone circuit | |||
| 270 | 5982815 | Circuit for setting a device into a test mode by changing a first port to a fixed clock and a second port to a non-fixed clock | |||
| 271 | 5978449 | Qualifying telephone line for digital transmission service | |||
| 272 | 5974363 | Self-testing of smart line cards | |||
| 273 | 5974115 | System and method for testing subscriber lines and terminating equipment from a service platform | |||
| 274 | 5966439 | Modular telephone line connecting disconnecting and testing block | |||
| 275 | 5956386 | Telephone subscriber line diagnostics system and method | |||
| 276 | 5956385 | Test set interface for automatically detecting line type | |||
| 277 | 5937034 | Method for testing call waiting, caller ID functionality of telephone line | |||
| 278 | 5937033 | Telephone system diagnostic measurement system including a distant terminal drop test measurement circuit | |||
| 279 | 5933479 | Remote service system | |||
| 280 | 5930334 | Method and apparatus for monitoring the operation of telecommunications equipment | |||
| 281 | 5917885 | Method and system for testing subscriber circuits and wiring in a cable communication system | |||
| 282 | 5912960 | Method and apparatus for remotely activating services in a telecommunications network | |||
| 283 | 5912629 | Subscriber interface control method | |||
| 284 | 5907614 | High density telephone network interface unit | |||
| 285 | 5903624 | Data terminal for telephone circuits | |||
| 286 | 5901201 | Switch-based line continuity verification method and system | |||
| 287 | 5901024 | Apparatus and method for circuit protection | |||
| 288 | 5898921 | Monitoring of the operation of a subscriber unit | |||
| 289 | 5896569 | Wireless access to telephone network dial tone | |||
| 290 | 5892756 | Portable telecommunication network testing device | |||
| 291 | 5889837 | Testing a subscriber terminal of a wireless telecommunications system | |||
| 292 | 5887051 | Listening device for tracing line continuity and detecting telephone dial tone | |||
| 293 | 5881130 | Fast and noise-insensitive load status detection | |||
| 294 | 5875245 | High voltage detection circuit, bell signal detection circuit and non-ringing reception detection circuit | |||
| 295 | 5875230 | Interactive measurement system and method for telecommunication networks | |||
| 296 | 5870451 | Method and apparatus for high impedance ringer detection | |||
| 297 | 5864602 | Qualifying telephone line for digital transmission service | |||
| 298 | 5862200 | Ground fault detector for T1 span equipment | |||
| 299 | 5857011 | Multi-port caller ID-based telephone ringback test device | |||
1998 | |||||
| 300 | 5843028 | Multi-lumen endoscopic catheter | |||
| 301 | 5841836 | Network termination equipment | |||
| 302 | 5832071 | Electronic patching system for telecommunications devices | |||
| 303 | 5832058 | Test interface adapter emulating no test trunk interface for non-standard central office switch | |||
| 304 | 5828728 | Telecommunications network | |||
| 305 | 5825849 | Loop-back test system using a suppressed ringing connection | |||
| 306 | 5818926 | Switching device for telecommunications channel | |||
| 307 | 5818905 | Subscriber line impedance measurement method and measuring circuit | |||
| 308 | 5809109 | Integrated ring sensor with fault detection | |||
| 309 | 5802143 | Identification of damaged cable pairs in a telecommunications network and restoration of telephone service to subscribers | |||
| 310 | 5799060 | Multi-port caller ID-based telephone ringback test device | |||
| 311 | 5796718 | Method of and system for intelligent access line protect switching | |||
| 312 | 5788681 | Multi-lumen endoscopic catheter | |||
| 313 | 5778050 | Portable line test telephone | |||
| 314 | 5777558 | Method for detecting fraudulent use of a communication system | |||
| 315 | 5774524 | Telephone test device and method of the same for optical cable television system | |||
