PowerVault 120T and Backup Exec 11d

Windows 2003 Server with all latest service packs We have a PowerVault 120T Autoloader and are trying to install it under Backup Exec 11d. The device appears under the Device Manager as a Tape Drive - SONY TSL-11000 SCSI Sequential Device. I have installed Backup Exec 11d and per Symantec, I am loading symantec drivers for Backup Exec. Unfortunately, the device comes up in BUE as DELL1 - seemingly a standalone tape drive. As well under the Device Manager - it appears under Tape Drives - there is no medium changer category or anything like that. How do I configure this device under BUE 11d? and/or how to get it to appear under the Device Manager as a Changer and not a stand alone tape drive. By the Way - I did update the firmware on this device to the latest that appeared on Dell's Support website.