Problem in Data Link Layer

[nikesh e s]

Hi,

I have doubt in the problems of Data Link Layer listed  below:

1.  Suppose nodes A and B are on the same 10 Mbps broadcast channel, and

the propagation delay between the two nodes is 245 bit times. Suppose A

and B send Ethernet frames at the same time, the frames collide, and then

A and B choose different values of K in the CSMA/CD algorithm. Assuming no other nodes are active, can the retransmissions from A and B collide? For

our purposes, it suffices to work out the following example. Suppose A and B

begin transmission at t = 0 bit times. They both detect collisions at t = 245 bit

times. Suppose KA = 0 and KB = 1. At what time does B schedule its retransmission?At what time does A begin transmission? (Note: The nodes must wait for an idle channel after returning to Step 2—see protocol.) At what time does

A’s signal reach B? Does B refrain from transmitting at its scheduled time?

In the above should we consider 32 bit or 48 bit jamming signal  and why?

With Regards,
Nikesh E S

[Upalparna Konar]

In my opinion it should be 48 bits, which is the maximum jam time.