User Manual

ArchitectureNortel Networks Confidential 3–53
S8000/S8002/S8006 BTS Reference Manual
3.5.3 e–DRX functional description
This chapter describes the functional architecture of the e–DRX, but does not detail
each part. The aim is to give enough information to approach easily the main
features.
3.5.3.1 Logic unit (e–LDRX)
The logic unit (e–LDRX) contains (see Figure 3–16):
a FPGA unit which provides:
• a control and switching management function
• a time base function
• a synchronization function
a management unit (AMNU) which processes the following functions:
• start–up, downloading, initialization
• configuration
• monitoring
• LAPD break
• event reports
a transmission unit which provides:
• a radio signaling function
• a signal processing function
• a power regulation function
• a RX logic function
• a TX logic function
FPGA unit
Control and switching management function
Setting up communication with the BSC
When the BTS is activated, it must be connected to the BSC to work. A link is set
up on an external PCM link.
Downloading
When communications have been set up with the BSC, the BTS reports its status.
The BSC downloads, if necessary, the software to the BTS.