Abstract: Testing of pre-ringing signalling in a telecommunications network at customer's premises, for example, signalling to activate a caller display unit may be effected remotely. By establishing a test call through the network by way of a dial-back loop to a test telephone number, establishing a second call through the network to the required telephone and simulating pre-termination conditions at network termination, actual signalling tones at the network edge are monitored by corresponding apparatus to that present at customer premises.

Abstract: Method for replacing a first cable (1) by a second cable (2) between a first predetermined point (1a) and a second predetermined point (1b), comprising:a. the provision of first series impedance means (S1) close to the first end (2a) and second series impedance means (S2) close to the second end (2b) of the second cable (2), which first (S1) and second (S2) series impedance means can be switched between a state of high impedance value and a state of low impedance value;b. electrically connecting the second cable to the first cable (1) at the first (1a) and second (1b) points, during which operation both the first (S1) and the second (S2) series impedance means are kept in their state of high impedance value;c.

Abstract: A multi-ported, caller ID-based test unit, which may be installed in the central office of a public switched telephone network, is capable of determining the telephone number, subscriber name and various other information associated with the subscriber line used to access to the test device, and is operative to conduct various tests of a telephone circuit from which a call to the test device is placed. These tests include exercising a caller identification, call waiting class of service, testing the ability of the telephone circuit to receive incoming calls, and testing the operation of a message-waiting indicator of a telephone unit coupled to the telephone circuit, as well as the ability to conduct a data session with a remote terminal using the test unit's data port.

Abstract: The portable line test telephone of the present invention consists of the switching means to operate different kinds of tests, the high voltage generating means to measure telephone capacity and insulation resistance, the dialing means to call and the call circuit means to talk with a subscriber or the called. Accordingly, line operator can make direct tests and examine telephone capacity, earth, line disconnection, line cross, insulation resistance with calling and talking with a subscriber.

Abstract: An apparatus for testing the racks and installation wiring of telephone switch equipment takes the form of a module capable of insertion into the various slots of a particular rack configuration. The module includes a circuit board which terminates in a connector suitable for interconnection with a particular telephone switch system, and which receives a continuity testing subassembly useful in performing the desired testing. To this end, selected contacts (or pins) of the connector are coupled with a light emitting diode (LED) and a biasing circuit for operating the LED responsive to connection of the biasing circuit to ground. Each LED, and the biasing circuit, is provided with a suitable operating voltage which can either be derived from the rack which is being tested or a battery which is resident in the test apparatus.

Abstract: A telecommunication test system for a line to be tested includes a test measurement device coupling with the line. The test measurement device determines parameter measurement data from the line. A processor receives the parameter measurement data. A first communication path between the test measurement device and the processor transmits the parameter measurement data. The first communication path is a wireless path. A mobile facility communicates with the processor. The communications are via a second communication path which includes a primary wireless path and a back-up wireline path. A central office and a data test place various signals on the line being tested. A third communication path between the mobile facility and at least one of the central office and the data test center is provided. The third communication path includes a primary wireless path and a back-up wireline path.

Abstract: Disclosed is an electronic device that can communicate with a plurality of testing devices that utilize a plurality of communication formats. To accommodate the plurality of testing devices, the electronic device can be configured to communicate with external test equipment using multiple communication path configurations and multiple message protocols. An exemplary method of the present invention is a method of configuring an electronic device for communicating with either of a first or second testing device. The first and second testing devices use, respectively, first and second physical communication path configurations and first and second message protocols. As an initial matter, the method of the present invention includes identifying a presently-used testing device, the presently-used testing device comprising one of the first and second testing devices.

Abstract: An electrical test kit for testing a telephone line from the terminals at the customer's end of the line includes a circuit for testing line continuity without falsely indicating to the voltage source that a telephone call has been answered, a push-button selection switch and a parallel pair of light-emitting diodes connected in reverse polarity relative to each other for determining polarity of the telephone line, and test pads in parallel with the continuity test circuit for permitting the attachment of a voltmeter so as to determine the magnitude of the internal resistance of the telephone line.

