InterReach Unison Installation, Operation, and Reference Manual
3-1
D-620003-0-20 Rev J
CONFIDENTIAL
SECTION 3
Unison Main Hub
The Main Hub distributes downlink RF signals from a base station, repeater, or
MetroReach Focus system to up to four Expansion Hubs, which in turn distribute the
signals to up to 32 Remote Access Units. The Main Hub also combines uplink signals
from the associated Expansion Hubs.
Figure 3-1
Main Hub in a Unison System
Figure 3-2 shows a detailed view of the major RF and optical functional blocks of the
Main Hub.
Figure 3-2
Main Hub Block Diagram
Unison Main Hub
Unison Expansion Hub
RAU
Downlink Path:
The Main Hub receives downlink RF signals from a base station, repeater, or MetroReach Focus system via
coaxial cable. It converts the signals to IF then to optical and sends them to up to four Expansion Hubs via fiber optic cable.
The Main Hub also sends OA&M communication to the Expansion Hubs via the fiber optic cable. The Expansion Hubs, in
turn, communicate the OA&M information to the RAUs via Cat-5/5E/6 cable.
Uplink Path:
The Main Hub receives uplink optical signals from up to four Expansion Hubs via fiber optic cables. It converts
the signals to IF then to RF and sends them to a base station, repeater, or MetroReach Focus system via coaxial cable.
The Main Hub also receives status information from the Expansion Hubs and all RAUs via the fiber optic cable.
Downlink to Main Hub
Uplink from Main Hub
Downlink from Main Hub
Uplink to Main Hub
