User Manual

MN021-01
Page 25 of 28
22. Appendix D – Power levels
Typical Output levels (dBm) at each TFA RF port versus different modulation scheme.
(NB: system gain is 0db, therefore the following values correspond also to min input levels)
Carriers CW GSM
900
GSM
1800
CDMA
800
CDMA
1800
Analog IDEN TDMA
800
TDMA
1900
1 +13.0 +19.0 +19.0 +15.5 +14.5 +19.0 +11.0 +19.0 +18.0
2 +10.0 +10.0 +10.0 +10.0 +10.0 +14.0 +8.0 +14.0 +13.0
3 +7.7 +7.7 +7.7 +5.0 +5.0 +12.0 +6.0 +12.0 +11.0
4 +6.7 +6.7 +6.7 +3.5 +3.5 +11.0 +4.5 +11.0 +10.0
23. Appendix E – Using external attenuator
The uplink step attenuator must be set to optimise the system performance dependent upon the
power into the BriteCell Fast TFLF local unit. The following table gives some examples:
Input Power External
Attenuation
TFLF Attenuation
setting
Uplink Gain
(TFAF+TFLF)
Downlink Gain
+37dBm 20 dB (5W) 0 dB +12 dB -20 dB
+33dBm 20 dB (2W) 0 dB +12 dB -20 dB
+24dBm 10 dB 10 dB +2 dB -10 dB
+20dBm 5 dB 5 dB -3 dB -5 dB
+14dBm 0 dB 20 dB -8 dB 0 dB
+13dBm 0 dB 20 dB -8 dB 0 dB
24. Appendix F – System Design Guidelines
24.1. Introduction
This Appendix is intended to describe the guidelines for the design development of the
BriteCell/BriteCell Fast System.
24.2. Project Definition
In order to allow the design development, it’s important to collect the right information. The input
parameters needed for the BriteCell coverage design are:
1. The type of standard: (GSM, CDMA, DCS, …);
2. The frequency: needed in order to choose the proper equipment and to evaluate the
path loss;
3. The number of carriers: important to define the input/output level of the equipment;
4. The BTS type: the link between BTSs and BriteCell coverage system can be Direct
Connection or Radio Connection, so it’s important to know which of these configuration
is used. The type of BTS is needed in order to properly set up the UL and DL variable
attenuators;
5. Definition of the coverage area based on the map: to define the number of radiating
points and their location, it’s important to consider:
- The kind of walls and floors
- The presence of false ceiling
- Eventual obstacles (architectural or furnishing)
- The required minimum receive level for mobile
- The power supply