[nsp] ATM encapsulations, which is best

[TMS]

Hello

I have connection to my ISP via ATM OC3c fiber optic link. Link
capacity is 10Mbps IP.

My ISP declared that "1Mbps IP = 1100 PCR in Kbps" (vbr-nrt as
ATM contract. Is this setting is correct ?

This ATM/AAL5 encapsulation is best for point-to-point ATM links ?
For now I using "aal5snap", but maybe "aal5mux ip" or "aal5ciscoppp"
is better for IP link ?
Is any good document which describes diffrences between ATM/aal5
encapsulations (aal5snap, aal5mux, aal5ciscoppp) ?

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TMS