Abstract: An electrical connector utilizing a circuit board assembly for providing straight-through electrical interconnection of data line pairs between two jacks, and for providing breakout terminals. The layout of the electrical connector is such that common mode rejection is improved and cross-talk between data line pairs is minimized. The electrical connector has a circuit board with conductors located on both the bottom and top surfaces of the circuit board. The conductors are serially coupled to test pads to form a straight-through connection between pin openings located at opposite ends of the circuit board. The test pads are located so that the pads representing data line pairs are adjacent one another. Location of the test pads allows the conductors representing data line pairs to be located in a close parallel relationship for at least part of the way along the circuit board.

Abstract: A telephone system coder/decoder (CODEC) having improved access for testing CODEC components and a method of testing a CODEC in which a test signal is not contaminated by passage through CODEC filters. Input test pads are positioned between the receive channel filters and the connection of the receive channel to the hybrid balance network, and an output test pad is positioned between the transmit channel filters and the connection of the transmit channel to the hybrid balance network. Test signals selectively applied to the test pads or to CODEC terminals indicate operation of receive programmable gain section, hybrid balance network frequency response, hybrid balance network echo cancellation, and the transmit buffer, buffer splitter and transmit programmable gain section in the transmit channel. The test signals do not go through the transmit and receive filters.

Abstract: A probe for use in sampling signals from a pair of telephone wires has two conductors that are separated from each other by an insulating material such as a circuit board. Each of the conductors has an overall size and has plural nonconductive interstices therein so as to reduce the capacitance of the probe. In one embodiment, each of the conductors is shaped like a comb having conductive strips. Each of the conductors could alternatively be shaped in a zig zag manner. The telephone wires are oriented parallel to the strips so as to enhance coupling therebetween. The probe can have plural channels thereon, such as two conductors on each side of the insulating material. The strips of one conductor are located in the gaps of the other conductor which on the same side of the insulating material. The probe can reduce common mode noise by being balanced. A grounded guard trace on each side of the insulating material snubs homogeneous electric fields.

Abstract: A portable communications unit contains both wireless and wireline communication capability, through a selected one of which a craftsperson may establish a communication path with a test system of a telephone office. The test system responds to commands supplied over the established communication path supplies messages to the user's communication unit for providing a user with information for controlling the operation of a test head that is connectable to a subscriber line. The communications unit has a contact-sensitive visual display, which converts touch inputs into control signals that are transmitted to the test system and through which information associated with the operation of the test system is presented to the user. The user's communication unit is operative, in response to a user's request for the establishment of a communication path between the communications unit and the test system, to attempt to place the communications unit in wireless communication with the telephone office.

Abstract: A modular plug assembly for convenient interconnection, analysis, impedance matching or testing of computer, communication, local area network or other electronic equipment. The assembly comprises a plug of physical configuration generally similar to the modular plugs used for terminating cables. The plug contains all circuit elements required to apply one or more specified signals to contacts of a modular jack formed in the electronic equipment upon insertion thereinto of the modular plug of the invention. The circuit elements are formed on a flexible substrate which is entirely contained within the plug assembly. Contact between the circuit and the contacts of the jack on the equipment is provided by a number of terminals which are inserted into recesses formed in the body of the plug and retained therein. The terminals comprise tangs which pierce conductors formed on the circuit board and which comprise contact surfaces for contacting the contacts of the jack.

Abstract: A telephone line tester includes a pin socket connector, a modular jack connector and a plurality of lines out. The telephone line tester can be connected to a telephone line at a modular jack interface, and alternatively, at a pin socket interface. Testing can be performed by accessing signals of the telephone line through the plurality of lines out. Testing can also be performed by accessing signals of the telephone line through the modular jack connector.

Abstract: A graphically configurable method and device for testing high-frequency (DS0, DS1, DS3, and SONET) communication networks is disclosed. The foregoing is accomplished by a microprocessor controlled test instrument configured through a graphical interface which selects signal paths and test parameters. The graphical interface intelligently presents the choices of paths and test parameters relevant for the current test configuration.