| 316 | 5774316 | Ground fault detector for line-powered telephone network | |||
| 317 | 5768341 | Communications channel testing arrangement | |||
| 318 | 5764726 | Telecommunications test system including a test and trouble shooting expert system | |||
| 319 | 5754624 | Telephone line test kit | |||
| 320 | 5737389 | Technique for determining a compression ratio for use in processing audio signals within a telecommunications system | |||
| 321 | 5726853 | High voltage protection circuit for telephone test set | |||
| 322 | 5724421 | Telephone network interface apparatus | |||
| 323 | 5722850 | Telecommunications connectors | |||
| 324 | 5721773 | Lightning protected maintenance termaination unit | |||
| 325 | 5719917 | Circuit for activating back-up lines | |||
| 326 | 5717736 | Testing circuit and method for a codec hybrid balance network | |||
| 327 | 5710808 | Telephone dialling code processor | |||
1997 | |||||
| 328 | 5703929 | Wireless-wireline communication selection mechanism resident in craftsperson's portable test and communications device | |||
| 329 | 5699402 | Method and apparatus for fault segmentation in a telephone network | |||
| 330 | 5696809 | Advanced intelligent network based computer architecture for concurrent delivery of voice and text data using failure management system | |||
| 331 | 5692925 | Modular plug comprising circuit elements | |||
| 332 | 5687214 | Method and apparatus for remote maintenance procedures | |||
| 333 | 5685741 | On demand plug-in jack card and monitor frame | |||
| 334 | 5677941 | Channel test unit | |||
| 335 | 5673255 | Apparatus for providing service to telephone subscribers connected to a remote terminal from multiple telephone service providers | |||
| 336 | 5671273 | Network interface device having switch | |||
| 337 | 5661776 | Method and apparatus for performing impedance measurements on a communication line | |||
| 338 | 5659570 | Circuit and method for loopback test and on-hook transmission integrated in a telephone subscriber line interface circuit | |||
| 339 | 5652575 | Maintenance termination unit for telephone circuits | |||
| 340 | 5651048 | Communication channel switching arrangement | |||
| 341 | 5644617 | Method and apparatus for testing cables | |||
| 342 | 5638440 | Protection circuit for telephone systems | |||
| 343 | 5636262 | Interface scanning circuit | |||
| 344 | 5636260 | Telecommunication customer interface | |||
| 345 | 5625667 | Method of predicting voltages in telephone line measurement | |||
| 346 | 5621782 | Test interface adapter emulating on test trunk interface for non-standard central office switch | |||
| 347 | 5617466 | Mechanism for controllably enabling test set to assert off-hook condition on telephone line in dependence upon detection of prescribed voltage level and absence of data traffic | |||
| 348 | 5615225 | Remote measurement unit containing integrated line measurement and conditioning functionality for performing remotely commanded testing and conditioning of telephone line circuits | |||
| 349 | 5606592 | Method and apparatus for analyzing resistive faults on telephones cables | |||
| 350 | 5604785 | Remotely actuated switch and protection circuit | |||
| 351 | 5602750 | Administrative computer and testing apparatus | |||
| 352 | 5600716 | Customer-accessible test port for network interface device | |||
| 353 | 5596623 | Testing and complaint accepting communication unit | |||
| 354 | 5596568 | Apparatus for protecting a telecommunications network from false alarm conditions due to T1 line signal interruption | |||
| 355 | 5592528 | Battery charging and signalling interconnect arrangement for craftsperson's | |||
1996 | |||||
| 356 | 5586111 | In-line test switch for communications network | |||
| 357 | 5583912 | Wireless - wireline communication selection mechanism resident in craftsperson's portable test and communications device | |||
| 358 | 5572397 | Combined overvoltage station protector apparatus having maintenance termination and half ringer circuitry | |||
