Abstract: A local transfer arrangement for an electronic private automatic branch exchange having a space divided rectangular solidstate switching matrix is disclosed. The local transfer arrangement is provided with means for sensing a local transfer indication from either a calling station or a called station connected by a local junctor. The transfer indication causes the system to forward the transferring station to a second local junctor and hold the first local junctor. A transferee station is then signaled via the second local junctor of the impending local transfer by the transferring station. Thereafter, an automatic forwarding of the transferee station to the first local junctor is initiated by an on-hook condition of the transferring station to complete the operation. Additional features of the arrangement provide for a return to the original call and release of the connected junctors responsive to an on-hook or hookflash condition of the transferring station.

Abstract: A loudspeaking telephone system including voice switching is disclosed. The system is bistably voice controlled by inversely regulating the impedances of variolossers in the transmit and receive channels respectively. Further provision is made for switching additional impedance in parallel with each variolosser control to provide for a loud and a soft receiving mode. Hysteresis is added to the bistable control by the summation of receive and transmit signals across a plurality of unequal impedances that form part of a novel input control means. Circuitry forming the input control means also includes noise guard means useful in discriminating between ambient noise signals and syllabic speech signals. The noise guard circuit discriminates between noise signals and speech signals by producing an output whose amplitude is substantially related to ambient noise conditions while the noise guard circuit generally is not responsive to rapidly fluctuating voice signals.

Abstract: A method and apparatus are disclosed for providing automatic toll ticketing in a common control telephone system. The method includes sequences which provide automatic ticketing for station-to-station sent paid local or tributary terminations with automatic or operator number identification. The apparatus includes an adapter circuit connected to the common control for directing the transfer of toll information from common registers to a toll buffer. An automatic recorder is controlled by the toll buffer and a plurality of recording trunks to receive charge information and provide a permanent record of the toll charges for the common control system.

Abstract: A tie trunk control arrangement is disclosed for providing tie trunk connections in an electronic private automatic branch exchange which is built around a space divided solid state matrix. Each tie trunk has an associated tie trunk junctor dedicated thereto which may be connected to local stations by the PABX system in a manner similar to other trunk junctors. For incoming tie trunk connections an attendant extension or station attendant extension is used for providing connections to other PABX stations and trunk circuits. Common circuitry used for trunk transfer and trunk consultation may be used by the station attendant to extend the tie trunks to the PABX stations and the outgoing trunk junctors. Further circuitry is provided by the tie trunk control arrangement to allow a tie trunk and a central office trunk to be tandemed in the system or to allow two tie trunks to remain tandemed in the system without attendant supervision.

Abstract: An automatic number identification system in a tributary office having simultaneous dual operation for high traffic capacity. A pair of identifier units applying identification signals via the sleeve wire associated with the calling stations to a common matrix or directory number network.

Abstract: An electronic private automatic branch exchange is built around a space divided solid state matrix. One side of the solid matrix provides line appearances which are connected to line circuits, tone receivers, senders and operator loops. The other coordinate side of the matrix provides junctor appearances for connection to an attendant junctor, local junctors and trunk junctors. The solid state switching matrix is a single stage matrix providing direct connection between line appearances and junctor appearances by the closing of a single crosspoint, and connection between lines within the system is effected simply by the interconnection of a pair of crosspoints associated with the respective lines and a selected junctor, thereby providing a greatly decreased switching for establishing a connection through the matrix. The control necessary for effecting such connections is provided with much simpler common control equipment than is utilized in a conventional multistage switching network.

Abstract: In a digital signalling network of the kind in which only data pulses are transmitted among the different stations, and more than one of the stations includes means for producing clock signals, synchronization of the network is achieved by producing at each station, in response to received data pulses, derived clock signals at the same rates as the clock signals produced at each of the other stations. Each station scans all available clock signals, its own and all those derived from the incoming data signals, compares the scanned signals one by one with its own operating rate, and adjusts the rate to conform to the slowest signal. The signals of concern are time-spaced electrical pulses, and rate comparison is accomplished by counting.

Abstract: An interface circuit is disclosed for ground starting central office trunks connected via a station carrier system to a plurality of PBX subscriber terminals. The interface circuit extends ground start signals between central office sensing means and subscriber terminal control means over the high frequency transmission cable of a multiple-channel station carrier system. Associated with each of the plurality of multiple-channel units that interface central office terminal trunks to the carrier system are ground start sensing means multiply connected to ground start common circuitry. The ground start common circuit interprets signals from the ground start sensing means as to which of the voice frequency connecting pairs indicates a signal ground and subsequently forwards this information in the form of modulated intelligence on a discrete carrier over the high frequency transmission highway.

Abstract: A circuit is disclosed for providing trunk transfer in an electronic private automatic branch exchange which is built around a space divided solid state matrix. The trunk transfer circuit is enabled by a hookswitch flash from a transferring PABX station connected to an established incoming or outgoing trunk call and directs the trunk junctor associated with that call to place the connected trunk on hold. While the connected trunk junctor is in a held status, the transferring PABX station is forwarded to a local junctor by the trunk transfer circuit and a connection is established from the local junctor to a transferee PABX station. The trunk transfer circuit then completes the transfer by establishing a connection between the held trunk and the transferee PABX station via the held trunk junctor.

Abstract: Apparatus and method for the uniform dispensing of a conductive epoxy binder in hybrid microcircuit applications. A method is disclosed of uniformly pressurizing a conductive epoxy binder through a small orifice until a droplet of fixed volume forms, setting a predetermined gap size between a contact pad and the droplet in order to control the shape and size of the epoxy droplet left on the pad as the droplet touches it, and then releasing the pressure while reciprocating the dispenser from the pad. Also, apparatus, including a cylindrical limiting means attached to the dispenser tip, is disclosed for ensuring the gap size is constant. Other embodiments of the limiting means provide for the use of a relieved section which assists in preventing contamination and for adjusting means operable to vary the gap size.

Abstract: A control circuit for a subscriber station in a video telephone system includes detectors, gates, and toggles responsive to the various local and incoming supervisory signals to control operation of the local audio and video receivers and transmitters, and the ringers for selectively announcing incoming ordinary and video calls.

Abstract: A telephone system comprises a non-loaded, non-equalized cable interconnecting a pair of communication terminals so that audio signals are translated in one direction and modulated carrier signals are translated in the other direction. A direct current bypass circuit is provided at each terminal to allow the transmission of direct current supervisory signals and battery potential over the non-loaded, non-equalized cable.

Abstract: A printed circuit card receptacle formed of one or more edge connectors having a pair of opposed, slotted card guides affixed thereto. The receptacle includes a mountable connector having a channel member at either end thereof for receiving the guide. Each card guide has a sleeve portion for slideably engaging the channel member and a releaseable locking means for holding the card guide affixed in place after full engagement of the sleeve with the channel member. The receptacle includes means for holding the printed circuit card in the connector.