Abstract: The possibility of corrupting digital data traffic carried by a data line (powered or unpowered), by the connection of a telephone test set to the data line is effectively prevented by augmenting the telephone test set with a mechanism that prevents the test set from asserting an OFF-HOOK condition on the line, unless it has been determined that each of two conditions are satisfied. These conditions are: 1- that no digital data traffic is being carried by the line; and 2- that the electrical voltage condition of the line satisfies a prescribed minimum voltage level criterion. If either of these conditions is not satisfied, a switch circuit installed in the test set's connection path to the line is maintained in a default, open condition, so that it is effectively impossible for the line to be presented with an OFF-HOOK condition through operation of the test set. This default condition remains in effect until both criterion are fulfilled.

Abstract: To prevent entry of contaminants into a craft unit, each of a telephone signal connector (RJ11 jack) and DIN-type digital signalling link connector is replaced with a sealed, multi-pin plug/receptacle type connector which integrates the routing of both telephone communication signals and digital communication signals between the craft unit and an external device. When stored in a storage and battery-charging station, the craft unit is maintained in a communication-ready state, by providing each of the battery-charging holder and the portable craft unit with an additional multi-pin interconnect arrangement, that contains a charging path for the craft unit's internal battery, and a multi-pin signalling path. This multi-pin interconnect arrangement contains both a set of communication signalling pins and a set of terminal pins through which the internal battery of the portable craft unit is charged.

Abstract: A portable communications unit contains both wireless and wireline communication capability, through a selected one of which a craftsperson may establish a communication path with a test system of a telephone office. The test system responds to commands supplied over the established communication path supplies messages to the user's communication unit for providing a user with information for controlling the operation of a test head that is connectable to a subscriber line. The communications unit has a contact-sensitive visual display, which converts touch inputs into control signals that are transmitted to the test system and through which information associated with the operation of the test system is presented to the user. The user's communication unit is operative, in response to a user's request for the establishment of a communication path between the communications unit and the test system, to attempt to place the communications unit in wireless communication with the telephone office.

Abstract: An inductive amplifier for identifying and tracing wires includes a comb filter for nulling out 60 Hz. power line "hum", as well as harmonics of 60 Hz. The inductive amplifier includes a probe for sensing an input signal. The comb filter includes a time delay circuit for providing a delayed output signal that is delayed by 16.67 milliseconds, or one 60 Hz. cycle, compared to the input signal. The comb filter also includes an inverter circuit for providing an inverted output signal that is 180 degrees out of phase with the input signal. The comb filter further includes a summer for summing together the delayed output signal and the inverted output signal to null out harmonic components of 60 Hz. while passing other signals to the output of the comb filter. The nulling method may also use digital processing techniques rather than discrete circuit components.

Abstract: An inductive amplifier for identifying and tracing wires includes an automatic gain control feature for sensing the connection of butt set leads to the inductive amplifier and reducing the gain of the inductive amplifier in such instances to reduce the likelihood of instability or oscillations. The inductive amplifier includes a probe for sensing an input signal which is filtered and amplified for driving either an internal speaker or a speaker in the earpiece of an external butt set. The inductive amplifier includes circuitry for sensing that the leads of the butt set have been connected to the inductive amplifier, and for reducing the gain of the inductive amplifier by a factor of ten under such circumstances.

Abstract: A switchable order wire circuit installed in addition to a trunk connecting a master station which includes an exchanger and a dependent station in a telephone system. The order wire circuit includes a first telephone terminal located in the master station, a second telephone terminal located in the dependent station, and a pair of telephone lines connecting the first and second telephone terminals. The order wire circuit also includes a hooking detection system installed in the master station, for detecting a hooking operation of the second telephone terminal. In addition, a circuit for switching the telephone lines from the first telephone terminal to a public line when the hooking operation is specifically detected is included.