| 359 | 5572348 | Universal demarcation point | |||
| 360 | 5568547 | Subscriber circuit provided with a circuit for monitoring a subscriber instrument | |||
| 361 | 5559854 | Subscriber's line testing apparatus | |||
| 362 | 5550894 | Device for sequentially altering a communication line for remote diagnostic checks | |||
| 363 | 5544235 | Identification of called directory number at multiple directory number per line premises prior to ringing signal reception | |||
| 364 | 5533093 | Automated trouble-shooting mechanism resident in craftsperson's portable test and communications device | |||
| 365 | 5528662 | Active strapping and switching device for telephone line testing | |||
| 366 | 5528661 | Diagnostic mechanism for monitoring operational status of remote monitoring and test unit which controllably test and conditions subscriber line circuits | |||
| 367 | 5528660 | Display-based control mechanism resident in portable test and communications device for facilitating craftsperson's remote testing of selected portion of telephone network | |||
| 368 | 5524043 | Remotely connectable maintenance termination unit | |||
| 369 | 5521959 | Programmable source for supplying controllably variable AC/DC voltage output for telephone line measurement apparatus | |||
| 370 | 5521958 | Telecommunications test system including a test and trouble shooting expert system | |||
| 371 | 5515398 | Modem line probing signal techniques | |||
| 372 | 5511108 | Apparatus and method for performing and controlling testing of electrical equipment | |||
| 373 | 5504801 | User-controlled electronic modification of operating system firmware resident in remote measurement unit for testing and conditioning of subscriber line circuits | |||
| 374 | 5504753 | Control method for a testing system | |||
| 375 | 5504736 | Non-invasive link monitor | |||
| 376 | 5483573 | Electric circuit connector with auto-termination | |||
1995 | |||||
| 377 | 5471517 | Subscriber system testing method | |||
| 378 | 5465287 | Subscriber line impedance measurement device and method | |||
| 379 | 5452339 | Local/remote modification of electronically alterable operating system firmware resident in redundant flash memory of remote unit for testing/conditioning subscriber line circuits | |||
| 380 | 5450469 | Subscriber interface box | |||
| 381 | 5450468 | Method of rapidly assessing damage to outside loop plant | |||
| 382 | 5444759 | Method of predicting voltages in telephone line measurement | |||
| 383 | 5442679 | Apparatus for use in isolating the cause of a dropped telecommunication call | |||
| 384 | 5442519 | Device including a maintenance termination unit and protector | |||
| 385 | 5440612 | Method and device for measuring operation parameters of telephone subscriber lines and associated interface circuits | |||
| 386 | 5440610 | Mechanism for controlling operation of telephone metallic loop measurement device in dependence upon rate of settling of telephone line voltage | |||
| 387 | 5440609 | Telephone tester junction box | |||
| 388 | 5438606 | Open power loop detector for transmission line elements | |||
| 389 | 5436968 | Digital data-dependent ac impedance termination of telephone line | |||
| 390 | 5436953 | Digital longitudinal balance measurement | |||
| 391 | 5432705 | Administrative computer and testing apparatus | |||
| 392 | 5425075 | Multipurpose analog telephony channel test facility method and apparatus | |||
| 393 | 5420920 | Network interface device module providing sealed customer-accessible test port | |||
| 394 | 5418834 | Maintenance termination units | |||
| 395 | 5416825 | Testing method for subscriber line testing | |||
| 396 | 5414765 | Network interface device having switch | |||
| 397 | 5404388 | Digital measurement of amplitude and phase of a sinusoidal signal and detection of load coil based on said measurement | |||
| 398 | 5402465 | Telephone trouble isolator | |||
| 399 | 5402073 | Near-end communications line characteristic measuring system with a voltage sensitive non-linear device disposed at the far end | |||
