HP 10BASE-T Guida Utente Pagina 42

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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.
Hub Reference
Hub Reference
3-6
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