Abstract: A modular jack assembly for connecting and switching computer network cables. The jack assembly includes at least one jack module with two sets of connectors for linking wires from cables to the module and at least one jack. The modules within jack assembly slide between a first position and a second position. In the first position, the two sets of connectors linked to cables are electrically connected to each other, allowing normal through signals transmission. In the second position, the electrical connection between the connector sets is broken and the plug contacts within each jack are linked to one of the sets of connectors, allowing pass-through connections, such as a cross-connection, to be made.

Abstract: A tool for installing and extracting a fuse is provided. The tool has a first bar that has a jaw at one end of the first bar. The tool has second bar that is slidably attached to the first bar and that has a jaw at one end of the second bar. The respective jaws are adapted to align by sliding the respective bars relative to each other to retain the fuse between the respective jaws.

Abstract: A fiber optic cabinet has internal aligned guides on opposite sides of an axis opening. A splice tray has a planar tray base with a tray axis orthogonal to the base. The base has a peripheral edge sized for opposite portions of the peripheral edge to be slidably engaged with opposing ones of the aligned cabinet guides. The tray base is slidably received within the aligned guides regardless of a rotational position of the tray base about the tray axis. A fiber pathway guide is carried on the tray base for receiving a wound amount of optical fiber on the guide as the tray base is rotated about the tray axis.

Abstract: An integrated circuit for amplifying a signal and having an input that receives the signal and an output that outputs an amplified signal is provided. The integrated circuit has a first switch having at least two outputs. The first switch is coupled to the input of the integrated circuit and receives the signal from the input of the integrated circuit. In addition, the integrated circuit has a second switch having at least two inputs. The second switch is coupled to the output of the integrated circuit and transmits the amplified signal to the output of the integrated circuit. The integrated circuit has a first transistor that has a noise figure, an input coupled to one of the outputs of the first switch, and an output coupled to one of the inputs of the second switch. Moreover, the integrated circuit has a second transistor in parallel with the first transistor.

Abstract: A wireless communication system. The wireless communication system includes a first wireless communication network communicating at a first range of frequency. The wireless communication system also includes a second wireless communication network that is communicatively coupled to the first wireless communication network. Additionally, the second wireless communication network communicates at a second, different range of frequency. Further the first communication network geographically overlaps with a select portion of the second communication network.

Abstract: A digital to analog converter is provided. The converter includes a multi-bit counter, a first and a second plurality of logic gates coupled to the multi-bit counter, a digital input selectively coupled to the first and second plurality of logic gates. The converter further includes a first AND gate coupled to an output of the first plurality of logic gates and a second AND gate coupled to an output of the second plurality of logic gates. In addition, the converter includes a clock coupled to an input of the first and second AND gates and an input of the multi-bit counter and a filter coupled to an output of the first and second AND gates, wherein the filter includes an output for an analog signal based on the digital input.

Abstract: A scanning method for establishing communication between a head end and a plurality of remote units in a multi-point to point communication system is described. The method includes transmitting information from the head end to the plurality of remote units in a plurality of regions of a first frequency bandwidth, each of the regions having at least one control channel associated therewith, identification information corresponding to each of the remote units of the plurality of remote units being periodically transmitted from the head end on the at least one control channel of one of the plurality of regions of the first frequency bandwidth.

Abstract: An electronic system is provided. The electronic system includes a logic device and at least one input/output interface coupled to the logic device. The electronic system further includes an input/output (I/O) device with memory coupled to the at least one input/output interface, wherein the memory of the I/O device is mapped as an address space region that is directly readable and writable by a processor.

Abstract: There are disclosed methods and apparatus for testing memory components for faults, defects or the like, by generating a testing sequence that produces various bit combinations as well as current changes, that when coupled, stresses or fatigues the memory component, and allows for the evaluation of single bits. The testing sequence is provided in cycles, formed of complement word pairs of N bit words. The first, or initial, cycle typically includes a first word of all binary zeros. Successive or subsequent cycles include a shifted bit in each subsequent first word. The testing pattern is written into the memory component(s) under test and corresponding words are read from the memory component(s). The written and read words are then compared, with this comparison analyzed for detection of faults, defects or the like in the memory component(s).

Abstract: A method of ring protection is provided. The method includes feeding traffic on two transmission rings at a head end node and summing all traffic received on the transmission rings at the head end node. When a facility failure is detected, by a remote node, on one of the two transmission rings, transmitting forward alarm signals on the one transmission ring and return alarm signals on the other transmission ring and globally selecting the one transmission ring to transmit traffic and the other transmission ring to receive traffic from the head end node. When a remote node receives a forward alarm signal, the remote node passes the forward alarm signal on the transmission ring on which the forward alarm signal was received and globally selects the transmission ring on which the forward alarm signal was received to transmit traffic and the other transmission ring to receive traffic from the head end node.

Abstract: Fiberoptic connector and adapter assembly includes a fiberoptic connector received within an adapter. The connector has a cover on the connector housing. The cover pivots between open and closed positions to expose or cover, respectively, a optical fiber contained within the connector. Longitudinal guides of the connector are received cooperating with longitudinal guides of the adapter to direct the connector into the adapter in a prescribed alignment. A cam pin is carried on the adapter to engage a cam pin receiving slot ok the cover to urge the cover to the open position as the connector is inserted into the adapter.

