128 tape drives in Backup Exec

Hi All

Does Backup Exec support 128 library tape drives?

I use Backup Exec 2010 R3 (all available updates installed), and it looks that Backup exec works only with 80 drives. All other drives 48 are reported as offline. They appear outside library as online stand alone drives. I also downoad trial 2012 version of Backup Exec and same issue. I tried 2 different libraries, and all what i can see in all cases, only 80 drives in a library are functional, rest of the drives are offline.

Regards