Hi,
I can't find a definitive statement as to exactly which MIBs are supported on the Catalyst 3560X, but according to the Catalyst 3560 MIB Support List and Catalyst 3560E MIB Support List they only support the ETHERLIKE-MIB as per RFC 1398. The support for the dot3PauseTable was not included within RFC 1398.
If you look at RFC 3635 Appendix 2 it shows that support for the dot3PauseTable was added between RFC 2358 and RFC 2665.
A.2. Changes between RFC 2358 and RFC 2665
[..]
(7) Two new tables, dot3ControlTable and dot3PauseTable, have been added.
[..]
Given that the latest IOS version for this platform is 15.0(2)SE2 I suspect the support for this platform is as per the other Catalyst 3560 platforms and therefore the dot3PauseTable is not supported.
Regards