(Here's that post I've tried to send a couple times...)
If you are asking for a reason, I may be able to break it down to a basic.
One of the reasons ATM uses a fixed cell size (53-bytes) is to make it a
little faster. Lets look at it through the OSI model. When data travels down
through the OSI there may be various size differences in different
technologies (ether, token, FDDI). This of coarse produces thinking on the
OSI's part as it flows down the layers. We all know thinking takes up some
time. Well, with ATM and the fixed size, the lower layers know what is gonna
come out every time so they don't have to rethink their strategies every time
a different packet is sent through because they always know how big it will
be (53-bytes). The less the thinking, the faster it can pass the info onto
the line. I know this is very weak but this is how I was taught it and I
think it helps to explain in Layman's terms.
Think of it like this. If UPS didn't have to weigh their packages every time
they sent it out in the trucks, just imagine how much faster it would get on
the road. Hope I helped...I think I just helped myself remember. ;)
Mark Zabludovsky ~ CCNA, CCDA, 1/4-NP
[EMAIL PROTECTED]
"If you need luck, apparently you're not prepared...Go study!"
~Mark Zabludovsky~
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