Abstract: A connector assembly designed to be mounted on a telephone main distribution frame includes a connector base having a plurality of rows of channels formed on one face by ledges extending between elongated edges of the connector base, a ground plate having a conductive side and an insulating side and a plurality of pedestals. A first set of terminals extends through the pedestals, the ground plate and the connector base into the channels, and a second set of terminals extends through the pedestals, the ground plate and the connector base so as to project from the ledges such that the first and second sets of terminals maintain the connector base, ground plate and pedestals together.

Abstract: A boiling water evaporator having a horizontally disposed shrouded heating tube bundle partially immersed in a liquid container. Improved heat transfer rate and high vapor release rate are obtained.

Abstract: A gas tube arrester protector used in protecting a pair of telephone lines from high voltages or surge currents includes a three electrode gas tube overvoltage arrester having a ground electrode adapted to be coupled to ground potential through a ground lead, a pair of line electrodes, each of which is adapted to be coupled to one of the pair of telephone lines through a terminal line or lead, a flat, generally U-shaped line contact and a fusible link coupled between the line contact and the line electrode. The gas tube arrester is positioned in an insulating housing or shell by disposing the line contact in slots formed by ribs on opposed walls of the housing and by positioning in grooves formed peripherally about an open end of the housing overlapped spacers having overlapping slots to receive the ground and terminal leads. The open end of the housing can be further sealed with an insulating material.

Abstract: A loop extender is used in conjunction with a pair of telephone lines extending from a telephone central office to a subscriber location in order to insert a booster DC potential on the telephone lines in such a manner as to aid the flow of DC current produced on the telephone lines by a telephone central office battery. A control circuit has one input terminal coupled to one of the telephone lines and a reference terminal, another input terminal coupled to the other telephone line and the reference terminal, and an output terminal coupled to a relay. Whenever the input terminals are supplied with a specified potential from the telephone lines, an output from the output terminal maintains the relay in a nonenergized condition so that contacts controlled by the relay couple a DC booster power supply in series relationship with one of the telephone lines.

Abstract: A protector module for use in protecting telephone lines includes an insulating base with two sets of line pins and a ground pin extending from one side of the base. Disposed on the other side of the base is a pair of spaced apart line contacts with one of the line contacts being coupled to one set of line pins and the other line contact being coupled to the other set of line pins and a ground clip assembly coupled to the ground pin and disposed between the line contacts. The ground clip assembly mounts a three electrode gas tube arrester having a pair of line electrodes and a ground electrode such that one of the line contacts is coupled to one of the line electrodes by a fusible element and the other line contact is coupled to the other line electrode by another fusible element.

Abstract: An automatic number identification device is used in a telephone system to enable a telephone central office to identify from which of two parties on a two party telephone service a call is originating and is coupled to a pair of telephone lines extended from the telephone central office to one of the parties being served by the two party telephone service. A loop current sensor is connected in series relation with one line of the pair of the telephone lines forming a subscriber loop and detects when a specified loop current is present on the one line. When the loop current sensor detects such a loop current, a control circuit, energized by power derived from the telephone lines and coupled to the loop current sensor by a photo coupler, couples a resistive ground to both of the lines in the given subscriber's loop.

Abstract: A station protector is used in protecting pairs of telephone lines at a station from high voltages or surge currents occurring on the telephone lines and includes a base assembly having an upstanding wall at one end, an arrester mounting section adjacent the opposite end, and a pair of line terminals and a ground terminal disposed between the wall and the arrester mounting section. A removable ground clip assembly is disposed in the arrester mounting section so that a three-electrode gas tube arrester having a line electrode at each end of the tube and a ground electrode therebetween can be mounted on the base assembly to provide protection for the telephone lines. The ground clip assembly contains movable contact assemblies insertable into each of a pair of cavities located in the arrester mounting section and resiliently biased so that a contact rod portion in the contact assembly is normally coupled to the ground terminal.

Abstract: A protector module for use in mounting a gas tube arrester or carbon arrester assembly in a telephone central office protection system has an insulating base and a conductive case or cover. The base has a channel with a projecting stop on one side, in which channel is disposed a portion of a line contact. Another portion of the line contact extends through the base and is positioned against an upstanding wall located at one end on the other side of the base, in which side the gas tube arrester or carbon arrester assembly is disposed. The case is secured about the other side and the upstanding wall by a plurality of spherical projections on the base which lodge in holes in the case. When the case is so positioned on the base, a line electrode of the gas tube arrester or carbon arrester assembly makes electrical contact with the line contact and a ground electrode of the gas tube arrester or carbon arrester assembly is coupled to the case.

Abstract: A gas tube arrester protector for protecting a pair of telephone lines from high voltage or surge current includes an insulating housing in which is disposed a three electrode gas tube overvoltage arrester having a pair of line electrodes and a ground electrode. The ground electrode is coupled to ground potential and each of the line electrodes is coupled to one of the telephone lines through a terminal line, a supporting terminal and a fusible link. The fusible links are in thermal relationship with the line electrodes and extend through cavities formed by spacers disposed adjacent each of the line electrodes. Whenever the line electrodes are heated sufficiently during an extended fault condition, the fusible links melt within the spacer cavities such that the line electrodes are disconnected from the terminal lines and thereby from the fault occurring on the telephone lines.

