User's Manual

MobileAccessGX Installation and Configuration Guide 4
1.2.1 Signal Path
1.2.1.1 SISO Signal Path
On the DL, combined signals up to tri-band from the OCH converted into optical signals. Then
the optical signals are transmitted to the RU via optical fiber. The Optical TX/RX Module of RU
converts the DL optical signals into RF signals. After filtering signal for each band and
amplification, the signals are transmitted at the output port (700MHz/CELL850/PCS/AWS) to the
service antenna.
On the UL, the signals transmitted by the mobile are converted into optical signals, and then via
the UL optical fiber. The signals are transmitted to OCH, which then converts the optical signals
back to RF signals.
The optical DL and UL signal are transmitted in a single optical fiber based on WDM technique.
Figure 1-3. GX Functional Block Diagram – SISO Configuration
1.2.1.2 MIMO Signal Path
In MIMO system, the principle is similar to the single system. In MIMO, Dual-DL and dual-UL are
required, e.g. 700LTE / AWS. So two GX remote units are connected to the OCH. A pair of
optical fiber in same length is needed for the remote units to ensure the same time delay to both
units.
RF
Figure 1-4. GX Functional Block Diagram – MIMO Configuration
1.3 System Monitoring and Management
The MobileAccessGX Remote Unit is centrally managed via the MobileAccess SC-450 Controller.
Note that MobileAccessGX is not connected directly to the controller. It is connected to the FT-