Madge Networks 802.11b Uživatelský manuál stáhnout pdf (Strana 19)

Wireless LANs and CSMA

• Before transmitting, a sending station needs to

know if there is activity around the receiver

– Is CSMA/CD effective here?

• CSMA only tells if there is activity around the

sending station

– On guided (and shared) medium, only one

transmission can take place at any give time

• This is heard by all stations

– When using wireless, multiple transmissions can

occur simultaneously provided, that they all have

different destinations and these destinations are

“sufficiently” apart.

• All transmissions need not be heard by all stations

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Madge Networks 802.11b Uživatelský manuál Strana 19