User's Manual

Digital Repeater User Manual
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P
Output Power:
Output Power
P
input Power:
Input Power
V
ATT:
Attenuation value of attenuator
P
input Power
-V
ATT:
Input Power－Attenuation value of attenuator
P
max
: Rate output power
 Downlink gain setting
There are three factors to be followed to set DL gain of indoor repeater:
Meet with isolation requirement of G1= LISO-10dB。
The repeater’s gain shall be less than “Isolation I -10dB”, and if it allows, the gain shall be less than
“Isolation I -15dB”
Meet with UL noise Gnoise
The UL noise from the repeater shall be less than the thermal noise floor when reaching BTS tower.
The DL gain G2 shall be set so that the repeater can reach its full downlink output power
Finally to set the gain GDL= MIN（G1，Gnoise +8dB，G2）
UL Gain GUL= MIN（G1，Gnoise，G2）
Downlink gain setting procedures:
Use engineering mobile phone to test the input signal strength at the repeater’s BTS port, in order to get
the exact values of PBTS PORT BCCH (PCS)
The gain to meet the targeted output power
PCS system
Set G2=PDL MAX-PBTS PORT BCCH
The Downlink maximum gain GDL≤MIN (G2，Gnoise +8dB，LISO-10dB) , usually the value shall be the
equal value, but if the coverage size is not big, please reduce the gain to some degree.
“Gnoise +8dB” explanation: The downlink gain can be maximum 8dB higher than uplink gain in indoor
repeater solutions
The attenuation should be less than 30 dB when you set the downlink gain of the repeater and it would be
the best to attenuate less than 15dB range, and in case more than 15dB attenuation is needed, please use
external attenuator.
 Uplink gain setting
Standard: uplink attenuation values =downlink attenuation values
Remark: Keep in mind that you do not want to have more than a 5dB difference between the uplink and
downlink values for optimum system performance, and it is better to keep the same attenuation value of