Abstract: A ringer isolator is used in conjunction with a pair of telephone lines to isolate ringer coils coupled to one of the telephone lines from a reference terminal except when a ringer signal is applied to the telephone lines. The ringer isolator includes an isolator such as a neon lamp/photo resistor coupler or a transformer partly coupled between the telephone lines and partly coupled to a thyristor such as a silicon controlled rectifier or a triac. The thyristor is coupled in series relationship between the ringer coils and the reference terminal. Normally, the thyristor is maintained nonconductive so that the ringer coils cannot be energized by potentials on the telephone lines. In response to the ringer signal being applied to the telephone lines, the isolator enables the thyristor to be rendered conductive so that the ringer coils are energized by the ringer signal.

Abstract: A station protector is used in protecting pairs of telephone lines at a station from high voltages or surge currents occurring on the telephone lines and includes a base assembly having an upstanding wall at one end, an arrester mounting section adjacent the opposite end, and a pair of line terminals and a ground terminal disposed between the wall and the arrester mounting section. A removable ground clip assembly is disposed in the arrester mounting section so that a three-electrode gas tube arrester having a line electrode at each end of the tube and a ground electrode therebetween can be mounted on the base assembly to provide protection for the telephone lines. The ground clip assembly contains movable contact assemblies insertable into each of a pair of cavities located in the arrester mounting section and resiliently biased so that a contact rod portion in the contact assembly is normally coupled to the ground terminal.

Abstract: A two pair station protector is used at a station to protect pairs of telephone circuit lines from high voltage or surge currents and includes a base assembly having an upstanding wall with a pair of notches, in each of which is insertable an insulating grommet and through each of which is extendable said lines. The base assembly also includes an overvoltage arrester mounting section for overvoltage arresters, a line terminal section containing four line terminals and a ground terminal coupled to the arresters and a storage space between the upstanding wall and line terminal section. In order to facilitate the wiring of the telephone lines extending through the grommets to the line terminals and to associate the line terminals with the arresters to which it is coupled, the line terminals are disposed between the upstanding wall and the arrester mounting section such that two of the line terminals are in alignment with one of the notches and the other two of the line terminals are aligned with the other notch.

Abstract: A connector block for interfacing incoming telephone lines to telephone central office switching equipment includes a generally rectangular elongated mounting panel having a plurality of sockets arranged in groups in horizontal rows and vertical columns across a major portion of the width of the panel. Each of the socket groups mounts a generally rectangular plug-in protector assembly in such a manner that the long side of the protector assembly is generally parallel to the horizontal rows of socket groups. Adjacent to and associated with each two rows of the socket groups is a group of cross-connect pin terminal holes. Integrally formed with the edge of the mounting panel adjacent the groups of cross-connect pin terminal holes is a fanning strip having a flange portion transversely extending from the panel through which flange portion extends a plurality of openings to permit access between the front and back of the panel.

Abstract: An electrical component container assembly includes at least one receptacle or case having a generally cylindrical body portion to contain at least one electrical component, a mounting track or guide with first and second channels, and a wire guard or cover to protect or cover electrical component leads projecting from the body portion. The case has a pair of legs which extend radially from the outer periphery of the body portion and which snap or slide into the first channel of the mounting track to mount the case on the track. The body portion also has a pair of spaced and rounded projections extending longitudinally along a part of the outer periphery of the body portion. These projections are received within mounting recesses on the wire guard to detachably mount the cover or guard on the body portion. Slidably insertable into the second channel of the mounting track are appropriate mounting studs or one of a plurality of T-shaped projections on a cluster mounting bracket.

Abstract: A gas tube arrester subassembly for use in a modular component type telephone central office protection system includes a gas tube arrester having a spacer tube with an electrode at each end. One of the electrodes is insertable into an open end of a generally cylindrical shell portion of the gas tube arrester subassembly with parts of the shell portions at the open end being swaged to form securing members to maintain the one electrode in the shell portion. The other end of the shell portion is closed with a generally rectangular slot therein. Removably mounted in the slot is a conductive U-shaped spring member such that the spring member has one leg extending along the inner surface of the closed end. Disposed between the one leg and the one electrode is a conductive disk-shaped contact member to couple the one electrode to the spring member.

Abstract: A connector block for mounting plug-in type protector assemblies to protect telephone equipment from high voltage and current surges occurring on incoming telephone lines includes an elongated, relatively narrow mounting panel having a mounting end portion at either end. Disposed along the mounting panel is a plurality of socket groups arranged in a single column and a plurality of terminal hole groups arranged in a single column adjacent the socket groups, each of the terminal hole groups being associated with one of the socket groups. Each of the socket groups contains four line terminal contacts and a ground terminal contact. The ground terminal contact in each of the socket groups has a holder portion extending from a rear face of the mounting panel to which is coupled a single ground terminal bus bar. The ground terminal bus bar is coupled to grounding plates positioned adjacent the rear of each of the end portions.

Abstract: An induction cancellation circuit is used to minimize the effects of AC induced signals appearing on a pair of telephone lines on the activation of a current sensor by a DC loop current flowing on the telephone lines. An input of the current sensor is coupled to one of the telephone lines by a coupling resistor so as to receive energizing potentials from both the AC induced signals and the DC loop current. On the other hand, the having an cancellation circuit includes an amplifier having an amplifier input coupled to the other telephone line by a DC blocking capacitor. The amplifier is biased at unity gain and provides an output signal equal to but 180.degree. out of phase with the AC induced signals received at its input.