Abstract: Disclosed is a circuit for storing and processing information in channel units servicing four channels in a digital loop carrier transmission system. Separate registers are provided for processing information related to different pairs of channels. However, one of the registers duplicates the information included in other register so that only a single register need to be addressed for a particular function.

Abstract: Disclosed is a communications network for peripherals in a digital loop carrier transmission system. A broadcast STAR network is employed so that all peripherals receive any message which is broadcast by any of the peripherals. No peripheral broadcasts without clearance from the active communications hub. Two hubs can be provided to alternatively act as the active hub. Each peripheral includes a controller which transmits a request to send signal, multiplexes the request to send signal with an outgoing message, receives clear to send signals, and demultiplexes the clear to send signals from an incoming message.

Abstract: Disclosed is a method and apparatus for transferring data in an Integrated Services Digital Network (ISDN) system. Certain system information bits are displaced into time slot zero to permit the transmission of the B2 channel bits in the same assigned time slots as the B1 channel. D channel bits are also assigned to unused time slots.

Abstract: Proposed is a method and system for transferring end customer phone lines between different terminations at the central office. Transfer is accomplished through the creation of virtual remote terminals of a desired size and number at the remote terminal and an appropriate mapping of the channel units to these virtual remote terminals.

Abstract: A circuit is proposed for adjusting the loss provided to loops in digital loop carrier transmission systems. A constant current is supplied to the loop and the resulting voltage is measured to determine the resistance of the loop. This value is fed to a microprocessor with a look-up table which controls a programmable analog/digital converter. The loss at the output of the converter is a stepwise function based on the resistance of the customer loop.

Abstract: Disclosed is an optical fiber distribution apparatus where the fibers are organized in a horizontal position above or below vertically mounted circuit packs and recessed from the circuit pack faceplates. A fiber termination on a top or bottom edge of each circuit pack mates with connectors to the fibers in the horizontal position.

Abstract: Disclosed is a method and circuit for modifying the check code of a data packet based on a first seed to accommodate the addition or substraction of a header. A number of bits, which include a second seed, an exclusive OR function of the first seed and a portion of a header, and a string of zeros dependent upon the length of an incoming data packet, is sent through a CRC generator. The resulting CRC calculation and the incoming packet check code are exclusive ORed to produce a modified check code taking into account the addition or substraction of the header.

Abstract: Disclosed is a terminal housing with a wire entry system providing strain relief and a good seal. Two closed cell foam pads are mounted at each wire entrance port. The ports are shaped so that the wire can be inserted from the top of the housing and strain relief is provided where the wire comes to rest.

Abstract: Disclosed is a method and apparatus for applying flux and solder in order to attach connectors to printed circuit boards (PCBs). Flux is applied to the connector tails and the PCB pads by means of a roller mounted above a flux reservoir. The piece parts are then exposed to a solder wave such that the solder sticks only to the selected area to which the flux was applied.

Abstract: Disclosed is a circuit for adding loss to a signal in a loop carrier transmission system. As data is being transmitted, the circuit determines the digital output needed for an appropriate amount of loss for each channel unit at the end user interface.

Abstract: A frame organized time division multiplex communication system includes a central office and at least one remote terminal. A time division link connected between each remote terminal and the central office carries signals organized in time division multiplex frames. The central office determines the time division multiplex link frame format. Each remote terminal has at least one interface connected to the time division link that multiplexes signals into the time division multiplex frames, demultiplexes signals from the time division multiplex frames and monitors the time division frames from the time division link for in-frame and out-of-frame operation. An interface controller in the remote terminal determines the frame configuration of the interface multiplexing and demultiplexing. The controller identifies interfaces exhibiting out-of-frame operation and automatically switches the identified out-of-frame interfaces to an alternate frame configuration.

Abstract: Disclosed is a bridge assembly for mounting within a network interface unit. The assembly includes a jack and a housing for an integrated circuit which are molded into a single entity. The housing and jack are separated by a flexible hinge which permits the bridge assembly to be mounted in the chassis of the network interface unit.

Abstract: Disclosed is a module for connecting optical fibers in a lightwave cross-connect distribution system. The module includes a curved channel for receiving an optical fiber cable. The channel is open along a major surface of the module housing to permit the cable to flex out of the channel while the module is inserted or removed from a distribution shelf.

Abstract: Disclosed is a network interface unit which includes customer bridges and an array of circuits such as maintenance termination units (MTUs). The MTUs are provided on printed circuit boards, each including a male and female connector. Each board is inserted in between posts in the unit housing so that the female connectors plug into a mother board at the bottom. Jack wires are plugged into the male connectors and extend to the customer bridge portion of the unit.

Abstract: Disclosed is an apparatus for the optical interconnection of circuit packs and components mounted on circuit packs, and a method of manufacture. Optical fibers are bonded to a flexible substrate. The substrate includes tabs that can be terminated by standard V-groove silicon chip connectors for optical connection to the edges of circuit packs.

Abstract: A transmitter including a continuous phase FSK modulator is disclosed for use primarily in optical transmission. The output frequencies are achieved by switching a capacitor into and out of an oscillator circuit by means of a PIN diode switch network which is responsive to a binary data input. The resulting sinusoidal waveforms are squared up by means of an inverte with feedback control for adjusting the duty cycle.

Abstract: Disclosed is a connector which permits optical connections between a circuit pack and backplane. The optical components are mounted on a major surface of a circuit pack near the edge. Optical fibers are mounted within a housing which is secured to the backplane. The use of springs within the housing gives sufficient tolerances so that the fibers are aligned with the components when the circuit pack is inserted within a shelf.

Abstract: Disclosed is a means for aligning contact leads in electrical connectors. An alignment strip includes a pair of slidably mounted sheets, each defining an array of openings having wide and narrow portions. The sheets are initially positioned so that the wide portions of corresponding openings in the two arrays overlap to permit easy insertion of the leads. The sheets are then shifted to align the narrower portions of the corresponding openings so that the leads are held in place in their proper location.