Abstract: A protector module (30) for protecting tip and ring conductors of a telepe loop includes a pair of protector assemblies (40--40') which are supported within a common housing (32). A voltage protection subassembly (42) of each protector assembly is connected electrically to a grounding subassembly (44) for causing current associated with excessive voltage surges to be conducted to ground. Each protector assembly also includes a current protection subassembly (41) which comprises a dielectric base, as well as a tubular line pin (61) and a central office pin (57) which are connected together electrically. A shunting element (62) is disposed concentrially about and is supported at one end of the line pin in an initial position by a pellet (70) of a fusible material which extends between a closed end of the shunting element and an edge surface (68) of an open end of the line pin.

Abstract: A method for automatically determining the refractive index profile of a lightguide preform.

Abstract: A transfer pin (40) simultaneously transfers a die (10) to an adhesively ted, electrically conductive cup (23) while depositing adhesive on the upper surface of the die for subsequent bonding.

Abstract: An optical fiber cable includes a first jacket, typically comprising a polyvinyl chloride material, a core member comprising at least one, typically .ltoreq.10, optical fiber(s), and a core wrap loosely surrounding the optical fiber(s). The optical fiber(s) typically is (are) slightly overstuffed. The cable further comprises three non-metallic strength members (or groups of strength members) completely embedded in the first jacket and coupled thereto. In cables containing three strength members, the coupling is typically characterized by a pull-out strength of at least 25, preferably more than 40, lbs/in of strength member. Each strength member comprises a multiplicity of impregnated filaments, preferably borosilicate glass filaments impregnated with a urethane. The preferred cable typically has a circularly symmetric cross section, with the three strength members, each of radius r.sub.s, disposed longitudinally, their axes a distance R from the axis of the first jacket, with R>1.155(r+r.sub.

Abstract: A biconic connector includes two plugs (44--44) each of which terminates a single fiber optical cable (55) and each of which includes a conically shaped end portion (50). The connector also includes an alignment sleeve having back-to-back conically shaped cavities each of which is adapted to receive an end portion of a plug. In order to minimize loss through a connection, it becomes important for the axis of the end portion of the core of the optical fiber in the conically shaped end portion of the plug to be coincident with the axis of revolution of the conically shaped end portion. This is accomplished by holding the plug in a fixture such that its conically shaped end portion is exposed and the fixture adapted to be turned about an axis of rotation. Images of light launched into the optical fiber are acquired in two planes at a plurality of positions spaced apart along a reference axis.

Abstract: The addition of a low viscosity (2 to 100 centipoise) polysiloxane such as olydimethylsiloxane to a two-part heat curable polysiloxane system substantially eliminates the formation of bubbles when such system is employed as a potting compound for encapsulating devices such as electronic devices.

Abstract: In an electronic device assembly comprising at least one circuit element an encapsulant therefor, wherein the encapsulant comprises a silicone resin characterized in that subsequent to the curing of said encapsulant, the resin is coated with a fine inorganic powder such as fumed or fused silica which essentially eliminates static charge and tackiness of the surface.

Abstract: A method for preventing unwanted continued polymerization with aging of a lymer, e.g., a silicone gel, which was catalytically cured comprises treating the cured polymer with a catalytic deactivating agent or stabilization of cured resin.

Abstract: A modular adapter (30) includes a housing (33) having a plug end portion ) and a jack end portion (35). The jack end includes two stacked jack cavities (54-54'). Each of the jack cavities has a stepped portion (75) depending from the ceiling on each side of the centerline of the cavity. The stepped portions in each cavity are spaced apart a sufficient distance to receive a locking tab (41) of a modular plug (31) which is inserted into the cavity. The plug may be a six or an eight conductor plug. A first group of contact elements (36--36) extend from retroflexed end portions in one of the jack cavities into cells formed in the plug end portion. An additional two contact elements (37--37) comprising a second group have retroflexed end portions on one side of one jack cavity and extend to center positions in the other jack cavity.

Abstract: An off-line regulating power supply utilizes a regulating transistor which perates in a dissipative mode for only a portion of each half cycle of an input AC voltage in order to regulate an output voltage by truncating the input AC sinewave. This AC input signal is full wave rectified and coupled to a primary winding of a power transformer through the regulating transistor. One of a plurality of secondary windings is coupled to a voltage threshold detector which responds instantaneously to attainment of the threshold in each half cycle of operation to bias the regulating transistor from a saturated condition to an active dissipative impedance state which limits the output voltage to the threshold level. As the input AC sinewave peaks and declines in value, the regulating transistor is again biased into saturation when the voltage applied to the threshold detector drops below the threshold level.

