Rate based flow control absent ?

Hi, I have been analyzing the various flow controls. I wonder why Rate based flow control are never used in Data Link Layer ? Why is feedback based flow control alone being promoted in Data Link Layer ?

I tried few links in internet, but they do not seem to convey the reasons for the absence of rate based flow control in Data Link Layer. Any ideas ?

Thx in advans, Karthik Balaguru

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Karthik Balaguru
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