摘要:
Computers store data items, each data item being assigned to one of a plurality of virtual directories. Each computer has at least one node of a virtual network for directory look-up, with linking data including addresses of other nodes associated with the same virtual directory and software that, in response to an enquiry message either replies, identifying itself or forwards the message to another node of the network, according to whether the node is or is not associated with the directory specified in the enquiry message.
摘要:
Packet forwarding apparatus has an input for receiving packets; a packet classifier arranged in operation to read a class indication in received packets and in dependence thereon to pass packets to a class-based policer associated with the class indicated; a plurality of class-based policers, each operable to assign a provisional indication to packets of the associated class in response to a measure of the load presented by packets of the class exceeding a predetermined class-based threshold; a multi-class policer operable to receive provisionally-indicated packets processed by the class-based policers, and to assign a congestion indication to packets having the provisional indication in response to congestion arising at the packet forwarding apparatus; and an output for presenting packets processed by the multi-class policer for onward transmission from the apparatus.
摘要:
A system for distributed process management uses a plurality of units of software installed on a computing platform. Further software controls operation of the plurality of units in use. Each unit of software communicates with other units of software, and at least some of the units of software further provides one or more elements of a software process. The further software being capable of defining at least one set of software units and controlling communication by the units in the set to be limited to communication only with other units of the set
摘要:
A communication system (1) in which a user (A) can elect to leave a message directly in the mailbox (11a) of another user (B) without calling or disturbing user (B). A store (database 7) is generated and maintained which identifies those users who are allowed direct access to the mailbox of user (B). The store is automatically updated whenever user (B) sends a communication to other users.
摘要:
Structured information data sets structured according to a first predefined structure are converted into data sets structured according to a second predefined structure by way of an intermediate data structure. Conversion rules are defined to convert from each of the first and second predefined structures into the intermediate data structure and from the intermediate data structure into each of the first and second predefined structures. A pre-processor is provided to carry out initial processing tasks on a received data set to make it more susceptible to structural processing according to the conversion rules, and a post-processor is provided to carry out tasks such as vocabulary and data type conversion.
摘要:
The rate of data transmission to a user via a communications link of a network is controlled wherein resource requests are communicated to a service provider. The resource requests are determined in accordance with an indication of the congestion level on the network and the user's defined parameters, such as their willingness to pay for the resource, wherein the resource request is weighted by a variable parameter, whose value is set in accordance with the congestion level on the network. This allows the rate controller to react efficiently and swiftly to network conditions as well as user defined parameters. By providing a computer programmed to act as a purchasing agent an automatic resource request to a service provider is enabled. An embodiment is described in which audio or video data is streamed to a user on the basis of the resource requests made on the user's behalf and is adjusted on the basis of user and network defined parameters. Such techniques could also be used to provide appropriate data streaming for many different types of network traffic.
摘要:
Messages are generated by a first device which messages together have the purpose of identifying a predetermined number of devices which satisfy a test condition included in each message. These messages are sent respectively to on-line devices neighboring the first device. To ensure that no more devices than necessary are identified by the messages, each message includes a variable which is referred to as a token bucket which indicates the number of devices to be discovered by the message. Additionally, each message includes a unique identifier. When one device receives a discovery message sent from another device, it determines if it satisfies the test condition and if so it sends an acceptance message to the originating device, decrements the token bucket in the message and forwards on any remaining tokens to another neighbor. The process stops once all tokens have been disposed of in this way. If a message reaches the end of a path without disposing of all of the tokens, the message is returned back up the path to try different paths until eventually all paths have been tried or a restriction criterion e.g., maximum permitted number of hops) is met whereupon the message is returned back as a failed message to the originating device.
摘要:
A number of data collection devices are free to move relative to each other through their environment, collecting data from their environment. They form an ad hoc wireless network in which data collected by a device either by its own sensors, or relayed from another device is transmitted to a destination either directly or by means of one or more other devices. The destination collects data collected by the mobile terminals for subsequent processing. The wireless links between them have to be re-arranged in order to provide the optimum network. When two devices come into proximity to each other, a forwarding direction is determined to identify to which device data should be forwarded. The devices co-operate to define their forwarding directions by exchanging data relating to their physical locations, and factors such as the spare capacity of their buffer stores, and battery condition. Thus a network will be defined dynamically, each device having its forwarding direction aimed in the direction of the next device until they reach a sink.
摘要:
An installation for terminates a network cable of a public communication network at customer premises. The network cable is terminted and a connector allows a connection to be made between the public communication network and the customer premises via the termination. The termination is enclosed within an external wall of the customer premises. A first closeable access aperture is provided to permit access to the termination from outside the customer premises, and a second closeable access aperture is provided to permit access to the termination from within the customer premises.
摘要:
A device for testing a data carrying service operating over a telecommunications line includes a plurality of test circuits. Each test circuit is arranged to determine and test one or more characteristics of a data carrying service and a termination of the telecommunications line is emulated. The operation of each of the plurality of test circuits is controlled, and the telecommunications lines is connected to one or more of the plurality of test circuits. The data carrying service remains connected via a connection during all of the testing operations provided by one or more of the test circuits which enables the device to automatically determine the identity of the data carrying service. The test circuits may be arranged to enable emulation of a termination to be interconnected so as to enable the device to provide a passive link in the data carrying service and/or provide throughput testing of the telecommunications line.