HP 10BASE-T Guide de l'utilisateur Page 16

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Switching Hub Features
How the Hub Works
Switching Hub Features
Link Beat
Type 10Base-T devices use a signal called link beat (also called link test pulse).
This signal informs the hub of the presence of a device connected to it over
twisted-pair cable and of the integrity of the twisted-pair link between them.
The hub will not transmit packets out of twisted-pair ports that do not sense
the link beat signal. Link beat is reflected in the port LEDs; the LED will be on:
Link beat status shown in Port LEDs
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