User's Manual

Table Of Contents
Introduction CMA-331-AEN Page 24
Draft
Acronyms
HEU = Headend Unit GEU-S = Gigabit Ethernet Unit-Standalone
RIM = Radio Interface Module ICU = Interconnect Unit Unit
RAU = Remote Access Unit IHU = Integrated Headend Unit
RxU = Remote Expansion Unit CEU = Centralized Ethernet Unit
GEM = Gigabit Ethernet Module OIU = Optical Interface Unit
RIM = Radio Interface Module OIM = Optical Interface Module
Table 1-18. Acronyms in System Architecture
1.3.6.1 RF Path
At the headend, RF signals from the RF signal sources (e.g. BTS/BDA) are conditioned by service specific (conditioner)
modules in the HEU (Headend Unit) and organized into (up to three) user configurable sectors. The conditioned RF signals are
converted to optic signals by the (wideband) OIU (Optic Interface Unit) and specific sectors are routed towards selected remote
locations according to user defined configurations.
The optic fibers at the OIU are routed to the ICU (Integrated Centralized Unit) at the remote end. From the ICU the optic fibers
are distributed along with DC to the Remote Access Units (RAU).
For small/medium size deployments an IHU (Integrated Headend Unit) can be installed at the headend. The IHU is a compact
headend unit that interfaces up to eight RF sources, conditions the signals and performs the RF to optic conversion of the
signals which are then routed towards the remote site.
Note: A fully occupied OIU (12 OIMs) supports up to 36 RAUs; Each IHU can support up to eight OIMs (with four RIMs)
supporting up to 24 RAUs.
Figure 1-3. ONESolution RF Path Architecture