A method for testing a communication network includes transmitting at least one unidirectional flow over a path through the network, and measuring arrival characteristics of the least one unidirectional flow at a receiving end of the path. The arrival characteristics include at least one of a packet throughput characteristic, a packet delay characteristic, a packet loss characteristic, a packet jitter characteristic and a packet misordering characteristic. A bidirectional flow is transmitted ove...

A dual air-oil separator which separates two air-oil mixtures of differing proportions in a single unit having first and second chambers for the separate mixtures. The two chambers are separated by a perforated partition wall. The air-oil mixture, high in air is separated as it passes from the first chamber through the perforated wall and into the second chamber. The second chamber directly receives the air-oil mixture, low in air, for separation and combination in its sump with the oil from the...

A duplex filter system having two filterized fluid flow circuits for maintaining continuous fluid flow to an engine or similar liquid utilizing device during a filter change operation. A fluid control system is provided including liquid-obstructing air vent means for selectively venting air under pressure from an empty one of said two circuits while retaining fluid under pressure within the other said circuit during charging of said empty circuit, whereby fluid pressure within the system is regu...

The present disclosure describes semiconductor devices and circuits for sending and receiving data at high speed between computer modules with excellent noise immunity and low drive power. The semiconductor circuits are arranged to send data single-ended and to receive data differentially. As is required for full duplex operation over a pair of wires, the circuit arrangements are such that a driver in a given driver/receiver module does not influence the incoming data.

A duplex copying machine is provided wherein an original document, having images on both sides, is located between a transparent rotatable drum and conveyor belts and is automatically transported thereby to a first image station to expose to a photoconductor, by lamps external to the drum, the side of the document engaged by the conveyor belts. Thereafter, the document is automatically transported to a second image station to expose to the photoconductor, by lamps surrounded by the drum, the sid...

In a document handler in which simplex or duplex document sheets are fed from a document tray overlying the copier platen of a copier to one side of the platen, with a single inversion and a document side edge registration and deskewing system in the simplex path; a unidirectional, continous loop, but non-circular duplex document inversion path integral with and partially in common with the simplex path is provided at the same side of the platen. This duplex path has first and second inverting p...

A copying apparatus capable of providing an image on both sides of a transfer material. The apparatus includes a pair of cassettes commonly usable as a feeding tray and a discharging tray, and a mechanism for detaching said cassettes. A transfer material fed from a cassette loaded in a feeding station has an image transferred thereto and fixed while passing through a required processing route, and said material is reversed onto an intermediary plate in a cassette loaded in the discharging tray s...

A duplex stock feeder for punch presses having a pair of opposed edge-gripping unitary feed units that are relatively laterally adjustable. The fluid motors for actuating the stock advancing feed slides are controlled by one valving means while the fluid motors for actuating the stock gripping means on said slides are controlled by a separate valving means. These two valving means are operated by an independent power means whose effective actuating speed is governed by the reciprocating movement...

An example of the duplex control circuit is a circuit formed of two logic flip-flops connected between two channels of a half-duplex telegraph circuit. This duplex control circuit functions to prevent reflections or feedback of the transmissions into the inactive channel. Each channel is controlled by one of the flip-flops whereby the flip-flop controlling the inactive channel is set and locks this channel to a marking condition whenever a spacing signal is processed by the active channel and do...

A duplex filtering device having an inlet port and an outlet port provided with a pair of chambers separated by a common partition, each chamber having a filter element with an inlet and an outlet passageway respectively adapted to be connected to the inlet and the outlet ports of the filtering device. A valve member is disposed at each end of the partition, one of the valve members being adapted to be rotatably shifted from a first position for connecting one of the inlet passageways to the inl...