Ericsson CME 20 R6.1 - Functions

Radio Transmission
Combining System and Filtering, is the interface between transmitters
and the antenna system. The functionality is:
- Antenna system supervision support
- RF filtering
- Duplex filtering
The TX reference point is defined as the point where the TX antenna
signal crosses the RBS border, i.e. the connector for the antenna feeder.
P003052A
X=TX ref. point
RBS Border
Cabinet
Combining
system
+
Filtering
TX
TX
Figure 35 TX reference point
When the RBS is configured with integral antenna the TX reference
point is the cabinet output RF connector.
P003053A
X=TX ref. point
RBS Border
Cabinet
Combining
system
+
Filtering
TX
TX
Figure 36 TX reference point with integral antenna
20.3 Functions
20.3.1 Radio Transmission
Radio transmission denotes the function to "Generate an RF signal"
from the bit stream that constitutes a burst.
The transmitter uses the modulation format specified in /GSM:05.04/ for
GSM 900 and GSM 1800, and /PCS:4/ for GSM 1900.
The RF transmission characteristics are in compliance with
requirements in /GSM:05.05/ for GSM 900 and GSM 1800, and /
PCS:5/ for GSM 1900.
136 (306)
EN/LZT 123 2697 R5A
1998-08-13
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