Abstract: A telephone service technician's portable computer has a trouble-shooting mechanism which analyzes craftsperson inputs, trouble ticket data, local and remote test data, and suggests a problem solving strategy. The system includes a trouble-shooting application engine, a knowledge database, and a shared, parameter database. The knowledge database contains rules and static parameters which define the characteristics and behavior of the application engine. These rule sets and information are telephone line trouble-shooting specific, based on a diagnostic evaluation of possible line problems, and recommended procedures to repair the line and remove the fault. The shared database data may be supplied from a variety of external sources, such as through a work order manager software application, measurement data sourced by portable test equipment, or data input by the craftsperson.

Abstract: A portable, digital processor-based system equips a craftsperson with the ability to test a subscriber line of a telephone network by accessing a direct test unit (DATU) of a telephone office, said DATU being configured to respond to commands from a telephone test set and to generate audio messages that provide the user with information relating to control of the operation of the test unit for testing a subscriber line, said portable, digital processor-based system having an input/output device, including a visual display, through which information input by the user is converted into tone signals and transmitted to said DATU, and through which information associated with the operation of said DATU is presented by said test device to the user. The displayed information is interactively updated in response to one or more inputs supplied via the input/output device by the user, irrespective of the generation of audio messages by the DATU.

Abstract: A telecommunication test system for a line to be tested includes a test measurement device coupling with the line. The test measurement device determines parameter measurement data from the line. A processor receives the parameter measurement data. A first communication path between the test measurement device and the processor transmits the parameter measurement data. The first communication path is a wireless path. A mobile facility communicates with the processor. The communications are via a second communication path which includes a primary wireless path and a back-up wireline path. A central office and a data test place various signals on the line being tested. A third communication path between the mobile facility and at least one of the central office and the data test center is provided. The third communication path includes a primary wireless path and a back-up wireline path.

Abstract: A circuit for simulating the transmission characteristics of lines carrying digital signals, such as bus lines in ISDN networks. A partial line simulating device is assembled as a standard circuit including three different circuit parts in such a manner that any line design of any line length can be simulated.

Abstract: An administrative computer and testing apparatus device is provided. The administrative computer is coupled to the testing apparatus so that the test data can be correlated with administrative information such as the location of the equipment tested. The testing apparatus can be configured as a slice for insertion between upper and lower portions of the administrative computer. The administrative computer can control the testing apparatus to provide testing in accordance with predefined test procedures. The administrative computer is user-programmable to permit user-defined test procedures to be established. Test data, e.g. test data correlated with the location information, can be communicated to a remote computer for further processing or analysis. Communication can be implemented through a modem, which can be a land-line modem or an RF or other wireless modem.

Abstract: A connector unit (21) for automatically terminating a digital data services (DDS) line whenever a mating modular plug (30) is not inserted into the connector. The connector utilizes a switchable DDS jack (25) that mates with the modular plug (30) for connecting a data-transmit line and a data-receive line of a DDS network (41) to a customer's equipment (45). The connector unit has a maintenance termination circuit (40) with terminating impedances (r, r1, C and C1) and diodes (D and D1). When the plug and jack are not engaged, the maintenance termination circuit is connected to the data-transmit and data-receive lines via the normally closed jack contacts (33 and 34). As the plug and jack are engaged, the plug abuts against and, as movement continues, increasingly opens the jack contacts, causing the maintenance termination circuit to be disconnected from the customer's equipment and to be connected to the DDS network.

Abstract: A junction box for coupling alligator test clips to a modular telephone line. The device includes a housing having a plurality of contacts to which each alligator clip of a telephone testing apparatus may be connected. A female modular telephone receptacle is provided having a plurality of color-coded wires electrically coupled to the respective contacts. The contacts are each labeled in accordance with conventional telephone wire colors. The telephone testing apparatus may be easily coupled to a male modular telephone connector of the telephone line to be tested. The device eliminates the conventional practices of moving furniture to access telephone outlets, and disassembling telephones for access to internal contacts.

