| 摘要 |
A first device ( 102 ), associated with an electrical substation, for example, automatically transmits a plurality of echo requests to a second device ( 104 ) that is in communication therewith by way of a communications channel ( 106 ). The second device ( 104 ) responds to the echo requests, and the first device ( 102 ) determines parameters relating to the echo requests, such as round trip times. The first device ( 102 ) calculates a channel quality metric as a function of the determined parameters.
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