InterReach Unison Installation, Operation, and Reference Manual
4-1
D-620003-0-20 Rev J
CONFIDENTIAL
SECTION 4
Unison Expansion Hub
The Expansion Hub interfaces between the Main Hub and the Remote Access Unit(s)
by converting optical signals to electrical signals and vice versa. It also supplies con-
trol signals and DC power to operate the Remote Access Unit(s) as well as passes sta-
tus information from the RAUs to the Main Hub.
Figure 4-1
Expansion Hub in a Unison System
Figure 4-2
Expansion Hub Block Diagram
Unison Expansion Hub
Unison Main Hub
RAU
Downlink Path:
The Expansion Hub receives downlink optical signals from the Main Hub via fiber optic cable. It converts
the signals to electrical and sends them to up to eight Remote Access Units (RAUs) via Cat-5/5E/6 cables.
Also, the Expansion Hub receives configuration information from the Main Hub via the fiber optic cable and relays it to the
RAUs via the Cat-5/5E/6 cable.
Uplink Path:
The Expansion Hub receives uplink IF signals from up to eight RAUs via Cat-5/5E/6 cables. It converts the
signals to optical and sends them to a Main Hub via fiber optic cable.
Also, the Expansion Hub receives RAU status information via the Cat-5/5E/6 cable and sends it and its own status informa-
tion to the Main Hub via the fiber optic cable.
Downlink to Expansion Hub
Uplink from Expansion Hub
Downlink from Expansion Hub
Uplink to Expansion Hub
From
Main Hub
To RAU