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Andrew Wireless Innovations Group BCEL-FAST900 User Manual

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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