3Com NBX 5.0 Site License (3C10502)\\nA per site license that permits the NBX system to upgrade to NBX R5.0 system software, available for NBX 100, NBX V3000, and SS3 NBX platforms. This license must be present or the NBX system will not allow moves, adds, and changes (MACs) to be performed.. This license is not required on new system purchases, as the license is embedded. License includes right-to-use licenses and keys for R4.2, R4.3, and R5.0.