C h a p t e r
2
Working Principle
Table of Contents
System Architecture ..........................................................15
Signal Flow .......................................................................16
Power Distribution .............................................................19
Ventilation and Heat-dissipation Principles ............................21
System Architecture
ZXSDR BS8800 is a forward-looking product of ZTE CDMA BSS
series. It adopts SDR platform and has the capability of mak- ing
smooth evolution to a future LTE network.
ZXSDR BS8800 is an indoor macro BTS. It consists of two parts:
baseband part (
BBU
) and RF part (
RSU
). For the conve- nience
of maintenance, ZXSDR BS8800 separates the two parts in
system architecture, with them interconnected via optical fiber.
Figure 9
shows the ZXSDR BS8800 system architecture.
F
IGURE
9 S
YSTEM
A
RCHITECTURE
In ZXSDR BS8800 , BBU takes charge of the processing of
baseband part while RSU the RF part. Their functions are described
as follows:
�
CC
is the main control module of BBU and even of ZXSDR
BS8800 .
It completes the conversion of
GPS
system
clock, the output of RF reference clock, the termination of Abis
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