Abstract: A telephone having a dialer for repetitively dialing a desired number at 40 second time intervals. The telephone is initially used in the normal manner, and when the number being called is busy, the user hangs up the telephone and depresses a button to place it in a reiterative dialing mode. Thereafter the telephone, at 40 second intervals, repetitively dials the desired number. Each time a busy signal is detected the telephone disconnects from the line, and dials again 40 seconds later. When a ring signal is detected, indicating the number called is no longer busy, an alarm alerts the user to pick up the receiver. All of the logic and control circuitry involved, except the power supply, is built into the telephone.

Abstract: A method and apparatus for testing the tip-ring polarity of telephone receptacles connected in parallel to a non-working pair includes a battery and an LED, the device being capable of being plugged into a subscriber's telephone receptacle. When a diode is properly placed across the non-working pair, the LED will light if the final terminals of the receptacle are wired with the correct tip-ring polarity. The disclosure teaches that the diode may be incorporated in various types of packages and may be connected across the non-working pair in several different ways.

Abstract: This invention relates to a coin surveillance apparatus that will monitor the amount of money deposited in a pay telephone, vending machine or the like. The apparatus is comprised of two basic units, the first being a monitoring unit positioned within the phone or machine for monitoring the amount of coins deposited therein; the second unit being a polling and display unit for receiving information from the first unit as to the number of nickels, dimes and quarters deposited in the machine. The second unit has means to initiate a command to the monitoring unit for a reading and/or for recording and displaying the information when received.

Abstract: An alarm and audit system for use with loop start telephones and with either semi-post-pay or pre-pay operations, and installed as office equipment for tabulating and storing information concerning collections from coin operated pay telephones, so as to ensure optimum collection and as a perceptive alarm against burglaries; utilizing counter means activated by coin tone bursts transmitted over a pair of normal telephone lines; in semi-post-pay phones the tone burst information being conducted directly to memory means; in pre-pay phones the tone burst information being held in abeyance to be released for tabulation in the memory means by a positive voltage applied when collecting coins, or dropped from said abeyance means by a negative voltage applied when returning coins. The tabulation is accumulative in one of two memory means selectively called upon by computer means to produce information for distribution to those concerned with servicing the said pay telephones.

Abstract: A first amplifier measures the instantaneous voltage across a resistor, connected in series with the electromagnet of a solenoid valve, as the current increases following energization of the electromagnet. A second amplifier measures the same voltage and stores the peak value in a capacitor. The two measured voltages are applied to a comparator which detects the difference, and generates an output, when operation of the electromagnet armature causes a transient reduction in the resistor voltage. Initial energization of the electromagnet sets a memory and starts a monostable timing period. The set output of the memory primes one input of an AND gate, the second input being inhibited by the monostable output during timing. If the electromagnet armature operates normally, the comparator output resets the memory and removes the AND gate priming signal prior to completion of the timing period.

Abstract: A main distributing frame for telecommunication lines adapted for single-sided administration and comprised of vertical supports adapted to extend between floor and ceiling approximately one inch in depth and spaced on seven inch centers. Intravertical jumpering is accomplished via three horizontal cable troughs, normal jumpering being routed through centrally disposed and lower troughs, with special service jumpering being run through an upper trough, thereby minimizing jumper congestion and build-up. Outside cable pairs may be cabled either through the top or the bottom of the frame, which may be aisle mounted, or may be mounted against a wall surface either parallel to or perpendicular to the equipment, thereby minimizing inter-aisle cabling.

Abstract: A key telephone set is disclosed having a programmed digital computer which signals a central switching and control unit of a key telephone system of the status of a plurality of function switches and receives signals from the central switching and control unit that certain electrical connections and visual indicators in the key telephone set are to be initiated or controlled. Two independent audio communication circuits are provided in the key telephone set for interconnection to either the hybrid network of the handset or the built in speakerphone unit. Central office lines are accessed via individual function switches. Intercom calls are initiated via one function switch, and are answered hands-free via the speakerphone or are answered via the hybrid network. A wide range of features are signalled via the function switches and are visually monitored by means of visual indicators. The key telephone set may be used interchangeably with either dial pulse signalling units or tone signalling units.

Abstract: The invention described herein is a traffic measurement device, particularly applicable to telecommunication networks. The device is of the digital type and relies on state transitions caused by the origination and termination of calls. This type of measurement is not vulnerable to inaccuracies of traditional measuring systems, particularly those using scanning methods.The device requires, theoretically, only three measuring leads common to all servers in the group under consideration, irrespective of the number of servers; one lead transmits a pulse at the time of seizure of a server, the other transmits a pulse at the time of release of a server, and the third transmits a pulse when all servers are busy. The last pulse is used for system initialization and for measurement of congestion.The basic device integrates the server occupancy states over time by adding the number of scored busy servers in each state a number of times proportional to the duration of the state.

Abstract: A straight line dialing mechanism for a telephone employs a movable plate having finger tip accommodating apertures. Initial movement of the plate to an index position causes a spline on the plate to close a switch that short circuits the telephone receiver and winds a spring that supplies the force for return of the plate. Return movement of the plate is controlled by a speed governor. The plate carries a series of nodes which actuate the leaf of a normlly closed switch to momentarily open the switch with the passage of each node in the return of the plate to its initial position. The leaf carries a ratchet head that enables the nodes to pass in the opposite direction without appreciable flexure of the leaf.

