Abstract: A means is provided within an interface to data terminal equipment for obtaining call progress information. The call progress information provides relevant data as to the progress of a call initiated by the data terminal equipment. The interface is designed to be used in a portion of the telephone network that lacks byte alignment. Such portions of the telephone network do not currently receive call progress tones. The interface is preferably a data service unit that includes a receiving means processor and a display means. The data service unit interprets signals sent from the DDA/OCU that encode the progress or absence of call progress tones sent from the destination node of an initiated call.

Abstract: This invention is an electronic key telephone set including light-emitting elements for state indication, an acoustic converting element for converting a voice signal into an acoustic wave, a display unit for displaying characters and the like, operations keys, including pushbuttons, for performing an input operation, and a control unit having an operation check test function for checking functions of the telephone set including telephone set components such as the light-emitting elements, the display unit, and the acoustic converting element, for waiting for a key input after initialization is executed, if predetermined specific keys of the operation keys are operated within a predetermined time, executing the operation check test function, and if the specific keys are not operated within the predetermined time, activating a function as a normal telephone set.

Abstract: A digitizer tablet provided with menus over the marginal areas in the non-linear boundaries of the regular electrode array. Coordinate signals from the menu areas are processed to vary a parameter of the processing circuitry for the coordinate value outputs.

Abstract: A coin call telephone apparatus includes a control device comprised of a housing having set therein a coin track for continuous insertion therethrough of a coins of different value without interrupting the line so as to let the line be continuously keeping on for conversation. When a call is terminated or if the line is engaged, coins drop into refund slot immediately after hand set is hung on the cradle of the housing, and the pressure force from the cradle immediately forces a link rod to move downward to further drive a curved retainer frame to turn back so as to turn off the telephone apparatus.

Abstract: Test apparatus for signalling systems having plural terminal units (26X) and line-pair connections (24X) therefor, comprises off-line test equipment (10) for parameters or conditions of said connections (24X), and connection means (30) of or for the test equipment (10) relative to said system. The connection means (30) comprising plural connectors (32X, 34X) as inputs for a number of said connections (24X) to said terminal units and multi-way switch means (40X) affording selection of said inputs (32X) one at a time for communication with other facilities of said off-line test equipment (10).

Abstract: A digitizer tablet uses sequenced wire addressing to derive time-related voltages correlated to the location of the addressed wires. The voltages are digitized, and an algorithm followed to determine by interpolation the exact position of a pointing device over the addressed wires. The algorithm employs a calculation based on determining the X-intercept of a straight line.

Abstract: An apparatus and method for testing voltage arresters and current shunting circuits within a telephone circuit protector are described. A typical protector tested by the apparatus and method includes two voltage arresters and two current limiting circuits. One set of a voltage arrester and a current limiting circuit are tested for voltage breakdown, continuity and ground faults by actuation of a single test operating switch. The other voltage arrester and current limiting circuit are then selected and tested by a single actuation of the test operating switch. Breakdown voltage, continuity, ground fault and low battery visual indicators are provided.

Abstract: The device locates the position x of the point of connection of one of the electric conductors (2) of unknown ohmic values, connected to unknown separate points of a collecting resistor (R.sub.1) of unknown but constant ohmic value per unit length, to which a standard resistor (R.sub.e) is also connected whose ohmic value is a known optimal multiple (k) of that of R.sub.1. The superposition of two such devices, separated by small rods of elongated form, may serve to create a dependable and inexpensive opaque or transparent panel allowing the locating of the position (x, y) of the one of its points as soon as a slight pressure is exerted on this point.

Abstract: In a telecommunications network in which a plurality of switching nodes are interconnected via links each composed of a plurality of trunks and are each connected to a network control center via a control signal link, the network control center determines for each switching node a predetermined number of alternate routes for each first route on the basis of traffic data in the telecommunications network and supplies them as a set of available alternate routes to the switching node. The switching node assigns one or more of the available alternate routes in advance. The switching node responds to a call-connection request to try to connect the call to the first route, and when having failed in the call connection, the switching node retries the call connection through one of the assigned routes.

Abstract: A method and apparatus for the detection and prevention of pin fraud in a coin operated telephone is disclosed. A circuit detects loss of loop current and triggers the opening of a pair of switches thereby disconnecting the microphone from the phone. The A-relay is also switched to its refund and collect position. As a result, the fraud path through the microphone is disconnected, and the central office can perform all its control functions unimpaired. Thus, the incentives for perpetrating the fraud are eliminated.

Abstract: A digitizer tablet providing secure storage therein for the cables, clips, stylus, and cursor is disclosed. A recess molded in the bottom surface of the tablet is partially covered by a plate so that a rectangular pocket is formed. Two channels are also molded in the bottom surface of the tablet so that the cables used to connect the tablet to a computer and to the stylus or cursor can be safely stored without disconnecting the cables from the tablet.

