Abstract: An offset adapter connector for use with a plug-in device, such as the line (L) relay of an originating register, that allows connections to be made to the terminals of the device and to the terminals of the socket into which the device is normally plugged is disclosed. The offset adapter connector includes an elongate housing having mounted therein, in axially offset positions, a plug and a socket. The connector plug fits into the socket into which the plug-in device is normally plugged and the plug-in device fits into the connector socket. Due to the side-by-side position of the connector plug andsocket, the plug-in device is offset from its normal position. While offset, the plug-in device retains its normal orientation, (e.g., vertical). As necessary, the connector plug and socket are wired together and to a cable suitable for making connections to related electronic circuitry.
Abstract: A solid state pulsing circuit and an adapter connector for pulsing the counting and register advance terminals of the L-(line) relay of an originating register in accordance with the digit nature of received DTMF signals is disclosed. The pulsing circuit includes a pair of solid state switches adapted to be alternatively actuated and the adapter connector connects the pulsing circuit to the counting and register advance terminals of the line relay without affecting the normal operation of the relay. Complementary MAKE and BREAK signals derived from the serial pulse output of a DTMF receiver operate the solid state pulsing circuit such that the pulsing circuit alternately pulses (opens and grounds) the counting and register advance terminals of the line relay in accordance with the production of pulses by the DTMF receiver. Other relay terminals (i.e.
Abstract: A dial signal receiver for receiving and decoding telephone digit signals in either dual-tone multifrequency (DTMF) or rotary dial pulse form is disclosed. DTMF digits are accepted, if, simultaneously, both the high and low frequency components, derived from a band-split filter, repetitively pass a short term check; and each component passes a long term check once. The short term checks comprise repetitively measuring the period of two consecutive cycles of each component of the input signal. The long term check comprises measuring the period of a number of cycles of each component of the input signal. The number of cycles for each component is dependent on the nominal frequency determined by the short term check of that component. At the end of a cycle related period, a "window" is opened for a time interval related to the expected frequency, as determined by the short term check. If a short term check pulse occurs during the open window period, the related component is accpeted as valid.
Abstract: An electrical connector retaining device for retaining the male and female members of an elongate electrical cable connector in their mated positions is disclosed. The retaining device includes a semi-resilient strap and a rigid frame. The strap includes a planar region and one or more anchoring prongs having bullet shaped ends integrally formed with the planar region and projcting outwardly from on edge thereof. Extending obliquely outwardly from the edge of the planar region opposed to the prong edge is a flange. The flange is integrally formed with the planar region and includes a plurality of ridges that lie parallel to the edge from which the flange extends. The rigid frame may be integrally formed in the housing or chassis of an electrical subsystem, or as a separate item. The rigid frame includes an aperture in which one element (e.g., male or female) of the connector is mounted. That element is attached to the rigid frame.
Abstract: A multiple link circuit for coupling a plurality of telephone lines to the ports of a port multiplexer without requiring the splitting of C-leads is disclosed. The multiple link circuit includes an internal priority determining arrangement that eliminates the need for individual links to be scanned by an address scanner. Each link of the multiple link circuit is bridge connected to a C-lead and includes: a busy detector for detecting the busy status of the C-lead; and, a control circuit for controlling the coupling of a subscriber seized telephone line to the associated port. The priority determining arrangement prevents any lower priority control circuit from coupling a seized telephone line to the associated port if any higher priority line is simultaneously attempting to be so coupled. After signal processing (performed by a signal processor connected to the port) has ended, or some other release action occurs, a port generated release signal disconnects the seizing link from the port.
Abstract: An incoming signal (tone) and the feedback signal of a biquadratic filter are converted into square waves by zero crossing comparators. The phase state of the square waves is decoded and the decoded result is phase compared to determine if a 90.degree. phase shift exists between the incoming and feedback signals. If a 90.degree. phase shift does not exist, a counter is incremented or decremented, depending upon whether the phase comparison indicates that frequency of the incoming signal is greater, or less than the feedback signal. The output of the counter is decoded and utilized through a switching circuit to control the center frequency of the biquadratic filter (determined by the impedance of its feedback path). The switching circuit changes the impedance of the feedback path so that the center frequency is moved toward the frequency of the incoming signal.
Abstract: A circuit for preventing the automatic operation of the time-out portion of a tone-to-pulse converter until after the first DTMF digit is dialed is disclosed. When a calling party goes OFF HOOK, the forward loop current flowing in the tip and ring in leads is sensed. The sensed current creates a binary zero signal that sets a latch circuit. The latch circuit inhibits the automatic operation of the time-out portion of the tone-to-pulse converter until the latch circuit is reset. The latch circuit is normally reset by the first output of the tone-to-pulse converter adapted to create a rotary dial-type pulse. Alternatively, going ON HOOK without creating a DTMF digit resets the latch circuit, as does the occurrence of a rotary dial pulse on the tip and ring in leads.
Abstract: A circuit for making existing automatic number identification (ANI) equipment in a telephone central office compatible with multifrequency tone telephone using tone-to-pulse converters. In a typical ANI system, the telephone of one party on a two-party line includes an identification circuit, such as a connection to ground, while the other telephone does not include such a connection. When one party initiates a call, the tone-to-pulse converter interrupts the direct line pair connection between the telephone and the central office, in order to convert the multifrequency tones generated by the telephone into corresponding pulses recognizable by the central office. During this period, a voltage comparator in the preferred embodiment of the identification forwarding circuit serves to detect the voltage condition of the line pair portion connected to the one telephone, which condition varies depending on the presence or absence of the connection to ground in the telephone.
Abstract: A link is connected between each linefinder/first selector combination of a telephone system. The links, in turn, are selectively connected to a group of ports, several links to one port, and the ports are connected to one or more telephone signal processors. When a telephone goes OFF HOOK, the sleeve or C lead of the linefinder at which that telephone's scanning switch is then pointing (determined by the associated link being connected to an available port) is grounded. When the address of this link next occurs in a time multiplex cycle, the link is latched, and the telephone's tip and ring leads are connected to the link's port. After signal processing has ended, or some other release action occurs, the port generates a release signal that disconnects the link from the port. While any link is connected to its associated port, a make-busy ground circuit forming part of eack link applies a false busy signal to the linefinders associated with the other links common to the same port.
March 17, 1975
Date of Patent:
March 23, 1976
Daniel Richard Asmussen, Barry Cameron Breen