Abstract: An electronic prepay adapter circuit is provided for use in converting semi-postpay central office telephone equipment to operation in a full prepay mode. In one arrangement, a prepay adapter circuit is connected on a line by line basis between each pay station and the associated line relay of the central office telephone equipment. In another arrangement, the prepay adapter circuit is connected between the linefinder and the first selector of the central office telephone equipment and utilized on a common or shared basis for a plurality of pay station telephone lines. The prepay adapter circuit is easily connected as a self-contained unit or module into the central office telephone equipment by the connection of the central office battery supply, ringing generator, collect and return voltage supplies, sleeve control lead, and the tip and ring line connections.

Abstract: Improved control apparatus for a pay station is provided that automatically determines the applicable tariff rate and the purchased call time as coins are deposited in accordance with the pay station identification and the phone number of the called party. Selective programming is provided by the control apparatus to select a basic time rate period for each of a predetermined number of tariff rates corresponding to calls to various telephone tariff zones. The control apparatus automatically operates the pay station in either a postpay or prepay mode and credits the calling party with a number of basic time rate periods corresponding to the total value of deposited coins and as coins are deposited. The basic time rate period corresponds to a predetermined number of seconds for a specified basic coin value or denomination. Thus, the calling party establishes a purchased time credit equal to the basic time rate period multiplied by the total number of basic coin denominations deposited.

Abstract: A power control circuit which supplies all of the power requirements of a telephone subscriber's loop circuit in a digital telephone switching system. A central processing unit generates digital power supply selection and control signals which are decoded and stored by the power control circuit. These signals are then supplied to a selected programmable power supply for selected time durations.

Abstract: Standard four prong, plug-in telephone sets are modified to enable intercommunication among the sets on the subscriber's premises. In a subscriber telephone system including a single central office circuit, only two of the standard four prongs and associated receptacle sockets are used for establishing connection to the central office circuit. In the disclosed system, a local intercom circuit is added to the premises and connects to the remaining two sockets in each receptacle so that each set that is plugged in is also connected to the intercom circuit. The sets are modified to include a line selector switch which enables the talk circuits therein to be switched back and forth between the central office circuit and the intercom circuit. An intercom call signal generator and detector is also added to each set for intercom call signalling over the intercom circuit.

Abstract: A circuit for apparatus to be used with a key system line card for providing electrical isolation between the line circuit and the central office. The adapter responds to ring current from the central office to close a path to the line circuit to cause the line circuit to respond. The circuit provides two-way supervision responding to change of conditions either at the station or at the central office, and also provides a time delay to prevent the circuit from entering the hold condition improperly.

Abstract: A calling device usable in telephone subscribers' instruments to selectively close a set of contacts upon the depression of one of a plurality of upwardly biased pushbuttons. The device is adapted to be assembled modularly and includes an integrated switching module arranged as an unitary assembly. A plurality of one piece spring and contact members within the switching module serve to restore each pushbutton and provide a single "make" contact with an included contact strip whenever an individual pushbutton is depressed. Formed wiper contact ends of each spring and contact member and contact strip, electrically connect to a circuit board which is disposed to engage a rear face of the switching module. The front face accepts a faceplate and pushbutton assembly which is keyed to the switching module and is easily removed and replaced without disassembling the entire calling device.

Abstract: A current/flow comparator for generating an alarm signal whenever the instantaneous flow rate of a coolant fluid cooling the armature of a dynamoelectric machine falls below a predetermined percentage of a desired instantaneous flow rate, which desired flow rate varies as a function of the square of the instantaneous current flowing through the armature, is disclosed.

Abstract: An improved electrical jack assembly (20) for converting to modular use a telephone terminal block (10) with screw terminals (11) is disclosed. Leads (32) in the jack assembly connect at one end (31) to contact elements (27) in a modular jack (22) affixed to an assembly housing (21) and at the other end (33) to screw-engaging connectors (34), each of which comprises a body (37) of conductive material with a base (40) and a plurality of resilient elongate members (42) extended therefrom. The free end portions (45) of the members (42) include sharp-pointed contact tips (47). The free end portions (45) also tend toward one another to define with their tips (47) an opening (48) for snugly receiving a head (12) of an assigned screw terminal (11), where the tips (47) can bear against the screw head (12) to effect reliable electrical and mechanical connection.

Abstract: The system includes up to four communication links, a separate link selector for each link, and a separate link scanner for each telephone station. The system is suitable for usage with conventional dial pulse or tone selective key telephone sets.

Abstract: A device for use with a telephone transceiver to automatically generate any one of N stored dialing codes employs N digital phone number storage registers, and a set of N/2 pushbuttons. A display panel having N display areas on which the stored numbers may be written is supported in sliding relationship with the pushbuttons so that either of two display areas may be moved into operating relationship with each button. Switches controlled by the position of the panel and by the command buttons connect one of the phone number storage registers to a dial signal generator.

Abstract: A circuit which overrides the initial rate circuit included in a coin telephone, to allow the central office to perform coin collect and refund operations independent of whether or not the initial rate has been deposited. This circuit operates in response to coin battery applied by the central office to operate a rate relay which connects the included coin relay to the central office.