User's Manual

Advanced RF Technologies, Inc.
62
- If calculated composite HE DL input power exceeds the permitted maximum input range, then
additional attenuation will need to be added to the BCU input port so that the calculated HE DL
input power does not exceed 25dBm.
x The RFU DL input commission level is the combined DL Output ALC Level of the ADX-H-BCU which can be
obtained from the Control page of the ADX-H-BCU.
- The maximum input level of HE RFU will not exceed 10dBm (= 5dBm + 10*log10 (3)) because the
maximum output of BCU each path is limited to 5dBm by the ALC function.
7.2.2.1.2 Example of commissioning value calculation
7.2.2.1.2.1 AT&T signal in the PCS band with multiple technologies (without attenuation)
Table 7-3 shows 2 technologies being used by AT&T within the same band which are inputted into the HE RFU.
Table 7-3 Input signal conditions @HE RFU downlink input
WSP AT&T
Technology
GSM
WCDMA
Total input per band
20.0dBm
20.0dBm
HE Total Input 23.0dBm
x The downlink input level for each technology should be measured because two technologies (GSM & WCDMA)
are being used by AT&T in the PCS band.
- Total measured input power for GSM is 20dBm and for WCDM is 20dBm.
x The HE DL maximum input level for each technology can be calculated by adding the back-off value per
technology due to traffic load change (breathing).
x Estimated Total Max Input per band = Total input per band + back-off value per band for breathing.
x HE DL maximum input level becomes the sum of HE DL maximum input level for each technology.
- The sum of HE DL maximum input level for each technology is 28dBm (25.0dBm for GSM +
25.0dBm for WCDMA = 28.0dBm) and this value is 3dB (28dBm – 25dBm) larger than the
maximum DL input of HE RFU.
- If the calculated HE downlink commissioning value exceeds the maximum DL input of HE RFU,
attenuation will need to be added have the calculated HE downlink commissioning level not
exceed 25dBm.
Table 7-4 HE maximum downlink input level without 10dB attenuator
WSP AT&T
Total input per band 20.0dBm 20.0dBm
Back off per band for breathing 5.0dB 5.0dB
Estimated Total Max Input per band
25.0dBm
25.0dBm
Estimated Total Max Input
28.0dBm
Available Max Input
25.0dBm
7.2.2.1.2.2 AT&T signals in the PCS band with multiple technologies (with 10dB of attenuation)
After adding 10dB of attenuation to the system, the input levels per band and HE Total Input can be seen
below:
Table 7-5 HE downlink input signal conditions after adding 10dB attenuator to HE downlink input port
WSP AT&T
Technology
GSM
WCDMA