Abstract: An administrative computer and testing apparatus device is provided. The administrative computer is coupled to the testing apparatus so that the test data can be correlated with administrative information such as the location of the equipment tested. The administrative computer can control the testing apparatus to provide testing in accordance with predefined test procedures. The administrative computer is user-programmable to permit user-defined test procedures to be established. In one embodiment test data is provided to the administrative computer by using a memory buffer which can be written into by the test apparatus and can be read by the administrative computer. Test data, preferably test data correlated with the location information, can be communicated to a remote computer for further processing or analysis.

Abstract: A portable apparatus for demonstrating the operation of one or more telephones by simulating an active telephone line in which a ring tone generator (74), busy tone generator (72), dial tone generator (70), confirmation tone generator (146) and power ringer (52) are operationally controlled by a microprocessor (62) responsive to the on-hook and off-hook status of a telephone connected to the apparatus as well as control signals established by keypad entry or programmed operation. A decoder (64) responsive to DTMF or pulse dial signals provides for universal operation without regard to the type of telephones connected to the apparatus. Communications over the telephones can be monitored with an external speaker (38) or headphones, or recorded for later review. The apparatus also provides for simulated operation of coin-operated and calling card operated telephones.

Abstract: Disclosed is a network interface device for connecting network wiring to a subscriber's wiring at a subscriber's premises, the network interface device having a door covering a test jack, with means for connecting the network wiring to the subscriber wiring when the door is closed and connecting the network wiring to the test jack when the door is open.

Abstract: A manually-movable, portable, cellular-system signal-strength analyzer for measuring, recording and displaying geographically-located, downlink, cellular-communication-channel signal strengths in non-vehicular pedestrian areas and also inside buildings. The analyzer has a cellular-telephone scanning receiver housed within a backpack that is worn by a human operator who traverses the areas to be analyzed. A height-adjustable antenna mast formed from a set of telescoping tubes is fixed to the exterior of the backpack. This mast supports a self-resonant antenna of fixed length whose elevation height may be varied to determine signal-strengths at different pedestrian heights. The backpack also houses a controller. A laser rangefinder which has a built-in compass inputs data to the controller concerning the geographic locations of various points traversed by the analyzer. An arm-held computer is also connected to the controller.

Abstract: A data terminal which enables a craft technician to communicate through a gateway processor to other computers includes a program language support library and an operating system which can receive a condensed form applications program and supplement the received program to create a fully executable applications program. This permits convenient downloading into the terminal over a conventional telephone circuit. Also disclosed is an improved interface through which a telephone circuit can be tested to determine if it is active and idle in a substantially non-invasive manner. Respective computer protocols can be entered in the terminal in association with telephone numbers of respective computers for automatic use whenever the respective computer is called. A limited display area of the terminal is controlled so that a larger page of text can be sequentially displayed through it as if the limited display area is scanning across the larger page of text.

Abstract: The system has two units for transferring a telephone circuit from an old pair to a new pair between two locations. Each unit has a carrier amplitude measuring circuit to determine which location has the larger carrier amplitude and therefore which is the upstream location. Each unit has a charge switch, two transfer switches in the form of an old pair switch and a new pair switch and a controller for controlling the switches. One of the units closes its charge switch to charge the new pair to the dc level of the old pair. Then, the upstream unit operates its two transfer switches at the same time to switch from the old pair, by opening the old pair switch, to the new pair, by closing the new pair switch. The upstream unit transmits a signal to the downstream unit on a third pair. When the downstream unit receives the signal, it operates its two transfer switches at the same time to complete the transfer from the old pair to the new pair.

Abstract: Maintenance unit for modular public telephone, the unit being made up based on a microprocessor, a block for communication with the modular telephone, a rotating switch to take measurements and a condenser charger for the modular public telephone, with a rapid condenser charger to feed the modular telephone that will load the logic and the activators, allowing the unit to communicate through any telephone situated on a line protected by a validation and identification unit, and carrying out the same through the selection of the identification number on turning switches. The unit also has circuit blocks to measure feed condenser voltage, line current, alternative voltage with respect to grounding and the state of the battery.

