Abstract: A router has N1 local signal input terminals for connection to respective local signal sources for supplying respective local input signals, a local output interface including M1 local signal output terminals, and an input expansion terminal. A signal received at any one of the N1 local signal input terminals can be routed selectively to any one or more of the M1 local signal output terminals and a signal received at the input expansion terminal can be routed selectively to any one or more of the M1 local signal output terminals. An input signal received at a local signal input terminal is delayed relative to an input signal received at the input expansion terminal by a selectively adjustable amount to achieve a predetermined time relationship between the input signals at the local output interface.

Abstract: A guide insert is provided for engagement with an edge connector receptacle including a housing having an insertion face and defining a slot for receiving a card edge inserted into the slot along an insertion axis. The guide insert has a body portion that fits over the insertion face of the housing and is formed with first and second aligned slot-form apertures for providing access to first and second segments respectively of the slot defined by the housing. A tab projects from the body portion of the guide insert between the first and second apertures for entering the slot when the body portion engages the insertion face of the housing. The tab has two opposite faces presented towards two opposite sides respectively of the slot.

Abstract: First and second successions of data words, each data word including multiple payload data bits, a data block bit (C) and a block character (SOB) having a first state to indicate start of a sequence of data block bits and otherwise having a second state, are processed by detecting as a first event occurrence of the block character of the first succession of data words in the first state and as a second event the next succeeding occurrence of the block character of the second succession of data words in the first state, wherein the second event is delayed by a time Tz relative to the first event, reading the data block bits from successive data words of the first succession and generating a succession of delayed data block bits of the first succession of data words, delayed by the time Tz relative to the payload data bits of the first succession of data words.

Abstract: Audio data of at least two audio data groups is embedded in an ancillary data space of a serial digital video data stream by multiplexing the audio data groups to provide a serial multi-group audio data stream, and inserting the serial multi-group audio data stream into the ancillary data space of the serial digital video data stream.

Abstract: A routing switch includes a first router module having N1 signal input terminals, M1 signal output terminals, an expansion input terminal and an expansion output terminal and including a core for routing a signal received at any one of the N1 signal input terminals selectively to any one or more of the output terminals and for routing a signal received at the expansion input terminal selectively to any one or more of the N1 signal output terminals. The router further includes a second router module having N2 signal input terminals, M2 signal output terminals, an expansion input terminal and an expansion output terminal and including a core for routing a signal received at any one of the N2 signal input terminals selectively to any one or more of the output terminals and for routing a signal received at the expansion input terminal selectively to any one or more of the M2 signal output terminals.

Abstract: A router that utilizes one additional crosspoint module to provide backup to N crosspoint modules. The redundant crosspoint module receives every input from P input modules and provides O/N outputs to M output modules. Each of the M output modules receives an output from a particular N crosspoint module and a corresponding O/M output from the redundant crosspoint module. Each output module has logic to determine whether the output module should select the output from a particular N crosspoint module or the output of the redundant crosspoint module.

Abstract: Electronic equipment includes a frame having a wall and connectors attached to the wall of the frame. A main board has a connection edge at which it is provided with connectors for engaging the connectors that are attached to the wall of the frame when the main board is advanced relative to the frame along a connection axis. An edge connector receptacle is attached to the wall of the frame and defines a slot perpendicular to the connection axis and to the connection edge of the main board. An auxiliary board is attached to the main board and is oriented perpendicular to the main board and parallel to the connection axis. The auxiliary board has a connection edge perpendicular to the connection edge of the main board and positioned to enter the slot of the edge connector receptacle concurrently with engagement of the connectors at the connection edge of the main board with the connectors attached to the wall of the frame.

Abstract: Electronic equipment includes a frame having a wall and connectors attached to the wall of the frame. A main board has a connection edge at which it is provided with connectors for engaging the connectors that are attached to the wall of the frame when the main board is advanced relative to the frame along a connection axis. An edge connector receptacle is attached to the wall of the frame and defines a slot perpendicular to the connection axis and to the connection edge of the main board. An auxiliary board is attached to the main board and is oriented perpendicular to the main board and parallel to the connection axis. The auxiliary board has a connection edge perpendicular to the connection edge of the main board and positioned to enter the slot of the edge connector receptacle concurrently with engagement of the connectors at the connection edge of the main board with the connectors attached to the wall of the frame.

Abstract: An optoelectric converter for generating a binary electrical data signal from a binary optical data signal includes a semiconductor photodetector for receiving the optical data signal and generating an electrical current signal. An amplifier receives the current signal generated by the semiconductor photodetector and providing a voltage output signal. An equalizer receives the voltage signal generated by the amplifier and generates an equalizer output voltage signal. A DC restorer receives the equalizer output voltage signal and generates a DC restored voltage signal.

