Azhar. Buy a book! or use a search engine. This stuff is out there
Ethernet Frame Size.
64bytes*8bits/10M = 50uS
knock off a bit for 2 repeaters, e.g. 10uS per repeater = 30uS
x signal propagation (glass/copper = 2/3*c = 200000000m/s) = 6000m
/ 2 to get a return path
= 3000m for the max extended LAN
ATM Cell.
Arbitary. It's a compromise between data requiring large payloads and real time apps
requiring speedier delivery, i.e. small payloads (= smaller insertion delays). The
payload had to be a n*8bytes used by common voice compression techniques and ended up
at
48 (arbitary). The header was also arbitary and ended up at 5 bytes. When ANSI and
ITU
ratified the specs that was it.
azhar mumtaz wrote:
> Hello Guys:
> What i want to know is why there is a limit that ethernet frame size cannot be
> less than 64 bytes and more than 1526 bytes. I know that this is how ethernet
> should be understand but whats the logic behind it. Similarly why we are
> limiting cell size of ATM to 53 bytes.
> Regards
> Azhar Soomro
>
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