发明名称 |
Instrument and method for testing local area network cables |
摘要 |
An instrument and method for the troubleshooting and verification of copper-wire local area network (LAN) cable systems provides a series of resistance and capacitance measurements between all possible wire pairs using a pair of switch matrices and a software method for evaluating the measurements which are stored in a two-dimensional matrix. The stored measurements are evaluated against predetermined figures of merit and the decision pattern in matrix form is compared to that of a known good LAN cable system. Error messages responsive to mismatches are generated and presented to the operator via a user interface. Near-end cross talk (NEXT) isolation is evaluated using a mathematically calculated differential capacitance technique. Error messages are generated responsive to difference capacitance values larger than a figure of merit correlated to an acceptable level of NEXT isolation.
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申请公布号 |
US5559427(A) |
申请公布日期 |
1996.09.24 |
申请号 |
US19940222156 |
申请日期 |
1994.04.04 |
申请人 |
FLUKE CORPORATION |
发明人 |
HINDS, MARK E.;LEWANDOWSKI, ROBERT J.;LOCKE, THOMAS P.;SHEFFER, TZAFRIR |
分类号 |
G01R27/04;G01R31/02;H04L12/26;(IPC1-7):G01R31/02 |
主分类号 |
G01R27/04 |
代理机构 |
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