It is possible to use OpenMange Network Manager to discover the 3448 switchs. But only if the IP addresses on the switche were set. Another way to figure out the IPs would be to connect directly to the switch and use the CLI to find out what the addresses are. The User Guide has the info about how to connect and set the IP address - http://support.dell.com/support/edocs/network/pc34xx/en/ug/html/index.htm

Thanks - Todd