Dell OptiPlex 990 (Early 2011) - Manual (Page 101)

Operating System Drivers
Within the operating system, AMT Unified driver must be installed to remove unknown devices in the Device Manager. Unlike
previous version 3, 4 or 5 (which used to have two separate HECI and LMS/SOL drivers from customer re-install stand-
point), they are both now in a common package called AMT Unified Driver. When the unified driver package is installed, it
will take care of both PCI devices in the Device Manager.
AMT Unified Driver
The Intel AMT Serial-Over-LAN (SOL) / Local Manageability Service (LMS) driver is available on support.dell.com and on the
ResourceCD under Chipset Drivers. The driver is labeled Intel AMT SOL/LMS. Install the driver by double-clicking on the
installer.
Once you install the SOL/LMS driver, the PCI Serial Port entry becomes the Intel Active Management Technology - SOL
(COM3) entry.
The Intel AMT Host Embedded Controller Interface (HECI) driver is available on support.dell.com and on the ResourceCD
under Chipset Drivers. The driver is labeled Intel AMT HECI. Install the driver by double-clicking on the installer.
Once you install the HECI drivers, the PCI Simple Communications Controller entry becomes the Intel Management
Engine Interface entry.