User's Manual

User Handbook L-RU Revision C
CONFIDENTIAL
PROPRIETARY
Reg. No.: User Handbook 1100182-C.DOC Page 12 of 29
3.1 Block Schematics of the Remote Unit
Figure 5 shows the functional block schematic of the remote unit, which basically identifies
the main building blocks and their interactions. All external interfaces are clearly identified
as arrows crossing the boundary of the remote unit.
E / O
PSU
Active
RF
Monitoring
DL
Optical Input
RF
Input / Output
Status LEDs
Power Supply
Legend:,
RF Connection
Optical Link
Pilot Tone
Monitoring Control
Module Power Supply
UL
Optical Output
Figure 5: Functional Block Schematic of the Remote Unit
• PSU: internal power supply for RU
• E/O: Optical transmitter and receiver integrated into one transceiver module
• Active RF: The combination of all passive and active modules for uplink and
downlink including supporting electronics
• Monitoring: All electronics for alarming.
The Remote Unit consists of the following functional building blocks
• The optical transceiver
• The pilot tone monitoring
• The downlink path
• The uplink path
• Duplexer
• Power supply