When using MicroScanner Pro connected to hub sometimes the unit shows 10/100 to hub signal and other times it shows 10/100 to PC signal | Fluke Networks

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When using MicroScanner Pro connected to hub sometimes the unit shows 10/100 to hub signal and other times it shows 10/100 to PC signal

This is caused by "dueling auto-sense" circuits.
 
Whether the link partner is determined to be MDI (a PC, or "normal" connection), or an MDI-X (a hub/switch, or "uplink" connection) is traditionally determined by whether the TX signal is sensed on pair 1,2 or pair 3,6.
 
Many modern hubs and switches are capable of auto-sensing the attached link partner's signal, and will accommodate either by internally switching which pair is used by the hub/switch. The sensing is usually accomplished by the simple expedient of alternately offering the TX signal on each of the two pair choices.

Author: Adrian Young

Creation Date: 2014-02-25

Last Modified: 2014-02-25

 
 
 
 
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