Abstract: This disclosure depicts a multi-function bus for use with a central processor system, user devices having user interfaces and a host switching interface unit. The multi-function bus has a first pre-determined number of transmit and receive lines connecting the central processing system, the user interfaces and the host interfacing unit. A second pre-determined number of channels on each of the transmit and receive lines is provided for on the multi-function bus. A multi-function bus includes the transfer of information to and from the host switching system both in a serial mode and in a parallel mode on the multi-function bus.

Abstract: Automated telephones with electronic circuits for outputting dial digit sequences respectively corresponding to different ones of a plurality of user's switches when each switch is momentarily actuated. The circuits permit speed dialing of (i) directory numbers, (ii) tandem sequences for accessing outside centers and specific line numbers, and (iii) access or feature codes. The apparatus is characterized especially by devices to create automatically loop breaks to simulate either a hook flash or a re-seize on-hook condition in certain circumstances and despite the fact that the telephone remains off-hook. By simple wire connections between a master or "secretary's" telephone and each of the member's phone sets within a limited group, intelligence signals are interchanged to provide "key line group" action without an elaborate, separate "control box" and even though each telephone of the group is served by the central system only via its own two-wire line.

Abstract: This invention depicts a novel sine wave ring generator for use with a telephone circuit and an input voltage having a predetermined range, the generator comprising a switching power supply for providing a pre-determined DC output voltage from the input voltage range, an oscillator for providing a pseudo-sine wave output with a predetermined frequency, and an amplifier for amplifying the pseudo-sine wave and for receiving the predetermined DC voltage having a low output impedance thereby maintaining regulation of a circuit output voltage in a predetermined range and supplying a circuit output current.

Abstract: This disclosure depicts a build out capacitor for use with a voice frequency loaded pair having tip and ring terminals. The circuit comprises means for providing a virtual impedance between the tip terminal and ground and between the ring terminal and ground. The means has a first input connected to the tip terminal and a second input connected to the ring terminal. The means for providing also has first and second outputs. A first fixed capacitor is connected between the first output and the tip terminal and a second fixed capacitor connected between the second output and the ring terminal. The first capacitor is equal in value to the second capacitor.

Abstract: This disclosure depicts an active network for providing a virtual impedance to a voice frequency loaded pair having tip and ring terminals. The network comprises means for providing a predetermined capacitance between the tip terminal and ground and between the ring terminal and ground and has a variable resistive means. The means has a first input operatively connected to the tip terminal and a second input operatively connected to the ring terminal and also has first and second outputs. First and second fixed resistive means are operatively connected between the first output and the tip terminal and the second output and the ring terminal, respectively. The value of the predetermined capacitance is determined by the first and second fixed resistive means and the variable resistive means in the means for providing a predetermined capacitance.

Abstract: To produce bundles from strip, the strip is withdrawn from an uncoiler or coil and slit into a number of narrow strips that are supplied parallel and separated by about 2 mm to a winding point. The strip is wound at the winding point into bundles with a sheet-like or film-like insert that extends over the total width of the strips being supplied adjacent to each other also being wound in between the individual layers of the bundles. When the resultingly wound strip are unwound, the insert between the bundle at one end of the composite coil and the rest of the composite coil is separated in such a way that a strip of insert is removed along with a strip of metal from the composite coil and wound or coiled separately from the metal strip. The composite coil made up of individual parallel metal strips with the insert wound between them can be conveniently handled for conveying and storage at both its surface and side edges.

Abstract: An adjustable slope equalizer is disclosed for maintaining a predetermined output level at a predetermined frequency. An equalizer comprises: an adjustable input means; a first voltage divider means having an output and having an input operatively connected to the low impedance input means; a second voltage divider means having an output and having an input operatively connected to the low impedance input means; an adjustable high impedance means having an output and having at least two inputs operatively connected to the outputs of the first and second voltage divider means; and a SAG correction means operatively connected to the output of the adjustable high impedance means. The output of the SAG correction means has the predetermined output level at the predetermined frequency for any setting of the adjustable high impedance means.

Abstract: An equalization network is disclosed combining negative slope equalization with low pass filtering and low frequency compensation. The network is for use on electrical lines transmitting electrical signals in the voice frequency range and includes circuitry for inputting and equalizing the electrical signal on an incoming line. A circuit for reverse equalizing the electrical signal, first and second circuits for equalizing the signal, circuits for low pass filtering the signal followed by a supplemental equalization circuit and then a circuit for outputting the signal to the outgoing electrical line are provided.

Abstract: A multilevel data base memory structure for use by the processor control of each of a plurality of interconnected telecommunication switching systems so that communications between any two of the systems can be established with minimal interaction by the users. A comprehensive directory number plan provides for the allocation of blocks of at least one hundred directory numbers (i.e. 2400-2499) to the stations or features of each switching system. For those directory numbers serviced by a switching system the thousands/hundreds digits are utilized as addresses of locations of the memory structure first table level, the contents of which are pointers to various sections of a second table level. Within each such section the tens/units digits are used as addresses to define a location having stored therein an ultimate system function representative of, for instance; a standard call, conference call, speed dial . . . etc.

Abstract: An improved electronic hybrid for coupling signals between two wire and four wire transmission circuits. The hybrid includes a pair of amplifiers associated with a pair of terminating impedances which are serially connected between the amplifier outputs and the two wire port. The amplifiers driving the two wire port through the terminating impedances are biased to couple a dc potential to the two wire line whereby the terminating impedances serve as battery feed resistors. Each amplifier-impedance arrangement includes a feedback circuit connected from the junction between the impedance and the two wire port and an input of the amplifier for providing positive feedback for the amplifier so that the output impedance of the hybrid is maintained at a desired level using battery feed resistors of smaller value than heretofore required. The result is the ability to drive longer loops through the smaller series impedances while at the same time exhibiting the desired terminating impedance.