摘要:
A fault tolerant computer system for downloading the contents of a server system log through either a local or remote client machine without intervention of the server operating system software. The remote machine accesses the server by use of a dial-in modem connection, while the local machine accesses the server by a local serial connection. The system log may be stored in a non-volatile RAM which is powered by a remote interface if the server power is off. The downloaded information is displayed in a graphical user interface window to enable diagnosis and recovery of the server.
摘要:
A method for entering and leaving a power-saving operation of a subscriber in an annular communication network includes transmitting data in the communication network in a format that prescribes a pulsed sequence of individual bit groups of identical length in which specific bit positions are reserved for a preamble which is decoded in a receive circuit of each subscriber. During a power-saving operation of a subscriber, at least part of the subscriber which contains the receive circuit remains turned on, and at least one special preamble code is provided, upon the reception of which a part of the subscriber turned off during the power-saving operation is turned on again.
摘要:
In a method and apparatus for detecting a wake packet among data bytes in a packet frame issued by a network device, the data bytes in the packet frame are initially compared with a sync byte to detect start of a synchronization stream of the wake packet. The number of consecutive sync matches of the data bytes in the packet frame with the sync byte is counted, and a partial match flag is set upon detection that the number of consecutive sync matches has reached a predetermined number of sync duplications of the sync byte to indicate that the synchronization stream has been detected in the packet frame. When the partial match flag is set, the data bytes that follow the synchronization stream in the packet frame are compared with address bytes of a destination address assigned to a sleeping node. The number of consecutive address byte matches of the data bytes in the packet frame with the address bytes of the destination address is counted, and a packet detected signal is provided to the sleeping node upon detection that the number of consecutive address byte matches has reached a pre-programmed number of address byte matches, the pre-programmed number of address byte matches being less than a total number of address bytes of a destination address stream of the wake packet.
摘要:
A configurable remote controller for remotely sensing the status(es) of one or more electrically-powered target systems and for altering the status(es) of the target systems in response. In one embodiment, the remote control device is coupled to a preexisting communication channel established between a command system and one or more target systems. A system administrator transmits control instructions over the pre-existing communication channel to the remote controller. The remote controller receives and processes the control instructions as well as senses for a change in the status of at least one of the target systems. If a change in status is detected, then the remote controller alters the status in accordance with the control instructions. The change can be a lowering of the voltage level in which disconnecting the one target system from the power source can be considered a form of altering the status.
摘要:
Methods and apparatus for conserving power in terminal units that transmit and receive modulated data over a communications loop that is shared with voiceband telephone equipment are disclosed. The methods include monitoring the loop to detect a shut-down condition and reducing power consumption of certain of the electronic circuits in the terminal unit upon detection of a shut-down condition. The methods also include monitoring the loop with a monitoring circuit to detect a resume signal outside the voiceband frequency range on the loop and restoring power to the electronic circuits when the resume signal is detected. The apparatuses include a modulated data transmitting and receiving unit having a connector for coupling the unit to a communications loop, circuitry to transmit and receive a modulated data signal in a frequency range above voiceband, and circuitry to detect a resume signal in the frequency range above voiceband and then to initiate a power up sequence for the transmit and receive circuitry.
摘要:
Apparatus and method providing improvements in establishing a data path between local and selected remote equipment over non-dedicated telephone lines. The present invention provides for the detecting of signalling activity during period not normally monitored, to provide a system which is resistant to accidental interruptions during the initial establishment of the data path, and includes apparatus, such as an external programmable code repeater insertable between the calling computer and the telephone line to overcome limitations of typical modems and modem software. Also included are further features offering greater flexibility in applications and permitting further compatibility with differing or more limited hardware and software systems.
摘要:
A software architecture for the hot add and swap of adapters. The software architecture allows users to replace failed components, upgrade outdated components, and add new functionality, such as new network interfaces, disk interface adapters and storage, without impacting existing users. The software architecture supports the hot add and swap of off-the-shelf adapters, including those adapters that are programmable.
摘要:
A communication control unit connecting a terminal and a network temporarily disconnects a circuit of the network without ending a session, when no data is received from the network or when no data is transmitted to the network. In response to an occurrence of the transmitted data in the terminal or in response to an occurrence of a request for the connection of the circuit, the temporarily disconnected circuit is re-connected so that the session is resumed.
摘要:
A computer activation device comprised of at least one local computer system and at least one remote computer system, the computer systems are connected via a standard data communication interface by their own modems. An activator device is in electrical communication with the data communication interfaces of the local and remote computer systems, such that the activator device controls the application of operative power to the local computer system on receipt and recognition of a secure coded signal from the data communication interface of the remote computer system.
摘要:
Apparatus associated with a remote communication station responds to predetermined sequences of characters received over a communication channel by initializing or conditioning equipment located at the remote station. The predetermined sequences include a plurality of synchronization characters followed by a plurality of identification characters, the latter of which identify the nature of the initialization or conditioning to occur at the remote station. The apparatus "looks" bit by bit at received data to determine when a synchronization character is received. When such a character is detected, the apparatus "looks" at the succeeding characters on a character by character basis to ascertain whether the predetermined sequence of characters is received. For each character received, a programmable read only memory produces an output which is compared with reference signals produced by another programmable read only memory. If a mismatch occurs, the apparatus is reset to again "look" at the received data on a bit by bit basis. If matches occur for the remaining characters of the sequence, then the apparatus signals the remote station equipment to initialize or condition the equipment in accordance with the identification characters received.