Unit Descriptions - RF Path P/N 709C011801 Page 41
2.2 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 Access Units per OIM).
OIU hosts the following modules:
• ACM - Auxiliary Control Unit; provides interfaces for management of OIU modules via HCM (see section 2.2.1)
• OIM- Optical Interface Modules; converts the RF to three Optical links (see section 2.2.2)
• OIX- Optical Interface Expander; OIU to HEU interface Module (see section 2.2.3)
Note: For configurations with one OIX an ETM (Expander termination module) is required for terminating the unoccupied
OIX slot.
• PSM (AC/DC) - Power Supply Module; powers the unit (see section 2.1.1.5)
Figure 2-9. OIU Front Panel with Installed Modules
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