Abstract: A cable exit trough is mountable to a lateral trough section either during initial assembly of the cable routing system, or at a later date. The exit trough includes a bracket portion mountable to the top edge of one of the sides of the lateral trough section. Two lead-ins are provided to lead the cable in an upward direction from the lateral trough section to the exit trough. The exit trough includes an exit trough portion extending from the bracket portion upwardly away from the lateral trough section. The exit trough portion includes a convexly curved bottom trough surface, and two convexly curved upstanding sides. The exit trough portion and the lead-ins define a cable pathway from the lateral trough section to an exit point of the exit trough portion which can either lead downwardly relative to the lateral trough section, or horizontally.

Abstract: A cable management system (20) is provided including a rack (22) for holding telecommunications equipment (24), and a ribcage cable support member (60) along a vertical side of the rack. The ribcage cable support member includes a plurality of forwardly and rearwardly extending ribs (116, 118). The ribs each include cable retention tabs (124). A plurality of spools (70) are provided for cable storage on the ribcage cable support member. Holes (82) through the ribcage cable support member allow access between the front and rear portions. An additional rack may be positioned on an opposite side of the ribcage cable support member to the first rack, and two columns of ribs are provided. Resilient plastic edge protectors (150) may be fitted onto the ribs (119).

Abstract: A modular cable management trough system and method of assembly. Cable management trough includes a trough body having first and second terminal ends, first and second upright walls extending between the first and second terminal ends, and a base wall between the first and second upright walls, extending between the first and second terminal ends. The first and second upright walls and the base wall define a generally U-shaped trough having an open top and a trough interior for receiving at least one telecommunications cable. The trough body defines a receiving channel at the first end of the trough body. The channel has upright portions along the first and second upright walls and a base portion along the base wall. The channel may slidably receive a flanged end of an adjacent trough section in order to couple the adjacent trough section to modular trough section.

Abstract: The present disclosure relates to a rack for mounting telecommunication chassis each adapted for receiving cross-connect modules. The rack includes a frame defining a bay formed between two spaced-apart, vertical end walls. The bay is sized for receiving the telecommunication chassis. The rack also includes a cable management structure connected to the frame. The cable management structure defines first and second separate vertical channels. The first vertical channel defines a first passage area sized for receiving a plurality of cross-connect cables from the telecommunication chassis. The second vertical channel defines a second passage area sized for receiving power and ground wires from the telecommunication chassis. L-shaped tie brackets are positioned in vertical channels defined by the vertical end walls. The tie brackets assist an installer in installing and tying the input and output cables to the rack.

Abstract: A fiber optic switch package and method of assembling the same with improved protection of the fibers and simple assembly. A fiber support device has passages that receive optic fibers and help align those fibers with respect to an optic switch component. In addition, the fibers that extend into the interior of the fiber support device are isolated from strains that may occur on the fibers that extend external to the fiber support device.

Abstract: Techniques for etching a wafer layer using multiple layers of the same photoresistant material and structures formed using such techniques are provided. In a method, first, multiple layers of the same photoresist material are formed over the wafer layer to form a composite photoresist layer. The composite photoresist layer is patterned and developed to form a patterned photoresist layer. Exposed portions of the wafer layer are then removed using the pattern photoresist layer. Each of the multiple layers of photoresist may, for example, be formed to a maximum rated thickness for the photoresist material. Structures formed using this process may have relatively small dimensions (e.g., widths of 5 microns or less or a spacing or pitch of 5 microns or less). In addition, structures may also have sidewalls which are relatively long, smooth, and/or vertical.

Abstract: A method of transmitting data in a communication system is provided. The method includes adjusting upstream power levels in a multipoint-to-point communications system having a head end and a plurality of service units is provided. The method includes measuring power levels of signals from the service units at the head end and comparing the power levels with a nominal power level. Further, the method provides at least one coarse adjustment at the service units to correct for large variations between the measured power level nominal power level and at least one fine adjustment at the head end to correct for smaller variations between the measured power level and the nominal power level.

Abstract: An optical switch formed on a substrate with receiving channels defined by alignment grooves formed in the substrate that are offset from alignment grooves that form the inputting channels. The offset receiving channels reduce the output power differentiation from an optical switch in which there is no offset.

Abstract: A cavity filter assembly is provided with at least one structural cavity wall comprising a circuit board. The circuit board may also contain other circuits and circuit elements such as trim capacitors, inductors, low noise amplifier circuits and power amplifiers that are part of the filter's function. Input and output coupling structures and connectors may also be provided on the circuit board. The circuit board may contain inter-stage coupling circuits, signal traces, and coupling pads/structures. Further embodiments are provided that incorporate test connectors and directional couplers on the circuit board. In yet other embodiments the filter's electrical characteristics are tunable with trim elements mounted on the circuit board, such as capacitors or inductors, in either mechanical or electrical manner. The filter's electrical characteristics may also be tunable with mechanical elements mounted through the circuit board.