Abstract: The position on a surface of an implement including a tuned circuit with a predetermined resonant frequency is determined and displayed by an apparatus having a housing including the surface. A tablet in the housing includes coils arranged in two coordinate directions parallel to the surface. The coils are excited with AC energy having approximately the same frequency as the resonant frequency. The tuned circuit interacts with the AC energy to change the AC current flowing in the coils as a function of the implement on the tablet. An electronic two-coordinate direction display in the housing configured as a plate is superposed with and lies in a plane parallel to the tablet and the surface. The display responds to the change in AC current resulting from the interaction between the AC energy and the tuned circuit to indicate the position of the implement on the surface.

Abstract: To interface a primary telephone terminal with a vast number of remote terminals through a telephone network, parties at the remote terminals are individually screened to attain a select group. Bridged together, the select group is preliminarily informed of the status of the interface by a voice generator and, accordingly, the multitude of connections are synchronized for the interface. On cue, the select group is coupled to the primary telephone terminal for unilateral communications. Deviations from the unilateral communication include select bilateral communication for a few of the remote terminals and digital communication from the remote terminals by push button as for polling applications. Subjects for interfaces are programmed for selection from a memory.

Abstract: There is disclosed a data interfacing method in a key-phone system and a subset key-phone system capable of speedily processing an event generated from a key-phone system by use of two data interfacing sections between the key-phone system and subset key-phone. The invention to increase the data interfacing speed includes: a first step for reading a state data of data received from a data receiver 43 and checking whether said received data is effective; a second step for reading the data from said data receiver 43 when the received data in said first step is effective, thereafter checking whether it is null data.

Abstract: Apparatus used for local simulation of a metallic pair of 22 Gauge conductors, such as comprising a telephone line, 6.5 miles in length at 70 degrees Fahrenheit consisting of a resistance network. This apparatus is useful for fault identification of telephone line amplifiers, allowing for local activation when used in conjunction with milliampere test meters, in lieu of a technician's required travel to a minimum of 6 miles to perform the same task. This apparatus is useful in that it allows for function testing of typical line amplifiers at the source of the metallic pair.

Abstract: A digitizer tablet is disclosed having a movable cover and a support which automatically stably holds the cover open when the cover is opened. The digitizer tablet comprises a base structure, a cover pivotably connected thereto and a support coupled to the cover and to the base structure for automatically holding the cover open when it has been pivoted to its open position. The support is constructed to self engage in the open position such that the application of a substantial force to the support is required to unlock it from the open position. Preferably, the support includes a spring resiliently urging the support to self engage in the open position. The support comprises a first support arm pivotally connected at one end to the cover and a second support arm pivotally connected at one end to the base structure, the first and second support arms each including an opposite end which are pivoted together.

Abstract: A telephone subscriber interface device provides privacy on a party line. The device provides for revertive calling, break-in, automatic disconnect, selective ringing, automatic number identification, and operates on the central office power supply. The device provides the following features: A connect state for the PLC in which the PLC is connected to the telephone line but in which the PLC is not responsive to other inputs, a ring decoder which detects either divided coded ringing signals or divided ringing signals in a novel manner, means for testing whether a revertive call has been properly terminated, a low power switch so that the PLC can run on telephone line power only without battery backup, and means for resetting the PLC to a ready state in the absence of other inputs.

Abstract: A method and apparatus to enable a low power telephone controller to operate with either a carbon microphone or a dynamid microphone is described. A jumper in a preamplifier and filter circuit is preset to accommodate the audio transfer characteristics of one or the other type of microphones. For either microphone, a small DC current of less than 500 .mu.A is used to sense the presence of either type microphone and serves the dual role of biasing the carbon microphone to the appropriate level to be amplified so that the input to an audio circuit in the controller us very nearly the same for either microphone. The audio circuit then processes and dynamically balances the signal to the telephone line, where it is output.

Abstract: The coordinate input unit is provided with a coordinate input pad in which one or more pairs of sheet-like electrodes for a function switch held by a pressure-sensitive electroconductive sheet having weighed input sensitivity different from that of another pressure-sensitive, electroconductive sheet, is laminated on a pair of flexible, sheet-like electrode groups for coordinate input having a plural number of electrodes in accordance with the pressing position, and which is held by the latter pressure-sensitive, electroconductive sheets. The described coordinate input unit allows to perform several input operations of coordinate input and using several function switches using only one hand.

Abstract: Network termination equipment including structure for transmitting signals back for loopback test. This can test all the functions of the unit by executing the loopback test only after having verified the normal operation of the circuits related to a call origination.