摘要:
A synchronous optical network (SONET) framer includes a frame dimension unit and a programming interface. The frame dimension unit can be programmed with a frame dimension through the programming interface. The SONET framer converts a data stream to and/or from a frame format based on the frame dimension programmed into the frame dimension unit. For instance, in various embodiments, a SONET framer can be programmed to support a variety of SONET frame sizes and to provide a number of testing and design advantages.
摘要:
Methods and apparatus provide single or multi-port, flexible, cost-effective, built-in self-test capabilities for network communications equipment, such as for example switches, and programmably generate, and subsequently analyze, one or more sequences of test packets, wherein the test packets simulate at least two flows of traffic. Such test packets can have programmable headers, payloads, and duty cycle. A line card embodying the present invention may generate its own traffic pattern, which may be similar or identical, to traffic patterns observed on Internet backbones. These traffic patterns may contain a bimodal distribution of control packets interspersed with data packets wherein the control packets and data packets are relatively short and long respectively. A plurality of test packet generators/receivers can be deployed in a network communications device having a plurality of ports. In such a configuration, test generator/receiver is associated with each of the plurality of ports. Under software control, test packets can be sent from at least any one of the plurality of ports to at least any other one of the plurality of ports. In this way, an in-circuit testing procedure may be implemented without having to disconnect line cards from the switch and connect the switch to expensive external test equipment.
摘要:
Methods and apparatus provide single or multi-port, flexible, cost-effective, built-in self-test capabilities for network communications equipment, such as for example switches, and programmably generate, and subsequently analyze, one or more sequences of test packets, wherein the test packets simulate at least two flows of traffic. Such test packets can have programmable headers, payloads, and duty cycle. A line card embodying the present invention may generate its own traffic pattern, which may be similar or identical, to traffic patterns observed on Internet backbones. These traffic patterns may contain a bimodal distribution of control packets interspersed with data packets wherein the control packets and data packets are relatively short and long respectively. A plurality of test packet generators/receivers can be deployed in a network communications device having a plurality of ports. In such a configuration, test generator/receiver is associated with each of the plurality of ports. Under software control, test packets can be sent from at least any one of the plurality of ports to at least any other one of the plurality of ports. In this way, an in-circuit testing procedure may be implemented without having to disconnect line cards from the switch and connect the switch to expensive external test equipment.
摘要:
A seal (8) which is produced from an elastomer and comprises a contact plate (9) which rests against the outside of the housing and forms a sealing surface (10) surrounding an outlet orifice (12) is inserted into an orifice (7) at the lower end of a housing (2) of an ink cartridge (1). A ring (11) adjacent to the top of the contact plate (9) surrounds a passage connecting to the outlet orifice (12) and leading into the interior of the housing and carries an all-round collar (13) projecting over the edge of the orifice (7) on the inside of the housing, so that the seal (8) is snapped into the orifice (7). Once the ink cartridge (1) has been inserted into a receptacle (24) of an adapter (22), with which it forms an inkjet printing head, the sealing surface (10) presses against a frame which surrounds a receiving orifice (27) of the adapter (22), which receiving orifice is connected to a nozzle plate, so that the ink path is reliably sealed. The ink cartridge (1) can be conveniently inserted by a linear movement.
摘要:
An analyte fluid stream with first molecules having relatively low molecular weight and a corresponding high coefficient of diffusion has reduced diffusional defocusing out of an analyte fluid stream. The analyte fluid stream of first molecules is associated with second molecules of relatively high molecular weight having a relatively low coefficient of diffusion and a binding constant effective to associate with the first molecules. A focused analyte fluid stream is maintained since the combined molecular weight of the associated first and second molecules is effective to minimize diffusion of the first molecules out of the analyte fluid stream.
摘要:
Circuits are described that permit the efficient supply of power from a backplane such as that contained in a motherboard. In one embodiment, the power supply stores charge at a relatively high potential to permit a last transmission from a daughterboard when power is interrupted to the motherboard.
摘要:
A device is provided for use in covering a danger area on a roll changer that can carry at least one roll of material to be directed to a rotary, web-fed printing press. A cover is provided with a drive that can move the cover. A control unit is provided to control the drive for the cover. The cover is closed in a first operational state and is open in a second operational state. The roll of material, that is supported by the roll changer, has a first rotational speed or web speed when the cover is in the first, closed operational state. In the second, cover opened, operational state, the roll of material also has a second rotational or web speed which is greater than zero. A method for controlling a device on a roll changer is also disclosed.
摘要:
A hydraulic door opening mechanism for overhead bi-fold doors is herein disclosed. The door opening mechanism mounts a hydraulic pump, pressure reservoir, valve manifold, and a hydraulic motor or cylinder on a first door panel. The door opening mechanism is pre-assembled with the doorframe prior to mounting the door in the door opening.
摘要:
A circuit is described for balancing a power supply having a positive bus with a positive voltage, and a negative bus with a negative voltage. The circuit includes a transformer having a primary winding and a secondary winding. Switching circuitry alternately connects the positive bus and the negative bus to the primary winding of the transformer thereby generating a secondary voltage of opposite polarity on the secondary winding of the transformer. Recycling circuitry is also included which is coupled to the secondary winding of the transformer and the positive and negative buses. When the secondary voltage is greater than the positive voltage, power is transferred from the negative bus to the positive bus via the transformer and the recycling circuit. When the secondary voltage is less than the negative voltage, power is transferred from the positive bus to the negative bus via the transformer and the recycling circuit.
摘要:
In a tailgate assembly, a locking mechanism for preventing rotation of the assembly in response to a torque generated by a moment arm of the tailgate assembly and a force resulting from the jolting of the truck as it travels over rough terrain.