User Manual

Architecture
Nortel Networks Confidential
3–58
PE/DCL/DD/0063
411–9001–063
Standard 12.07/EN September 2000
GSM/BSS V12
Power regulation function
Its main function is to check instantly the associated radio subset. It receives
configuration instruction via the AMNU unit. In this case, it launches processing
and returns reports.
Once that the function is configured, each TS in attendance on the FH bus is reading.
Next the function calculates the frequency and the power code to be applied to the
radio interface. Each function act a control of the set point (emission power), to
improve the non–linearity of the gain of the transmission chain.
It launches these main operations:
frequency hopping management
power slaving
transmission power
alarms management
RX logic function
The logic functions:
maintain:
• the interface between the SPU functions with respectively the RX radio
functions on the radio unit (e–LDRX)
• and the ciphering
filter the digital samples, provided by the RX radio functions, to base band
signals
generate the FH bus
Each RX radio functions processes the eight TS of the radio frame.
The main characteristics of the RX1 and RX2 radio functions are:
an interface for the reception of the GSM time to maintain the DSP
synchronization on the radio frame
for the transmission:
• the recording transmission parameters and the cyphering key
• the parameters cyphering and the transmission on the FH bus
for the reception:
• the recording of the reception parameters and the ciphering key
• the base band filtering of the digital samples provided by the converter
• the ciphering key moving
TX logic function
They maintain the interface between the SPU functions and respectively the TX
radio functions of the radio unit (e–LDRX).