User's Manual

Unit Descriptions - RF Path
P/N 709C011801
Page 34
2.1.2 OIU (Optical Interface Unit)
The OIU interfaces to the HEU, performs the RF to optic conversion of the received signal and distributes the wireless RF services
to the RAU units over the fiber optic infrastructure to the remote site. Each OIU supports up to 12 SM optic fibers (one fiber per
OIM), which are routed to up to 36 RAU (three Remote Antenna Units per OIM).
Figure 2-7. OIU Front Panel with Installed Modules
Module Description
ACM (Auxiliary Control
Module) (on page 34).
Auxiliary Control Module – interfaces with the HEU's HCM to provide
remote management capabilities.
PSM (Power Supply Modules) 110-230VAC. If two are installed, both must be powered on.
OIM (Optical Interface
Module) (on page 35)
Wideband, optical to RF (and vice versa) conversion units.
OIX (Expander Module (on
page 32))
Used to interface with the parallel Expander Unit on the HEU.
Table 2-6. OIU Front Panel Interface Definitions