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Consider the following statements:

S1: In ethernet, jamming signal ensure that all nodes using the channel are aware for their transmission(s) failed.

S2: Bit stuffing ensures that all frames are of the same size.

Which of the following is true?

(a) Only S1

(b) Only S2

© Both S1 and S2

(d) Neither S1 nor S2
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Solution says that only S1 is true. But according to me neither of them is true since jamming signal is used to ensure all the nodes using the channel are aware for the collisions happening in the channel due to other stations and not because of its own collision since if the frames of a station collides, then the owner stations (sender and reciever) gets to know about the collision by collision detection scheme. But in order for other stations to know about the collision that just happened in the channel which don't involve their frames, jamming signal needs to be sent.

This is the concept that I knew.

Am I going wrong somewhere?

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S1 is correct !

The purpose of jamming signal is, tell about collision happens to all the stations in the channel but not only for the involved stations, due to this reason, we will ensure that JAM signal also have to propagate the whole Channel.
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aware for their transmission(s) failed.

but why would stations that are involved in collision need to know about collision of their own frames through jamming signal?They have the collision detection scheme to detect collision right? jam signal is needed for other stations in the same channel right?

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jam signal is needed for other stations in the same channel right?

yes !

In ethernet, jamming signal ensure that all nodes using the channel are aware for their transmission(s) failed.

their means (in this context), only transmitting stations

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ok..got it now :) thanks

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