Correction: V210/V240 as well as the V440 and new er Vxx5 (V215, V445, etc) series do support ssh with ALOM. Your system needs to have a firmware update up to 1.6. See the following link for more info.
http://docs.sun.com/source/819-2447-12/README_Other.html
Having said that someone in this thread posted that the V490/V890 does support this capability. I have recently installed RSC 2.2.3 with patch 119381-03 and I don't see where this is supported when running rscconfig or by doing a rscadm show. Can somebody point me to where the midrange server line shows on how to configure the RSC card with ssh support?