Abstract: A remote controlled tone generator system is provided that permits a telephone technician to remotely control the operating mode of a test tone generator. This allows the technician to install the test generator at the telephone interface, climb the telephone pole and connect the line test monitor, and remotely control the test generator without having to leave his position on the pole. The test generator can operate in the following modes: direct current for polarity test, steady tone and dual tones for line transmission checks, and off for line noise checks. The remote control unit can be a separate module, or it can be built into a conventional technician handset. Alternatively, the tone generator may be controlled by a conventional telephone keypad.

Abstract: Maintenance terminal of a validation and identification unit defined as a tool designed to accomplish two functions allowing the local initialization of the validation and identification unit or of the adaptation unit of public modular telephones, so being not necessary for the operation system of modular telephones to call these, allowing extensive diagnosis and failure identification, also in a local mode, whenever the central processing unit be operative through the use of an interactive man-machine language.

Abstract: The equipment includes a front panel with LED indicators, key pad and a number of special function keys as well as an LCD message printout and volt/ohm meter. A hand set is readily available at the front panel as the line check unit functions with a commercially available craft terminal, a CMC Type 7910D terminal known as DATASTAR.TM., which includes the master central processing unit and random access memory for interactive function with the line check system. The DATASTAR.TM. unit communicates directly with a controller section that includes speaker power amp, LCD circuitry and 128K random access memory as well as a digital bus interface. The controller board is then connected through both a digital bus and an analog signal bus to an analog circuitry that includes relay control and various signal routing and test signal functions. The analog circuitry is then in communication with the volt/ohm meter and analyzer circuitry.

Abstract: A dual unit diagnostic system for testing the physical status of a multi-pair cable. Each unit comprises connectors which are connectable to the cable wire pairs, and switches that are connected to the connectors, and are also activatable to provide distinguishable conductive pathways between each wire pair. A signal transmission section is connected to the switches, and provides a signal to a selected wires. A signal reception section is also connected to the switches for receiving a signal from distinguishable wires. A microprocessor is connected to the transmission section and the detection section, and which controls the transmission and reception of signals. A display is connected to the microprocessor and switches, and provides information to distinguish various physical wire status conditions based on the reception of the signal at predetermined wires.

Abstract: Disclosed is a telephone line testing device comprising: clip leads for connecting the device to "ring," "tip" and external ground lines of the telephone line to be tested. Terminal pads make "ring" and "tip" connections to a craft telephone and a first testing circuit connectable to receive DC signals from the "ring" and the "tip" lines to provide electrical signals indicative of the magnitude of direct current available from the lines. Another testing circuit is connectable to receive AC signals from the "ring" and the "tip" lines to provide electrical signals indicative of the signal loss of the lines. A third testing circuit is connectable to receive AC signals selectably either from the "tip" and the "ring" connections or from the "tip" and the external ground connections comprising a filter and amplifier to receive and treat the AC signals and to apply the treated signals to the input of the second testing circuit.

Abstract: A telephone test set that performs dry loop testing of telephone lines has a passive speech network, a speakerphone circuit, and an amplifier and a speaker coupled to the speakerphone circuit. The passive speech network and the speakerphone circuit area isolated by the use of latching relays which are switched by a relay driver circuit that provides a short current burst. Line power can be used to power the speakerphone, so as to extend battery life of a battery which can augment the line power as needed.

Abstract: A handheld, battery-powered telecommunications test set which combines the function of tone generator and inductive input probe along with functions such as resistance measurement and continuity/discontinuity. The inductive input is coupled to one input of a differential amplifier, which is susceptible to oscillations caused by leakage currents in the circuits performing other functions. During operation of the inductive input monitor probe, some of these circuits are inactivated, but may still have some leakage current that could flow through them, causing oscillation. Additional circuit elements are added to provide a low resistance pathway to a second input of the differential amplifier to shunt leakage currents from the inactive circuit to the differential amplifier such that the leakage current are converted from a differential signal to a common mode signal and are not amplified.