| 400 | 5400321 | Central monitoring system of a multiplex subscriber loop carrier | |||
| 401 | 5393235 | Telecommunications test adapter | |||
| 402 | 5392327 | Termination unit with maintenance facility | |||
1994 | |||||
| 403 | 5377259 | Data terminal having program language support library, and related method | |||
| 404 | 5369690 | Telephone call detecting circuit and a method of remotely accessing and testing a telephone | |||
| 405 | 5363442 | Retrofit interface apparatus and method for remote isolation devices | |||
| 406 | 5361293 | Line/drop testing from a craft terminal using test unit | |||
| 407 | 5357556 | System and method for telephone network testing | |||
| 408 | 5353327 | Maintenance termination unit | |||
| 409 | 5345496 | Remote line test facility | |||
| 410 | 5332397 | Test cord apparatus | |||
| 411 | 5309499 | Communications line testing | |||
| 412 | 5307398 | Remote controlled tone generator system | |||
| 413 | 5301050 | Subscriber loop testing in a fiber-to-the-curb communications network | |||
| 414 | 5297975 | Terminal bank for the telecommunication and data technology | |||
| 415 | 5296850 | Apparatus and proceses for mapping the connectivity of communications systems with multiple communications paths | |||
| 416 | 5285100 | Semiconductor switching device | |||
1993 | |||||
| 417 | 5274692 | Method for testing the line connection before switching from a telephone switching center to be placed out of service to a new digital telephone switching center to be placed into service | |||
| 418 | 5265156 | Digital signal cross-connect panel | |||
| 419 | 5260994 | Maintenance termination unit module | |||
| 420 | 5235629 | Apparatus for telephone line checking | |||
| 421 | 5222119 | Communication system and a method, to detect a power exposure of a communication line | |||
| 422 | 5218616 | Telephone line tester | |||
| 423 | 5216702 | Nonintrusive speech level and dynamic noise measurements | |||
| 424 | 5195124 | Testing system for local subscribers | |||
| 425 | 5193107 | Speakerphone test set | |||
| 426 | 5187733 | Verification of subscriber lines prior to cutover to a new switching system | |||
1992 | |||||
| 427 | 5175662 | Device including an MTU and protector | |||
| 428 | 5170429 | Portable telecommunications test instrument with a talk battery circuit | |||
| 429 | 5163079 | Analog/digital telephone test set | |||
| 430 | 5157708 | Portable telecommunications test instrument with line condition monitoring | |||
| 431 | 5150402 | ISDN terminal having diagnostic function | |||
| 432 | 5128619 | System and method of determining cable characteristics | |||
| 433 | 5123041 | Apparatus for testing telephone cables | |||
| 434 | 5121420 | Automatic line defect detector | |||
| 435 | 5115462 | Remotely controlled apparatus for conditioning telephone line exclusive of metallic DC bypass pair | |||
| 436 | 5113426 | Ground fault detector | |||
| 437 | 5105438 | Remotely accessing intelligent network channel terminating equipment device | |||
| 438 | 5103473 | Telephone system communication mechanism employing central office sleeve lead | |||
1991 | |||||
| 439 | 5073920 | Method and apparatus of measuring a subscriber line | |||
| 440 | 5073919 | Automatically testing telephone lines | |||
| 441 | 5063585 | Telephone subscriber line fault detector | |||
| 442 | 5063584 | Method for testing subscriber's equipment | |||
| 443 | 5062131 | Telephone line monitoring circuit for providing a visual and auditory signal if the telephone line becomes inoperative | |||
| 444 | 5056131 | Telephone line monitoring circuitry and apparatus | |||
| 445 | 5054050 | Drop testing in fiber to the home systems | |||
| 446 | 5025466 | Telephone test instrument | |||
| 447 | 5005197 | Method and apparatus as for testing a telephone line interface card | |||
| 448 | 5001741 | Apparatus for testing and sparing linecard equipment in a telecommunications exchange | |||
