User's Manual

Corning Optical Communications DRAFT User Manual I CMA-XXX-AEN I Page 18
2 UNIT DESCRIPTIONS
2.1 Integrated Headend Unit (IHU) Description
The IHU is a compact unit which interfaces the RF sources (via RIMs), conditions the signals, performs the RF- to-optic
conversion of the received signal (via OIMs), and distributes the wireless RF services to the remote units over the fiber optic
infrastructure to the remote site. The IHU supports expansion connections to one additional IHU. Single source management is
provided by the HCM installed in one of the IHUs.
Figure 2-1 provides an example of an IHU with four RIM modules (for RF interface and conditioning), five OIU modules for RF to
optic conversion and routing to the fiber optic infrastructure, and three FMM modules (for topologies with campus connectivity).
The slots are color coded according to the type of modules that can be inserted in those slots:
• Red labeled slots – RIM slots
• Blue labeled slots – OIM slots
• White labeled slots – can host RIMs and OIMs
Note the following:
• The IHU also includes a preassembled cable management tray with routed ERFC cable (shown in inset) used for connecting
the RIX and OIX.
• The type and number of modules installed in an HEU chassis can vary according to the specific topology.
Figure 2-1. Example of IHU Front Panel with Installed Modules
The IHU performs the following main functions:
• Conditions (up to 8 including “Dual Slots”) RF sources to a level required for feeding to the OIMs.
• Enables the configuration of up to three RF service groups.
• Performs the RF-to-optic conversion of the RF services and forwards the services over the fiber optic infrastructure to the
remote site. Each OIU supports between 4-8 SM optic fibers.
For additional services or density, two IHU units can be cascaded, where both IHUs are managed from the headend control
module (HCM) installed in one of the units. The IHU installation procedure is detailed in Chapter 4.