Abstract:
A system and method for determining an operational characteristic of a business process associated with a network. A network environment (10) includes network devices (12, 12A), network device (16), management station (18), and network (20). Network device (12, 12A), network device (16), and management station (18) communicate with each other across network (20).
Abstract:
A method of processing data received at a local system in response to polling a remote device, wherein the local system includes a local clock, the method involving: sending a first poll to the remote device (100); receiving a response from the remote device to the first poll (102), the response to the first poll containing data and a time stamp indicating when the remote device responded to the first poll (102); for the data received in response to the first poll, computing a first time by using both a time that was derived from the local clock for a previous poll of the remote device and also the time stamp contained in the response to the first poll (110); comparing the computed first time to information that the local system stored in connection with the first poll, was derived from the local clock (114).
Abstract:
A method of merging a list of newly found network elements and a list of previously known network elements includes arranging the newly found network elements in a hierarchical structure, and determining one or more device matches between each network device in the list of newly found network elements and one or more network devices in the list of previously known network elements (102). The method further includes, for each of the one or more device matches, determining one or more network element matches between the newly found network element and the corresponding previously stored network device (104). The method also includes updating the previously found network device corresponding to each of the one or more device matches with the corresponding newly found network device.
Abstract:
Apparatus and methods for automatically processing and displaying information for managing equipment or services in a network. The information is automatically inserted into a hierarchical data structure, which can then presented in a ticker display for viewing by a user. The information concerning the network equipment or services may also be used to determine the users affected by particular network failures.
Abstract:
A failed device is identified in a network that includes plural devices. To begin, an attempt is made at communication with a target device [202]. If the attempt at communication with the target device fails [205], it is determined if the target device has an active neighbor [206]. If the target device has an active neighbor, the target device is identified as a failed device [207].
Abstract:
A local area network modem which meets the stringent signalling requirements of the IEEE 802.4 standard. The modem supports loopback commands by insuring that the receiver and transmitter portions are in phase-synchronism, regardless of the distance between the modem and upper layer control circuitry. An automatic gain control circuit is included which eliminates a number of problems associated with prior designs. The modem's receiver monitors itself to automatically correct drift in phase and automatic gain control adjustment, without intervention from the upper layer. Control (AGC) circuits are particularly susceptible to noise corruption while the receiver is being synchronized. The transmitter uses only two digital signal wires to specify which of a number of functions are to be performed by the transmitter analog components.
Abstract:
A symbol detection and correction scheme for local area network modems, especially those which receive one of three symbols at any given time, such as those operating in accordance with the IEEE 802.4 standard. The invention significantly improves the bit error rate observed by the layer above the modem. The modem operates on a received signal with a pair of slicers. One slicer operating as a two-symbol decoder, and a second slicer operates as a three-symbol decoder. A receiver state machine is used to keep track of which portion of a frame is currently expected to be received. Depending upon the particular context, one or both of the slicer outputs are used by the state machine to determine which of the three symbols was received. For example, when the receiver is in a state where only one of two data symbols are expected, and no control symbols are expected, only the two-symbol slicer output is used. The three-symbol slicer output, and logical combinations of the three-symbol slicer output and the two-symbol slicer output, are used at other times. The receiver state machine recognizes errors in pseudo-silence, start delimiter, and end-delimiter sequences without reporting such errors to the upper level, thereby greatly decreasing the error rate observed there.
Abstract:
A method of processing data received at a local system in response to polling a remote device, wherein the local system includes a local clock, the method involving: sending a first poll to the remote device; receiving a response from the remote device to the first poll, the response to the first poll containing data and a time stamp indicating when the remote device responded to the first poll; for the data received in response top the first poll, computing a first time by using both a time that was derived from the local clock for a previous poll of the remote device and also the time stamp contained in the response to the first poll; comparing the computed first time to information that the local system stored in connection with the first poll, wherein the information that the local system stored in connection with the first poll was derived from the local clock; and determining how to process the data received in response to the first poll based on comparing the computed first time to the information that the local system stored in connection with the first poll.
Abstract:
The invention features a method and apparatus for displaying the status of network resources, to include rendering fishbone layouts (45) in a snowflake layout. Each fishbone layout features a hierarchy with resource profiles (30) and dependency relationship among the resource profiles (77). The resource profiles represent network resources. Hierarchies in the snowflake layout (46) share a common root.
Abstract:
A failed device is identified in a network that includes plural devices. To begin, an attempt is made at communication with a target device [202]. If the attempt at communication with the target device fails [205], it is determined if the target device has an active neighbor [206]. If the target device has an active neighbor, the target device is identified as a failed device [207].