| 449 | 4996702 | Apparatus for testing spare line circuits in a communication system | |||
| 450 | 4991196 | Testing communications systems | |||
| 451 | 4991195 | Apparatus and method for testing a telephone circuit protector | |||
| 452 | 4985917 | Personal artificial loop (p.a.l.) | |||
| 453 | 4982325 | Applications processor module for interfacing to a database system | |||
1990 | |||||
| 454 | 4969179 | Telephone line monitoring circuit for providing a visual and auditory signal if the telephone line becomes inoperative | |||
| 455 | 4962520 | Composite ringing and coin control voltage detector and method | |||
| 456 | 4945555 | Method and means for remote testing of unused telephone lines | |||
| 457 | 4943993 | Cable pair tester | |||
| 458 | 4939765 | Interlock circuit for preventing corruption of telephone line signals | |||
| 459 | 4937851 | Loop status verification system | |||
| 460 | 4937464 | Modular jack with loop testing switch | |||
| 461 | 4924489 | Customer line tester | |||
| 462 | 4922516 | Telephone technician's terminals with auto-selection of dial pulse on DTMF signalling | |||
| 463 | 4912755 | Line current test device | |||
| 464 | 4901004 | Apparatus and method for mapping the connectivity of communications systems with multiple communications paths | |||
1989 | |||||
| 465 | 4879739 | Wiring test device and method | |||
| 466 | 4870675 | Remote testing of metallic loops with a trans hybrid signal | |||
| 467 | 4864597 | Cable pair tester | |||
| 468 | 4862491 | Remote disconnection and short-circuiting apparatus and method | |||
| 469 | 4860332 | Apparatus for the automatic in-circuit testing of subscriber line interface circuits and method therefor | |||
| 470 | 4852145 | Telephone subscriber loop test system | |||
| 471 | 4847885 | System for measuring and automatically compensating for the distorsions of a connection between a telephone apparatus and a central voice processing unit | |||
| 472 | 4845737 | Method for measuring line parameters of subscriber lines of a telecommunication system | |||
| 473 | 4841560 | Direct access test unit for central office | |||
| 474 | 4841559 | Telephone network interface tester | |||
| 475 | 4837811 | Telephone technician's terminals | |||
| 476 | 4827497 | Electronic trigger switch for maintenance termination unit | |||
| 477 | 4825466 | Telephone interface security device | |||
| 478 | 4825458 | Subscriber telephone equipment test apparatus | |||
| 479 | 4815119 | Testing transmission links | |||
| 480 | 4807277 | Remotely activated switching apparatus | |||
| 481 | 4799251 | ESS equipment testing device | |||
| 482 | 4797622 | Technique for determining the values of circuit elements in a three terminal equivalent circuit | |||
| 483 | 4796289 | Multi-line network interface | |||
1988 | |||||
| 484 | 4791659 | Remote test telephone line access system | |||
| 485 | 4788710 | Telephone line selection and isolation method and apparatus | |||
| 486 | 4777645 | Telephone line test and display circuit | |||
| 487 | 4774722 | Telephone line activity monitoring method and device | |||
| 488 | 4774721 | Cable pair to telephone number verification system | |||
| 489 | 4771451 | Polarity ring director | |||
| 490 | 4766594 | Digital network system having arrangement for testing digital subscriber line | |||
| 491 | 4764950 | Snap-on network interface unit | |||
| 492 | 4764949 | Subscriber/craftsperson ringback apparatus | |||
| 493 | 4756017 | Telephone test device | |||
| 494 | 4754472 | Telecommunication systems | |||
| 495 | 4748652 | Circuit for detecting abnormality in feeder | |||
| 496 | 4748651 | Multiline transmission line test receptacle with provision for testing each line | |||
| 497 | 4741016 | Special service signal tester | |||
| 498 | 4729126 | Method and apparatus for supervising the accessing and testing of communication systems | |||
1987 | |||||
| 499 | 4710949 | Telephone line fault locating device | |||
| 500 | 4709386 | Subscriber line monitoring circuit | |||
