Abstract: A system for transmitting video signals from multiple video cameras over one or more multiple pair, twisted pair cables includes several video cameras and a plurality of twisted pair-to-coax balun “T” devices connected to the video cameras by coaxial cables. The video cameras generate unbalanced video signals. The twisted pair-to-coax balun “T” devices are connected together in a “daisy chain” fashion by electrical cables having multiple twisted pairs of wires. The balun “T” devices convert the unbalanced video signals from the cameras to balanced video signals. The balanced video signals are transmitted over the multiple pair, twisted pair cables to a hub, which provides the video signals to one or more monitors, a DVR, a multiplexer or other device.

Abstract: A return loss bridge circuit for testing a balanced test impedance includes an input connector and a reflection connector. The input connector and the reflection connector are electrically connected to an output of a network analyzer and an input of the network analyzer, respectively. The return loss bridge circuit further includes a reference impedance connected between the input and reflection connectors, first and second transformers and a common mode choke. The common mode choke is electrically connectable to the balanced test impedance.

Abstract: A video surveillance system includes a first combiner, and a monitor, a power source and a camera control unit, each of which is electrically coupled to the first combiner. A regulated combiner located remotely from the first combiner and being electrically connected to the first combiner with at least one twisted pair of wires includes a voltage regulator which provides a regulated voltage to the camera located remotely from the first combiner. The camera is operable at a predetermined voltage level. The power supply provides an increased voltage to the regulated combiner through the first combiner and the twisted pair of wires to compensate for IR losses in the twisted pair of wires. Thus, the regulated combiner reduces the increased voltage to a safe level for the CCTV camera and other devices on a network to operate properly. The system dramatically increases the distance that a power supply can be located from where the camera is located, which decreases installation costs for CCTV surveillance systems.

Abstract: A longitudinal balance measuring bridge circuit includes a common mode signal injection circuit in the form of a center tapped, 4:1 balanced matching transformer. The signal injection circuit is coupleable to an item under test (IUT) and to a source of common mode signal, and provides the common mode signal to the IUT. The common mode signal injection circuit includes balanced outputs. A common mode filter is coupled to the balanced outputs of the common mode signal injection circuit and attenuates the common mode signal. The common mode filter also includes balanced outputs on which are provided a transverse signal resulting from the common mode signal provided to the IUT. A signal output balun is coupled to the balanced outputs of the common mode filter and converts the transverse signal to an unbalanced signal.

Abstract: A connector module permits termination of cross-connect wires on one surface (front) and cable wires on an opposite surface (rear). The module exhibits a configuration, which permits test access and protector (i.e., protection module) mounting from the front surface. The jumper wires are inserted from a side surface through wire guides or channels that bring the wires from the side surface to the front surface where the wires can be terminated without impeding insertion and removal of protection modules from the front of the connector module. There is an intermediate surface below the front surface that is accessible from the front and recessed to allow protection modules to be installed completely below the terminated wires, allowing termination and maintenance of jumper wires after the protection module is installed from the front.

Abstract: A connector module permits termination of cross-connect wires on one surface (front) and cable wires on an opposite surface (rear). The module exhibits a configuration, which permits test access and protector (i.e., protection module) mounting from the front surface. The jumper wires are inserted from a side surface through wire guides or channels that bring the wires from the side surface to the front surface where the wires can be terminated without impeding insertion and removal of protection modules from the front of the connector module. There is an intermediate surface below the front surface that is accessible from the front and recessed to allow protection modules to be installed completely below the terminated wires, allowing termination and maintenance of jumper wires after the protection module is installed from the front.

Abstract: A balanced spectrum limiter for limiting the frequency spectrum of signals transmitted through a telephone or communication system includes one or more filters and an energy surge protection circuit. Each filter includes a pair of inductors wound around a single core and a capacitor connected between the two inductors. The energy surge protection circuit can be any type of energy surge protection circuit known in the art. The range of frequencies which can be transmitted is determined by the filter. The filter is removably connected to the energy surge protection circuit so that filters of varying parameters may be easily interchanged.

Abstract: The present invention is a surge protector circuit and method of protecting electronic equipment which do not load down a circuit at high frequencies and do not degrade a signal in high speed data transmission. A gas tube is connected in parallel with low capacitance diodes and an avalanche semiconductor device, such as a TVS. The diodes and the avalanche semiconductor clamp the voltage transient and allow the slower gas tube more time to fire, discharging the surge. The addition of the low capacitance diodes in series with the avalanche semiconductor, reduces the line-to-line and line-to-ground capacitances of the surge protector and keeps the surge protector circuit from loading down the rest of the circuit and degrading the signal.

Abstract: A modular distributing frame for supporting telephone connector blocks for single person front jumper administration. The connector blocks are mounted in vertical columns having vertical troughs on both sides. Horizontal troughs are located at the top, bottom and an intermediate location while being in the same plane as the vertical troughs.

