Doubt on formula

Question

in csma/cd
which formula is right

1 .transmission delay >= 2 * propagation delay
2.transmission delay <= 2 * propagation delay

Comments

always .transmission delay >= 2 * propagation delay

because sender has capacity of  collision detection until sender do not transmit all data.

Assume

At time t=1:00 pm, a frame is sent on the idle medium by A.

At time t=1:59 pm, NIC B also transmits.(In this case, the medium, as observed by the B happens to be idle too).

At t=2:00 pm, collision detection.

At t=3:00 pm, A detect collision

After one complete round trip propagation time (twice the one way propagation delay), both station are aware of the collision. B will shortly cease transmission of the Jam Sequence, however A will continue to transmit a complete Jam Sequence. Finally the cable becomes idle.

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is this a formula for min transaction time?

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In worst case

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min transmission delay

Answer 1

option 1