Abstract: Embodiments provide systems and techniques for testing the functionality of a network architecture having multiple redundant internet protocol (IP) networks. An example system includes a first IP network having a first network device, and a second IP network having a second network device. The system also includes a computing device coupled to the first IP network via the first network device and to the second IP network via the second network device. The first network device is configured to selectively forward first packet(s) of the IP media traffic flow to the computing device when the first packet(s) satisfies a first predetermined condition. The second network device is configured to selectively forward second packet(s) of the IP media traffic flow to the computing device when the second packet(s) satisfies a second predetermined condition.

Abstract: A switch includes processing hardware and a memory storing software code. The software code is executed to begin receiving a first video stream from a first media source, begin forwarding the first video stream to a video receiver, begin receiving a second video stream from a second media source, receive a switch command to forward the second video stream to the video receiver instead of the first video stream, and detect, within a frame of the first video stream, a switch point in a video packet header of a video packet contained within that frame. The software code begins forwarding, in response to the switch command and at the switch point, the second video stream to the video receiver, and contemporaneously stops forwarding the first video stream to the video receiver, to provide seamless switching from the first video stream to the second video stream.

Abstract: A sheet-supporting stand or easel includes two or more legs, at least one of which is adjustable in length, so as to vary the angle of the stand relative to the ground. A U-shaped mast provides a carriage area for holding one or more sheets, and a pair of clamping devices, mounted to the mast, clamp the sheets from opposite sides. The legs can be collapsed and pivoted around their mounting to the mast, such that the entire assembly can be transported in a generally flat and compact configuration. A wheel may be attached to one or more of the legs, to facilitate movement of the stand along the ground. The wheel may be pivoted and held at any desired angle relative to the leg, such that the wheel may be kept away from the ground while the stand is in use.

Abstract: An artist's easel comprising a framework adapted to receive and hold a canvas; one or more wheels mounted on the framework and enabling the easel to be wheeled to and from a place of use; means for maintaining the frame in its normally intended attitude of use; and means which, in use, engage the ground on which the easel stands to resist any tendency of the easel to move along the ground, characterised by the feature that the easel, as well as being height-adjustable by moving at least a portion of the frame, can also swivel about the frame axis.

Abstract: An artist's easel comprises a framework adapted to receive and hold a canvas, and one or more wheels mounted on the framework and enabling the easel to be wheeled to and from a place of use. The easel also includes means for maintaining the frame in its normally intended attitude of use, and means which, in use, engage the ground on which the easel stands to resist any tendency of the easel to move along the ground. The easel is characterised by two features. Firstly, that the said ground engaging means comprises one or more feet which project at a fixed angle from the lower portion of the frame; and secondly, that the or each wheel is mounted on the fram via a linkage which is so constructed that a user of the easel can move the wheel (or wheels) away from the foot (or feet) to stand the easel on the ground so that the wheels and the or each foot engage the ground in spaced-apart relationship to maintain the frame in its intended attitude of use.

Abstract: An artist's easel comprises a framework adapted to receive and hold a canvas, and one or more wheels mounted on the framework and enabling the easel to be wheeled to and from a place of use. The easel also includes means for maintaining the frame in its normally intended attitude of use, and means which, in use, engage the ground on which the easel stands to resist any tendency of the easel to move along the ground.

Abstract: Apparatus for cleaving an optical fibre (115) under axial tension, is provided with a cleaver blade (116) which is mounted as part of a rotatable cleaver assembly. The assembly is balanced about its axis of rotation and, as described, comprises a wheel (117) mounted on an axle (138). The cleaver blade (116) is attached to an arm which extends radially from the wheel (117). A hair spring (304) drives the assembly. The cleaving apparatus finds particular application in cleaving monomode fibres under normal working, rather than laboratory, conditions.