| 501 | 4707851 | Remote isolation test apparatus | |||
| 502 | 4707848 | Test set communication/interface system | |||
| 503 | 4701699 | Telephone station testing apparatus | |||
| 504 | 4700380 | Solid state remote actuable switch | |||
| 505 | 4691337 | Method and apparatus for determining the value of analog voltages occurring on telephone subscriber lines of a digital telephone exchange | |||
| 506 | 4691336 | Telephone test set having an auxiliary amplifier and speaker for permitting listening to line signals | |||
| 507 | 4686696 | Transmission line signal sensing circuit employing means for conserving power, especially for use with a telephone disconnect circuit, and associated method | |||
| 508 | 4685120 | Electronic trigger switch for maintenance termination unit | |||
| 509 | 4682347 | Telephone line selection and isolation method and apparatus | |||
| 510 | 4682346 | Telephone test set | |||
| 511 | 4682345 | Adapter for coupling together two subscribers' lines to a telephone test set | |||
| 512 | 4679224 | Telephone line testing circuit | |||
| 513 | 4675899 | Frequency ring director | |||
| 514 | 4670898 | Direct access test unit for central office | |||
| 515 | 4669112 | Automatic telephone number indicating device | |||
| 516 | 4669111 | Polarity ring director | |||
| 517 | 4663775 | Method and apparatus for testing remote communication systems | |||
| 518 | 4661969 | Communication lines with terminate and leave capability-VF data bridge | |||
| 519 | 4653084 | Remote actuated switch | |||
| 520 | 4647724 | Ringing interface card for telephone test equipment | |||
| 521 | 4645874 | Message routing through data communication networks | |||
| 522 | 4641299 | Mechanized loop testing using a local metallic access port | |||
| 523 | 4639557 | Remote testing system for electrical circuits | |||
| 524 | 4639555 | Pair cut apparatus and method of use | |||
| 525 | 4636939 | Parallel bus protocol | |||
1986 | |||||
| 526 | 4631368 | Switching system for readily accessing the service line for test basic unit and the switching system for readily accessing the service line for test expansion unit | |||
| 527 | 4629836 | Method and apparatus for accessing communication systems | |||
| 528 | 4629835 | Fault isolating apparatus system and method | |||
| 529 | 4628158 | Stored program controller | |||
| 530 | 4626633 | In-line switched telephone line tester | |||
| 531 | 4626632 | Maintenance termination unit | |||
| 532 | 4622438 | Subscriber line radio concentration system with automatic response for a loop back test | |||
| 533 | 4620070 | Telephone line tester | |||
| 534 | 4620069 | Method and apparatus to determine whether a subscriber line is loaded or non-loaded | |||
| 535 | 4614844 | Telephone service checking terminal | |||
| 536 | 4611101 | Method and apparatus for testing communication systems | |||
| 537 | 4605827 | Line fault discriminator | |||
| 538 | 4602338 | Impedance measurement in 4-wire to 2-wire converters | |||
| 539 | 4600810 | Telephone line tester | |||
| 540 | 4594704 | Spare subscriber terminal device in a digital concentrator | |||
| 541 | 4590583 | Coin telephone measurement circuitry | |||
| 542 | 4582960 | Subscriber network interface device | |||
| 543 | 4581494 | Telephone interface-test device | |||
| 544 | 4581493 | Line condition reporting system | |||
| 545 | 4578761 | Separating an equivalent circuit into components to detect terminating networks | |||
| 546 | 4575588 | Universal telephone test apparatus | |||
| 547 | 4570037 | Fault detection in a telephone cable pressure monitoring system | |||
| 548 | 4564728 | Apparatus for testing a telephone line | |||
1985 | |||||
| 549 | 4562436 | Data communication network | |||
| 550 | 4562313 | Electrical systems comprising temperature-sensitive devices | |||
| 551 | 4560842 | Telecommunication system loop-back unit | |||
| 552 | 4558188 | Arrangement for line jumper testing | |||
| 553 | 4558182 | Remotely-activated switching apparatus | |||
