The PortServer II does not support any proprietary MIBs. (This is why there are not any listed on Digi International’s  Support web site).  It does support certain specific RFC based MIBs which you can find on the internet.

http://www.rfc-editor.org/rfcsearch.html.

The MIBs supported by the PortServerII listed in order by RFC # are:

 RFC# : Name

1213   : MIB-II

1658   : Character MIB

1659   : RS-232 MIB

1471   : PPP LCP MIB

1473   : PPP NCP MIB