User's Manual

Table Of Contents
Introduction
CMA-331-AEN
Page 25
Acronyms
HEU = Headend unit
RIM = Radio interface module
RAU5 = 5 Band remote access unit
GEM = Gigabit Ethernet module
RIM = Radio interface module
GEU-S = Gigabit Ethernet
Unit-Standalone
ICU = Interconnect unit
IHU = Integrated headend unit
CEU = Centralized Ethernet unit
OIU = Optical Interface unit
OIM = Optical Interface module
Table 1-19. Acronyms in System Architecture
1.4.1 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 headend unit (HEU) and organized into (up to three) user configurable sectors. The conditioned RF signals are
converted to optic signals by the (wideband) optic interface unit (OIU) and specific sectors are routed towards selected remote
locations according to user defined configurations.
The optic fibers at the OIU are routed to the integrated centralized unit (ICU) at the remote end. From the ICU the optic fibers are
distributed along with DC to the remote access units (RAU5).
For small/medium size deployments an integrated headend unit (IHU) 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.