Abstract: A network node includes a first port and a second port, the second port being operable to carry a first type of data traffic over a main physical interface, the first type of data traffic including Layer 2 services. The second port is operable to simultaneously carry a second type of data traffic over a sub-interface of the main physical interface. The second type of data traffic consisting of Layer 3 services that include point-to-point (P2P), point-to-multipoint (P2MP), and multipoint services.

Abstract: This is an apparatus for sharpening and otherwise enhancing images such as those produced on a screen or on the face plate of a cathode-ray tube. Regarding an image as being composed of a very large number of elements called "pixels," the apparatus of this invention enhances those of the pixels which appear at points of rapid transition between light and shade in the image. The apparatus comprises a plurality of substrates superimposed upon one another, optically in series. A first such substrate includes an array of filters and lenses which together form a "mask" that operates upon selected portions of the light input thereto to multiply certain portions of the light input with respect to certain other portions of the light input. The light upon which this operation has taken place proceeds to a second substrate where it is detected to generate electrical signals expressive of the intensities of the respective portions of the light input.

Abstract: A device for repeatably and accurately testing an antenna coupler of the type used to connect a test antenna adjacent an onboard antenna of an aircraft to inject a test signal into the aircraft's onboard radar system to test its continuity. A base member is provided with the verification antenna mounted therein. Alignment tabs are provided on the base member for receiving points along the periphery of the antenna coupler. In a preferred embodiment, the base member is mounted inside the lid of a packing case for carrying a plurality of antenna couplers and individual alignment tabs are provided and provided with indicia for properly aligning each of the antenna couplers over the verification antenna. In another embodiment, retractable shielding is provided for electromagnetic shielding of the base member, verification antenna, and antenna coupler during operation.

Abstract: A test system for microwave circuits such as employed in aircraft wherein a plurality of antennas are connected to a single processor whereby the continuity of the antennas and connectors between the antennas and the processor can be determined. A test signal is applied to the various antennae of the aircraft and the return signals therefrom received by a test antenna disposed in conjunction with a low-loss coupler from outside of the aircraft. An automated test circuit provides for inputting an identifier of the antenna and circuit portion being tested, and for determining the fault location within the circuit as a function of the circuit portion under test and the distance to the fault; and for displaying the fault location within the circuit. In one embodiment, the low-loss coupler includes the use of a plurality of test antennas in combination with a divider circuit connected to the test antennas by transmission lines.

Abstract: The method of repeatably making an antenna coupler for holding a test antenna in a repeatable fixed position on the exterior surface of an aircraft or the like relative to a working antenna disposed within the aircraft. A positive mold is made of the area adjacent the antenna within the aircraft. A temporary RF shielding box is placed over the positive mold and the mold is modified to support the box repeatably in a fixed position. Pins are provided to interact with mounting holes for an antenna. A permanent box to be used as part of the coupler is mounted on the positive mold. A ribbon gasket comprising a plurality of tubular, compressible members of an RF shielding material and having mounting tabs along the length thereof is disposed against the surface of the mold about the peripheral edge. The gasket and the box are interconnected by an epoxy material, including RF shielding means. The coupler is removed from the mold and the antenna is mounted to the mounting holes.