| 554 | 4554642 | Digital filtering with monitored settling time | |||
| 555 | 4550225 | AC Signal-activated switching apparatus | |||
| 556 | 4550223 | Test device, and method for locating faults in a two-lead line | |||
| 557 | 4544809 | Arrangement for subscriber line ring testing | |||
| 558 | 4544807 | Fault detector test instrument | |||
| 559 | 4543524 | Biased reactor maintenance termination unit | |||
| 560 | 4539652 | Networks for data communication | |||
| 561 | 4538033 | Data bridge with gating and/or testing | |||
| 562 | 4536706 | Magnetic current sensor | |||
| 563 | 4536617 | Remotely-activated switching apparatus | |||
| 564 | 4533864 | Test instrument with flexibly connected head | |||
| 565 | 4529847 | Maintenance termination unit | |||
| 566 | 4528427 | Test system and device for locating short circuits and open circuits in a two-lead line | |||
| 567 | 4525795 | Digital signal generator | |||
| 568 | 4525789 | Programmable network tester with data formatter | |||
| 569 | 4517513 | Magnetic differential current sensor | |||
| 570 | 4516070 | Magnetic current sensor with offset and load correction | |||
| 571 | 4513179 | Loop test circuit | |||
| 572 | 4496801 | Splicing module test set | |||
1984 | |||||
| 573 | 4489221 | Telephone line/subscriber equipment disconnect apparatus | |||
| 574 | 4489220 | Test set | |||
| 575 | 4488008 | Telephone network interface device | |||
| 576 | 4486627 | Cable load status detector | |||
| 577 | 4485271 | Remotely actuable line disconnect device | |||
| 578 | 4467149 | Compensation method and apparatus for use with nonideal test access lines | |||
| 579 | 4467147 | Switching network for interactive access and testing of subscriber loops | |||
| 580 | 4464621 | Test device for and method of locating faults in a two-wire line or for switching two-wire lines | |||
| 581 | 4459437 | Test system for locating breaks and short circuits in a two-lead line | |||
| 582 | 4459436 | Programmable tester for measuring network characteristics | |||
| 583 | 4454388 | Arrangement for subscriber line verification and ring testing | |||
| 584 | 4453049 | Arrangement for single line testing | |||
| 585 | 4453048 | Arrangement for subscriber line ring testing | |||
| 586 | 4451708 | Spare subscriber terminal apparatus | |||
| 587 | 4447679 | Subscriber line testing system | |||
| 588 | 4446341 | Mechanized testing of subscriber facilities | |||
| 589 | 4446340 | Customer premises loop test unit powered from the normal central office power source | |||
| 590 | 4445007 | Remote testing of subscriber line interface circuits | |||
| 591 | 4440985 | Apparatus for determining the location of faults in a transmission line | |||
| 592 | 4440984 | Method of testing telephone cable pairs | |||
| 593 | 4438299 | On-line telephone troubleshooting apparatus | |||
| 594 | 4438298 | System for accessing and testing subscriber loops | |||
| 595 | 4434328 | Remotely actuated telephone instrument connection block having instrument lockout feature | |||
| 596 | 4424421 | Apparatus for testing subscriber carrier systems | |||
1983 | |||||
| 597 | 4415779 | Methods of and apparatus for testing telephone subscriber loop to locate a fault relative to a reference point | |||
| 598 | 4415778 | Subscriber telephone test set | |||
| 599 | 4413163 | Portable line tester for telecommunication system | |||
| 600 | 4404636 | Phasor impedance measuring test set | |||
| 601 | 4401861 | Semiconductor crosspoint linearizing arrangement | |||
| 602 | 4399333 | Telephone fault detection system | |||
| 603 | 4396809 | Maintenance termination unit | |||
| 604 | 4395651 | Low energy relay using piezoelectric bender elements | |||
| 605 | 4394543 | Telephone line holding circuit | |||
| 606 | 4392026 | Subscriber line testing system | |||
| 607 | 4388501 | Audio-visual line test termination device | |||
| 608 | 4386243 | Telephone test shoe having resilient latching means | |||
| 609 | 4385336 | Current supplying circuit with shorted-to-ground fault detecting function | |||
