COMBA CriticalPoint V3 7 BDA - Page 162

CRITICALPOINT 700/800MHZ BDA/DAS/BBU V3 USER MANUAL
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Rev. 1-0-2 Rev. Date: 11-1-2024
Page: 162
Table 20: Commissioning Fiber DAS – Power, Gain, Attenuation and AGC/ALC Controls
Parameter Name
MU
RU
DL Input ATT
Controls DL Input Attenuation for System
N/A
DL Gain Limit
Controls DL Gain Limit for System
N/A
DL_GAIN
Controls DL Gain for System
N/A
DL Output ATT
Controls DL Output ATT for MU only
Controls DL Output ATT for RU only
DL_TAR
CH TAR = MU DL_TAR – MU Output ATT
CH TAR = MU DL_TAR – RU Output ATT
DL Target Composite
Output Power
Controls DL Target Composite Output
Power for MU only
Controls DL Target Composite Output
Power for RU only
UL Input ATT
Controls UL Input ATT for MU only
Controls UL Input ATT for RU only
UL Gain Limit
Controls UL Gain Limit for MU only
Controls UL Gain Limit for RU only
UL_GAIN
Controls UL Gain for MU only
Controls UL Gain for RU only
UL Output ATT
Controls UL Output ATT for System
N/A
UL_TAR
Controls UL_Tar for MU only
Controls UL_Tar for RU only
UL Target Composite
Output Power
Controls UL Target Composite Power for
System
N/A
The DL Output ATT is used to set different output power on different devices.
Example:
DL_TAR at MU = 20dBm per filter
DL Output ATT at MU = 0dB
DL Output ATT at RU01 = 5dB,
Channel Output at MU= 20dBm
Channel Output at RU= 15dBm
The UL_TAR / UL_GAIN can be set differently at each device. However, they should be the same in most
cases. Use Batch Setting to set all devices parameters to the same UL_TAR / UL_GAIN. See section 3.29
for Batch Setting device parameters.
UL Output ATT in MU can be used to reduce the total output power and/or the broadband UL noise floor
which is generated by the UL Power Amplifier of the BDA/MU.
Fiber DAS Power, Gain, Attenuation, and AGC/ALC
The Fiber DAS follows the same rules as described in the BDA section above.
• DL_IN at MU: always indicates the channel power read from DT port, regardless of what the Gain
Limit or ATT settings in the system.
• DL_GAIN at MU: the gain that will be applied to the input.
• The expected DL_OUT at MU/RU can be calculated as: DL_OUT = DL_IN + DL_GAIN
And if DL_OUT > DL_TAR, system will limit DL_OUT = DL_TAR.
The Gain Limit / ATT / Target Output Power will affect the max value for gain and/or DL_TAR that users can
set.