User's Manual

Configure the Host DARTs

FlexWave Prism Host, Remote and EMS 5.1 System Reference Page 155

When setting the

DART Reverse Gain

value, the following rules must be

observed:

n The

DART Reverse Gain

setting can be used to overcome losses from the Host

DART to the BTS. If you want unity reverse path gain and the losses to the

BTS are 20 dB, then the Reverse Gain should be set to 20 dB.

n If you want to match the URH noise floor to the BTS noise floor, then the

noise floors for both the URH and the BTS must be known. Use the

DART

Reverse Gain

to match these to optimize the reverse path. For example, if the

BTS has a noise floor of -114 dBm/30 kHz and the URH has a single Remote

noise floor of -124 dBm/30kHz, and there is 2 dB of loss from the Host

DART to the BTS, then the Reverse path gain should be set to 12 dB.

n Simulcast changes the actual REV gain level by 20log(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 4dB (10dB - 6dB). If REV

gain is set to 20dB in a 4:1 simulcast, the actual gain is 8dB (20dB - 12dB).

The Noise Floor of the URH goes up of 10*log10(n), where n = simulcast #.

For example, the single node Remote noise floor is -124 dBm/30kHz

(Before any Reverse path gain), then the noise floor for two remotes is -121

dBm, for 4 remotes it is -118 dBm/30kHz and for 8 remotes it is -115 dBm.

n Dual PCS uplink splitting causes a 3 dB degradation in the noise figure.

266 Click

Apply

and then