Abstract: A router that utilizes one additional crosspoint module to provide backup to N crosspoint modules. The redundant crosspoint module receives every input from P input modules and provides O/N outputs to M output modules. Each of the M output modules receives an output from a particular N crosspoint module and a corresponding O/M output from the redundant crosspoint module. Each output module has logic to determine whether the output module should select the output from a particular N crosspoint module or the output of the redundant crosspoint module.

Abstract: In a video broadcast or production plant including first and second video sources which provide first and second digital video signals respectively at integer related frame rates, the video sources are operated so that the first and second video signals are aligned at a reference time. Switch points for updating a router in the plant are defined by measuring lapse of time from the reference time.

Abstract: A guide insert is provided for engagement with an edge connector receptacle including a housing having an insertion face and defining a slot for receiving a card edge inserted into the slot along an insertion axis. The guide insert has a body portion that fits over the insertion face of the housing and is formed with first and second aligned slot-form apertures for providing access to first and second segments respectively of the slot defined by the housing. A tab projects from the body portion of the guide insert between the first and second apertures for entering the slot when the body portion engages the insertion face of the housing. The tab has two opposite faces presented towards two opposite sides respectively of the slot.

Abstract: A coaxial connector assembly for mounting in an aperture in a stiff plate includes a barrel having a shoulder at its rear end for engaging an interior surface of the mounting plate and an external screw thread intermediate the front and rear ends of the barrel. A nut is fitted on the barrel from the forward end thereof and has an end face with a key formation for engagement by a driving tool.

Abstract: A multi-stage signal router includes a clocked storage element connected to each output of each stage of the router. Each clocked storage element is responsive to a trigger event of a clock signal to capture a signal level present at the output to which it is connected and hold the signal level at its own output until a subsequent trigger event of the clock signal.

Abstract: A coaxial connector assembly for mounting in an aperture in a stiff plate includes a barrel having a shoulder at its rear end for engaging an interior surface of the mounting plate and an external screw thread intermediate the front and rear ends of the barrel. A nut is fitted on the barrel from the forward end thereof and has an end face with a key formation for engagement by a driving tool.

Abstract: An electrical signal is equalized at the receiving end of a transmission path by applying the signal both to a frequency-dependent emphasizer and to a first port of a mixer and applying the output signal of the frequency-dependent emphasizer to a second port of the mixer. The mixer combines the signals received at its first and second ports in accordance with the amplitude of a mixer control signal to generate a mixer output signal. A control signal is generated from the mixer output signal. The control signal has an amplitude dependent on the absolute value of the derivative of the amplitude of the output signal of the mixer during an interval that starts after the beginning of a bit cell and ends before the end of the bit cell. The control signal is applied to the mixer as the mixer control signal.

Abstract: In a video broadcast or production plant including first and second video sources which provide first and second digital video signals respectively at integer related frame rates, the video sources are operated so that the first and second video signals are aligned at a reference time. Switch points for updating a router in the plant are defined by measuring lapse of time from the reference time.

Abstract: A mother board is mounted in an electrical equipment frame and has the receptacle of a first connector attached thereto at one face. The plug of the first connector is attached to a daughter board at an interconnect edge so that the first connector can be engaged by movement of the daughter board toward the mother board along an axis perpendicular to the interconnect edge of the daughter board and to the face of the mother board. A mezzanine assembly is attached to the daughter board and includes a mezzanine board in spaced parallel relationship with the daughter board and having an edge which is substantially parallel to the interconnect edge of the daughter board and at which the receptacle of a second connector is attached to the mezzanine board. An interconnect board is mounted in the frame and has an edge at which the plug of the second connector is attached to the interconnect board.

Abstract: An automatic power control circuit for a laser driver which is responsive to a data signal for driving a laser diode includes a low pass filter connected to receive the data signal and generate an output signal dependent on the DC content of the data signal. A circuit responsive to both an externally provided average power control signal and the output signal of the low pass filter controls supply of operating current to the laser diode.

Abstract: An interconnection arrangement includes an input card, a signal distribution board having first and second opposite main faces, and an input connector having first and second releasably engageable parts with the first part of the input connector attached to the signal distribution board at the first main face thereof and the second part of the input connector attached to the input card. A bus driver circuit is mounted on the input card and has a signal input terminal for receiving an input signal to be distributed. The bus driver circuit includes first and second bus drivers. The first and second bus drivers each have an input connected to the signal input terminal of the bus driver circuit and they have separate respective outputs connected to first and second pins respectively of the second part of the input connector.