Device, method and system for estimating the termination to a wired transmission-line based on determination of characteristic impedance
First Claim
1. A method for estimating the number of wire pairs connected to a single connection point, where each wire pair has a similar nominal characteristic impedance Z0, the method comprising:
- connecting a characteristic impedance measuring device to the single connection point;
measuring, at the connection point, the lumped impedance Z presented by the wire pairs adjacent the connection point;
calculating Z0/Z to provide an estimate of the number of wire pairs connected to the single connection point; and
providing an output indicating the estimate of the number of wire pairs connected to the single connection point.
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Accused Products
Abstract
A system and method for measuring a characteristic impedance of a transmission-line comprises transmitting energy to the line, and shortly after measuring the voltage/current involved and thus measuring the equivalent impedance. The measured characteristic impedance may then be used in order to determine the termination value required to minimize reflections. In another embodiment, the proper termination is set or measured by adjusting the termination value to achieve maximum power dissipation in the terminating device. The equivalent characteristic impedance measurement may be used to count the number of metallic conductors connected to a single connection point. This abstract is not intended to limit or construe the scope of the claims.
88 Citations
26 Claims
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1. A method for estimating the number of wire pairs connected to a single connection point, where each wire pair has a similar nominal characteristic impedance Z0, the method comprising:
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connecting a characteristic impedance measuring device to the single connection point; measuring, at the connection point, the lumped impedance Z presented by the wire pairs adjacent the connection point; calculating Z0/Z to provide an estimate of the number of wire pairs connected to the single connection point; and providing an output indicating the estimate of the number of wire pairs connected to the single connection point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A device for estimating the number of wire pairs connected to a single connection point, each wire pair has a similar nominal characteristic impedance Z0 and the wire pairs are all connected to the single connection point, said device comprising:
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a port for connecting to the connection point, a lumped impedance measuring unit coupled to said port for instantaneously measuring the connection point lumped impedance Z, a Z0/Z calculator coupled to the lump impedance measuring unit for estimating the connected wire pairs count to be Z0/Z; and an output for indicating the estimate of the number of wire pairs connected to the single connection point. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification