摘要:
An ATM switch with multicast capability is provided that internally uses input and output identifiers to identify the cell input and output streams, the relevant input identifier being generated for each cell as it arrives. The apparatus has a store for storing both the cell bodies of the cells received by the apparatus and queue data serving to identify in first-in-first-out order, the cell bodies to be output on each output stream. The apparatus is further provided with a send-control subsystem including a scheduling loop and an injection block for injecting output identifiers into the scheduling loop in response to the arrival of new cells. The scheduling loop effects output scheduling of the output streams on the basis of the output identifiers and indicates the next scheduled output stream by outputting the corresponding output identifier, thereby removing it from the scheduling loop. An output unit receives the output identifier of the next scheduled output stream from the send-control subsystem and uses this identifier to retrieve the corresponding cell body from the store. The output unit then outputs this cell body on the scheduled output stream. The send-control subsystem can also be used in systems handling variable-length packets.
摘要:
In order to schedule the transmission onto a link of cells associated with different virtual channels, a transmission schedule is set up associating virtual channels with respective transmission time slots. Each time a cell is sent, the corresponding virtual channel is re-allocated to a time slot that is offset from the current one by an amount dependent on the desired rate of transmission. This desired rate is specified for each virtual channel in a corresponding transmission rate indicator including a fixed integer part, a fixed fractional part, and a variable accumulation part. The fixed parts of the indicator define the desired rate whilst the accumulation part is used in calculating each successive offset. More particularly, to determine the offset of the time slot next to be allocated to a virtual channel, the three parts of the corresponding transmission rate indicator are added up and the integer component of the result is used as the offset, the fractional remainder being stored back to the accumulation part of the transmission rate indicator. This arrangement permits a fine control to be achieved on the average transmission rate. A similar approach can be used to control the rate of credit generation in systems where transmit credits are used to regulate cell transmission.
摘要:
An integral biomolecule preparation device which accomplishes all of the nucleic acid separation steps, including centrifugation, reagent addition, and pipeting, automatically without human intervention to fully automate the DNA separation procedure.
摘要:
A method and system for message delivery in messaging networks is provided. The system provides a group of replicated queues for messages that are operable to be identified by an application before a message is read. The group of replicated queues are defined in association with a group of message managing systems, where a message is sent to each of the group of replicated queues to be accessible using any one of the group of message managing systems. The method includes creating a message including a unique identifier, and sending the message to each of a group of replicated queues with the message identifiable by the unique identifier information prior to the message being consumed.
摘要:
In a system comprising a first fabric and a plurality of devices coupled to the fabric by Fibre Channel connections, the devices are logically grouped to form configurations and zones. A configuration includes at least one zone, and each zone includes at least one device as a member of the zone. Communications between the devices is restricted according to the configuration currently in effect. For example, one device may be permitted to communicate with another device only if they are members of a common zone.
摘要:
The present subject matter is directed to electronic circuitry and associated hardware configured to electronically control directional signals, i.e., neutral, forward and reverse signals, to the transmission of a watercraft. The circuitry provides for electronic control of the throttle position of the watercraft engine and electronic override of the transmission shifting circuitry to allow throttling up (i.e., revving) of the engine without placing the transmission into gear. In an alternative embodiment, directional control is effected by operation of a lever mechanism and override functionality is effected by manual disengagement of a drive mechanism for the directional control while maintaining operation of the electronic throttle control.
摘要:
In a method of controlling a network of interconnected publish/subscribe message brokers for routing publications from a plurality of publishers to interested subscribers, each message broker is arranged to receive publications from publishers both directly and via other brokers and to receive subscriptions and unsubscriptions from subscribers and other brokers for publications meeting predefined criteria identified in the subscriptions or unsubscriptions. Each broker creates and manages a list correlating subscribers with the predefined criteria. It then matches received publications with the subscription list and forwards publications which match listed subscriptions which are in an active state to interested subscribers and interested other brokers in the list. Also, in response to received subscriptions and unsubscriptions, each broker generates and forwards proxy subscriptions and proxy unsubscriptions to other brokers. Each broker establishes a retention period for subscriptions. Then, in response to receipt of an unsubscription from a subscriber or a proxy unsubscription from another broker, it retains the corresponding subscription in a retained state for the retention period. During the retention period, matching publications will not be forwarded to the subscriber or other broker and no proxy unsubscriptions will be forwarded to other brokers. A new subscription for the same matching publications as the retained subscription during the retention period causes a reversion of the retained subscription to its active state. Propagation of proxy subscriptions and unsubscriptions is thus reduced in dependence on the duration of the retention period.
摘要:
In a system comprising a first fabric and a plurality of devices coupled to the fabric by Fibre Channel connections, the devices are logically grouped to form configurations and zones. A configuration includes at least one zone, and each zone includes at least one device as a member of the zone. Communications between the devices is restricted according to the configuration currently in effect. For example, one device may be permitted to communicate with another device only if they are members of a common zone.
摘要:
A computer processor and associated computer memory which has in the memory a number of existing content processing operations (CPOs) which include associated description of the type of content they can process, and which has installed, and runable on it, a content processing operation protocol software which is capable of identifying the input requirements of input pins of the CPOs, and which can enable the characteristics of outputs of the CPOs to be identified; and which processor also has installed and runable on it CPO binding software which is adapted to reserve the operation of one CPO and provide its output to another CPO, and which has the protocol necessary to promise the services of one CPO to another CPO, the CPO binding software being able to interpret and use the characteristics of the CPOs expressed in the CPO protocol to determine that it is appropriate to link the one CPO with the other CPO to produce a desired overall function.
摘要:
A digital repository 20 includes data items. A user can add additional functionality or program routines to data item by including as a data item a data processing identifier pointing to at least one data processing routine. Such routines are accessed by a client 22 by sending from a client to the digital repository 20 a request to access a data item, wherein the repository provides an interface description document 32 from the digital repository 20 to the client 22 as the response to the request. The client 22 can then transmit a data processing request from the client to a service 26 identified by the data processing identifier of the interface description document 32, the data processing request including the identifier from the interface description document.