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gpakos
Joined: 04 Apr 2008
Posts: 7
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 07 May 2008 18:40 frame size |
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hello,
How we can determine the value of the minimum theoretical frame size on an ethernet network?
Lets say that the delay is 4usec and the speed of the network is 10Mbit/s, how it is possible to determine the minimum frame size?
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rooftile
Joined: 28 Apr 2008
Posts: 29
Helped: 2
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| 08 May 2008 10:37 Re: frame size |
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In theory, the minimum size of an Ethernet frame is 64 bytes and the maximum size of an Ethernet frame is 1518 bytes, and it does not depend on speed.
You could use a network analyzer (ethereal or wireshark) to get the real frame size since it can change.
I hope it can help you
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gpakos
Joined: 04 Apr 2008
Posts: 7
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| 08 May 2008 15:36 Re: frame size |
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Lets say that we have two stations, A and B connected with a 10Mbps link and the overall delay is 4usec.
In order for node A or node B to detect a collision in the link, the minimum frame size must be still 64 bytes?
Thank u for answering!
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rooftile
Joined: 28 Apr 2008
Posts: 29
Helped: 2
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| 08 May 2008 18:00 Re: frame size |
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To detect a collision in a link use this formula:
minimum frame size >= 2*(propagation delay)*BW
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gpakos
Joined: 04 Apr 2008
Posts: 7
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| 08 May 2008 19:13 Re: frame size |
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Yes, i think it now make sense! Thank you very much for your replies 
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