The model Types for UVM is in B and also check the link http://www.cisco.com/warp/public/74/157.html
A specifies the card type
Model Types:
B specifies the model designator, which specifies much of the capabilities a card has. For example, UVM model C (rev. A) has firmware DCA, while UVM model D (rev. A) has firmware DDA. Model C was the first UVM model that supported G.729 compression (among other new features). Model D supports everything that is supported by model C and adds Idle Code Compression (and other features) to the supported features.
C specifies the version level, which typically indicates the bug-fix level. The latest UVM firmware level used for this example is release E or DDE indicating UVM model D version E.
Also check this links for elaborate information on UVM cards - http://www.cisco.com/univercd/cc/td/doc/product/wanbu/igx8400/9_3_30/pg/igxpgcds.htm#76210
http://www.cisco.com/univercd/cc/td/doc/product/wanbu/igx8400/9_3_30/pg/igxpgvox.htm