User Manual

ArchitectureNortel Networks Confidential 3–1
S8000/S8002/S8006 BTS Reference Manual
3 ARCHITECTURE
3.1 Physical architecture
3.1.1 Introduction
This chapter provides an overview of the BTS physical architecture. BTS
components are described in detail in Chapters 1 to 5.
3.1.2 Subsystems
The BTS contains three main subsystems (see Figure 3–1 and Figure 3–2):
one BCF (Cabinet or Unit) or one CBCF Module
one TRX subsystem
one coupling system
The content of each subsystem is listed in Table 3–1.
3.1.3 Internal buses
The following buses, which connect BTS components, are described in this section:
Frequency hopping (FH) bus
Private PCM
GSM Time bus
Internal PCM bus
O&M bus
Note: The GSM Time bus, Internal PCM bus, and O&M bus are only used with
the BCF Unit.
Figure 3–1 shows the internal buses used with the BCF Unit and Figure 3–2
shows the buses used with the CBCF Module.