Abstract: A lightguide preform is fabricated by depositing a thin carbon layer (40) on a cylindrical glass mandrel (30) and further depositing a plurality of glassy soot layers (32) thereover. The resulting composite structure is heated, in a furnace, at a low temperature to remove the carbon layer (40) and then heated at an elevated temperature to consolidate the glassy soot layers on the glass mandrel to form the lightguide preform.

Abstract: A telephone cord employs as an insulator for the conductors therein an extrudable blend of a styrene-ethylenebutylene-styrene copolymer with polypropylene.

Abstract: The invention relates to a modular jack for telephone equipment. The jack has a pair of switch contact springs which are activated only when a plug of a specific shape is inserted into the jack.

Abstract: A spool (20) which is used in the taking up and the paying out of a relatively long length of optical fiber includes two flanges (24, 26) and a hub (22) with each flange being tapered. The spool includes a collector (30) which is formed adjacent to one of the two tapered flanges of the spool and which provides access to the initial or leading end portion of the length of optical fiber which is wound on the spool. A groove (32) of the collector communicates with the hub of the spool through each of the two diametrically opposed slots (28--28) in the adjacent tapered flange (24). This allows the optical fiber to be wound on one of two coaxially mounted spools and to be transferred to the other spool with the first few convolutions being received in the groove and then passed through one of the slots in the adjacent tapered flange onto the hub.

Abstract: A control circuit for a lightpen of a random scanning computer graphics sem (10) enabling the detection of lightpen interrupts or hits on contiguous vectors having drawing periods shorter than the response time of the lightpen (13). The lightpen interrupts are temporarily held in a peripheral circuit (31,32,34,36) and are selectively released to the computer system (via 29,21) at the end of its INTERPRET phase, i.e., at the end of a period during which the display processor decides how to handle the next display instruction. The present arrangement, which prevents the arrival of the lightpen interrupt signal during the INTERPRET phase, achieves a computer graphics system exhibiting maximum use of the information furnished by lightpen hits.

Abstract: A parallel data transmission system (20) comprises a cable (40) which is capable of balanced mode transmission but which is driven in an unbalanced mode. The cable includes a plurality of twisted pairs of individually insulated conductors (42--42) enclosed by a metallic shield (54). The twist lengths are relatively short to cause the pairs to be decoupled sufficiently from one another to allow substantially error-free, parallel transmission over relatively long distances. Interposed between the core and the shield is a spacing member (52) which has a relatively low dielectric constant. Receiving facilities are provided for detecting whether the level of transmitted signals is above or below predetermined threshold values and for converting the received signals into one of two or more logic levels. Advantageously, this system increases substantially the distances over which substantially error-free transmission in an unbalanced mode can be accomplished.

Abstract: A system for transmitting traces of an oscilloscope (16) to a remote location for analysis comprises a transmitter circuit (18) which digitizes and transmits the traces to the remote location via a first modem (20), and a receiver circuit (24) at the remote location, for receiving via a second modem (22) the transmitted signals and delivering these signals to a destination oscilloscope (26). At the transmitting location, the vertical output signal of the oscilloscope is amplified and fed to an analog-to-digital converter. The digitized output signal of the converter and the oscilloscope's timebase gate signal are stored in a memory circuit and subsequently transmitted to the remote location via the first modem (20). At the remote location, the receiver circuit (24) comprises a universal asynchronous receiver transmitter (UART) interfacing with the second modem (22), a memory circuit for storing the transmitted signals, and associated circuitry for restoring the oscilloscope signals's amplitude.

Abstract: A connector (10) having two rows of opposed terminals (11, 12) joined by a pair of solder bars (13, 14) is mounted on a printed circuit board (16) with the terminals overlaying circuit board edge contact pads (15, 19) on opposite sides of the board. The assembled connector and circuit board is placed in a fixture whereafter pairs of comb devices are manipulated to position the comb tines between adjoining pairs of terminals. The fixture is conveyed at a fast rate in a first direction past a pair of heaters (34, 35) for preheating the two rows of terminals, the solder bars, and the circuit board pads. Next, the fixture is returned in a second opposite direction at a slow rate past the heaters to melt and thereby solder bond the comb held terminals to their corresponding board pads.

Abstract: A method of forming a direct contact lens on a light emitting device strure is disclosed which facilitates the formation of large arrays of light emitting devices. The method uses a printing fixture including a large number of vertically oriented pins which is dipped into a bath of a liquid epoxy material. The printing fixture is then placed over the array structures and lowered until the pins contact the diodes. When the printing fixture is subsequently raised, the lens material will adhere to the associated devices and flow to completely encapsulate the device and a substantial portion of the device mounting structure.