Abstract: In order to protect electrical and fiber optic cables in a central telephone office terminal equipment frame, the cables are controlled and managed so as to be releasably retained in a service loop within a fiber management panel. The releasable retention is performed by a stretched extension spring selected, dimensioned and stretched in such a manner with respect to the diameter of the cables that each cable can be gently but firmly retained when pressed into the gap between adjacent coils. The retention spring permits emergency release of the cable in the event of mishandling of the equipment by service personnel.

Abstract: A process is disclosed for the transmission of data between subscribers of a public dial telephone system in which at least a telephone, a data modem having a tone transmitter and a tone receiver, and a data device are connected to the dial telephone system. The data modem is equipped with a circuit for ringing voltage detection with bridging of ringing pauses. For transmission of a data answering tone and, if applicable, for selection of a channel position, in the case of manual operation, after operation of a data key, a distinction between the `called` state and `calling` state is made according to whether, at the start of loop current, a ringing voltage was detected by the data modem or not.

Abstract: A variable length shift register is formed of a plurality of flip-flops arranged to form separate shift registers of different lengths. The shift registers are interconnected by multiplexers which connect either the input or the output of each shift register to the input of an adjacent shift register. Control signals are provided to the multiplexers to controllably select the length of the variable shift register by selectively inserting shift registers into the variable shift register and bypassing others.

Abstract: A system for aligning framing bits from independent digital transmission facilities with framing of a higher transmission rate facility includes a RAM memory. Received framing bits from the independent digital transmission facilities are stored at RAM locations in accordance with multiframe addresses of the framing bits relative to the multiframe format of the independent facility. Multiframe indicator bytes indicative of the framing of the higher transmission rate facility are used as addresses to read framing bits from RAM. The multiframe address of the independent digital transmission facilities is established by a counter for each independent facility, said counter being synchronized to the framing of the independent facility and incremented to provide addresses identical to the multiframe indicator bytes of the higher transmission rate facility.

Abstract: An electro-optical module has at least threee ports, with at least one port having an active electro-optical device for connection to electrical circuitry and at least one port having an optical port for connection to an optical fiber link. A passive coupler interfaces the various ports. The passive coupler is formed of optical fibers mounted on glass using an adhesive that exhibits refractive index-matching characteristics. The fiber-on-glass coupler is extremely small, allowing for the module to have minimal size. The coupler may be wavelength selective or wavelength insensitive. If a wavelength-selective coupler is utilized, the end surface of an optical fiber is coated with a dichroic filter to provide wavelength sensitivity. An optical fiber adapted to receive light for connection to a detector is selected to be a multi-mode fiber to increase reception of light. The remaining fibers may be single-mode fibers.

Abstract: A parallel pseudo-random generator emulates a serial pseudo-random generator which in turn is defined by a polynomial of the type 1+x.sup.M + . . . +x.sup.P ; that is, wherein the serial outputs are generated such that the next serial output value is based upon an Exclusive OR combination of at least two preceding serial output values. The parallel pseudo-random generator comprises latches and Exclusive OR gates, the number of latches and Exclusive OR gates each being at least equal to the polynomial order of the serial pseudo-random generator defining polynomial. The outputs of the latches represent the outputs of the parallel pseudo-random generator and may be used to scramble data on parallel data lines. A method is disclosed for determining the interconnects between the latch outputs and the Exclusive OR gate inputs based upon the number of latches and the serial pseudo-random generator defining polynomial.

Abstract: A remote control transmitter includes a function selector device (17) for outputting selection signals in dependence on a function selected by operating the device. A function is selected by tilting the function selector device which includes optically functioning tilt switches. For this purpose, a ball guide housing (50) is constructed with five ball resting places, i.e. places in which a ball (K) within each specified tilt range always adopts a stable position. At one of the ball resting places a light transmitter (D) is mounted, while at other ball resting places light receivers (P1-P3) are located. A multi-bit signal is outputted by the light receivers, with the different bit sequences corresponding to different selection signals.

Abstract: The optical fiber cable has a plurality of centrally located optical fibers. Carrying the optical fibers is a gel-filled plastic buffer tube. A plurality of radial strength yarn threads extended along the outside of the buffer tube in a contra-helical pattern. In the armored cable embodiment, a strength and protective member in the form of a corrugated steel armor layer may be provided for additional protection against possible rodent damage. The armor is usually coated with a thin layer of plastic material in the form of a water blockable flooding compound. A ripcord is provided to assist in removal of the armor. A final polyethylene outer jacket is provided for additional cable protection. Embedded within the outer jacket is a pair of diametrically opposed, longitudinally extending strength members.

