User Manual

1 Overview
Base Station User Guide 9
Base Station Basic Description
The following is a simplified block diagram of the three-sector Base Station.
Sigma
Backbone Network
Quad
Downstream
Module
Hex
Upstream
Module
Up converter
Down converter
Diplexer To antenna
Up converter
Diplexer
To antenna
Diplexer
To antenna
S
x
x
x
Sigma
Monitoring
Modems
data
PA
PA
LNA
Down converter LNA
Up converter
PA
Down converter LNA
mgmt
C&F
Sharp IF
Filter Card
Figure 2: Three-Sector Base Station – Simplified Block Diagram
; Note: The Sharp IF Filter card is an optional card that filters out extraneous signals.
Without the Sharp IF Filter card, the connection between the Down converter and the
Hex Upstream Module is a straight wire.