| 610 | 4373121 | Maintenance termination device | |||
| 611 | 4373120 | Line test termination device | |||
| 612 | 4369341 | Customer line test termination device | |||
| 613 | 4368363 | Audible line test termination device | |||
1982 | |||||
| 614 | 4355209 | Programmable line circuit | |||
| 615 | 4350849 | Varying impedance line test termination device | |||
| 616 | 4334129 | Telephone digital office cutover system | |||
| 617 | 4331913 | Precision negative impedance circuit with calibration | |||
| 618 | 4320338 | Methods of and apparatus for determining the capacitance of a transmission line by integrating line currents | |||
1981 | |||||
| 619 | 4301334 | Telecommunication subscriber line access circuit with ground key and insulation fault indication | |||
| 620 | 4292480 | Method and apparatus for locating telephones | |||
| 621 | 4270030 | Testing of subscriber loop pair gain systems | |||
| 622 | 4258236 | Remote telephone line switching and testing | |||
1980 | |||||
| 623 | 4218592 | Telephone analyzer for detection of clandestine devices | |||
| 624 | 4213013 | Telephone network/subscriber interface device | |||
| 625 | 4209671 | Method and apparatus for testing the tip-ring polarity of telephone receptacles connected in parallel to a non-working pair | |||
| 626 | 4197435 | Telephone line monitoring circuit and method | |||
| 627 | 4186282 | Method and apparatus for measuring telephone line characteristics | |||
| 628 | 4185174 | Method and apparatus for checking connection paths in a telephone exchange | |||
1979 | |||||
| 629 | 4173736 | Capacitance detecting system and method for testing wire connections | |||
| 630 | 4169220 | Telephone instrument connection block with remotely actuated line test | |||
| 631 | 4164632 | Signalling system for overvoltage protectors | |||
| 632 | 4143250 | Telephone isolation system | |||
| 633 | 4139745 | Telephone line test system | |||
1978 | |||||
| 634 | 4126771 | Telephone line lifting apparatus | |||
| 635 | 4117264 | Diode package for use with a central office connector module | |||
| 636 | 4113998 | Testing electrically conductive lines to determine electrical characteristics thereof | |||
| 637 | 4085298 | Measurement of current through a line subject to spurious high potentials | |||
| 638 | 4079210 | Ringing and testing control circuitry for communication systems | |||
| 639 | 4076971 | Subscriber line testing system | |||
1977 | |||||
| 640 | 4056687 | Decoupling control arrangement for auxiliary circuits coupled to telephone lines | |||
| 641 | 4054760 | Remote testing of telephone loops | |||
| 642 | 4054759 | Subscriber loop verification device and method | |||
| 643 | 4051333 | Tip and ring conductor voltage tester | |||
| 644 | 4045624 | Continuous monitoring in carrier telephone systems | |||
| 645 | 4041255 | Switching circuit for telecommunications lines | |||
| 646 | 4034162 | Telephone receiver-off-hook detector | |||
| 647 | 4034161 | Telephone receiver-off-hook detector | |||
| 648 | 4028507 | Apparatus for applying particular voltages to three-terminal circuits and measuring resulting current flows for the purpose of determining circuit characteristics | |||
| 649 | 4022989 | Telephone receiver-off-hook-and-in-use detector | |||
1976 | |||||
| 650 | 3983338 | Apparatus and method to test the condition of an electrical service line and to determine the presence and/or removal of electrical equipment connected to the line | |||
| 651 | 3976849 | Telephone wiring tester | |||
| 652 | 3973090 | Telephone number assignment record verification apparatus and method | |||
| 653 | 3969594 | Automated telephony testing and polling apparatus and system | |||
| 654 | 3959605 | Circuit for detecting loss of telephone line voltage | |||
| 655 | 3943305 | Telephone line control system | |||
| 656 | 3941950 | Telephone line testing instrument having a supervising capability | |||
| © 2017, ПАТ-Инфо, В.И. Карнышев
Дата формирования списка: 03.04.2017 | |||||