Hello Iulian,
"wan-mz" means support for WAN modules. In addition, these are the unique features in
s72033-adventerprisek9_wan-mz.122-33.SXJ6.bin :
IPXWAN 2.0
IPX Access List Plain English Filters
IPX Access Control List Violation Logging
DLSw (RFC 1795)
BSTUN (Block Serial Tunneling)
DLSw+ Asynchronous TCP Enhancements
DLSw+ Border Peer Caching
LAN Network Manager over DLSw+
SRB - Source-Route bridging
HTH
Regards,
Imran