摘要:
According an aspect of the embodiment, there is provided a method for accommodating signal paths to a ring network. A demand chain is defined as a series of traffic demands in which each traffic demand shares one of the pair of terminal nodes pointed thereby with at least one adjacent traffic demand and the number of pairs of terminal nodes pointed by traffic demands in the series of traffic demands is maximized. Each traffic demand of the demand chain is corresponded to a demand accommodating route which is defined as a route between the pair of terminal nodes on the ring network pointed by the each traffic demand and arranged in a predetermined rotation direction on the ring network. Then, signal paths required by traffic demands each pointing a pair of terminal nodes both included in the demand accommodating route chain are accommodated to the demand accommodating route chain.
摘要:
An appropriate ring topology is selected by searching network topology information on the basis of given information about client signal paths on a predetermined condition, and a wavelength ring accommodating the client signal paths and having an optimal transmission characteristic is designed on the basis of the selected ring topology. Accordingly, accommodation of client signal paths in an optical network is efficiently designed.
摘要:
The present invention relates to an estimation system that can provide a highly reliable estimation result when the estimation system estimates person-hours required to prepare a film pattern for a circuit to be printed on a board. Upon receiving design conditions from a cline machine, a reference pin calculator of the estimation system calculates a number of reference pins on the basis of a total number of pins extending from parts to be integrated on the printed circuit board and a special specification requirement to be applied to the printed circuit. An additional pin calculator calculates a number of additional pins on the basis of a signal line wiring method. A total estimated pin calculator corrects a sum of the reference pins and the additional pins on the basis of design difficulty, which is determined from a number of signal layers to be made in the printed circuit, a number of signal lines arrangeable between adjacent pins and a pin density, to calculate a total estimated number of pins. A person-hour calculator calculates person-hours required to prepare a pattern film of the printed circuit by dividing the total estimated number of the pins by an average number of pins handleable by a design engineer per a unit time.
摘要:
A demand accommodation design system for accommodating a demand specifying a signal transmission route from a start-point node to an end-point node within an optical network includes an analytical unit to acquire at least one optical path candidate for minimizing cost of the optical network by solving an objective function incorporating cost of optical path candidates by bandwidth, the optical path candidate being a candidate for an optical path composing a demand, and a mathematical programming problem employing a constraint condition incorporating a bandwidth of an optical path pattern candidate connecting the start-point node and the end-point node of the demand and a bandwidth of the acquired optical path candidate, the optical path pattern candidate being the acquired optical path candidate itself or being obtained by combining the optical path candidates, and an allocation unit to allocate the demand to the acquired optical path candidate to accommodate the demand.
摘要:
A resource reservation apparatus reserving a resource on a second and third route connecting a start with end node of the first route over a network having a resource on a first route, includes a resource controller for defining a fourth route including a link obtained by excluding a common link between the first and second route and between the first and third route from a link included in the first, second or third route, a message generator for generating a message used for reserving a resource of the link included in the fourth route and transmitting the message to a node on the fourth route, and a message processor for transmitting a message used for generating the second and third route from the resource on the first route and on the fourth route reserved by the message generator to a node included in the second or third route.
摘要:
A demand accommodation design system for accommodating a demand specifying a signal transmission route from a start-point node to an end-point node within an optical network includes an analytical unit to acquire at least one optical path candidate for minimizing cost of the optical network by solving an objective function incorporating cost of optical path candidates by bandwidth, the optical path candidate being a candidate for an optical path composing a demand, and a mathematical programming problem employing a constraint condition incorporating a bandwidth of an optical path pattern candidate connecting the start-point node and the end-point node of the demand and a bandwidth of the acquired optical path candidate, the optical path pattern candidate being the acquired optical path candidate itself or being obtained by combining the optical path candidates, and an allocation unit to allocate the demand to the acquired optical path candidate to accommodate the demand.
摘要:
An arbitrary node that belongs to a virtual LAN sends a request packet including a count value indicating the number of communication hops across nodes to each of its adjacent nodes that belong to the virtual LAN and are adjacent. Upon receiving the request packet, each of the adjacent nodes sends the request packet in which the count value is incremented or decremented to each of its adjacent nodes that belong to the virtual LAN and are adjacent to the node, excluding a sender of the request packet received, and sends a reply packet including the sender's address, an address of the node that is a replying node, and the count value to a given return destination. The return destination collects reply packets sent thereto and keeps track of the topology of the nodes constituting the virtual LAN from information contained in the reply packets.
摘要:
There is provided topology information including connection states among nodes in a network, and port information including restriction conditions on connectivity among ports within a restricted node. A path search apparatus finds a first path having the minimum total link-cost among a plurality of paths. The topology information is changed so that the first path is not searched for as a path having the minimum total link-cost among the plurality of paths, and the port information is changed based on a port connectivity change rule. Then, the path search apparatus finds a second path different from the first path, based on the changed port information and the changed topology information, and reconfigures a pair of link-disjoint paths satisfying the restriction conditions imposed on the restricted node, by removing a link shared by both the first and second paths from the original topology information.
摘要:
According an aspect of the embodiment, there is provided a method for accommodating signal paths to a ring network. A demand chain is defined as a series of traffic demands in which each traffic demand shares one of the pair of terminal nodes pointed thereby with at least one adjacent traffic demand and the number of pairs of terminal nodes pointed by traffic demands in the series of traffic demands is maximized. Each traffic demand of the demand chain is corresponded to a demand accommodating route which is defined as a route between the pair of terminal nodes on the ring network pointed by the each traffic demand and arranged in a predetermined rotation direction on the ring network. Then, signal paths required by traffic demands each pointing a pair of terminal nodes both included in the demand accommodating route chain are accommodated to the demand accommodating route chain.
摘要:
A voltage controlled oscillator which performs an oscillating operation at a frequency corresponding to a control voltage, includes a voltage-current converter circuit which converts the control voltage to a control current corresponding to a voltage value thereof, and a ring oscillator through which an operating current corresponding to the control current generated by the voltage-current converter circuit is caused to flow, and which oscillates at a frequency corresponding to a current value thereof. The voltage-current converter circuit has a voltage-voltage converting circuit which inputs the control voltage therein and converts the same to a control current corresponding to the voltage value thereof, and an offset current generating circuit which adds a constant current to the control current.