Waiting for task.

Küldés Fogadás

Send Receive

Getting data to send from higher layer.

. . . . .

Forming the frame.. . . . .

Number of trials is zero. (N = 0)

. . . . .

Is the channel busy?

Igen Nem

. . . . .

Yes No

Waiting the gap time.

Starting transmission.During collision detection.

Ütközés történt Sikeres átvitel

. . . . .

Collision occurs No collision

Indicating successful transmission to higher layer.

. . . . .

Waiting for task.

Küldés FogadásSend Receive

Sending jam signal.. . . . .

Number of trials increased. (N = N + 1)

. . . . .

Is number of trials 16?(N = 16 ?)

Igen NemYes No

Indicationg the unsuccessful transmitting to higher layer.

. . . . .

Waiting for task.

Küldés FogadásSend Receive

N < 10 ?

Igen NemYes No

Delay time:Random between 0 – (2N-1) unit.

. . . . .

Waiting the delay time.

Is the channel busy?

Igen Nem

. . . . .

NoYes

Delay time:Random betweem 0 – (210-1) unit.

. . . . .

Waiting the delay time.

Is the channel busy?

Igen Nem

. . . . .

NoYes

Synchronization.Waiting for the start of frame.

. . . . .

Is the frame length and CRC OK?

Igen NemNoYes

Is the destination address equal to mine or is it broadcast?

Igen NemYes No

Discard the frame!. . . . .

Waiting for task.

Küldés FogadásSend Receive

Give the data field of frame to higher layer!

. . . . .

Waiting for task.

Küldés FogadásReceiveSend