| Practical
network stratums |
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| n | OSI is seldom
realized as |
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| itself but
several layers are |
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| melted together
into stratums |
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| n | In this example
X.25 packet |
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| network operates
on ATM |
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| based SDH access stratums. |
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| n | ATM forms an
efficient |
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| info pipe where
no |
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| address checking
or |
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| error correction
is done |
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| but it is left
for |
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| lower layers |
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