Abstract: A switch controller for a dynamic switch responds to command from a using system to provide control signals to the dynamic switch which causes the switch to establish and breakdown paths between sources and destinations in the using system. The controller includes a plurality of command registers which are temporarily assigned to a command source for receiving command signals, decoding said signals and providing control signals to the switch for establishing or breaking down a switch path. The controller may if desired provide an echo to a selected destination so that proper execution of commands may be ascertained. After the commands are completed the control register is released for reassignment to another command source while an established switch path remains intact. Thus, commands may be received from any source for controlling the switch.

Abstract: After it has been evacuated, a liquid crystal cell whose filling hole is located at a corner of the cell is immersed into a liquid crystal material inside a vacuum jar and immediately raised again, whereby a drop of liquid crystal material forms at the filling hole. Then the vacuum jar is quickly aerated and the cell is filled outside the vacuum jar. The volume of the drop and the volume of the cell have to be brought into line with each other in such a way that the drop volume is at least as great as the volume of the cell interior so that filling can take place with the drop volume only.

Abstract: A control method and apparatus for an electronic system having a plurality of functional elements, both intelligent and non-intelligent, interconnected by a plurality of time-division multiplexed serial data links, wherein information is normally conveyed in time slots on the data links. Control information is exchanged between the elements by using one or more of said time slots as control channels for all control information. The format of the control information is compatible with both the intelligent elements and non-intelligent elements. The control information format includes a plurality of bits for providing command data, a plurality of address bits, a valid bit to indicate that the information being transmitted is a valid message, an interrupt bit to signal a microprocessor in an intelligent device to interrupt and service the message, and a parity bit for error checking.

Abstract: A coil-carrier half (11) for a saddle-coil arrangement for a cathode ray tube accomodates a saddle-coil winding, in a front groove (13), a rear groove (14), left slots (18.11-18.51) and right slots. Prolongation of the left slots in comparison with the right slots results from the presence. in a rear wall (15.h) of a front-groove, at the positions where the left slots open out into the groove, of steps which are greater towards the front than at the fan-out positions of the right slots.In an asymmetrically built coil-carrier half of this sort, turns (12)' are introduced in each slot so that they run towards the prolongation position of the slot. This produces a saddle-coil arrangement which leads to fewer image defects than when a conventional saddle-coil arrangement with symmetrical coil-carrier halves is used.

Abstract: An n-way signal splitter having isolated outputs with a printed circuit board geometry providing the necessary crossovers with impedance lines, running under and orthogonal to resistive components, fabricated in microstrip on one side of the board, with a ground plane completely covering the other side, requiring no feedthrough holes or jumper cables to provide the necessary crossovers, and input and output connectors being fastened directly to the printed circuit board.

Abstract: Packet switching network with first and second cascaded parts, including first and second switching modules respectively. In the second switching modules, the path selection is controlled by routing information contained in the packets. In the first switching modules this selection is performed without using routing information only for a path set-up packet, while for the following packets use is made of routing information on the route followed by the path set-up packet. Each module decides to multiplex an input stream on an output only when a calculated traffic load is smaller than a limit value. This load is calculated from traffic load parameters contained in the path set-up packet.

Abstract: A filtering algorithm for the SONET H4 byte is implemented with circuitry including an internal H4 counter which is incremented each frame and is locked to a received H4 byte once every 24 frames if a proper bit sequence is detected in a designated frame. If the designated bit sequence is not detected, the counter is not reset and continues to be incremented. If parity errors are detected, the counter is not reset and is allowed to free run to simulate the appropriate H4 byte input.

Abstract: A pulling assembly for connectorized optical fiber cables is formed of a flexible metal braided hose portion for conveying a pulling force to said cable and for providing a chamber in which the cable connectors may be housed during a cable pulling operation. A cylindrical housing is attached to one end of said braided metal hose and includes a concentrically-arranged central strength member gripping apparatus and a buffer tube alignment structure disposed about the central strength member gripping apparatus. A crimping sleeve is attached to an opposite end of said cylindrical housing fixing said concentric arrangement within the cylindrical housing and being crimpably engageable with an outer surface of an optical fiber cable.