Abstract: A portable self-contained T-carrier network simulating device including multiple modules which are removably mounted and connected and include a first customer premise simulation which includes an actual network smart jack and a repeater, a first T-carrier link simulation which provides conductive isolation between the ends thereof, bipolar violation removal and signal level change control to simulate a fiber link, a switching office simulation including an actual network digital signal cross-connect frame (DSX) and repeater, a second T-carrier link simulation which comprises wire T-carrier link simulation including an actual manhole repeater and line reversal device and also includes a simulation of bridge tap which is accessible from the front panel to simulate variation in the effect of positioning of the bridge tap, and a second customer premise simulation which includes an actual network smart jack and CPE jack.

Abstract: A handheld, battery-powered telecommunications test instrument with a talk battery circuit capable of supplying power for up to four telephone sets, which may be connected either in series or in parallel. The instrument determines the configuration of the telephone sets as having serial connections or parallel connections by sensing the amount of current flowing through the circuit of the invention. In response to the amount of current, a transistor automatically operates to supply power to the telephone sets as either a voltage source or a current source and maximizes power transfer between the telephone sets. The instrument has a low power mode to reduce current drain on the battery that is automatically engaged when the telephone sets are not in use.

Abstract: A portable instrument for locating and measuring harmonic distortion in a conductor. The instrument permits voltage and current harmonics to be easily read while the load is changing. Thus, the instrument may provide a great deal of insight as to the source of problem causing harmonics.

Abstract: A two-unit device for identifying individual conductors in a multi-conductor installation having two ends. Each unit includes a telephone handset interposed in a series communication and continuity circuit. One of the units is a master unit and includes a multi-position switch for selecting individual conductors. The other unit is a slave unit and includes a set of LEDs. During operation, a person with the master unit selects a particular conductor by means of the switch, and an LED at the slave unit identifies the other end of the selected conductor. The two persons then communicate over the circuit being identified, and establish a label designation for the ends of the particular selected and identified conductor.

Abstract: A handheld battery-powered telecommunications test instrument for monitoring the status of a pair of wires. A tone-generating circuit generates a tone signal in response to the user manually selecting operation in a tone-generating mode. The instrument monitors the pair of wires to determine whether an on-hook, off-hook or ringing signal is present on the wires, and if present, generates an interrupt control signal through a microprocessor. Logic circuitry connected to the microprocessor results in connecting and disconnecting the tone-generating circuit and the pair of wires to selectively apply the tone signal to the wires. In response to the control signal and the user selecting the tone-generating mode, the microprocessor connects the tone-generation circuit to the pair of wires if no control signal is generated, and disconnects the tone-generating circuit if the control signal is generated.

Abstract: A hand held telephone test set includes an internal strain relief interface configuration. The interface includes a well structure formed in a housing of the test set, with a plug receptacle disposed in the well structure. Additionally, a plug line channel is disposed in the housing and receives a plug line associated with a plug connected to the plug receptacle. The channel has a shape that provides strain relief for the plug/receptacle connection and the connecting line/plug connection.

Abstract: A novel method and improved system for the continuous detection monitoring of authorized/unauthorized connections/disconnections including loop bridging wiretapping equipment capable of monitoring recording voice and/or data communications on the subscriber's local telephone loop.In operation the detector monitor displays electrical changes in impedance condition and characteristics on the subscriber's local telephone loop to detect and monitor signaling, switching equipment and telephone lines connecting/disconnecting anywhere on the loop including the central exchange before, during and after the completion of a telephone call continuously.

Abstract: Versatile multiconductor cable test apparatus when connected to opposite ends of the cable indicates conductor defects (shorts and opens), reversal of conductors in sequentially connected cables, and identifies the location of a defective conductor or conductors. The apparatus can be readily operated by one person, is quickly connectable to the cable and is constructed with commercially available inexpensive parts.