User's Manual

Configure Host Reverse Gain
Page 88 FlexWave Prism Element Management System 7.1 User Manual
©
2011 ADC Telecommunications, Inc ADCP-77-177 • Issue 1 • July 2011
CONFIGURE HOST REVERSE GAIN
When setting the Reverse Gain value for the Host DART, the following rules must be
observed:
• The Reverse Gain setting can be used to overcome RF interfacing losses from the
Host DART to the BTS/BDA. If you want unity reverse path gain and the losses
to the BTS/BDA are 20 dB, then the Reverse Gain should be set to 20 dB.
• Simulcast changes the actual REV gain level by 10log(n) where n = the number
of simulcast links. For example, if REV gain is set to 10dB in a 2:1 simulcast
configuration, the actual REV gain is only 7dB (10dB - 3dB). If REV gain is set
to 20dB in a 4:1 simulcast, the actual gain is 14dB (20dB - 6dB).
Follow these steps to set the Reverse Gain value for the Host DART.
1 To access the Configure Host Reverse Gain page, in the System Menu bar, click
System Configuration > Configure Host Reverse Gain.
2 In the Host Parameters table DART list, select the Host DART that you want to
configure. The DART Name column is populated with the user-defined name for
the selected DART.
3 In the Reverse Gain Mode list, select the algorithm that should be used to add
attenuation for a simulcast group to prevent clipping because of too strong a
signal.
• Mode 1 (Noise Floor Matching)—optimizes the reverse path dynamic range
between simulcast nodes. For Prism/URU, the gains are reduced by
10*log10(N). This is the default for systems running Prism EMS 7.1.
• Mode 2 (Legacy Prism/URH)—reduces the gain by 20*log10(N). This is the
default setting for systems upgraded from 6.0.
4 Set the Additive Gain (dB) value to achieve the required gain from the input to the
Remote Unit to the output of the Host DART. The range is 0 to 31 dB.