Abstract: The invention is a fiberoptic coupler formed by multiple optical fibers each having a core and a surrounding cladding and at least one spacer fiber having the refraction index substantially matched to the refraction index of the cladding of at least one adjacent optical fiber. The optical and spacer fibers are arranged, over a region extending axially through a limited length coupling region, in a side-by-side configuration wherein each fiber touches neighboring fibers. The coupling region is created by laterally fusing all fibers and is adapted to couple propagating modes of light between the optical fibers. Various configurations of the coupler include an arrangement of seven equal diameter fibers with a center fiber surrounded by six fibers, or an arrangement of nineteen equal diameter fibers with a center fiber surrounded by a first ring of six close-packed fibers and a second ring of twelve close-packed fibers.

Abstract: In one aspect, the invention concerns fused fiber optic couplers of the type formed from fibers of transparent substance each having a circular cross-section of preselected diameter. The fibers include a central fiber and at least one ring of closely packed surrounding fibers with at least some of the fibers being optical fibers that have a core and a surrounding cladding. The coupler is formed by the processes of providing the fibers, assembling them in a close-packed relationship, and heating and drawing the assembly of fibers in the close-packed region.We have discovered that the steps involved in forming such a coupler, introduce slight size variations that can seriously affect the performance of the coupler, and that these slight variations can be accommodated by slight, controlled, under-sizing of one or more of the surrounding fibers or over-sizing of the central fiber.

Abstract: A telephone protector module utilizing a three element gas tube discharge device and having heat-actuated overload protection means causing both tip and ring circuits to be simultaneously grounded upon the occurrence of an overload.

Abstract: An improved connector block comprises a molded main body portion having test pin and connection-effecting pin couplet fields orthogonally disposed therein. In service, as on a telephone central office main distributing frame, the block receives and terminates two wire groups (e.g., subscriber lines and switching equipment conductors), selectively establishing connections therebetween via couplet pin joining plug connectors. Internal conductors connect each cross connection implementing pin couplet to an appearance in the test pin field.The connector block assembly reliably effects circuit interconnections employing minimal wire wrap junctions; may be readily and relatively inexpensively constructed; and may be flexibly and efficiently installed and utilized.

Abstract: An improved telephone line protection device including means for grounding excessive currents and voltages. The disclosed embodiments include temperature actuated resilient means for shorting currents directly to a source of ground potential without passing such currents through the elements normally present for protecting against excessive voltage surges, which are damaged by carrying excessive currents.

Abstract: Line condition reporting and subscriber polling apparatus employs a central processor for accessing subscriber cable pair via one of plural interface circuits, a trunk selection matrix, a test or no-test trunk, and the subscriber's central office.Subscriber lines may be seized in accordance with manual or automatically entered information via system input terminals, and an operative code-forming part of the input command, determines whether the system will operate in a line testing and/or polling (as utility meter) mode. In accordance with one aspect of the present invention, digital computer apparatus is employed both for data processing and assembling purposes, and also for circuit control. Further, such circuit control is advantageously effected by a dedicated microprocessor with ancillary instruction (ROM) and read-write (RAM) memories.

Abstract: An improved telephone connector block including grounding means enabling the provision of current and voltage overload protection. Protector modules are provided with a grounding prong having a detent groove arranged peripherally thereabout at a free end thereof which engage a detent in a grounding strip on the connector block to simultaneously accomplish a grounding function and a resilient locking function.

Abstract: A line voltage surge protecting device for telephone systems which normally include means for grounding excessive currents caused by lightening and the like. The device includes a gaseous discharge element which becomes conductive when the voltage in the line being protected momentarily exceeds a predetermined value to conduct current to a source of ground potential. A temperature sensitive element responsive to heat generated by the gaseous discharge device during prolonged excessive current serves to short the gaseous discharge element to ground. The temperature sensitive element includes means resiliently biasing the gaseous element for movement serving to short the same. A soldered retaining means opposes such movement, and heat developed in the gaseous discharge device is transmitted to the soldered means by conduction to melt the solder to permit the shorting action to occur.

Abstract: A talk line multiple communication and test apparatus for use in conjunction with telephone central office frame equipment and comprising a housing, a face plate, and a standard type rotary switch member having a plurality of positions mounted on said face plate and said housing having at least one input and at least one output connector of the Amphenol type fixedly connected thereto and disposed therewithin, means for electrically connecting said rotary switch with respect to said input and output connectors, said input and output connectors being of the panel mount type and being adapted to receive a mating connector in mating engagement therewith, at least one input jack mounted on said face plate and means for electrically connecting said input jack to said rotary switch, and a bias connector clip member which is positionable between an interior wall of said housing and pairs of mated input and output connectors to maintain the same in mated engagement for secure and positive electrical connection, wherei

Abstract: A device for indicating the status of one or more individual telephone lines with respect to whether the receiver is off hook or ringing without the necessity of dialing the line. A light-emitting diode and a neon lamp are positioned adjacent a discrete aperture visible to a user. The light-emitting diode responds to the presence of 24-volt normal tip line current, and is protected by a Zener diode against dial pulse currents employing ringing voltage. The neon lamp, in conjunction with a condensor carries the ringing current, and is so positioned adjacent the light-emitting diode that a glow in the neon tube is made to appear as an illumination of the light-emitting diode, whereby both bosy conditions appear to be indicated on the same light source.